Question 1

How to check the end play of a crankshaft before removing it on Pontiac Fiero?

Accepted Answer

It is advisable to inspect the end play when an overhaul of the crankshaft is to be done by mounting a dial indicator such that the stem is parallel to the crankshaft and touching one of the crank throws. Rotate the crankshaft to the rear and set the dial indicator at zero, rotate the crankshaft forward and read a value of the end play. If it go beyond the said limit, then check the thrust surfaces of wear; if there is none, then new main bearings may rectify the problem. Incase one cannot find a dial indicator, use feeler gauges, pull the crankshaft towards the front and ease the gauges in between the crankshaft and the thrust main bearing to get the clearance. Remove the main bearing cap bolts an eighth turn at the time until they could be pulled out by hand and the caps are often numbered from front to rear, thus these marks are useful for the proper positioning of the cap bolts. If unlabeled they can be marked by the use of a stamping die or a center punch. As mentioned earlier most of the caps are marked with a cast-in arrow symbol that points to the front direction. Tap the caps lightly with a soft-face hammer to provide the required clearance and you can easily lift the caps off using the bolts and ensure that the bearing inserts are not dropped when doing so. Lastly, remove the crankshaft from the engine and it is recommended to do it with help, then put back the bearing caps to their positions on the head of the engine, tighten the bolts with fingers only.

Question 2

What steps must be taken to remove the crankshaft from the engine after it has been taken out on Pontiac Grand Prix?

Accepted Answer

The crankshaft can only be removed after the engine has been taken out of the vehicle, assuming that the flywheel or driveplate, crankshaft balancer/vibration damper, timing chain, timing gear, oil pan, oil pump, and piston/connecting rod assemblies have already been detached. For Quad-4 engines, the rear main oil seal housing must be unbolted and separated from the block prior to crankshaft removal. Before proceeding, 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 movement indicates the endplay. If it exceeds the specified limit, inspect the crankshaft thrust surfaces for wear, and if none is found, new main bearings may resolve the issue. If a dial indicator is unavailable, feeler gauges can be used by prying the crankshaft to the front and measuring the clearance between it and the thrust main bearing. Ensure the main bearing caps are marked for their locations, numbered consecutively from front to rear, and if not, mark them appropriately. Loosen the main bearing cap bolts gradually until they can be removed by hand, noting any stud bolts for proper reinstallation. Gently tap the caps with a soft-face hammer to separate them from the engine block, using the bolts as levers if necessary, and take care not to drop the bearing inserts. Finally, lift the crankshaft out of the engine, ideally with assistance due to its weight, and with the bearing inserts in place, return the caps to their original positions on the engine block and tighten the bolts finger tight.

Question 3

How to check the endplay of a crankshaft before removal on Pontiac Firebird?

Accepted Answer

Before removing the crankshaft, 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 the crankshaft to the front and check the reading; the distance moved indicates the endplay. If it exceeds specifications, inspect the thrust surfaces for wear, and if no wear is found, new main bearings may resolve the issue. If a dial indicator is unavailable, use feeler gauges by prying the crankshaft to the front and slipping the gauges between the crankshaft and the thrust main bearing to measure clearance. Loosen the main bearing cap bolts a quarter turn at a time until they can be removed by hand, ensuring the caps are marked for their locations, typically numbered from front to rear. If unmarked, use stamping dies or a center punch to label them. Gently tap the caps with a soft-faced hammer to separate them from the engine block, using the bolts as levers if necessary, and avoid dropping the bearing insert. For models with a one-piece seal retainer, remove the retainer and seal. Carefully lift the crankshaft out of the engine, ideally with assistance due to its weight, and with the bearing inserts in place, return the caps to their respective locations on the engine block and tighten the bolts finger tight.

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