CRANKSHAFT GP 2168316 - Caterpillar

Family Of EnginesSUPPLEMENT: AUGUST 1998Engine News, Article 14, Page 11, January 1996; "New Main Bearing Provides Improved Oil Distribution".Disregard this article. See Engine News SEBD9263, Article 9, Page 17 titled "New Main Bearing Used".
--------------- END SUPPLEMENT ---------------Description of Change: A new main bearing is used in these engines. The oil groove in the new bearing is longer and deeper. Pockets have been added inside the bearing face at the bearing split lines. These changes provide improved oil distribution. See the illustration. The new bearing has increased thickness of bearing material, but the bearing clearance has not changed. This makes the bearing more embeddable and more conformable. This will provide a more seizure resistant main bearing. The crush height of the new bearing has been increased. This will tighten the fit between the bearing and cylinder block. The tighter fit will help prevent the formation of deposits between the bearing and block. When the new main bearings are used to replace former main bearings, a reduction of up to 40 kPa (5.8 psi) in the oil pressure reading is normal.The new replacement over and under sized crankshaft main bearings have the same changes.
Pockets at the bearing split lines (A). Increased groove length and depth (B).Adaptable To: The chart identifies the new and former crankshaft main bearings. The new bearings are direct replacements for the former bearings. The former bearings are canceled.