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Workshop manual RR 4T - 400 - 450 - 525
– Position the timing chain separating tool and undo the chain
(see figure).
– ENSURE THAT THE EJECTED NAILS DO NOT FALL
INTO THE ENGINE.
– HOLD THE TIMING CHAIN IN POSITION SO THAT IT
DOES NOT FALL DOWN TOWARDS THE CHAIN CASING.
– REMOVE THE OPEN CHAIN LINK AND REPLACE IT WITH
A NEW ONE.
Any link of the timing chain can be opened.
– To prevent the timing chain from falling down to the chain cas-
ing, insert a wire clamp into each chain end.
– Remove the camshaft from the cylinder head.
– Remove the three screws 1.
NOTE:
– There is no need to remove these three screws if the cylinder
and the cylinder head require no servicing. The cylinder and
the cylinder head can be removed together without having to
replace the cylinder head gasket.
– The screw on the timing chain side is fitted with a copper seal
ring (6x10x1).
When refitting the parts, replace the copper washer with
a new one.
– Remove the four cylinder head screws 2 with the related
washers and remove the cylinder head together with the gas-
ket.
– Pull up the cylinder while holding the piston in position.
1
1
2
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