Chevrolet 14088526 Crankshaft

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.