M 07.20 Bumping Clearance - Hatz Diesel 1D30 S Workshop Manual

M 07.00 Cylinder head

M 07.20 Bumping clearance

–
General:
The bumping clearance has to be checked
and re-set after any replacement of a
cylinder, piston, conrod, crankshaft or
crankcase and with the engine cold.
Bumping clearance to small:
Damage to piston, cylinder head and
valves.
Bumping clearance to big:
Engine loses power and starting ability.
Preparations:
Ref.: M-Disassembly cross reference
scheme.
Settings:
– Put any of the gaskets and a depth
gauge on top of the cylinder and hold
cylinder firmly down.
When measuring put the depth gauge as
close as possible to the centre of the
piston or at least to the centre of the
gudgeon pin to avoid any incorrect read-
ings due to tilting of the piston.
– Crank engine until piston has passed
T.D.C. position.
– Read correct bumping clearance, by
using the correct thickness of gasket to
obtain the correct measurement S as
specified.
Use one gasket only !
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1D . . / 03.06