Disassembly Of Engine - Yanmar 3TNV82A-B Service Manual

ENGINE
1 – Cylinder Block
2 – Camshaft Bushing
3 – Gear Case (3TNV94 - 4TNV106)
4 – Dowel (2 used)
5 – O-Ring
6 – Front Plate (3TNV82 - 4TNV88)
7 – Gear Case Cover (3TNV82 - 4TNV88)
8 – Front Crankshaft Seal
9 – Gear Case Cover (3TNV94 - 4TNV106)
10 – Tappets
11 – Camshaft
12 – Camshaft Gear Key
13 – Camshaft End Plate
14 – Camshaft Gear
15 – Idler Gear Shaft
16 – Idler Gear Bushing
17 – Idler Gear
18 – Oil Pickup O-Ring
19 – Oil Pickup
20 – Crankshaft
21 – Parallel Pin
22 – Crankshaft Gear Key
23 – Crankshaft Gear
24 – Crankshaft Pulley
25 – Main Bearing Inserts
26 – Main Bearing Cap
27 – Oil Pan
28 – Thrust Bearings
29 – Flywheel
30 – Connecting Rod Cap
31 – Connecting Rod Bearing Inserts
32 – Connecting Rod
33 – Wrist Pin Bushing
34 – Circlip
35 – Wrist Pin
36 – Piston
37 – Oil Ring
38 – Second Compression Ring
39 – Top Compression Ring
40 – Crankshaft Rear Seal
41 – Crankshaft Rear Seal Housing

Disassembly of Engine

Prepare a clean, flat working surface on a
workbench large enough to accommodate the
engine components. Discard all used gaskets,
O-rings and seals. Use new gaskets, O-rings and
seals on reassembly of engine.
6-72
Crankshaft and Camshaft Components
CAUTION
Identify all parts and their location using
an appropriate method. It is important
that all parts are returned to the same
position during the reassembly process.
If the engine will be completely disassembled, the
following preliminary steps should be performed:
1. Disconnect the battery cables at the battery.
Always disconnect the negative (-) cable first.
2. Remove the throttle cable, electrical
connections, intake and exhaust system
connections, and fuel supply lines from the
engine.
3. Remove the alternator. See Removal of
Alternator on page 12-12.
4. Drain the engine coolant from the radiator and
cylinder block. See Drain, Flush and Refill
Cooling System With New Coolant on
page 5-36. Remove the cooling system
components from the engine.
5. Remove the engine from the machine. Mount
the engine to a suitable engine repair stand
having adequate weight capacity.
A
CAUTION
Be sure to secure the engine solidly to
prevent injury or damage to parts due to
the engine falling during work on the
engine.
6. Clean the engine by washing with solvent, air or
steam cleaning. Carefully operate so as to
prevent any foreign matter or fluids from
entering the engine or any fuel system or
electrical components remaining on the engine.
7. Drain the engine oil into a suitable container.
Remove the oil filter.
8. Remove the cylinder head. See 2-Valve
Cylinder Head on page 6-34 or 4-Valve Cylinder
Head on page 6-49.
TNV DI Service Manual
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