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Repair Instructions
Engine condition test
Compression test
Special tools 31/32/41/42/43 series: 999 6936
44/300 series: 885 257
A compression test indicating the cylinders and valve
sealing is carried out as a easy and reliable way of
judging engine condition.
• Run engine to operating temperature and shut it off.
• Dismantle all injectors and test cylinders in turn
and order.
IMPORTANT! Cleanliness is extremely impor-
tant, no dirt must get into the fuel system. Plug
terminals on disconnected injectors and fuel
lines.
Compression should be read off at normal starter
motor speed. A deviation of up to 10% below the fig-
ure given in the Workshop manual "Technical data"
is acceptable.
Low compression on all cylinders indicates worn cyl-
inder liners and piston rings. If by comparison one
cylinder deviates below it can depend on either un-
sealed valves, broken piston rings or a leaking cyl-
inder head gasket .
Install adapter 999 6936 (31/32/41/42/43) or 885 257
(44/300) in the injector outlets and secure with the in-
jector mounting nut.
Install a compression meter in the adapter and carry
out the compression test.
32
Removing components from
the Cylinder block
Removing
1
Remove the front cover (KA(M)D32/42/43/44/300)
2
Remove the compressor–turbocharger–air cleaner
airpipes. Remove the air cleaner. Remove the com-
pressor silencer (KA(M)D32/42/43/44/300)
3
Remove the tension pulley and remove the compres-
sor belt, 8 mm Allen key (KA(M)D32/42/43/44/300)
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