8
INFORMATION ABOUT OVERHAULING
EN 100
NOTE: During the positioning phase of reference X,
check that cylinder N° 1 is in compression phase
(intake and exhaust valves of cylinder N° 1 must be in
closing position).
Tab. 8.4 T
appets and t
appet housing size.
DIMENSIONS (mm)
CLEARANCE VALUE (mm)
0.060 - 0.105
8.4 Crankshaft
8.4.1 Dimensional check and overhauling
Wash the crankshaft thoroughly using suitable detergent.
Insert the pipe cleaner into all lubrication ducts B and blow compressed air to free them completely from
any dirt residues.
Check the state of wear and integrity of journals C and connecting rod D.
P
erform the operations described in Par. 9.3.1, perform the operations described in Par. 9.3.6 - except
Points 2, 4, 9 and 10.
Measure the crank pins A1 with a micrometer, and using a dial gauge measure the internal diameter of the
connecting rod half-bearings A2.
Measure the main journals B1, with a micrometer, and using a dial gauge measure the internal diameter of
the crankshaft half-bearings B2.
If the values described in Tab. 8.5 do not correspond, proceed with grinding all gudgeon pins A1 and B1.
G
ear A on the crankshaft is timed by a key, assembly of gear A on the shaft occurs after heating at a
stabilized temperature of +180° C for 5 mins.
F
ig 8.9
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