Question 1

How can the running clearance check on the crankshaft be performed using bearing shells on Audi A3?

Accepted Answer

The running clearance check can be done using original bearing shells but it is better to fit a new bearing set for more definitive results, in which case clean all the protective grease off the shells with a paraffin. Clean the back of the bearing shells and the location of the bearings in the cylinder block/crankcase AND the main bearing caps. Position the cylinder block on a clean work surface with the crankcase uppermost, pushing the bearing shells into their position making sure to align the tab in each shell with the notch and that the oil holes are lined up, being careful not to touch the bearing surfaces. Working on a crankshaft end float control: Fit the crankshaft end float control thrust washer halves to either side of the No 3 bearing location, using a little bit of grease to hold them in place on the in the correct seated position, i.e. oil grooves facing outwards. It is possible to check the running clearance, but it requires the use of internal micrometers or expanding calipers. refit the main bearing caps with bearing shells in place tighten the original cap retaining bolts to the specified torque to measure the internal diameter of each assembled pair of bearing shells, and subtract the diameter of the crankshaft journals to determine the running clearance of the main bearing. Carefully remove the crankshaft from the cylinder block, clean the bearing shell surfaces and where appropriate refit the crankshaft speed/position sensor wheel, tightening the bolts to the specified torque in the correct orientation. Liberally coat the bearing shells in the crankcase in clean engine oil with the bearing shells correctly seated and lower the crankshaft into position (No.1 cylinder crankpin at BOC) taking care not to damage the sensor wheel. Lubricate the lower of bearing shells in the main bearing caps and make sure the thrust washer halves are properly seated. Fit the main bearing caps in the correct sequence i.e. keeping No 1 bearing cap at the end of the timing belt, hand tighten the bolts and then tighten them to the specified value of torque i.e. work from the center bearing cap and outward. Check that the crankshaft rotates freely by hand, check the bearing running clearances once again if resistance is felt, check for crankshaft endfloat, make sure that this is within spec if new thrust washers have been fitted. Refit the pistons and connecting rods/con. rods to Crankshaft and proceed according to type of Engine: SOHC Petrol refit Crankshaft Oil Seal housings, Flywheel / Driveplate, Oil pump and Oil pick up pipe, sump and Oil baffle plate, Crankshaft Sprocket and Timing belt, Diesel Engines refit Crankshaft Oil seal housings, Flywheel / driveplate, Oil pump and Oil pick up pipe, sump and Oil Baffle plate, Crankshaft Sprocket and Timing Belt.

Question 2

What steps are involved in removing and reinstalling a crankshaft on Audi A4?

Accepted Answer

Removal of the crankshaft is only possible when the engine is removed out of the automobile, though it is assumed that the flywheel, crankshaft pulley, timing chain, oil pan, oil pump, oil filter, balance shaft assembly (on four-cylinder and 3.0 liter V6 models) and piston/connecting rod assemblies have been removed. Measure the crankshaft endplay at the dial indicator prior to removal aligned with the crankshaft. Lever the crankshaft out, adjust the indicator to zero, then lever it in the opposite direction to verify the reading, a normal endplay is between 0.003 and 0.010 inch. Where there is a lack of a dial indicator, clearance can be found with the help of feeler gauges. The main bearing cap bolts should be loosened step by step and then the caps can be loosened by lightly tapping them with a soft hammer, after which they should be removed. With care, remove the crankshaft, preferably with help and refit the main bearing caps with the arrows towards the front. To install, make sure that the engine block and crankshaft are clean and checked. Set the block in an inverted position, and wipe the bearing surfaces. Install new upper main bearing inserts making sure that the oil holes fit, install the lower inserts in the caps. Measure the main bearing oil clearance with Plastigage, the value of which must be between 0.0015 and 0.0023 inch. In case of inappropriate clearance, check the cleanliness and you can take into consideration alternative bearing sizes. After wiping out Plastigage residue, wipe the faces of bearing inserts and place a layer of grease or assembly lube on them before replacing the crankshaft. Install main bearing caps, lubricate bolt threads with clean engine oil, and screw in that order. Re-check crankshaft endplay, turn crankshaft and verify it moves freely and then replace new rear main oil seal.

Genuine Audi Crankshaft

35 Crankshafts found

Audi Crankshaft Part Number: 026-105-101-R

Audi Crankshaft Part Number: 058-105-019-C

Audi Crankshaft Part Number: 06A-105-021-BN

Audi Crankshaft Part Number: 079-105-019-F

Audi Crankshaft Part Number: 034-105-021-K

Audi Crankshaft Part Number: 06A-105-021-BC

Audi Crankshaft Part Number: 034-105-101-S

Audi Crankshaft Part Number: 022-105-101-A

Audi Crankshaft Part Number: 06L-105-101-F

Audi Crankshaft Part Number: 06K-105-101-A

Audi Crankshaft Part Number: 06A-105-021-BP

Audi Crankshaft Part Number: 03L-105-021-C

Audi Crankshaft Part Number: 078-105-101-AB

Audi Crankshaft Part Number: 07K-105-101-P

Audi Crankshaft Part Number: 06C-105-019-C

Audi Crankshaft Part Number: 077-105-101-BH

Audi Crankshaft Part Number: 06M-105-019-AK

Audi Crankshaft Part Number: 06E-105-101-AK

Audi Crankshaft Part Number: 079-105-101-AC

Audi Crankshaft Part Number: 03H-105-101

Audi Crankshaft

Audi Crankshaft Parts and Q&A

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