DISASSEMBLY OF BASIC ENGINE
5-12
4. Disassembling and inspecting piston, connecting rod, crankshaft and crankcase
Disassembling and inspecting piston, connecting rod, crankshaft and crankcase
Disassembling sequence
Note: When replacing the crankcase, carefully remove parts (relief valve, etc.) mounted on the non-reusable crankcase so that
they can be reused.
1 Connecting rod cap 7 Connecting rod 13 No.2 compression ring
2 Connecting rod bearing (lower) 8 Connecting rod bearing (upper) 14 Oil ring
3 Main bearing cap 9 Snap ring 15 Tappet
4 Main bearing cap (lower) 10 Piston pin 16 Crankcase
5 Crankshaft 11 Piston 17 Check valve
6 Main bearing (upper) 12 No.1 compression ring
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Damaged threads
Cracks
Flaking, uneven contact
Scratches,
cracks, dint,
clogged oil holes,
wear
Wear
Wear
Wear, damage
Fatigue
Damaged threads
Wear, clogged oil holes
Cracks, clogged oil holes
Serration for cracks, wear
Surface scratches, cracks,
damage, wear, carbon deposits
Adhesion of water
scale, corrosion,
flaking
Scratches on inside and outside surfaces,
corrosion, flaking, seizing
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