6/4/2014 Bearing sizes | The VW Bug

http://61vdub.blogspot.com/2012/01/bearing-sizes.html 1/2

8th January 2012

Line Bore Thrust??????? Crank

Std - 65mm Std - 22mm Std - 55mm

1st - 65.5mm 1st - 21mm 1st undersize - .25mm

2nd - 66mm 2nd - 20mm 2nd undersize - .50mm

3rd - 66.5mm 3rd undersize - .75mm

4th - 67mm 4th undersize - 1.00mm (54mm)

Crankshaft Converted To Inches

Mains Rods Conversion MM To Inches

Std - 2.1641 - 2.1649 Std - 2.1646 - 2.1654 .25mm = .010"

1st - 2.1541 - 2.1549 1st - 2.1546 - 2.1554 .50mm = .020"

2nd - 2.1441 - 2.1449 2nd - 2.1446 - 2.1454 .75mm = .030"

3rd - 2.1341 - 2.1349 3rd - 2.1346 - 2.1354 1.00mm = 040"

4th - 2.1241 - 2.1249 4th - 2.1246 - 2.1254

Courtesy of lazy8parts.com [http://lazy8parts.com/] ....with the additions of the mm size

1200cc-1600cc Crankshaft & Bearing Information (May 1960 On)

Std. Rod Journal = 2.164" (54.9656mm)

The Crankshaft Main Bearing Journal closest to the Flywheel is Journal # 1 and is the Thrust Bearing.

Std. Main Journals # 1, # 2, # 3 = 2.164" (55.0mm)

Std. Main Journal # 4 = 1.574" (39.9796mm?)

Journal Bearings # 1 &; 4 are one piece and install on the Crankshaft

Journal Bearings # 2 &; 3 are two piece and install in the case halves

To determine if a 1200cc/1600cc case has been align bored, measure the outside diameter of the rear

main bearing shell:

If the case is Std. The dia = 2.559" (65.0 mm)

If the case has been bored + .020" The dia = 2.579" (65.5 mm)

If the case has been bored + .040" The dia = 2.599" (66.0 mm)

If the case has been bored + .060" The dia = 2.619" (66.5 mm)

If the case has been bored + .080" The dia = 2.639" (67.0 mm)

If you dont have the one piece Rear Main Bearing Shell, you can measure the thickness of one of the # 2

or # 3 Main bearing Halves. (To use this method, you have to know if the Crankshaft the bearing came

from is: Std., .010", .020", etc.; adjust the following dimensions accordingly).

Bearing sizes

6/4/2014 Bearing sizes | The VW Bug

http://61vdub.blogspot.com/2012/01/bearing-sizes.html 2/2

If the Crankshaft is Std. The thickness of the # 2 or # 3 Bearing shell Half in a Standard Case = .2065"

If the case has been bored + .020" The Shell measures .2075" (5.2705 mm)

If the case has been bored + .040" The Shell measures .2085" (5.2959 mm)

If the case has been bored + .060" The Shell measures .2095" (5.3213 mm)

If the case has been bored + .080" The Shell measures .2105" (5.3467 mm)

To determine if a 1200cc/1600cc case thrust has been cut, measure the width of the Case Rear Main

Bearing Saddle:

If the Thrust Bearing is Std. The Width = 0.8655" (21.9837 mm)

If the Thrust Bearing is - .040" The Width = 0.8255" (20.9677 mm)

If the Thrust Bearing is - .080" The Width = 0.7855" (19.9517 mm)

If you are trying to determine what oversize bearings to get for a crankshaft and don't have immediate

access to the case, but have the old crankshaft complete with bearings, you can easily determine if a

1200cc/1600cc case thrust has been cut, by measuring the Thicknessof the "Outer" Rear Main Bearing

Thrust Flange:

If the thrust is Std.

The Outer Rear Thrust Flange thickness is 0.0965" (2.4511 mm)

If the thrust has been cut to -.040"

The Outer Rear Thrust Flange thickness is 0.1365" (3.4671 mm)

If the thrust has been cut to -.080"

The Outer Rear Thrust Flange thickness is 0.1765" (4.4831 mm)

Posted 8th January 2012 by Mike

Labels: aircooled, bearing, size, vw

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