Ford XW7Z-6D309-AA
Main Bearings

First clean the area to avoid engine failure from foreign materials because a clean surface plays a crucial role in servicing and repairing the crankshaft main bearings. Begin services by taking off the oil pan together with any needed replacements of the oil pump. Engine damage prevention occurs when you handle crankshaft main bearings one set at a time starting with one crankshaft main bearing cap removal then the crankshaft main bearing installation. New bearings must receive engine oil lubrication before installation and the rear bearing cap requires two dots of gasket maker between the cylinder block. The crankshaft main bearing cap must be installed before securing it with a torque of 80 Nm (59 ft. lbs.). The procedure should be repeated until all crankshaft main bearings receive new parts. Installation of the oil pan and oil pump should be done in this order when both components were previously removed.

A proper start to crankshaft main bearing services requires cleaning the area to avoid contaminating fluid channels with foreign materials that could destroy the engine. The first step consists of removing the oil pan accompanied by an oil pump removal if needed. Engine damage prevention requires replacing crankshaft main bearings starting with the removal of one crankshaft main bearing cap before moving to the crankshaft main bearings one set at a time. Clean engine oil should be used for lubricating the new bearings before installation while applying gasket maker in two dots between the rear bearing cap and cylinder block. The installer should fasten the crankshaft main bearing cap at 80 Nm (59 ft. lbs). The procedure should be repeated for each crankshaft main bearing while installing fresh bearings as required. The last step involves reinstalling the oil pan and the oil pump if you removed them.

It indicates a damaged journal.

Defects include cratering fatigue failure, spot polishing due to incorrect seating, imbedded dirt from engine oil, scratching caused by dirty engine oil, base exposure from poor lubrication, both edges worn from journal damage, and one edge worn where the journal is tapered or the bearing is not seated.

Begin by removing the oil pan.

Cratering suggests fatigue failure.

Base exposure signifies poor lubrication.