Volvo DH10A 245 Service Manual page 123

– Observe due care when removing the compressor
housing/turbine housing not to damage the blades
on the wheels.
– The lock nut on the compressor wheel (6) has a l-h
thread.
– Line-up mark the position of the axial bearing and
the oil guide plate.
122
Cleaning
Corossive cleaners can damage certain parts and
should therefore be avoided.
Make sure all surfaces adjacent to the wheels and hous-
ings are free from deposits and are clean and smooth.
Allow the parts to seep in a cleaner until the deposits
drop off.
Use a plastic scraper or soft brush on the aluminium
parts.
Note: A steel brush or metal scraper must never be
used. Steam can be used on condition that shafts and
other bearing surfaces are not damaged.
Blow all parts clean with pressurized air; check par-
ticularly to make sure that all drillings and slide sur-
faces are free from dirt.
Checking
Check all parts for wear. Bearings, seals, lock rings and
circlips requiring replacement should be replaced with
the corresponding parts from the repair kit.
A damaged shaft with scoring on the bearing surfaces
must not be re-fitted. Minor scores are acceptable.
If damaged, the turbine and compressor wheels must
always be replaced. Do not attempt to straighten out a
deformed blade. The housing is replaced if it is cracked
or been exposed to overheating.
Very often the better alternative is to replace the entire
compressor (exchange unit) if, e.g., the shaft, housing
or some blades are damaged.
For DH10, 245, 285
Check to make sure the wastegate pressure box is not
leaking air.
NOTE! Max. test pressure 155 kPa (1.55 kp/cm
With leakage, replace the pressure box.
2
).