Valve Recession; Radial Play Of Valves; Valve Guide Replacement; M 07.40 Valves, Valve Guides And - Hatz Diesel 1D30 S Workshop Manual

M 07.00 Cylinder head
M 07.40 Valves, valve guides and valve seats
- 6 -
Dismantling:
– Remove valve collets, spring cup, valve
spring, spring retainer and valve stem
seal cap if fitted.
For removal use tool - 6 -
Inspection / repair:
– Check all parts in question for wear or
any other damage like cyl.-head cracks
etc. especially for the following condi-
tions:

Valve recession

– After re-installing the valves check the
valve recession as specified.
Whenever the recession is close, or
slightly above the limits, the bumping
clearance should be adjusted to the
minimum tolerance to at least partly
compensate for the loss of compression
ratio.

Radial play of valves

– Lift valves approximately 10 mm off its
seat.
– Measure and compare dimensions with
dimensions „k" as specified.
If these figures are exceeded, the valves
as well as the valve guides have to be
checked separately and/or replaced in
case the dimensions „h" as specified are
exceeded.

Valve guide replacement

If possible warm cyl.-head up to approxi-
mately 80°C / 175°F.
– Remove (press out) worn valve guides.
– Fit new valve guides.
Ensure correct protrusion „h" as specified !
– Finish - ream valve guide bore.
3
1D . . / 03.06
Assembly:
– Assemble in reverse sequence valve
stem seal cap, spring retainer, valve
spring, spring cup and valve collets.
For assembly use tools - 6 -
Ensure proper seating of valve collets !
NOTE:
Valve guides with collar require automati-
cally valve stem seal caps.