Operation Manual

Job Card No..:
Engine:
Filing No.:
Valve Timing
Checking
0178-10-10 1113
Checking
Check inlet/exhaust valve timing.
A timing check is required following camshaft
fitment (Job Card 04.06.01) and when inspec-
ting or working on the timing gears.
Job:
Check valve clearance (Job Card 01.01.01). Turn crankshaft in the normal running direction until the valve
drive of No. A1/1 and B1/7 or 9 cylinders have frictional contact so inlet/exhaust pushrods are heavy to turn.In
this position mark flywheel to agree with the fixed pointer on the crankcase. From this mark to the TDC mark
of No. 1 cylinder (in-line engines) or No. A1/B1 cylinder (V-type engines) measure distance "b" on flywheel
periphery and flywheel diameter.
α =
360 x b
d x π
where b = distance on periphery and d = diameter.
The value obtained for must conform to the timing data (Section 3.3.1) within + 4° crank angle, otherwise
inspect upper and lower valve drives (Job Card 04.02.01) and timing gears (Job Card 04.08.01).
04.06.02
S/BVM 628
Tools:
- Standard tools
- Tape rule