SECTION 10 – ENGINE – CHAPTER 1
10-14
PROBLEM
REMEDY
POSSIBLE CAUSES
Engine knocks
1.
Diluted or thin oil
1.
Check crankshaft bearings for
damage, change as required.
Drain and refill with specified oil
and renew filter. Ascertain cause of
dilution
2.
Insufficient oil supply
2.
Check oil level and top up as
necessary. Overhaul or renew
pump as necessary. Check oil filter
is not clogged
3.
Low oil pressure
3.
Overhaul pump or relief valve as
necessary
4.
Excessive crankshaft end play
4.
Install new thrust bearing liner
5.
Flywheel or ring gear run–out
excessive
5.
Skim flywheel or fit new ring gear
6.
Excessive connecting rod or main
bearing clearance
6.
Install new bearing inserts and/or
re–grind crankshaft
7.
Bent or twisted connecting rods
7.
Renew connecting rods
8.
Crankshaft journals out– of–round 8.
Re–grind crankshaft and fit
undersize bearing inserts
9.
Excessive piston–to– cylinder
bore clearance
9.
Re–bore/re–sleeve block and fit
new pistons
10. Excessive piston ring clearance
10. Fit new pistons and rings
11. Broken rings
11. Fit new rings, check bore and
pistons for damage
12. Excessive piston pin clearance
12. Fit new piston or pin
13. Piston pin retainer loose or missing 13. Install new retainer, and check
bore/pistons for damage
14. Excessive camshaft play
14. Install new thrust plate
15. Imperfections on timing gear teeth 15. Renew timing gear
16. Excessive timing gear backlash
16. Check and adjust backlash /renew
timing gear
