Engine Specs - S65 Rod Bearings
Contents
Rod Journal Dimensions
| Crankshaft Rod Journals | Metric Dimensions | SAE (Inch) Dimensions |
|---|---|---|
| Rod Journal Dimensions | 51.9811mm | 2.04650 inch |
| Rod Journal Variance | 51.9786 - 51.9887 mm | 2.04640 - 2.04680 inch |
| Rod Journal Tolerance | -0.0025, +0.0076 mm | -0.00010, +0.00030 inch |
Bearings Specification, Dimensions, Clearance
OEM 088/089 Bearings
Production and Composition
BMW "088/089" bearings were the factory production bearings between 2007 to mid-2010. When the EU mandated the removal from lead in automotive bearings, BMW discontinued these bearings.
The composition is a standard babbit lead/copper bearing. They are soft faced, and easy on the crankshaft.
Manufacturer: Clevite. Clevite logo is seen on the back of the bearings.
Dimensions
| Bearing Dimensions (088/089 Bearings) | Metric Dimensions | SAE (Inch) Dimensions |
|---|---|---|
| Nominal Bearing Thickness (Top, Blue) | 2.0028 mm | 0.07885 inch |
| Nominal Bearing Thickness (Bottom, Red) | 1.9977 mm | 0.07865 inch |
| Bearing Thickness Variance (Top, Blue) | 2.0015 - 2.0041 mm | 0.07880 - 0.07890 inch |
| Bearing Thickness Variance (Bottom, Red) | 1.9964 - 2.0015 mm | 0.07860 - 0.07880 inch |
| Bearing Tolerance (Top, Blue) | -0.0013 - 0.0013 mm | -0.00005 - +0.00005 inch |
| Bearing Tolerance (Bottom, Red) | -0.0013 - 0.0038 mm | -0.00005 - +0.00015 inch |
Bearing Clearance Specifications
| Con Rod Clearance (088/089 Bearings) (1) | Metric Dimensions | SAE (Inch) Dimensions |
|---|---|---|
| Rod + Bearing Dimensions | 52.0179 mm | 2.04795 inch |
| Rod + Bearing Variance (1) | 52.0154 - 52.0192 mm | 2.04785 - 2.04800 inch |
| Nominal Rod Bearing Clearance | 0.0368 mm | 0.00145 inch |
| Bearing Clearance Variance (1) | 0.0343 - 0.0381 mm | 0.00135 - 0.00150 inch |
| Bearing Clearance Tolerance | -0.0025 - +0.0013 mm | -0.00010 - +0.00005 inch |
| Bearing Clearance per Journal inch | 0.00071 inch/inch | |
| Bearing Clearance per Journal Inch Variance (1) | 0.00066 - 0.00073 inch/inch | |
| Bearing Eccentricity | 0.0216 mm | 0.00085 inch |
| Bearing Eccentricity Variance | 0.0178 - 0.0229 mm | 0.00070 - 0.00090 inch |
| Bearing Eccentricity Tolerance | -0.0038 - +0.0013 mm | -0.00015 - +0.00005 inch |
OEM 702/703 Bearings
Production and Composition
EU mandates against lead/copper bearings began in 2011. However, S65 engines have been seen with mid-2010 production dates having these newer 702/703 bearings. These bearings remained in production until the end of S65 production in 2013.
The new 702/703 bearings are made from tin/aluminum composition. BMW increased the clearance slightly over the 088/089 bearings and increased the eccentricity as well. But this improvement in clearance and eccentricity came at a price. The 702/703 bearings are substantially harder than the 088/089 bearings they replaced. As a consequence, then a bearing is spun, it tends to cause more damage to the crankshaft in the process.
Manufacturer: King (believed to be King, but this is unconfirmed).
Dimensions
| Bearing Dimensions (702/703 Bearings) | Metric Dimensions | SAE (Inch) Dimensions |
|---|---|---|
| Nominal Bearing Thickness (Top, Blue) | 1.9977 mm | 0.07865 inch |
| Nominal Bearing Thickness (Bottom, Red) | 1.9939 mm | 0.07850 inch |
| Bearing Thickness Variance (Top, Blue) | 1.9977 - 1.9990 mm | 0.07865 - 0.07870 inch |
| Bearing Thickness Variance (Bottom, Red) | 1.9939 - 1.9952 mm | 0.07850 - 0.07855 inch |
| Bearing Tolerance (Top, Blue) | 0.0000 - 0.0013 mm | 0.00000 - +0.00005 inch |
| Bearing Tolerance (Bottom, Red) | 0.0000 - 0.0013 mm | 0.00000 - +0.00005 inch |
Bearing Clearance Specifications
| Con Rod Clearance (702/703 Bearings) | Metric Dimensions | SAE (Inch) Dimensions |
|---|---|---|
| Rod + Bearing Dimensions | 52.0243 mm | 2.04820 inch |
| Rod + Bearing Variance | 52.0230 - 52.0294 mm | 2.04815 - 2.04840 inch |
| Nominal Rod Bearing Clearance | 0.0432 mm | 0.00170 inch |
| Bearing Clearance Variance | 0.0419 - 0.0483 mm | 0.00165 - 0.00190 inch |
| Bearing Clearance Tolerance | -0.0089 - +0.0076 mm | -0.00035 - +0.00030 inch |
| Bearing Clearance per Journal inch | 0.00083 inch/inch | |
| Bearing Clearance per Journal Inch Variance | 0.00081 - 0.00093 inch/inch | |
| Bearing Eccentricity | 0.0508 mm | 0.00200 inch |
| Bearing Eccentricity Variance | 0.0444 - 0.0584 mm | 0.00175 - 0.00230 inch |
| Bearing Eccentricity Tolerance | -0.0063 - +0.0076 mm | -0.00025 - +0.00030 inch |
Calico Coated Bearings
Production and Composition
Calico coated bearings start life as standard 072/703 bearings. Calico adds their CT-1 coating to the surface of the bearing. The coating adds a slight thickness, thereby decreasing bearing clearance. The thickness to each shell is estimated by Calico between 0.0002 - 0.0004 inch.
Dimensions
Will post when available.
Bearing Clearance Specifications
