SERVICE MANUAL
B-41
The camshaft and the fuel pump gears are driven by crankshaft gear through an idler gear. All the gears are suitably marked
during production to facilitate re-timing. The marks being in line when no. 1 piston is at top dead center on its compression
stroke. The timing marks does not align at every rotation of the crankshaft where no. 1 piston is at TDC compression. It is
necessary to replace any of the timing gears, ensure that there is a backlash between 0.05 to 0.35 (wear-limit 0.9).
The timing or the resetting of the timing can be simply & quickly carried out with following instructions.
With the engine timing correctly set, the engine is turned until no.1 piston is at TDC on its compression stroke. In this position
align center punch marked on the gear with the center punch mark on camshaft, fuel pump and crankshaft gear respectively.
It should be noted that no adjustment is provided for valve timing. Provided the gear is correctly fitted.
VALVE TIMING DIAGRAM
o
1. IVO (intake Valve Open) 14 before TDC
o
2. IVC (intake Valve Close) 33 after BDC
o
3. EVO (Exhaust Valve open) 55 before BDC
o
4. EVC (Exhaust Valve close) 11 after TDC
VALVE TIMING -
I V O
E V C
I V C
E V O
o
14
o
33
o
55
o
11
TDC
BDC
ITL
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