Mack E7, Service Manual

Page: 162 / 303

Page 6-4
200 ENGINE ASSEMBLY
Figure 6-2 — Cylinder Block Cup Plugs
INSTALLATION
1. After cleaning the plug hole, apply a thin
coat of Loctite
®
277 to both the surface of
the hole and the outer edge of the plug.
2. Using a proper driver, align the plug in the
hole and drive it inward until the outer lip of
the plug is flush with the cylinder block.
Refer to Figure 6-3.
Figure 6-3 — Cylinder Block Cup Plug Installation
Pipe Plug Replacement
Any rust around a pipe plug is an indication of a
leak and the plug should be replaced.
REMOVAL
1. Using an appropriate wrench, remove the
plug.
2. Clean the threads in the block by running a
tap into the hole, just far enough to remove
any rust on the threads without expanding
the diameter of the hole. Use compressed
air to remove any chips from the block.
It is best to replace a leaking pipe plug. However,
if reusing the same plug, clean thoroughly, paying
special attention to the threads.
3. Using a wire wheel, clean the threads of the
plug. Visually check the thread surfaces for
burrs or damage. Then clean and check the
remaining surfaces.
New plugs already have a sealer applied to the
threads. Applying a Teflon sealer to the threads
will not adversely affect the precoating.
INSTALLATION
Apply appropriate Teflon thread sealant to the
threads and install the plug. Torque to
specification. Refer to Torque Chart in the
SPECIFICATIONS section of this manual.
When checking or assembling engine
components, refer to the Fits and Limits Chart
and Torque Chart in the SPECIFICATIONS
section of this manual for specified dimensions
and torque settings.
5-101.bk Page 4 Friday, March 17, 2006 11:05 AM