Tappet Clearance Table; M 07.00 Cylinder Head; M 07.10 Rockers And Decompression Device - Hatz Diesel 1D30 S Workshop Manual

M 07.00 Cylinder head

M 07.10 Rockers and decompression device

–
General:
The decompression device works due to
the fact that the rocker for the exhaust
valve is eccentrically supported on the
rocker shaft.
The axial fixation of the rocker shaft is exe-
cuted as follows:
1 D 60 - 80 - 81
by a spring loaded pin (A)
1 D 30 - 31 - 35 - 40 - 41 - 50
by washers and circlips (B).
The radial fixation of the rocker shaft is ex-
ecuted due to an adjustable spring loaded
ball stop.
Dismantling:
– Set the engine to T.D.C. firing stroke i.e.
both valves closed.
– Unscrew set-screw 1 approx. 3 turns.
Remove complete unit 1 only if neces-
sary.
– Remove 2 (A) or 3 (B) (washers during
dismantling of rocker shaft) dependant
upon type of engine.
– Remove in numerical sequence 4...5.
– Dismantle rocker arm 5 in numerical se-
quence 6...10.
Pin 11 remains as part of rocker arm.
Inspection / repair:
– Check all parts, especially the ratchet
system, for function, wear or any other
damage. Ensure proper function of snap
in and releasing of catch 7 and holding
spring 9.
Assembly:
– Pre-assemble rocker arm 5 in reverse
sequence 10...6.
– Place rocker arms 5.
– Insert rocker shaft 4
3
1D . . / 03.06
– Place 2 (A) or 3 (B) (washers during as-
sembling of rocker shaft) dependant
upon type of engine.
– Screw set-screw 1 firmly in until locked.
Ensure correct positioning of ball lock in
rocker shaft
– Unscrew set-screw 1 180° and check the
system for free, but not loose movement.
– Adjust tappet clearance and check de-
compression device for function.
NOTE:
The ratchet wheels 8 are different and are
fitted as follows:
8 ratchet wheel - standard engine as from
the start of production.
5 ratchet wheel - since middle of 1992,
1 ratchet wheel - engines equipped with
recoil or rope start.
1D31 / 41 from Serial 13, 1D50,
1D60 from Serial 21,
1D81 from Serial 14 und 1D90:
The rocker shaft and cylinder head were
modified. The new rocker shafts (with one
O-ring only) do not fit in the old versions
and vice versa.
1D60 / 81 / 90: axial fixation was modified
from former spring-loaded-pin to a hollow
pin acting as an oil pressure throttle same
time.
Tappet clearance:
Type Inlet
(mm)
1D30 - 81 0.1+0.05
1D41 0.2+0.05
1D90 0.3+0.05
Outlet
(mm)
0.2+0.05
0.2+0.05
0.3+0.05