STARTER G. 4F8504 - Caterpillar

Measuring crankshaft end play(b) If the end play still exceeds the Repair limit even after new thrust plates have been installed, replace the plates with the next oversize ones. There are three oversizes for the thrust plates; namely, +0.15 mm (+0.0059 in.), +0.30 mm (+0.0118 in.) and +0.45 mm (+0.0177 in.). Generally, the rear journal is likely to be worn more rapidly than the front journal. This means that replacement of the rear thrust plates will, in most cases, gain the purpose. (5) Measuring runout of crankshaft
Measuring crankshaft runoutSupport the crankshaft on its front and rear journals in V-blocks, and measure the runout at the center journal, using a dial gauge. Depending on the amount of runout, repair the crankshaft by grinding or straightening with a press. If the runout exceeds the Repair limit, replace the crankshaft. (6) Replacing crankshaft gear
Replacing crankshaft gear(a) Using gear puller, remove the gear from the crankshaft. Do not remove the gear by driving with a hammer. (b) To install, heat the gear up to about 100°C (212°F) with a gear heater. Place the new gear on the crankshaft by aligning the key with the notch of the gear and give light blows of a copper hammer to the end face of the gear.(7) Replacing rear oil seal
Replacing rear oil sealIf the seal shows a sign of oil leaks, replace it with a replacement oil seal with sleeve.To install the sleeve, apply oil to the inside surface of the sleeve, and drive it onto the crankshaft, using crankshaft sleeve installer (A) (34291-00010), as shown.Main bearings
(1) Inspection Inspect each bearing shell for abnormal contact, scratching, corrosion, wiped overlay and other defects. Also check for a sign of poor seating in the bore of the crankcase or bearing cap.(2) Measuring main bearing clearance on journal
Measuring main bearing inside diameterFit the bearing shells to the crankcase and bearing cap, and tighten the cap bolts to the specified torque. Measure the inside diameter of the bearing in two positions, front and back along the longitudinal axis of crankshaft, in the criss-cross directions to take an average. Obtain the difference between the journal diameter and this inside diameter to determine the clearance. (3) Replacing main bearings If the clearance exceeds the Repair limit, replace the bearings, or refinish the crankshaft and use undersize bearings. If the crankshaft is refinished in compliance with any of the undersizes, it is not necessary to check the bearing contact pattern.3.3 Reassembly
Reassembling sequence (1) Installing main bearings (a) Install each upper shell in the crankcase by fitting its locking lip in the recess. The oil holes in the shell and crankcase will be aligned when the shell is so installed.(b) Apply a thin coat of engine oil to the inside surface of each shell.(c) Install the thrust plate to the rear face of crankcase with its oil groove facing outside.(2) Installing crankshaft (a) Wash the crankshaft with cleaning solvent, and dry it by directing pressure air.(b) Hold the crankshaft in horizontal position, and