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Follow-on Maintenance -706881054
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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APU CYLINDER HEAD-continued
TM 5-4210-233-14&P-1
5-71. APU CYLINDER HEAD
This task covers:
a. Removal
c. Installation
b. Cleaning and
d. Follow-on Maintenance
Inspection/Repair
TOOLS REQUIRED
EQUIPMENT CONDITION
Tool Kit, General Mechanics, Automotive
APU Removed (see para 4-207.)
(Appendix B, Section III, Item 1)
APU Flywheel Removed (see para 5-67.)
APU Gear Cover Removed (see para 5-68.)
Shop Equipment, Automotive
APU Governor Cup Removed (see para 5-69.)
Maintenance and Repair
APU Camshaft Removed (see para 5-70.)
(Appendix B, Section III, Item 4)
APU Crankshaft Removed (see para 5-71.)
Valve Seat Insert Cutter (Appendix B, Section III, Item 90)
Decompression Solenoid Removed
MATERIALS/PARTS REQUIRED
Injector Nozzle Removed (see para 5-77.)
Oil, Lubricating (Item 10, Appendix E)
Marking Compound, (Item 56, Appendix E)
Dry Cleaning Solvent (Item 3, Appendix E)
a. Removal.
(1) Remove the fuel injector nozzle and then remove the intake and exhaust manifolds for access to
rocker arm cover (1).
(2) Remove the rocker arm cover (1) and gasket (2) by removing two screws (3) and washers (4).
(3) Remove two cap screws (5) and four cap screws (6) with four washers (7) holding the cylinder head (8)
to the cylinder block.
CAUTION
Do not use a pry to separate cylinder head from cylinder block. It
will damage cylinder head and/or cylinder block.
(4) Remove the cylinder head (8). If it sticks, rap it sharply with a soft hammer. Remove the cylinder head
gasket (8A).
(5) Remove rocker arms (9), push rods (10), seals (I 1), shields (12), springs (13), washers (14), seals (15),
tappets (16), balls (17) and nuts (18).
(6) Using a valve spring compressor, disassemble the valve assemblies which include valve stem cap
(19), valve spring retainer locks (20), spring retainer (21), spring (22), oil seal (23) (intake valve only)
valve guide (24), valve (25) and valve seat (26).
(7) Remove push rod guide (27).
(8) Disassemble the decompression release assembly by removing palnut (28), retaining ring (29),washer
(30), arm (31), spring (32) and pin (33).
5-384

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