TM 9-2320-260-34-1
3-51. CYLINDER HEAD REPAIR (Contd)
CAUTION
Intermixing of old and new valve springs and valve guides in any
one cylinder head is permissible only if a specific crosshead has
two of the same type guides and springs installed under it.
50. Inspect valve springs (1) for distortions and cracked or collapsed coils. Replace valve springs (1) if
distorted or if coils are cracked or collapsed.
NOTE
Valve springs come in two sizes. The shorter valve spring is
referred to here as No. 1 and the longer valve spring is referred
to as No. 2.
51. Measure valve spring No. 1 free length. Free length should be 2.29 in. (58.2 mm). Measure valve
spring No. 2 free length. Free length should be 2.69 in. (68.3 mm). Replace valve spring No. 1 or
No. 2 if free length is incorrect.
52. Using spring tester, inspect valve spring (1) by checking the load when valve spring (1) is com-
pressed. Replace valve spring No. 1 if spring does not give a load test of at least 150 lb (667 N) when
compressed to 1.77 in. (45 mm). Replace valve spring No. 2 if spring does not give a load test of at
least 143 lb (636 N) when compressed to 1.72 in. (43.7 mm).
d. Assembly
NOTE
Perform steps 1 through 6 only if inspection requires replacement.
Use repaired and inspection approved cylinder heads only.
1.
Using hammer and punch, remove worn valve guide(s) (3) from underside of cylinder head (2).
Discard valve guide(s).
2.
Using valve guide driver and valve guide arbor, install new valve guide(s) (3) on cylinder head (2).
3.
Using valve pin extractor, remove defective crosshead guide(s) (4) from cylinder head (2). Discard
crosshead guide(s) (4).
4.
Clean hole in crosshead guide (4) (para. 2-8).
5.
Using guide head spacer, install new crosshead guide(s) (4) on cylinder head (2).
Measure height of crosshead guide(s) (4). Assembled height must be 1.860-1.880 in.
6.
(47.24-47.75 mm).
3-162
