SWITCH (back up alarm) 2V7510 - Caterpillar

START BY:a. remove oil pump1. Check the connecting rods and caps for their identification and location. 2. Turn the crankshaft until the connecting rod caps are in the position shown.3. Remove nuts (1) and the cap from the connecting rod. Remove the lower half of the bearing from the cap.4. Push the connecting rod away from the crankshaft. Remove the upper half of the bearing from the connecting rod. Install the bearings dry when the clearance checks are made. Put clean engine oil on the bearings for final assembly.5. Install the upper half of the bearing in the connecting rod.6. Pull the connecting rod slowly on to the crankshaft.7. Install the lower half of the bearing in the cap. Be sure the tabs in the back of bearings are in the tab grooves of the connecting rod and cap. 8. Use Plastigage (A) to check the bearing clearance.9. Put Plastigage (A) on the bearing.10. Put clean engine oil on the threads of the rod bolts and seat surfaces of the nuts. Be sure the cylinder numbers on the rod cap and rod are the same and are on the same side of the connecting rod. Numbers are on the same side of the rod and cap as are the bearing tab slots. If new rods are installed, put the cylinder number on the rod and cap. Do not turn the crankshaft when Plastigage (A) is in position.
Do not use an impact wrench to tighten the bolts the additional 120° 5° when the bearing clearance is being checked.
11. Install rod caps (2). Install the nuts. Tighten each nut to a torque of 80 8 N m (60 6 lb.ft.). Put a mark on the nuts and cap, and tighten the nuts an extra 120° 5° from the mark. Remove the rod cap. Remove Plastigage (A), and check the bearing clearance. The bearing clearance must be 0.071 to 0.168 mm (.0028 to .0066 in.) for new bearings. Maximum clearance with used bearings is 0.25 mm (.010 in.).12. Put clean engine oil on lower half of the bearing. Install the rod cap again. Tighten each nut to a torque of 80 8 N m (60 6 lb.ft.). Put a mark on the nuts and cap, and tighten the nuts an extra 120° 5° from mark.13. Do Steps 1 through 12 for the remainder of the connecting rod bearings.END BY:a. install oil pump