DRIVETRAIN SYSTEMS UNIFORM INSPECTION GUIDELINES *
1988 Jeep Cherokee
GENERAL INFORMATION
Drivetrain/Transmission Motorist Assurance Program
Standards For Automotive Repair
All Makes and Models
INTRODUCTION TO MOTORIST ASSURANCE PROGRAM (MAP)
CONTENTS
OVERVIEW OF MOTORIST ASSURANCE PROGRAM OVERVIEW OF SERVICE REQUIREMENTS & SUGGESTIONS
Drive/Power Train Assemblies
AUTOMATIC TRANSMISSION/TRANSAXLE ASSEMBLIES DIFFERENTIAL AND FINAL DRIVE ASSEMBLIES MANUAL TRANSMISSION/TRANSAXLE ASSEMBLIES TRANSFER CASE ASSEMBLIES
Drive/Power Train Components
ACTUATORS (ELECTRICAL)
ACTUATORS (VACUUM)
AXLES
BEARINGS AND RACES
BELL CRANKS
BELL HOUSINGS
BUSHINGS (EXTERNAL)
CABLES (SPEEDOMETER)
CABLES (TV, DETENT AND SHIFT)
CARRIER BEARINGS
CLUTCH CABLES AND CABLE HOUSINGS
CLUTCH DISCS (MANUAL TRANSMISSION)
CLUTCH FORKS
CLUTCH LINKAGES (MECHANICAL)
CLUTCH MASTER CYLINDERS
CLUTCH PEDALS
CLUTCH PIVOTS
CLUTCH PRESSURE PLATES
CLUTCH RELEASE BEARINGS
CLUTCH SLAVE CYLINDERS (CONCENTRIC)
CLUTCH SLAVE CYLINDERS (CONVENTIONAL OR EXTERNAL)
COMPANION FLANGES
CONNECTORS
COOLER BYPASS VALVES
COOLER LINES
COOLERS
CV JOINTS
DIP STICK TUBES
DIP STICKS (FLUID LEVEL INDICATORS)
DOWEL PINS, GUIDES AND PILOT HOLES
DRIVE SHAFT FLANGES
DRIVE SHAFTS AND HALF SHAFTS
DUST BOOTS
ENGINE MOUNTS
EXCITER RINGS
FILLER TUBES
FILTERS AND SCREENS
FLANGES
FLEX PLATES
FLUID LEVEL INDICATORS
FLUIDS AND LUBRICANTS
FLYWHEELS
FORCE MOTORS
GUIDES
HALF SHAFTS
HOSES, LINES AND TUBES
HOUSINGS (BELL, CASE, TAIL (EXTENSION) AND AUXILIARY)
INTERMEDIATE SHAFT SUPPORT BEARINGS
KEY INTERLOCK SYSTEMS
LIMITED SLIPS
LINES
LINKAGES (EXTERNAL)
LOCKING HUB ASSEMBLIES
LOCKING HUB CONTROL KNOBS
LUBRICANTS
METAL-CLAD SEALS
METALASTIC JOINTS
MODULATOR PINS
MODULATORS
MOUNTS (ENGINE, TRANSAXLE AND TRANSMISSION)
ODOMETER DRIVES (MECHANICAL)
ODOMETER HEADS (MECHANICAL)
OIL PANS
PANS
PILOT HOLES
PRESSURE PLATES
PRESSURE SWITCHES
RACES
RUBBER JOINTS (METALASTIC)
SCREENS
SEALS
SEALS (METAL-CLAD)
SELECTOR INTERLOCK SYSTEMS
SERVOS
SHIFT INTERLOCK SYSTEMS (SELECTOR AND KEY INTERLOCK SYSTEMS)
SENSORS
SIDE COVERS
SLIP YOKES
SOLENOIDS
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)
SPEEDOMETER-DRIVEN GEAR HOUSINGS
SPEEDOMETER/ODOMETER DRIVES (MECHANICAL)
SPEEDOMETER/ODOMETER HEADS (MECHANICAL)
SPEEDOMETERS AND ODOMETERS (ELECTRONIC)
SWITCHES
TONE WHEELS
TOOTHED RINGS (TONE WHEELS)
TORQUE CONVERTERS
TRANSAXLE MOUNTS
TRANSDUCERS (TRANSMISSION)
TRANSMISSION COOLERS
TRANSMISSION MOUNTS
TRANSMISSION PANS
TRANSMISSION RANGE INDICATORS (PRNDL)
TUBES
UNIVERSAL JOINTS (CARDON OR CROSS TYPE)
VACUUM CONTROLS
VACUUM HOSES
VACUUM MOTORS
VACUUM-OPERATED SWITCHES
VEHICLE SPEED SENSORS
VENTS
VIBRATION DAMPERS
WHEEL ATTACHMENT HARDWARE
WHEEL SPEED SENSORS
WIRING HARNESSES AND CONNECTORS
YOKES AND SLIP YOKES
INTRODUCTION TO MOTORIST ASSURANCE PROGRAM (MAP)
OVERVIEW OF MOTORIST ASSURANCE PROGRAM
The Motorist Assurance Program is the consumer outreach effort of the Automotive Maintenance and Repair Association, Inc. (AMRA). Participation in the Motorist Assurance Program is drawn from retailers, suppliers, independent repair facilities, vehicle manufacturers and industry associations.
Our organization’s mission is to strengthen the relationship between the consumer and the auto repair industry. We produce materials that give motorists the information and encouragement to take greater responsibility for their vehicles-through proper, manufacturer-recommended, maintenance. We encourage participating service and repair shops (including franchisees and dealers) to adopt (1) a Pledge of Assurance to their Customers and (2) the Motorist Assurance Program Standards of Service. All participating service providers have agreed to subscribe to this Pledge and to adhere to the promulgated Standards of Service demonstrating to their customers that they are serious about customer satisfaction.
These Standards of Service require that an inspection of the vehicle’s (problem) system be made and the results communicated to the customer according to industry standards. Given that the industry did not have such standards, the Motorist Assurance Program successfully promulgated industry inspection communication standards in 1994-95 for the following systems: Exhaust, Brakes, ABS, Steering and Suspension, Engine Maintenance and Performance, HVAC, and Electrical Systems. Further, revisions to all of these inspection were recently published. Further, revisions to all of these inspection communication standards are continually republished. In addition to these, standards for Drive Train and Transmissions have recently been promulgated. Participating shops utilize these Uniform Inspection & Communication Standards as part of the inspection process and for communicating their findings to their customers.
The Motorist Assurance Program continues to work
cooperatively and proactively with government agencies and consumer groups toward solutions that both benefit the customer and are mutually acceptable to both regulators and industry. We maintain the belief that industry must retain control over how we conduct our business, and we must be viewed as part of the solution and not part of the problem. Meetings with state and other government officials (and their representatives), concerned with auto repair and/or consumer protection, are conducted. Feedback from these sessions is brought back to the association, and the program adjusted as needed.
To assure auto repair customers recourse if they were not satisfied with a repair transaction, the Motorist Assurance Program offers mediation and arbitration through MAP/BBB-CARE and other nonprofit organizations. MAP conducted pilot programs in twelve states before announcing the program nationally in October, 1998. During the pilots, participating repair shops demonstrated their adherence to the Pledge and Standards and agreed to follow the UICS in communicating the results of their inspection to their customers. To put some "teeth" in the program, an accreditation requirement for shops was initiated. The requirements are stringent, and a self-policing method
has been incorporated which includes the "mystery shopping" of outlets.
We welcome you to join us as we continue our outreach... with your support, both the automotive repair industry and your customers will reap the benefits. Please visit MAP at our Internet site www. motorist.org or contact us at:
1444 I Street, NW Suite 700
Washington, DC 20005
Phone (202) 712-9042 Fax (202) 216-9646 January 1999
MAP UNIFORM INSPECTION GENERAL GUIDELINES
OVERVIEW OF SERVICE REQUIREMENTS & SUGGESTIONS
It is MAP policy that all exhaust, brake, steering, suspension, wheel alignment, drive-line, engine performance and maintenance, and heating, ventilation and air conditioning, and electrical services be offered and performed under the standards and procedures specified in these sections.
Before any service is performed on a vehicle, an inspection of the appropriate system must be performed. The results of this inspection must be explained to the customer and documented on an inspection form. The condition of the vehicle and its components will indicate what services/part replacements may be "Required" or "Suggested". In addition, suggestions may be made to satisfy the requests expressed by the customer.
When a component is suggested or required to be repaired or replaced, the decision to repair or replace must be made in the customer’s best interest, and at his or her choice given the options available.
This section lists the various parts and conditions that indicate a required or suggested service or part replacement. Although this list is extensive, it is not fully inclusive. In addition to this list, a technician may make a suggestion. However, any suggestions must be based on substantial and informed experience, or the vehicle manufacturer’s recommended service interval and must be documented.
Some conditions indicate that service or part replacement is required because the part in question is no longer providing the function for which it is intended, does not meet a vehicle manufacturer’s design specification or is missing.
Example:
An exhaust pipe has corroded severely and has a hole
in it through which exhaust gases are leaking. Replacement
of the exhaust pipe in this case is required due to
functional failure.
Example:
A brake rotor has been worn to the point where it measures less than the vehicle manufacturer’s discard specifications. Replacement of the rotor is required because it does not meet design specifications.
Some conditions indicate that a service or part replacement is suggested because the part is close to the end of its useful life or addresses a customer’s need, convenience or request. If a customer’s vehicle has one of these conditions, the procedure may be only to suggest service.
Example:
An exhaust pipe is rusted, corroded or weak, but no leaks are present. In this case, the exhaust pipe has not failed. However, there is evidence that the pipe may need replacement in the near future. Replacement of the pipe may be suggested for the customer’s convenience in avoiding a future problem.
Example:
The customer desires improved ride and/or handling, but the vehicle’s shocks or struts have not failed. In this case, replacement may be suggested to satisfy the customer’s wishes. In this case, replacement of the shocks or struts may not be sold as a requirement.
A customer, of course, has the choice of whether or not a shop will service his or her vehicle. He or she may decide not to follow some of your suggestions. When a repair is required, a MAP shop must refuse partial service on that system if, in the judgment of the service provider, proceeding with the work could create or continue an unsafe condition. When a procedure states that required or suggested repair or replacement is recommended, the customer must be informed of the generally acceptable repair/replacement options whether or not performed by the shop.
When presenting suggested repairs to the customer, you must present the facts, allowing the customer to draw their own conclusions and make an informed decision about how to proceed.
The following reasons may be used for required and suggested services. These codes are shown in the "Code" column of the MAP Uniform Inspection & Communications Standards that follow:
Reasons to Require Repair or Replacement
A - Part no longer performs intended purpose
 - Part does not meet a design specification (regardless of
performance) Ñ - Part is missing
NOTE: When a repair is required, the shop must refuse partial service to the system in question, if the repair creates or continues an unsafe condition.
Reasons to Suggest Repair or Replacement
1 - Part is close to the end of its useful life (just above
discard specifications, or weak; failure likely to occur soon, etc.)
2 - To address a customer need, convenience, or request (to
stiffen ride, enhance performance, eliminate noise, etc.)
3 - To comply with maintenance recommended by the vehicle’s
Original Equipment Manufacturer (OEM)
4 - Technician’s recommendation based on substantial and
informed experience
NOTE: Suggested services are always optional. When presenting suggested repairs to the customer, you must present the facts, allowing the customer to draw their own conclusions and make an informed decision about how to proceed.
DRIVE/POWER TRAIN ASSEMBLIES
SERVICE PROCEDURES REQUIRED AND SUGGESTED FOR PROPER
VEHICLE OPERATION
NOTE: Whenever transmission or drivetrain service is performed that affects the suspension alignment, for example, removing the engine cradle, it is required that the alignment be checked and corrected if necessary.
AUTOMATIC TRANSMISSION/TRANSAXLE ASSEMBLIES
AUTOMATIC TRANSMISSION/TRANSAXLE ASSEMBLY INSPECTION
Condition Code Procedure Any internal component failure that requires removal of the assembly from the vehicle for service. (1) ........... A ........... (2) Require repair or replacement of the automatic transmission/transaxle assembly. (1) - It is Required that the torque converter and all other failure related components be inspected for cause and condition. (2) - For components not requiring removal of the assembly, refer to the component listing in this document.
DIFFERENTIAL AND FINAL DRIVE ASSEMBLIES
NOTE: Does not include half shafts.
DIFFERENTIAL AND FINAL DRIVE ASSEMBLY INSPECTION
Condition Code Procedure Any internal component failure that requires removal of the assembly from the vehicle for service. (1) ........... A ... Require repair or replacement of the differential assembly. (1) - For components not requiring removal of the assembly, refer to the component listing in this document.
MANUAL TRANSMISSION/TRANSAXLE ASSEMBLIES
MANUAL TRANSMISSION/TRANSAXLE ASSEMBLY INSPECTION
Condition Code Procedure Any internal component failure that requires removal of the assembly from the vehicle for service. (1) ........... A ... Require repair or replacement of the manual transmission/transaxle assembly. (1) - For components not requiring removal of the assembly, refer to the component listing in this document.
TRANSFER CASE ASSEMBLIES
TRANSFER CASE ASSEMBLY INSPECTION
Condition Code Procedure Any internal component failure that requires removal of the assembly from the vehicle for service. (1) ........... A ... Require repair or replacement of the transfer case differential assembly. (1) - For components not requiring removal of the assembly, refer to the component listing in this document.
DRIVE TRAIN/COMPONENTS
The conditions listed for the components included in this section assume that the problem has been isolated to the specific component through proper testing.
ACTUATORS (ELECTRICAL)
ACTUATOR (ELECTRICAL) INSPECTION
Condition Code Procedure Attaching hardware broken ................. A ... Require repair or replacement of hardware. Attaching hardware missing ................ C .......... Require replacement of hardware. Attaching hardware not functioning ............ A ... Require repair or replacement of hardware. Connector broken ........ A .. Require repair or replacement. Connector (Weatherpack type) leaking .......... A .. Require repair or replacement. Connector melted, affecting performance .. A ........... (1) Require repair or replacement. Connector melted, not affecting performance .. 2 ........... (1) Suggest repair or replacement. Connector missing ....... C ............ Require replacement. Inoperative ............. A ........ (2) Require replacement. Missing ................. C ............ Require replacement. Noisy ................... 2 .. Suggest repair or replacement. Out of adjustment ....... B .. Require repair or replacement. Terminal broken ......... A .. Require repair or replacement. Terminal burned, affecting performance ............ A ........... (1) Require repair or replacement. Terminal burned, not affecting performance .. 1 ........... (1) Suggest repair or replacement. Terminal corroded, affecting performance .. A .. Require repair or replacement. Terminal corroded, not affecting performance .. 1 .. Suggest repair or replacement. Terminal loose, affecting performance ............ B .. Require repair or replacement. Terminal loose, not affecting performance .. 1 .. Suggest repair or replacement. (1) - Determine cause and correct prior to repair or replacement of part. (2) - Inoperative includes intermittent operation or out of OEM specification.
ACTUATORS (VACUUM)
ACTUATOR (VACUUM) INSPECTION
Condition Code Procedure Attaching hardware broken ................. A ... Require repair or replacement of hardware. Attaching hardware missing ................ C .......... Require replacement of hardware. Attaching hardware not functioning ............ A .. Require repair or replacement of hardware. Connector broken ........ A .. Require repair or replacement. Connector (Weatherpack type) leaking .......... A .. Require repair or replacement. Connector melted, affecting performance .. A ........... (1) Require repair or replacement. Connector melted, not affecting performance .. 2 ........... (1) Suggest repair or replacement. Connector missing ....... C ............ Require replacement. Inoperative ............. A ........ (2) Require replacement. Leaking (vacuum) ........ A .. Require repair or replacement. Linkage bent, affecting performance ............ A ... Require repair or replacement of linkage. Linkage bent, not affecting performance .. 2 ... Suggest repair or replacement of linkage. Linkage binding, affecting performance ............ A ... Require repair or replacement of linkage. Linkage binding, not affecting performance .. 1 ... Suggest repair or replacement of linkage. Linkage broken A Require repair or replacement of linkage. Linkage loose, affecting performance ............ A ... Require repair or replacement of linkage. Linkage loose, not affecting performance .. 1 ... Suggest repair or replacement of linkage. Linkage missing ......... C ............ Require replacement. Linkage noisy ........... 2 .. Suggest repair or replacement. Missing ................. C ............ Require replacement. Noisy ................... 2 .. Suggest repair or replacement. Out of adjustment ....... A .. Require repair or replacement. Terminal burned, affecting performance ............ A ........... (1) Require repair or replacement. Terminal burned, not affecting performance .. 2 .. Suggest repair or replacement. Terminal corroded, affecting performance .. A .. Require repair or replacement. Terminal corroded, not affecting performance .. 2 .. Suggest repair or replacement. Terminal loose, affecting performance ............ B .. Require repair or replacement. Terminal loose, not affecting performance .. 1 .. Suggest repair or replacement. (1) - Determine cause and correct prior to repair or replacement of part. (2) - Inoperative includes intermittent operation or out of OEM specification.
AXLES
AXLE INSPECTION
Condition Code Procedure Bent .................... A ............ Require replacement. Broken .................. A ............ Require replacement. End play exceeds specifications ......... B .. Require repair or replacement. Flange bent ............. A ............ Require replacement. Flange threads stripped . A .. Require repair or replacement. Twisted ................. A ............ Require replacement. Worn, affecting performance ............ A ............ Require replacement.
BEARINGS AND RACES
NOTE: When replacing or repacking bearings, grease seal
replacement is required. You are not required to replace these components in axle sets. Determine the need to replace based upon the individual component conditions that follow.
BEARING AND RACE INSPECTION
Condition Code Procedure Bearing end-play exceeds specifications ......... B .. Require adjustment of bearing, if possible. If proper adjustment cannot be obtained, require replacement of bearing assembly. Bearing rollers, balls or races are worn, pitted, or feel rough when rotated as an assembly ............ B .. Require replacement of bearing assembly.
BELL CRANKS
BELL CRANK INSPECTION
Condition Code Procedure Attaching hardware broken ................. A ... Require repair or replacement of hardware. Attaching hardware missing ................ C .......... Require replacement of hardware. Attaching hardware not functioning ............ A ... Require repair or replacement of hardware. Bent .................... A .. Require repair or replacement. Broken .................. A .. Require repair or replacement. Cracked ................. A .. Require repair or replacement. Missing ................. C ............ Require replacement. Worn, affecting performance ............ A .. Require repair or replacement.
BELL HOUSINGS
See HOUSINGS (BELL, CASE, TAIL (EXTENSION) AND AUXILIARY) .
BUSHINGS (EXTERNAL)
BUSHING (EXTERNAL) INSPECTION
Condition Code Procedure Attaching hardware bent ................... B ... Require repair or replacement of bent part if available; otherwise, replace bushing. Attaching hardware broken ................. A ... Require replacement of broken part if available; otherwise, replace bushing. Attaching hardware corroded, affecting structural integrity ... A . Require replacement of corroded part if available; otherwise, replace bushing. Attaching hardware incorrect .............. A .......... Require replacement of incorrect part if available; otherwise, replace bushing. Attaching hardware loose .................. A ... Require repair or replacement of loose part if available; otherwise, replace bushing. Attaching hardware missing ................ C .. Require replacement of missing part if available; otherwise, replace bushing. Attaching hardware threads damaged ........ A ... Require repair or replacement of part with damaged threads if available; otherwise, replace bushing. Attaching hardware threads stripped (threads missing) ............... A ..... Require replacement of part with stripped threads if available; otherwise, replace bushing. Binding ................. A .. Require repair or replacement. Contaminated ............ 1 ............ Suggest replacement. Deteriorated, affecting performance ............ A .. Require repair or replacement. Distorted, affecting performance ............ A .. Require repair or replacement. Missing ................. A ............ Require replacement. Noisy ................... 2 .......... (1) Further inspection required. Rubber separating from internal metal sleeve on bonded bushing ......... A ............ Require replacement. Seized .................. A ............ Require replacement. Shifted (out of position) .............. B .. Require repair or replacement. Split ................... A ............ Require replacement. Surface cracking (weatherchecked) ............... .. ........ No service suggested or required. Worn, affecting performance ............ A .. Require repair or replacement. Worn close to the end of its useful life ........ 1 ............ Suggest replacement. (1) - If noise isolated to bushing, suggest repair or replacement. CAUTION: Use only approved lubricant on rubber bushings. Petroleum-based lubricants may damage rubber bushings.
CABLES (SPEEDOMETER)
CABLE (SPEEDOMETER) INSPECTION
Condition Code Procedure Attaching hardware broken ................. A ... Require repair or replacement of hardware. Attaching hardware missing ................ C .......... Require replacement of hardware. Attaching hardware not functioning ............ A ... Require repair or replacement of hardware. Bent .................... A .. Require repair or replacement. Binding ................. A .. Require repair or replacement. Bracket bent, affecting performance ............ A .. Require repair or replacement. Bracket bent, not affecting performance .. .. ........ No service suggested or required. Bracket broken, affecting performance ............ A ............ Require replacement. Bracket broken, not affecting performance .. .. ........ No service suggested or required. Bracket corroded, affecting performance .. A .. Require repair or replacement. Bracket corroded, not affecting performance .. 2 .. Suggest repair or replacement. Bracket cracked, affecting performance ............ A .. Require repair or replacement. Bracket cracked, not affecting performance .. 1 .. Suggest repair or replacement. Bracket loose, affecting performance ........... A .. Require repair or replacement. Bracket loose, not affecting performance .. 1 .. Suggest repair or replacement. Bracket missing ......... C ............ Require replacement. Broken .................. A ............ Require replacement. Cracked ................. A .. Require repair or replacement. Disconnected ............ A .. Require repair or replacement. Kinked .................. A .. Require repair or replacement. Melted .................. A ........... (1) Require repair or replacement. Missing ................. C ............ Require replacement. Noisy ................... 2 .. Suggest repair or replacement. Routed incorrectly ...... 2 ................. Suggest repair. Seized .................. A .. Require repair or replacement. (1) - Determine cause and correct prior to repair or replacement of part.
CABLES (TV, DETENT AND SHIFT)
CABLE (TV, DETENT AND SHIFT) INSPECTION
Condition Code Procedure Attaching hardware broken ................. A ... Require repair or replacement of hardware. Attaching hardware missing ................ C .......... Require replacement of hardware. Attaching hardware not functioning ............ A ... Require repair or replacement of hardware. Bent .................... A .. Require repair or replacement. Binding ................. A .. Require repair or replacement. Bracket bent, affecting performance ............ A .. Require repair or replacement. Bracket bent, not affecting performance .. .. ........ No service suggested or required. Bracket broken, affecting performance ............ A ............ Require replacement. Bracket broken, not affecting performance .. .. ........ No service suggested or required. Bracket corroded, affecting performance .. A .. Require repair or replacement. Bracket corroded, not affecting performance .. 2 .. Suggest repair or replacement. Bracket cracked, affecting performance ............ A .. Require repair or replacement. Bracket cracked, not affecting performance .. 1 .. Suggest repair or replacement. Bracket loose, affecting performance ............ A .. Require repair or replacement. Bracket loose, not affecting performance .. 1 .. Suggest repair or replacement. Bracket missing ......... C ............ Require replacement. Broken .................. A ............ Require replacement. Cracked ................. A .. Require repair or replacement. Disconnected ............ A .. Require repair or replacement. Frayed .................. A ............ Require replacement. Kinked .................. A .. Require repair or replacement. Melted .................. A ........... (1) Require repair or replacement. Missing ................. C ............ Require replacement. Noisy ................... 2 .. Suggest repair or replacement. Out of adjustment ....... B ........... (2) Require repair or replacement. Routed incorrectly ...... 2 ................. Suggest repair. Seized .................. A .. Require repair or replacement. Self-adjuster inoperative ............ A .. Require repair or replacement of self-adjuster. Threads damaged ......... A .. Require repair or replacement. Threads stripped (threads missing) ............... A ............ Require replacement. (1) - Determine cause and correct prior to repair or replacement of part. (2) - Cable replacement is required if it cannot be adjusted within specifications.
CARRIER BEARINGS
See INTERMEDIATE SHAFT SUPPORT BEARINGS.
CLUTCH CABLES AND CABLE HOUSINGS
CLUTCH CABLE AND CABLE HOUSING INSPECTION
Condition Code Procedure Broken .................. A ............ Require replacement. Cable bent .............. A ............ Require replacement. Cable binding ........... A .. Require repair or replacement. Cable mounting loose .... B .. Require repair or replacement. Cable out of adjustment . B .. Require repair or replacement. Frayed .................. B ............ Require replacement. Housing heat-damaged .... 1 ............ Suggest replacement. Missing ................. C ............ Require replacement. Noisy ................... 2 .. Suggest repair or replacement. Seized .................. A ............ Require replacement. Threads damaged ......... A .. Require repair or replacement. Threads stripped (threads missing) ............... A ............ Require replacement. Worn, affecting performance ............ A ............ Require replacement.
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