115 / 1236
ENGINE
83
16.Also recheck run out of crank shaft.
17.Thoroughly clean crank shaft with kerosene. Use
wire brush for cleaning oil holes
NOTE
It is essential to recheck crank shaft for cracks and
balance after grinding.
18.Apply grease to all machined surfaces, if crank
shaft is to be stored. Crank shaft must always
be stored in vertical position.
19.Thoroughly clean main bearing caps and corre-
sponding machined surfaces of crankcase.
20.Install main bearing caps without bearing shells in
their respective positions on crankcase.
NOTE
Ensure that the serial numbers on crank case and
main bearing caps are matching. Also caps are in
order and notches forbearing shells are on same
side.
CYLINDER BLOCK
1.
Check cylinder block for cracks by pressure test-
ing method. Clean cylinder bores, bearing
surfaces, oil passages in crank case thoroughly.
Check water jackets for leakages by blowing air
at a pressure of 5 bar and then dipping the cylin-
der block in the hot water
(Temp of water 70°to
80°C)
NOTE
The block with any leakages / cracks should be dis-
carded.
2. Check crankcase mating surface with cylinder
head for unevenness with the help of straight
edge and feeler gauge. If necessary grind this
surface just to clear unevenness. Measure across
the length and also across the breath.
3. Ensure that the minimum height of crank case is
not less than the specified minimum height.