TM 9-2320-260-34-1
3-51. CYLINDER HEAD REPAIR (Contd)
CAUTION
Position cylinder head on a clean wooden bench or protective
surface with intake port face down. Failure to do so may result in
damage to cylinder head.
NOTE
Valves must be installed in original locations on cylinder head.
Ensure cylinder head (7) is clean (para. 2-8).
7.
Dip valve stems (1) in clean lubricating oil.
8.
Install valve stems (1) through valve guides (5) from face side (6) of cylinder head (7). Ensure each
9.
valve (3) is correctly seated.
Position cylinder head (7) face down on workbench with all valves (3) installed.
10.
NOTE
P/N 128879 spring guide cannot be used with P/N 211999 valve
spring. Use P/N 170296 spring guide for both P/N valve springs
211999 and 178869.
Reground valve heads seat deeper in cylinder head allowing
valve springs to extend beyond length limits of 2.250 in.
(57.150 mm). Use spacers up to 0.0625 in. (1.588 mm) to reduce
valve spring to proper height. A maximum of two 0.0313 in.
(0.794 mm) spacers may be used. Do not use spacers to com-
pensate for weak springs.
Install eight lower spring guides (8) on valve guides (5) and seat to cylinder head (7).
11.
CAUTION
Do not mix intake and exhaust springs. Intake springs are longer.
Mixing springs may result in damage to equipment.
12.
Install eight valve springs (9) on lower spring guides (8).
13.
Install eight upper spring guides (10) over valve stems (1) on top of valve springs (9).
WARNING
Use caution when compressing valve springs. Wear eye protection
at all times when installing valves. Failure to do so may cause
injury to personnel.
14. Using spring compressor, compress each valve spring (9) until grooves (2) on valve (3) are exposed.
15. While compressed, install two new half-keepers (4) into grooves (2) of each valve (3). Slowly release
spring compressor.
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