Hombre XS Space Cab L4-2.2L CPC (1997)
Crankshaft Main Bearing: Technical Service Bulletins
Engine - Preventing Premature Main Bearing Failures
BULLETIN NUMBER:
SB98-O1-LOO8
ISSUE DATE:
JULY 1998
GROUP:
ENGINE
AFFECTED VEHICLES
1997-98 HOMBRE (TH) PREVENTING PREMATURE
MAIN BEARING FAILURE
SERVICE INFORMATION
Condition:
There have been several reports of some 4.3L V6 engines experiencing main bearing failure. In most of these cases, this condition has occurred soon
after an inlet manifold Removal & Replacement procedure.
Possible Cause:
Excessive tightening torque to the inlet manifold bolts, affecting crankshaft main bearing clearances.
Correction:
During the reinstallation of the inlet manifold, refer to the Workshop Manual for correct service procedures.
NOTE:
If the inlet manifold attaching bolt torque and tightening sequence specified in the Workshop Manual are not strictly adhered to, crankshaft main
bearing bore alignment can be distorted with crankshaft main bearing failure being the end result.
SERVICE PROCEDURE:
Refer to the published Workshop Manual Section: Engine Mechanical - 4.3L, "Intake Manifold Installation (lower)" for detailed service procedures.
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Always follow the proper bolt tightening sequence for each of the THREE torque steps.
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Do not exceed the specified tightening torque of each step.
