TM 5-3810-294-34
CHAPTER 4
REPAIR OF CRANE ENGINE
Section I. GENERAL
(2) Governor and throttle controls
4-1. Description
(3) Tachometer drive mechanism
(4) Fuel pump, fuel filter, and fuel lines
The crane engine is an in-line, 6 cylinder, International
(5) Air cleaner and breather system
Harvester engine model U-450.
(6) Carburetor
4-2. Engine Removal
(8) Radiator and fan
(9) Oil cooler
Refer to paragraph 2-13 and remove the engine from the
(10) Electrical components including generator,
crane. Install the engine on a suitable overhaul stand for
starting motor, plugs, distributor, sending units, and
ease of disassembly operation detailed below.
wiring.
(11) Water pump
4-3. Removal of Accessories
(12) Manifolds
b. With the above accessories removed from the
a. Refer to TM 5-3810-294-20 and remove the
engine, the following disassembly and repair procedures
following from the engine.
can be accomplished.
(1) Oil filters and lines
Section II. REPAIR OF CYLINDER HEAD, ROCKER ARM AND VALVES
cover, aerates the valve chamber enclosed by the
4-4. Description
cylinder head cover. The cylinder head is a one-piece
casting and is stud mounted to the top of the crankcase.
An overhead type valve mechanism is used on this
engine. The rocker arm shaft assembly is mounted to
4-5. Removal of Head
the top of the cylinder head and is lubricated by
pressurized oil from a rifle-drilled passage running
Refer to figure 4-1 and remove head as follows.
through the crankcase and head. A crankcase breather,
connected to the top of the cylinder head
Key to fig. 4-1
1.
Crown nut (4)
18.
Head gasket
34.
Intake valve seat ring(6)
2.
Washer (4)
19.
Tube (6)
35.
Tappets (12)
3.
Cylinder head cover
20.
Cup (6)
36.
Retainers (2)
4.
Gasket
21.
Lock (12)
37.
Washer (2)
5.
Bolt (8)
22.
Retainer (6)
38.
Spring (2)
6.
Stud (4)
23.
Inner spring(12)
39.
Adjustment nut (12)
7.
Washer (2)
24.
Outer spring (12)
40.
Adjustment screw (12)
8.
Washer (4)
25.
Lower spacer (12)
41.
Rocker arm (12)
9.
Head bolt-oil
26.
Retainer lock (12)
42.
Bushing (12)
10.
Oil bolt gasket
27.
Retainer (6)
43.
Bracket (6)
11.
Pushrods (12)
28.
Intake valve (6)
44.
Spring (4)
12.
Headbolt-short (11)
29.
Exhaust valve (6)
45.
Expansion plug (2)
13.
Headbolt-long(10)
30.
Valve guide(6)
46.
Shaft (front)
14.
Washer (21)
31.
Valve guide (6)
47.
Coupling
15.
Oil bolt washer
32.
Oil seal (6)
48.
Shaft (rear)
16.
Lifting eye
33.
Exhaust valve seat ring (6)
49.
Oil connector
17.
Head
4-1
