1200cc-1600cc Crankshaft & Bearing Information (May 1960 On)
Std. Rod Journal = 2.164"
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"
Std. Main Journal # 4 = 1.574"
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"
If the case has been bored + .020" The dia = 2.579"
If the case has been bored + .040" The dia = 2.599"
If the case has been bored + .060" The dia = 2.619"
If the case has been bored + .080" The dia = 2.639"
If you donít 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).
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"
If the case has been bored + .040" The Shell measures .2085"
If the case has been bored + .060" The Shell measures .2095"
If the case has been bored + .080" The Shell measures .2105"
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"
If the Thrust Bearing is - .040" The Width = 0.8255"
If the Thrust Bearing is - .080" The Width = 0.7855"
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 Thickness of the "Outer" Rear Main Bearing Thrust Flange:
If the thrust is Std.
The Outer Rear Thrust Flange thickness is 0.0965"
If the thrust has been cut to -.040"
The Outer Rear Thrust Flange thickness is 0.1365"
If the thrust has been cut to -.080"
The Outer Rear ThrustFlange thickness is 0.1765"
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