Engine Valve Train - Ticking Noise: Overview

BULLETIN NUMBER:
SB00-01-S009

ISSUE DATE:
SEPTEMBER 2000

GROUP:
ENGINE

TICKING SOUND FROM HYDRAULIC VALVETRAIN
(Supersedes SB00-01-S002)

NOTE:
This service bulletin is being revised to update parts information.

AFFECTED VEHICLES

Some 1997 and earlier Trooper (UX) and Rodeo (UC) V6 models

SERVICE INFORMATION

Condition:
The above affected vehicles may exhibit a condition of ticking sounds coming from the valvetrain during normal operation.

Possible Cause:
One or more hydraulic lash adjusters do not fully extend due to varnish build-up inside. This condition results from exceeding the required oil and filter change intervals. Severe driving conditions require more frequent oil and filter changes. (Refer to appropriate Owner's Manual or Workshop Manual for details.)

Correction:
A typical repair for the condition may involve the replacement of the affected rocker arm(s), and rocker shaft(s). However, follow the information in this bulletin to perform an oil/filter change using 0W-30 Mobil 1 synthetic engine oil, prior to replacing any valvetrain component.

NOTE:
Although the current recommended engine oil for these engines is 10W-30 API SJ, the 0W-30 synthetic engine oil allows air in the hydraulic lash adjusters to bleed out quickly and removes the varnish that is preventing hydraulic lash adjuster piston travel.





PARTS INFORMATION

WARRANTY CLAIM INFORMATION

None: This is not a warranty matter (see POSSIBLE CAUSE).