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Page Hits: 4619114
NOTICE No: MT000000146
MODEL: Mazda MPV YEAR: 1989-1991
AFFECTED VINs: N/A
SUBJECT: Adjusting or installing cam belt procedure
APPLICABLE MODELS: 88-91 929, 89-91 MPV
DETAILS:

Vehicle has rough idle, lack of power on acceleration, or compression slightly lower than specification for cylinders in one bank.

When reassembling the engine after heads have been removed, the procedure for installing the cams to the pulleys may be unclear, which can result in installing the cam belts so the cams are off timing by one tooth or more.

Use a straight edge to align marks on the gear and cylinder head. (See Workshop Manual, Section B1, Assembly: Timing Belt.) Ensure that the slack in the belt is between the two cam pulleys, then install the top idler pulley. Never force auto tensioner.

When installing the cam pulleys use the following as a reference.

1990-91 DOHC:

  • Right Intake cam number 421 dowel must correspond with "B" on the pulley.
  • Right Exhaust cam number 441 dowel must correspond with "A" on the pulley.
  • Left Intake cam number 431 dowel must correspond with "B" on the pulley.
  • Left Exhaust cam number 451 dowel must correspond with "A" on the pulley.

1992 DOHC:

  • The camshaft pulleys are different for the right and left cylinder head.
  • The exhaust pulleys have a ridge on the outside edge that act as a timing belt guide.

NOTE: See Workshop Manual, Section B1, Assembly: Timing Belt

CONSUMER NOTICE:
The information and instructions in this notice are intended for use by skilled technicians. Mazda technicians utilize the proper tools/equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by "do-it-yourselfers." Consumers should not assume this notice applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies, consumers should contact their nearest authorized Mazda dealership.
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