Yaroslavl Engine Plant YMZ-536 Operation Manual page 136

5. Place the piston of the 1st cylinder at the top dead centre (TDC) of
the compression stroke by turning the crankshaft with the turning
gear in the clockwise direction (if looking from the fan side) using
one of the two methods described below:
METHOD 1:
below the crankshaft turning gear hole. Turn the crankshaft until you
can see figure «1» on the flywheel outer diameter. At this point the
pistons of cylinder 1 and cylinder 4 will be at their TDC. One piston
will be at the compression stroke TDC (the pushrods of the intake and
exhaust valves can be turned easily by hand), the other will be at the
exhaust stroke TDC. If the pushrods of the 1
and will not turn, turn the crankshaft one revolution (360
3
Fig. 45. Plugs on the flywheel housing
1– flywheel housing; 2– plug; 3– plug
METHOD 2:
valves are completely lifted (closed). Turn the crankshaft an additional
135 (90+45) degrees. This crankshaft position corresponds to the
compression stroke in the 1
exhaust valves are closed and the pushrods can be turned easily by
hand.
136
Remove plug 3 of the inspection hole located
Turn the crankshaft until the 1
st
cylinder. At this point both the intake and
st
cylinder are clutched
о
).
1
2
st
cylinder intake