Cylinder Head Cover - Installation Precautions

BULLETIN NUMBER
SB94-01-003

ISSUE DATE
DECEMBER 1994

GROUP
ENGINE

TROOPER (UX) AND RODEO (UC) CYLINDER HEAD COVER DAMAGE

AFFECTED VEHICLES

Trooper (UX) and Rodeo (UC) models equipped with 6VDl engine.

SERVICE INFORMATION





When reinstalling cylinder head covers on affected vehicles, care must be taken to ensure that the head cover bolts are properly tightened. Use only a good quality torque wrench and tighten only to the specifications listed in the appropriate Workshop Manual. Do not use air impact wrenches to tighten cylinder head cover bolts. Air wrenches tighten the bolt until the corner tab on the cylinder head cover either cracks or breaks (Figure 1). Once the tab is damaged, an oil leak will result. This damage can be incorrectly diagnosed as a leaking head gasket or a rear main oil seal. Cracked or broken cylinder head covers due to over tightening are not covered under warranty.