Mercury E9SZ-6V303-BRM Kit - Remanufactured Crankshaft

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The crankshaft can only be removed after the engine has been taken out of the vehicle, assuming that the flywheel or driveplate, vibration damper, timing chain, oil pan, oil pump, and piston/connecting rod assemblies have already been detached. Before removal, check the endplay by mounting a dial indicator with the stem aligned with the crankshaft and touching one of the crank throws. Push the crankshaft to the rear and zero the dial indicator, then pry it to the front and check the reading; the distance moved indicates the endplay. If it exceeds specifications, inspect the crankshaft thrust surfaces for wear, and if no wear is found, new main bearings should resolve the issue. If a dial indicator is unavailable, feeler gauges can be used by pushing the crankshaft to the front and slipping the gauges between it and the thrust main bearing to measure clearance. Check the main bearing caps for markings indicating their locations, ensuring they are numbered consecutively from front to rear; if not, mark them with number stamping dies or a center punch near one of the bolt heads. Main bearing caps typically have a cast-in arrow pointing to the front of the engine. Loosen each cap bolt a quarter turn at a time until they can be removed by hand, gently tapping the caps with a soft-face hammer if needed, and using the bolts as levers to avoid dropping the bearing inserts. Carefully lift the crankshaft out, ideally with assistance due to its weight, and with the bearing inserts in place, return the caps to their original locations on the engine block and tighten the bolts finger tight. It is important not to refinish the crankshaft journals beyond 0.010 in. (0.25 mm) to prevent fatigue failure, and for supercharged engines, do not refinish the crankshaft at all as the journals are already undersized by 0.010 in.

Have the crankshaft reground by an automotive machine shop. Use the correct size bearing inserts if the crankshaft is reconditioned. Note that the crankshaft journals can't be machined more than 0.010 inch under the standard dimension, and the rear journal on supercharged engines can't be refinished at all.

The final step is to check the crankshaft end play with a feeler gauge or a dial indicator. The end play should be correct if the crankshaft thrust faces aren't worn or damaged and new bearings have been installed.

Do not refinish the crankshaft journals to more than 0.010 in. (0.25 mm). Further main journal refinishing may cause fatigue failure of the crankshaft. On supercharged engines, do not refinish the crankshaft at all as the journals are already under size 0.010 in.

If a journal picks up copper from the penny, it is too rough and must be reground.

Starting with the center main and working out toward the ends, tighten the main bearing cap bolts in three steps to the torque specified in the chapter's specifications. Do not rotate the crankshaft during this operation.