PIN 6K8542 - Caterpillar

Remove Connecting Rod Bearings
start by:a) remove engine oil coolerb) remove engine oil pumpc) remove water pumpd) remove oil pressure relief valve 1. Disconnect tube (1) from carburetor and remove bolt (2) and clip from carburetor base.2. Loosen clamp (3) to remove pipe from coupling. 3. Remove four bolts (4) that fasten gas pressure regulator to cylinder block. Remove gas pressure regulator (5) and tube and pipe assembly. 4. Remove bolts (6) that hold inspection cover to block. Remove cover (7). 5. Turn the crankshaft (in the direction of normal rotation until rod caps (9) can be removed through the opening. Remove bolts (8) and rod caps (9). 6. Remove bearing (10) from the rod cap.7. Remove the upper half of bearings from the connecting rods.Install Connecting Rod Bearings
Install the rod bearings dry when the clearance checks are made. Put clean engine oil on the rod bearings for final assembly. 1. Install the upper half of new rod bearings (1) in the connecting rods. Be sure the tab on back of bearing fits in tab groove (slot) in connecting rod.
When connecting rod cap is installed, be sure that the number on side of cap is near to and respective to the number on side of connecting rod.
2. Install lower half of new bearings (2) in caps (3). Be sure the tab on back of bearing fits in tab groove (slot) of cap.
Do not use an impact wrench to tighten the rod bolts the additional 120°.
3. Check the bearing clearance with Plastigage (A). Install bearing cap on connecting rod. Install the rod bolts. Tighten the rod bolts first to a torque of 40 4 lb.ft. (55 5 N m). Put a mark on bolt heads and bearing caps. Tighten the bolts again 120° from the mark.4. Remove cap (3). Measure thickness of the Plastigage. The clearance between a new rod bearing and crankshaft journal must be .0031 to .0073 in. (0.079 to 0.185 mm). The maximum permissible clearance is .012 in. (0.30 mm).5. Put caps (3) in position on the connecting rods and install the bolts. Tighten the bolts to a torque of 40 4 lb.ft. (55 5 N m). Put a mark on the bolt heads and bearing caps then tighten the bolts 120° more. 6. Install inspection covers (4) with new gaskets. 7. Put gas pressure regulator (5) in position and install four bolts. Connect pipe (7) to coupling with clamp, and tube assembly (6) to carburetor. Install clip and bolt on carburetor base.end by:a) install oil pressure relief valveb) install water pumpc) install engine oil pumpd) install engine oil cooler