Features of the crankshaft and flywheel (VW Passat B4)

The crankshaft is steel, forged, five-bearing, with eight counterweights.

Main journal diameter, mm:

• nominal: 54.00^-0,022_-0,042
• 1st repair size: 53.75^-0,022_-0,042
• 2nd repair size: 53.50^-0,022_-0,042
• 3rd repair size: 53.25^-0,022_-0,042.

Diameter of connecting rod journals, mm:

• nominal: 47.80^-0,022_-0,042
• 1st repair size: 47.55^-0,022_-0,042
• 2nd repair size: 47.30^-0,022_-0,042
• 3rd repair size: 47.05^-0,022_-0,042

Nominal axial clearance of the crankshaft in thrust bearings 0.07-0.17 mm; maximum permissible 0.37 mm.

Nominal clearance between bearing shells and main journals:

• engines "1Y", "1Z", "AFN", "RA" and "SB" 0.03-0.08 mm;
• engines "AAZ" 0.018-0.058 mm.

Maximum permissible:

• engines "1Y", "1Z", "AFN", "RA" and "SB" 0.17 mm;
• engines "AAZ" 0.16 mm.

Main bearing shells are thin-walled steel, with a working surface made of aluminum-tin alloy. The flywheel is cast iron, with a pressed-on toothed rim, is attached to the crankshaft flange with six bolts and can be installed in only one angular position. The permissible axial runout of the flywheel when measured along the circumference of the contact surface with the clutch disk is no more than 0.08 mm.

[View the original on this resource: VWManual]

Checking the technical condition

It is carried out similarly to the instructions in the corresponding section "Petrol 8-valve engines".

Note: When determining the clearances between the liners and the crankshaft journals using a calibrated wire, turn the connecting rod bolts and main bearing cap bolts by 90°.