Maintenance - Timing Belt/Valve Clearance

BULLETIN NUMBER:
SB99-01-S002

ISSUE DATE:
SEPTEMBER 1999

GROUP:
ENGINE

MAINTENANCE SCHEDULE INFORMATION: TIMING BELT REPLACEMENT
INTERVAL AND DOHC V6 VALVE ADJUSTMENT SCHEDULE

TIMING BELT REPLACEMENT

AFFECTED VEHICLES

1998 Trooper (UX) / Rodeo (UE) / Amigo
(UA) models

SERVICE INFORMATION:

In the past, the timing belt replacement for the above affected vehicles has been recommended at every 75,000 mile intervals, regardless of driving condition. It is now recommended that the timing belt replacement interval of the above 1998 Isuzu models follow the same timing belt replacement interval as its 1999 model year successor. The new recommended timing belt replacement interval is 100,000 miles for normal vehicle use, and 75,000 miles for vehicles driven under Severe Driving Conditions.

NOTE:
If the vehicle is usually operated under the conditions corresponding to any severe driving conditions given below, it is recommended that maintenance services be performed at the interval listed under Severe Driving Conditions.

^ Towing a trailer, using a camper or car top carrier.

^ Repeated short trips of less than 8 km (5 miles) with outside temperature remaining below freezing.

^ Extensive idling and/or low speed driving for long distances, such as police, taxi or door-to-door delivery use.

^ Operating on dusty, rough, muddy or salt spread roads.

V6 VALVE ADJUSTMENT

AFFECTED VEHICLES

1998-2000 VehiCROSS (VX) / Trooper
(UX) / Rodeo (UE) / Amigo (UA) V6 models
with "direct-attack" valvetrain.

For the above affected vehicles, periodic 60,000 mile valve clearance inspections are not required. Adjust if valve noise is evident or a rough idle condition exists.

NOTE:
When checking valve clearances, adjustment is required only when the clearance (lash) is out of specification. Be sure to retorque the camshaft bearing cap bolts before checking and adjusting the valve clearance.