Rattling Noise from Engine

VIN: JM1NB3539X0110592
Category: B Piston Engine
Symptom(s): 000 All Symptom Codes
Repair information reference #: 3102
Type Desc.: Bulletin
Svc bulletin: 1-010/99

A rattling noise may be heard from the engine when depressing the clutch or when revving the engine when in neutral. In extreme cases, customers may experience noise at all times. This concern can be caused by a improperly machined number 4 main cap of cylinder block which may result in premature wear of the thrust bearing.

Customers having this concern should have their vehicle inspected and repaired using the following procedure.

1. Verify customer concern.
2. Using a dial indicator measure, and record the crankshaft endplay.
   (See Service Bulletin for illustration) Rotate the crankshaft 180 degrees and again measure and record the endply.)
   • If end play is 0.3mm or more, proceed to STEP 3.
   • If end play is still less then 0.3mm, refer to the Workshop Manual further diagnostics.
3. Replace the applicable part per the workshop manual:
   • Protege - Short Engine
   • Miata - Partial Engine
4. Verify the repair

Note: Completely clean any reused parts.

Parts Information:

Copyright ©1999, Mazda Motor of America, Reprinted with permission.

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