ENGINE MAIN PARTS - DISASSEMBLY
2 - 12
3. Cylinder Block, Crankshaft, Pistons, Oil Pan
Cylinder damage,
stepped wear
Top face distortion
Connecting rod bend,
twist,
Big end thrust clearance
Crank journal/pin damage,
uneven wear, cracks, bend,
Clogged oil hole
The main bearings may be seized
due to poor oil maintenance etc.
In that case, the crankshaft must
be replaced.
Caution
Damaged plugs and
knock pins
Dirty or clogged oil and
water galleries
Damaged crankshaft
gear teeth
Seizing
Scoring
Pealing
Piston ring wear, damage,
Ring gap clearance
Piston wear, seizure,
streak,
Ring groove wear
Replace: Side seal
Disassembly of cylinder block, crankshaft, pistons and oil pan
<Disassembly sequence>
① Oil pan
② Oil strainer
③ Connecting rod cap
④ Connecting rod bearing (lower)
⑤ Connecting rod
⑥ Piston pin
⑦ No. 1 ring
⑧ No. 2 ring
⑩ Piston
(Remove ⑤ to ⑩ as an assembly.)
⑪ Connecting rod bearing (upper)
⑫ Main bearing cap
⑬ Main bearing (lower)
⑭ Crankshaft
⑮ Main bearing (upper)
⑯ Cylinder block
⑨ Oil ring
Note: If the crankcase is to be replaced, carefully remove the relief valve and other parts from the old
crankcase for reassembly onto the new crankcase.
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