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 TM 55-1905-223-24-5
e.
Valve Guides. Inspection and replacement procedures.
(1)
Inspection.
(a)
Check the inside diameter of the valve guide. Replace the guide if the
bore is worn larger than 0.455 inch (11.56 mm).
(b)
Use a bore gauge to check the bore at four points spaced 90 degrees
apart to find if the bore is out-of-round. Check the full length of
the bore. Replace the guide if it is out-of-round.
(c)
Visually check the guides for damage.
(2)
Replacement.
(a)
Remove the worn valve guides. Use the valve guide mandrel to install
the new valve guides.
(b)
If the bore for the valve guide is damaged and is to be repaired, use
the reamer, ST-1188 to cut the bore to measure 0.760 to 0.761 inch
(19.30 to 19.33 mm) inside diameter. Make sure the reamer cuts the
entire bore. Remove all sharp edges.
NOTE
If the damage to the valve guide bore is not removed by using the ST-1188
reamer, use the ST-1187 reamer to cut the bore to the next largest size.
Repeat steps (a) and (b) to cut the bore to measure 0.765 to 0.766 inch (19.43
to 19.46 mm). Install the oversize valve guide. You can ream the hole in the
valve spring guides to measure 0.768 to 0.775 inch (19.51 to 19.63 mm) so the
spring guides will fit the oversize valve guides.
4-16
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