Group 21 Service procedures - engine
39
Cylinder liners and pistons,
removing
Special tools: 999 1801, 999 2529, 998 3590, 999 6394, 999
6395, 999 6645, 999 6963, 999 6966
1
Remove the pan and the cylinder head(s).
If the cylinder liner is to remain on the engine when the pis-
tons are removed, the holders 999 6966 must be fitted so
that the liner is not moved out of position. If the liner should
glide up during removal of the piston then the liner should
also be removed, since there is considerable risk that impuri-
ties will fall down between liner and block and cause leak-
age.
2
Remove the plug in the flywheel housing and fit cranking
tool 3590. Turn the crankshaft so that the piston for the ac-
tual cylinder is at BDC.
4
Remove the big end cap. Tap up the connecting rod, with for
example the handle of a hammer, so that the piston rings are
released from the cylinder liner. Lift off the piston and con-
necting rod.
Note: Scrape off the soot edge on the upper part of the cylin-
der liner to simplify removal of the piston and connecting rod.
5
Mark the piston and liner before removing, to make sure
that the same piston and liner are refitted in the same
place as before.
Remove the cylinder liner with extractor 999 6645, sup-
port 999 6394 and 999 6395, and extractor plate 999
6963.
6
Remove the circlips for the gudgeon pin.
7
Tap out the gudgeon pin carefully with drift 999 and han-
dle 999 1801.
8
Remove the piston rings with a piston ring tool.
Remove the piston cooling nozzle for the cylinder in ques-
tion.
3
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