Group
21
Reconditioning engine
Cleaning, checking
Replacing piston or connecting rod
Operations
C20-29
C20
General
Pistons- connecting rods should only be disassembled
when replacing pistons/liners. Once a piston has been
removed it may not be used again. This is because the
piston is deformed when the gudgeon (piston) pin is
removed.
If a
connecting rod is to be removed, it is not necessary
to disassemble the piston-connecting rod since new
connecting rods and pistons must be used.
Liner- piston - gudgeon pin are supplied in matched sets
(six).
Connecting rods are supplied in kits of six. Note that all six
connecting rods must be replaced at the same time.
IMPORTANT B 27 E 1975
Engine types 498354 and 498356 up to and
incl.
engine no.
7630.
Exchange engine 1218098.
The above engines may be equipped with early type
crankshafts and connecting rods. Only parts of the same
type may be used together.
1
(Q)
(@)
5128 5129
Ttf
5092-1 5092-2 5092-3 5092-4 5092-5 5092-6
C21
Tools required to replace piston or connecting
rod
5092-1 Holder
5092-2 Connecting rod support for big end
5092-3 Drift to press out gudgeon pin, also used as
handle to press in pin
5092-4 Guide pin, used to press in gudgeon pin
Additional tools required for Demolin pistons:
5092-5 Piston support, used when pressing out
gud-
geon pin (with large bore)
5092-6 Piston support, used when pressing in
gud-
geon pin.
Additional tools required for
Mahle
pistons:
5128 Piston support, used when pressing outgud-
geon pin (with large bore)
5129 Piston support, used when pressing in
gud-
geon pin.
^3
d
Demolin
O
Mahle
C22
Make sure correct piston is installed
B 27 engines = Demolin or Mahle pistons.
B 28 engines = Mahle pistons.
32
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