HARNESS AS-WIRING 3812499 - Caterpillar

CONFIDENTIAL TIBU3640-00
TECHNICAL INFORMATION BULLETIN JULY 10, 2002
ENGINES 3126 (6MK, 1ZJ),
3126B (9ZF, 3GS) MARINE ENGINES
Component Code 1302SUBJECT: OIL LEAKS FROM THE OIL PAN AND/OR THE REAR SEAL CARRIER
FOR THE CRANKSHAFT
PROBLEM:
There have been reports of oil leaking from the oil pan and/or the rear seal carrier for the crankshaft. The exact location of the leak can be difficult to determine. Oil leaking from the rear seal carrier can travel along the side of the cylinder block and appear to be a leak caused by the oil pan gasket.
The number of reports has increased since the introduction of the 166-2905 Oil Pan Gasket. This gasket includes integrated seals.
SOLUTION:
This problem is currently under investigation. In the interim, production engines are now using the 115-4202 Gasket (perforated core oil pan gasket). Also, the 1U-8846 Gasket Maker is applied to the rear of the cylinder block in an improved pattern.
To repair oil leaks in the field, first determine the exact location of the oil leak. Clean the area thoroughly, operate the engine, and verify the location of the leak.
Note: Use the applicable Disassembly And Assembly Manual as a guide when performing the following procedures.
If the leak source is determined to be the oil pan gasket, install a 115-4202 Gasket (perforated core oil pan gasket).
Note: If the engine already has a 115-4202 Gasket in place, no changes to oil pan installation hardware is required. If the engine has a 166-2905 Gasket (integrated seal type gasket), an additional 9M-1974 Washer must be added to each oil pan mounting bolt. This is due to the reduced thickness of the 115-4204 Gasket.
If the leak source is determined to be the located at the rear seal carrier, the rear seal carrier must be removed. The contact surfaces of the rear seal carrier and the cylinder block must be thoroughly cleaned with 138-8440 Component Cleaner. Apply 169-5464 Quick Cure Primer to the surface of the surface of the cylinder block that contacts the rear seal carrier. Allow the primer to air dry for three to five minutes. Apply 1U-8846 Gasket Maker to the surface to the cylinder block that contacts the rear seal carrier. It is recommended to apply the gasket maker around the bottom two bolt holes on each side, and across the bottom of the rear seal carrier joint. Illustrations 1 and 2 show the recommended pattern for the gasket maker. The rear seal carrier must be installed within ten minutes of the application of the 1U-8846 Gasket Maker.
ILLUSTRATION 1.
(View of the Lower Left Surface of the Rear of the Cylinder Block)
Rear Surface of the Cylinder Block (A).
Recommended Pattern of Bead of 1U-8846 Gasket