Engine Specs - S54 Rod Bearings

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Rod Journal Dimensions

Crankshaft Rod Journals Metric Dimensions SAE (Inch) Dimensions
Rod Journal Dimensions 48.9830mm 1.92846 inch
Rod Journal Variance 48.9750 - 48.9910 mm 1.92815 - 1.92878 inch
Rod Journal Tolerance -0.0080, +0.0080 mm -0.00031, +0.00031 inch

Bearings Specification, Dimensions, Clearance

OEM 439/440 Bearings

Production and Composition

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.
Composition: Trimetal lead/copper

Dimensions

Bearing Dimensions (439/440 Bearings) Metric Dimensions SAE (Inch) Dimensions
Bearing Width (Blue, Red) 15.8140 mm 0.62260 inch
Nominal Bearing Thickness (Top, Blue) 1.9990 mm 0.07870 inch
Nominal Bearing Thickness (Bottom, Red) 1.9939 mm 0.07850 inch
Bearing Thickness Variance (Top, Blue) 1.9964 - 2.0041 mm 0.07860 - 0.07890 inch
Bearing Thickness Variance (Bottom, Red) 1.9939 - 1.9939 mm 0.07850 - 0.07850 inch
Bearing Tolerance (Top, Blue) -0.0025 - 0.0051 mm -0.00010 - +0.00020 inch
Bearing Tolerance (Bottom, Red) 0.0000 - 0.0000 mm 0.00000 - +0.00000 inch


Bearing Clearance Specifications

Con Rod Clearance (439/440 Bearings) Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 49.0364 mm 1.93057 inch
Rod + Bearing Variance 49.0271 - 49.0411 mm 1.93020 - 1.93075 inch
Nominal Rod Bearing Clearance 0.0511 mm 0.00201 inch
Bearing Clearance Variance 0.0361 - 0.0660 mm 0.00142 - 0.00260 inch
Bearing Clearance Tolerance -0.0150 - +0.0150 mm -0.00059 - +0.00059 inch
Bearing Clearance per Journal inch   0.00104 inch/inch
Bearing Clearance per Journal Inch Variance 0.00074 - 0.00135 inch/inch
Bearing Eccentricity 0.0127 mm 0.00050 inch
Bearing Eccentricity Variance 0.0076 - 0.0292 mm 0.00030 - 0.00115 inch
Bearing Eccentricity Tolerance -0.0051 - +0.0165 mm -0.00020 - +0.00065 inch


Clearance Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6
5.00 1.93200 1.93280 1.93230 1.93260 1.93245 1.93285
19.75 1.93105 1.93135 1.93120 1.93130 1.93110 1.93100
45.00 1.93065 1.93065 1.93065 1.93025 1.93040 1.93040
90.00 1.93075 1.93070 1.93060 1.93020 1.93065 1.93050
135.00 1.93045 1.93060 1.93070 1.93040 1.93060 1.93060
160.25 1.93145 1.93120 1.93100 1.93135 1.93120 1.93130
175.00 1.93260 1.93240 1.93180 1.93260 1.93200 1.93200

Note: Clearance measurements are based on nominal rod journal diameter of 1.9285 inch.

Eccentricity Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6
5.00 0.00125 0.00210 0.00170 0.00240 0.00180 0.00235
19.75 0.00030 0.00065 0.00060 0.00110 0.00045 0.00050
45.00 -0.00010 -0.00005 0.00005 0.00005 -0.00025 -0.00010
90.00 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
135.00 -0.00030 -0.00010 0.00010 0.00020 -0.00005 0.00010
160.25 0.00070 0.00050 0.00040 0.00115 0.00055 0.00080
175.00 0.00185 0.00170 0.00120 0.00240 0.00135 0.00150


BMW 439-440 Eccentricity.jpg
Bearing Eccentricity: BMW Factory 439/440 rod bearings

BE Bearings

Production and Composition

Manufacturer: Clevite
Composition: Trimetal lead/copper
Coating: Clevite TriArmor®
Part Number: SP1527HK
Target Market: Extra clearance OEM replacement

BE Bearings are a full custom rod bearing designed and manufactured by Clevite. Clevite manufactures the bearings to the BE Bearing specifications.

The composition is a standard babbit lead/copper bearing with additional Clevite Tri-Armor non-friction coating. They are soft faced, and easy on the crankshaft, and compatible with stop-start vehicles.

Lead/Copper, Tri-Metal design Tri-Metal, lead/copper are considered the world's best bearings.  The steel backing is coated with copper, then topped with a soft lead.  The lead is embeddable, meaning small particles can embed themselves in the lead without causing any damage to the crankshaft.  Look in the best automotive engines, and you're likely to find a Tri-Metal bearing design.

Used Oil Analysis (UOA) BE Bearings chose the Tri-Metal lead/copper bearings to track the metals in the UOA like Blackstone.  BE Bearings wanted their bearings to show up in the UOA, and another reason they chose the Tri-Metal, lead/copper design.

Clevite TriArmor® coating For increased bearing life and durability, BE Bearings chose to add the Clevite TriArmor coating.  TriArmor is a low-friction coating offered directly from Clevite with a Clevite warranty.  It's ideally suited for start-stop engines and protects the crankshaft and bearings at critical times of low oil pressure and/or during start up.

Picture Description

BEB-SP1534HK.jpg