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1.05L REVOTORQ ENGINE
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8. Butt clearance of piston ring should be
measured in unworn portion of cylinder bore
9. In case of any piston ring with any one of this
defect, complete ring set should be replaced.
10.When cylinder bores are re-bored or honed,
pistons and rings of appropriate size should be
used. Piston size grade is stamped on piston
crown.
11.Install piston rings in their respective position
on piston using ring expander.
12.Stagger piston rings gaps such that they are
120°apart (with butt gap not in line with piston
pin)
Crank Shaft :
Clean and carry out visual inspection of crank
shaft for the following:
1. Overheating of journals, this is indicated by
bluish brown colour.
2. Scoring marks on journals
3. Cracks, which should be checked on magnetic
crack detector
4. Check crank shaft run out by supporting it on
V-block at 1st and 3rd main bearing journals.
5. If run out exceeds permissible limits, straighten
crank shaft in cold condition on press carefully.
6. Similarly check lateral and radial run outs of
flywheel mounting flange.
7. Check crank shaft main bearing and crank pin
journal dimension.
8. Record the readings in the format given at the
end of this group.
9. If necessary, grind crank shaft main bearing
and crank pin journals to next under-size.
10.Maintain correct fillet radius for journals
11.Care must be taken during grinding to ensure
that width of journals is not increased.
12.Should it be necessary to grind sides of 4th
main bearing journal, grind it to next undersize.
13.Re-chamfer oil holes on journals to avoid
scoring of new bearing shells.
14.Finish journals by lapping them with 320 grit
lapping cloth of suitable width.
15.After grinding recheck main bearing and crank
pin journal dimensions.
16.Also recheck run out of crank shaft.
17.Thoroughly clean crank shaft with kerosene.
Use wire brush for cleaning oil holes