Page 252
REPAIR INSTRUCTIONS, PART 1
Cylinder Head Pipe Plug
Replacement
GENERAL INFORMATION
Current-production 3/4-inch pipe plugs are
installed with a preapplied encapsulated epoxy
sealant. With the epoxy sealer, the pipe plugs are
locked into place, making them immovable when
normal loosening/tightening methods are used.
Should it become necessary to remove a pipe
plug, the following procedure should be used.
If a cylinder head has been placed in a hot
chemical tank for cleaning and degreasing, the
pipe plugs must be checked for looseness. If a
plug is found to be loose, the epoxy seal has
been broken, making it necessary to remove the
plug, clean the plug and cylinder head threads
with Loctite
®
Primer T and reseal the threads with
Loctite
®
277.
REPLACEMENT (3/4-INCH PLUGS)
Refer to Figure 276.
1. Heat the pipe plug to 400°F (205°C) with a
torch.
2. With the pipe plug heated sufficiently,
remove the plug from the cylinder head.
3. Remove the epoxy sealant from the threads
on both the plug and in the cylinder head.
4. Clean the plug and cylinder head threads
with Loctite
®
Primer T.
5. Apply Loctite
®
277 sealant to the plug and
cylinder head threads.
6. Install the plugs and tighten to the specified
torque, 55 lb-ft (68 N폷m).
276
Figure 276 — Cylinder Head Cup and Pipe Plug Locations
1. 1-1/16-inch Cup Plug
2. 3/4-inch NPT Plug
3. 13/16-inch Cup Plug
5-111.bk Page 252 Monday, July 10, 2006 2:26 PM
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