Figure 14-3. Installing Neoprene Seal in Rear Filler Block

TM 10-3930-644-14&P

Replace the neoprene seal by holding it in place for

assembly (Figure 14-2 and 14-3). Use only a small spot

of non-hardening cement in center of the contacting

surface, before inserting seal in groove.

No other

cement is required.

Figure 14-5. Neoprene Seals in Place

In order to prevent possible oil leaks, it is imperative to

use only genuine Allis Chalmers replacement gaskets

and seals-since these have been engineered and

Figure 14-3. Installing Neoprene Seal in Rear Filler

designed to do a superlative job. however, it has been

Block

determined that 90% of all rear main oil seal leak

complaints checked are leaks in the pan gasket, rocker

Install the neoprene seal in the front filler block in the

covers, side covers, etc., and are not leaking rear main

same manner as in the rear filler block (Figure 14-4).

oil seals.

The following is a suggested procedure to determine the

exact location of an oil leak:

1. Wipe the under side of the engine to clean all

dirt and oil from the oil pan, etc.

2. Plug breather pipe and oil filler opening with

rags.

3. With the engine idling, blow compressed air (35

p.s.i. or less) into the dip stick pipe or opening.

4. Watch for oil leak and trace to the source.

Figure 14-4. installing Neoprene Seal in Front Filler

5. Determine whether the oil is coming from the

Block

pan gasket, pan gasket end seal, leaky fitting,

rocker cover gaskets, push rod cover gasket, or

D. INSTALLATION

from any source other than the rear main oil

seal.

NOTE

When replacing the front filler block

capscrews, make certain capscrews

6. A small mirror and flashlight are handy tools to

include a nylock patch to lock screws

use in checking hard to see places.

firmly in place.

Torque nylock patch screw to 15-20 pounds foot.

Lubricate outside or rear and front neoprene seals

before installing oil pan to prevent possible distortion of

seals. When replacing gear cover, cement cover with a

quick drying gasket cement and reassemble to engine

block (Figure 14-5).

3-47