TRUNNION 9C9191 - Caterpillar

Remove Crankshaft Main Bearings
start by: a) remove engine oil coolerb) remove fresh water pumpc) engine oil pumpd) remove oil pressure regulator valvee) remove starters1. Fasten a hoist and remove the prelubrication pump and motor as a unit (if so equipped). Weight is 105 lb. (47.3 kg).2. Remove the wire harness and plate for prelubrication oil pump and motor. 3. Remove the bolts (1) that hold inspection covers to block. Remove the inspection covers (2) from each side of block. 4. Remove the nuts for main bearing caps with wrench (B). Remove the bearing cap with lower half of main bearing. 5. Use tool (A) to move out the upper half of main bearing as the crankshaft is turned in the normal direction of rotation. On the bearing journal that has no drilled hole, put a thin piece of fiber, hardwood or plastic against end of bearing opposite tab. Hit the bearing lightly with the above until tab of bearing is free from cylinder block. Remove the upper half of bearings.Install Crankshaft Main Bearings
1. Put clean engine oil on bearing surfaces of upper halves of bearings. Use tool (A) to install upper half of bearing in cylinder block. The bearing with oil hole is upper half.2. Clean main bearing caps and install lower halves of bearings in caps.
TYPICAL EXAMPLE When the bearing clearance is checked and the engine is in a vertical position, such as in the vehicle, the crankshaft will have to be lifted up and held against the upper halves of the main bearings to get a correct measurement with wire (C). The wire will not hold the weight of the crankshaft and give a correct indication. If the engine is in a horizontal position, such as on an engine stand, it is not necessary to hold the crankshaft up. Do not turn crankshaft when lead wire is in position to check clearance. If lead wire is not available, PLASTIGAGE can be used to check bearing clearance. 3. Use wire (C) to check bearing clearance. Install caps and tighten both nuts with tool (B) to 200