240 L4-2.3L SOHC VIN 88 B230F (1986)
M.Y 1985
M.Y 1986-
^
Extended periods of idling EVERY EVERY and/or low-speed operation 3,750 miles = 6,250 km 5,000 miles = 8,000
km
^
Frequent short trips, less OR EVERY 3 MONTHS OR EVERY 3 MONTHS than 7 miles or (11 km) WHICHEVER COMES
FIRST WHICHEVER COMES FIRST
^
Extended periods of driving in dusty and/or sandy areas
^
Trailer towing
^
Driving in mountainous areas
^
Primarily highway driving EVERY EVERY
^
Frequent trips of longer 3,750 miles = 6,250 km 5,000 miles = 8,000 km than 7 miles or (11 km) OR EVERY 6 MONTHS
OR EVERY 6 MONTHS
WHICHEVER COMES FIRST
WHICHEVER COMES FIRST
4.
Check if all other engine related turbo services have been performed and that the oil level is not below minimum.
B.Fault Tracing (Do Not Remove Turbo)
1.
Always start the fault tracing with a turbo charger quick check. Consult:
TP 31003 740/760 Operation K TP 30163 240 Operation M
2.
Excessive oil smoke in exhaust gases or oil film/residue on the inside of turbo unit are not evidence of a faulty turbo charger. First proceed
with turbo trouble shooting. Consult Service Manuals 740/760 and 240 Operation D.
Note:
Flame trap must not be installed in the turbo engine PCV Systems.
As an addendum to the fault tracing procedure, if the car is equipped with an intercooler, it must also be cleaned of excess oil. The lower left
intercooler tank has a drain plug for this procedure. If the drain plug is binding, the intercooler should be removed and drained.
3.
For information regarding problems such as turbo charger noise complaints, other engine noises and/or charge pressure, consult Service
Manual Turbo Trouble Shooting Operation D.
C.Replacement of Turbo Charger
If the fault tracing procedure has revealed that the turbo charger is defective and must be replaced, the following must be observed:
1.
Compare the maintenance record, accumulated mileage, and the actual condition of the turbo. If the vehicle has had scheduled
maintenance performed and a sludging condition exists, include copies of the servicing invoices for review when submitting the part to
Warranty Parts Testing. If a genuinely poor service record confirms actual inspection results, the repair may not be subject to warranty
consideration. Unusual situations with low accumulated mileage during the new vehicle warranty period should be reviewed with your
RSM.
2.
To determine if the lack of proper servicing is the cause, remove the turbo unit from the engine and thoroughly examine the inlet and
outlets ports in the center housing of the turbo unit.
3.
If you have found excessive axial and/or radial play in the turbo shaft and no evidence of sludge buildup in the lubrication system, hot
shut down is likely to be the reason for the bearing damage. Review the instructions given in the Owners Manual with the customer. See
turbo caution on next page.
NOTE:
- Abnormal radial play will cause the compressor wheel to touch the housing.
Turbo caution
Never race the engine immediately after starting. Oil flow may not reach some lubricating points fast enough to prevent engine damage. Before switching
off the engine,let it operate at idle for a short time to allow the spinning of the turbo-compressor's turbine vanes to slow. After hard driving, this idle time
should last a couple of minutes, during which the vanes will slow and the compressor will cool down while still receiving lubrication, If the turbine vanes
are spinning at high speeds when the engine is switched off, there is a great risk of heat damage and/or turbine seizure due to lack of lubrication. Do not
race the engine just prior to switching off!
4
To avoid repeat failures, follow the cleaning instructions of the oil delivery and
return lines carefully and fill the turbo charger bearing housing with engine oil. Do not use sealers when repairing the engine. If a sealant is used,
it may enter the lubrication system and restrict the oil lines to the turbo charger.
5.
A turbo replacement, because of bearing failure, must always be followed by oil and filter change.
D.Trouble Shooting Check List Form
