Difference between revisions of "Engine Specs -S65/S85 Main Bearings"

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== Main Bearing Color Selection ==
 
== Main Bearing Color Selection ==
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To use this table, measure your crankshaft main journals.  Match the journal diameter with the sizes in Columns three or four (metric or SAE).  Choose the bearing color from column-1 (bottom shell) and column-2 (top shell).<p></p>
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S65/S85 main bearings are available in three different size thicknesses.  These different thicknesses are differentiated by color codes on the bearing shells.  The three color codes are Violet (thickest), Green (nominal), and Yellow (thinnest).  By mixing and matching the main bearing shells, it's possible to adjust the clearance in approximately 0.00012 inch increments. BMW still doesn't tell us the bearing clearance target. However, they do tell us which bearings to use for what size main journal.<p></p>
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There are three colors, giving six different possible combinations. To use this table, measure your crankshaft main journals.  Match the journal diameter with the sizes in Columns three or four (metric or SAE).  Choose the bearing color from column-1 (bottom shell) and column-2 (top shell). Here's the possible combinations for a given main bearing journal size:  <p></p>
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{| class = "diyTable bearingHist"
 
{| class = "diyTable bearingHist"
 
   !Bottom Shell
 
   !Bottom Shell
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   |Green
 
   |Green
 
   |59.977
 
   |59.977
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   |2.3613
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   |2.36130
 
   
 
   
 
  |-
 
  |-
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   |Yellow
 
   |Yellow
 
   |59.982
 
   |59.982
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   |2.3615
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   |2.36150
 
   
 
   
 
  |-
 
  |-
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   |Yellow
 
   |Yellow
 
   |Yellow
 
   |Yellow
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   |59.99
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   |59.990
 
   |2.36181
 
   |2.36181
 
  |}
 
  |}

Latest revision as of 22:37, 10 January 2016


Main Journals & Bearing Clearance

Crankshaft Main Journals & Bearings Metric Dimensions SAE (Inch) Dimensions
Main Journal Dimensions 59.9758 mm 2.36125 inch
Main Journal Variance 59.9694 - 59.9821 mm 2.36100 - 2.36150 inch
Main Journal Tolerance -0.0063, +0.0063 mm -0.00025, +0.00025 inch
Bed Plate + Bearing Dimensions 60.0164 mm 2.36285 inch
Bed Plate + Bearing Variance 60.0126 - 60.0202 mm 2.36270 - 2.36300 inch
Nominal Main Bearing Clearance 0.0406 mm 0.00160 inch
Bearing Clearance Variance 0.0305 - 0.0508 mm 0.00120 - 0.00200 inch
Bearing Clearance Tolerance -0.0102, +0.0102 mm -0.00040, +0.00040 inch

Main Bearing Part Numbers

BMW Part Number Description Location Color Standard Size Bearings Application
11 21 7 841 610 Main Bearing Shell 1-4 Top Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44
11 21 7 841 606 Main Bearing Shell 1-4 Bottom Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44
11 21 7 841 618 Main Guide Bearing Shell 5 Top Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44
11 21 7 841 614 Main Guide Bearing Shell 5 Bottom Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44

Main Bearing Color Selection

S65/S85 main bearings are available in three different size thicknesses. These different thicknesses are differentiated by color codes on the bearing shells. The three color codes are Violet (thickest), Green (nominal), and Yellow (thinnest). By mixing and matching the main bearing shells, it's possible to adjust the clearance in approximately 0.00012 inch increments. BMW still doesn't tell us the bearing clearance target. However, they do tell us which bearings to use for what size main journal.

There are three colors, giving six different possible combinations. To use this table, measure your crankshaft main journals. Match the journal diameter with the sizes in Columns three or four (metric or SAE). Choose the bearing color from column-1 (bottom shell) and column-2 (top shell). Here's the possible combinations for a given main bearing journal size:

Bottom Shell Top Shell Metric SAE
Violet Violet 59.971 2.36106
Violet Violet 59.972 2.36110
Violet Violet 59.973 2.36114
Violet Green 59.974 2.36118
Violet Green 59.975 2.36122
Violet Green 59.976 2.36126
Green Green 59.977 2.36130
Green Green 59.978 2.36134
Green Green 59.979 2.36138
Green Green 59.980 2.36142
Green Yellow 59.981 2.36146
Green Yellow 59.982 2.36150
Green Yellow 59.983 2.36154
Yellow Yellow 59.984 2.36157
Yellow Yellow 59.985 2.36161
Yellow Yellow 59.986 2.36165
Yellow Yellow 59.987 2.36169
Yellow Yellow 59.988 2.36173
Yellow Yellow 59.989 2.36177
Yellow Yellow 59.990 2.36181

Main Bearing History

The following is the main bearing history of the "Green" bearings. Yellow and Violate bearings follow an identical pattern, but with their respective part numbers. Maybe if I get some time, I'll add them to this list.

BMW Part Number Description Location Color Standard Size Bearings Application Prod. Start Prod. End Superceded By
11 21 7 836 532 Main Bearing Shell Top Green 60.00 mm (+0.00 mm) S85B50 Sep-04 Feb-08 11 21 7 841 489
11 21 7 836 517 Main Guide Bearing Shell Top Green 60.00 mm (+0.00 mm) S85B50 Sep-04 Feb-08 11 21 7 841 499
11 21 7 836 539 Main Bearing Shell Bottom Green 60.00 mm (+0.00 mm) S85B50 Sep-04 Feb-08 11 21 7 841 484
11 21 7 836 524 Main Guide Bearing Shell Bottom Green 60.00 mm (+0.00 mm) S85B50 Sep-04 Feb-08 11 21 7 841 494
11 21 7 841 489 Main Bearing Shell Top Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Sep-07 Jul-11 11 21 7 841 610
11 21 7 841 499 Main Guide Bearing Shell Top Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Sep-07 Dec-08 11 21 7 841 618
11 21 7 841 484 Main Bearing Shell Bottom Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Sep-07 Apr-11 11 21 7 841 606
11 21 7 841 494 Main Guide Bearing Shell Bottom Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Sep-07 Jan-09 11 21 7 841 614
11 21 7 841 610 Main Bearing Shell Top Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Nov-08 Present
11 21 7 841 618 Main Guide Bearing Shell Top Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Dec-08 Present
11 21 7 841 606 Main Bearing Shell Bottom Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Nov-08 Present
11 21 7 841 614 Main Guide Bearing Shell Bottom Green 60.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Nov-08 Present

Supporting Measurements

Main-1 Main-2 Main-3 Main-4 Main-5 Bearing-1 Bearing-2 Bearing-3 Bearing-4 Bearing-5 Clear-1 Clear-2 Clear-3 Clear-4 Clear-5
Crank-1 2.36145 2.36145 2.36130 2.36150 2.36140 2.36270 2.36270 2.36300 2.36300 2.36290 0.00125 0.00125 0.00170 0.00150 0.00150
Crank-2 2.36110 2.36110 2.36120 2.36100 2.36120 2.36270 2.36270 2.36300 2.36300 2.36290 0.00160 0.00160 0.00180 0.00200 0.00170


Min Nominal Max Min Dev. Max Dev.
Journal 2.36100 2.36125 2.36150 -0.00025 0.00025
Bearing 2.36270 2.36285 2.36300 -0.00015 0.00015
Clearance 0.00120 0.00160 0.00200 -0.00040 0.00040
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