ARIA

ENGINE

14.Install piston rings in their respective position on

piston using ring expander.

15.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 5th 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 fly-

wheel 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.

-chamfer oil holes on journals to avoid scoring

of new bearing shells.

14.Finish journals by lapping them with 320 grit lap-

ping cloth of suitable width.

15.After grinding recheck main bearing and crank pin

journal dimensions.