TM 55-1930-209-14&P-21
5-60 Blower drive coupling, removal and disassembly
a.
Removal
(1)
Remove blower assembly.
(2)
Withdraw blower drive shaft from drive support.
(3)
Disconnect oil tube.
(4)
Remove drive support attaching bolts.
(5)
Tap drive support to loosen it.
(6)
Carefully withdraw support from end plate so blower drive gear teeth will not be damaged.
b.
Disassembly. Disassemble blower drive coupling.
5-61 Blower drive coupling, cleaning, inspection and repair
a.
Cleaning. Clean all parts with cleaning solvent or diesel fuel and dry thoroughly. Ensure that oil grooves and
other passages are free of dirt.
b.
Inspection and Repair. Inspect inside diameter and thrust surfaces of blower drive gear support hub for scoring
and wear. The clearance between shaft and support should be between .0010 to .0025 inch with new parts. A maximum
of . 0050 inch is allowed with used parts. Replace worn or scored bearings.
c.
Inspect drive shaft for signs of excessive wear, scoring and worn gear teeth. Replace a defective shaft.
d.
Inspect blower drive coupling support, cam spring seats, and spring packs. Replace worn or damaged parts.
e.
Examine blower drive support thrust washer for scoring and wear. Replace thrust washer which is .093 to .103
inch.
5-62 Blower drive coupling, reassembly and Installation
a.
Reassembly. Reassemble blower drive support components in reverse of disassembly.
b.
Installation
(1)
Install blower drive coupling.
(2)
Install blower assembly.
Section XVI.
Rocker Arms and Cylinder Head
5-83 General
a.
Rocker Arms
(1)
Three rocker arms are provided for each of four cylinders; two outer arms operate exhaust valves and
center arm operate fuel injector.
(2)
Each set of three rocker arm assemblies pivots on a separate shaft supported by two brackets. A single
bolt secures each bracket to top of cylinder.
(3)
Rocker arms are operated by camshaft through cam followers and short push rods extending through
cylinder head (Figure 5-26).
5-70
