SL L4-1.9L DOHC VIN 7 (1992)
Valve Guide Seal: Technical Service Bulletins
Engine - Oil Consumption/Driveability
NO.: 92-T-14B
DATE: January, 1995
GROUP: Engine
CORP. NO.: 286101R
SUBJECT:
Oil Consumption on DOHC Engines or Carbon Buildup on SOHC Engines (Replace Valve Seals)
Due to new procedures, this bulletin supercedes bulletin 92-T-14A, which should be discarded.
AFFECTED MODELS:
All 1991 and 1992 Saturns built before, and including VIN NZ241997 with SOHC (LKO) engines and VIN NZ237282 with DOHC (LLO) engines.
CONDITION:
The DOHC engine may have higher than normal oil consumption (0.95L [1 qt.] or more in 3218 km [2000 miles]). The SOHC engine may have a
stumble on deceleration or a misfiring cylinder while driving. Oil consumption may also be noticed on the SOHC engine.
CAUSE:
Valve stem seals may be worn, allowing oil to leak down the valve stem into the cylinder. On DOHC engines this condition will most likely lead to a
comment of higher than normal oil consumption. On SOHC engines, this condition may cause carbon buildup within the cylinders, resulting in various
driveability complaints such as miss or stumble.
CORRECTIVE ACTION:
On DOHC engines, perform an oil consumption verification test and replace all valve seals if required. On SOHC engines, verify operation of ignition
and engine control systems, remove carbon from valves and cylinders and replace all valve seals.
IMPORTANT:
For further information on oil consumption, refer to "Technical Information Bulletin 94-T-59."
PROCEDURE:
DOHC/SOHC ENGINES WHEN THE CONCERN IS HIGHER THAN NORMAL OIL CONSUMPTION
^
Check for external oil leakage.
^
Check fresh air hose and PCV valve for higher than normal oil pullover.
^
Verify oil consumption by performing an oil consumption test as follows:
1.
Change oil and oil filter (3.8 liters [4 quarts] of oil are required to properly fill the crankcase).
2.
Start engine and bring up to normal operating temperature 97° - 100°C (197° - 212°F).
3.
Park vehicle on level ground and wait a minimum of five minutes after engine is shut off. Check engine oil level, make sure it's at the FULL mark
on the dipstick.
4.
Mark dipstick with a scribe if not exactly at FULL mark.
5.
Record the vehicle's mileage, date of oil change and exact location of oil level on the Customer Service Order.
6.
Have the customer check the engine oil level at each fuel fill and return the vehicle if the oil level is at the "ADD" mark. If the oil level remains in
the cross-hatch area, have the customer continue operating the vehicle for a minimum of 3218 km (2000 miles) before returning the vehicle for
final oil consumption verification.
^
If the engine is using more than O.95L (1 qt.) per 3218 km (2000 miles), based on the oil consumption verification test, perform an engine cylinder
compression test as outlined in the "Engine Mechanical Service Manual."
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If engine cylinder compression is found to be within acceptable limits, replace all valve stem seals.
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If engine cylinder compression is found NOT to be within acceptable limits, perform the required repairs according to information in the