Cleaning Parts Of The Turbocharger; Checking Parts Of The Turbocharger; Assembling The Turbocharger; Bearing Housing - Valtra 6000 Workshop Manual

21. Engine

Cleaning parts of the turbocharger

N.B. Use conventional cleaning agents. Do not clean with cor-
rosive substances as parts of the turbocharger may be dam-
aged.
1. Wash off all dirt with a detergent solution. Use plastic tools
or brush when cleaning aluminium parts.
2. Clean all oilways with compressed air. Check that all contact
surfaces are clean and in good condition.

Checking parts of the turbocharger

1. Bearing housing

--- Inspect the bearing surfaces for damages and wear.
--- make sure that the turbine side sealing surface is undam-
aged.
2. Compressor wheel
--- check for bends, cracking or corrosion and possible wear
on the wheel rear face. Small faults can be accepted. Change
the wheel if damages affect balancing accuracy. Never bend
the vanes. Check the balancing accuracy (S1A, S1B: 0,21 gm
mm. S2B: 0,36 gm mm).
3. Shaft and turbine wheel unit
--- check the bearing point wear, min diameter is S1A, S1B:
7,615 mm. S2B: 10,15.
--- check the width of the sealing groove, S1A, S1B: max
1,630 mm. S2B: 1,58 mm.
--- measure the shaft ovality, S1A, S1B: max 0,005 mm. S2B:
0,007.
--- check balancing accuracy (S1A, S1B: 0,21 gm mm. S2B:
0,36 gm mm), change the part if given values are exceeded.
4. Compressor and turbine housing
--- check if there are damages, cracks or overheating faults
caused by wheel contact in the housings. Small damage can
be accepted, otherwise change the housing.
5. Turbine side rear plate
--- change the rear plate if it is bent or cracked.
6. Oil deflector ring
--- check the groove width on the sealing ring, S1A, S1B: max
1,226 mm. S2B: 1,58 Check also for other possible damage
and wear. Reject worn part.
7. Support flange
--- Check wear and cracking of the seal ring counter surface.
Only small wear can be accepted. In general, even a small
wear causes sealing problems.
1. 9. 1992
15. 5. 1993

Assembling the turbocharger

It is recommended to use a repair kit when assembling the
turbocharger. This kit includes necessary seals and parts
which are exposed to wear.
1. Fit the inner circlips into the bearing housing. Lubricate the
bearing points. Push the bearings into place and fit the outer
circlips.
2. Fit a new sealing ring into the groove and push the rear plate
onto the shaft against the turbine wheel.
3. Lubricate the shaft bearing points and the sealing ring.
Push the shaft into the bearing housing. Do not damage the
sealing ring.
4. Place the bearing housing vertically resting on the turbine
housing.
5. Fit the thrust sleeve into the thrust bearing and place the
parts into the bearing housing according to the position of the
guide pins. Place the oil deflector plate onto the thrust bear-
ing.
6. Fit a new o---ring into the groove of the support flange. Fit
a new o---ring onto the deflector ring. Press the deflector ring
into the middle of the support flange. Do not damage the seal-
ing ring and its counter surface.
7. Lubricate the o---ring and push the support flange into the
bearing housing. Fit the circlip the chamfered side outwards.
8. Push the compressor wheel onto the shaft. Tighten the shaft
nut to a torque correct torque. Secure the nut with locking fluid
Loctite 601.
9. Pass the compressor housing circlip over the bearing hous-
ing the circlip chamfered side towards the turbine housing.
Fit the o---ring into the groove on the bearing housing. Fit the
compressor housing according to the markings. Fit the circlip
into groove.
10. Fit the bearing housing and the turbine housing according
to the markings. Fit the fixing plate and tighten the screws to
22 Nm (S1A/S1B) or 17 Nm (S2B).
78
Model Code
6000-- 8750
216
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