Main Bearing Clearance, Standard and Limit

Cylinder block
Classification codes
Standard:
8 85.975 - 85.985 mm
99 85.985 - 85.995 mm
00 85.995 - 86.005 mm
01 86.005 - 86.015 mm
02 86.015 - 86.025 mm
Oversizes:
7+0.5 86.465 - 86.475 mm
8+0.5 86.475 - 86.485 mm
9+0.5 86.485 - 86.495 mm
0+0.5 86.495 - 86.505 mm

Pistons
General data
Piston clearance, nominal 0.025-0.045 mm
Measurements
R 43 mm
A 3.45 mm
Diameter 78.5 mm
H 56.45 mm

Piston Diameter
Piston diameter is measured at right angles to the gudgeon pin holes, 16 mm from the bottom of the piston.

Important
New pistons are graphite coated, but the coating is not included in the measurement below.

Classification Codes
Standard
8 85.945 - 85.955
99 85.955 - 85.965
00 85.965 - 85.975
01 85.975 - 85.985
02 85.985 - 85.995

Oversizes
7+0.5 86.435 - 86.445
8+0.5 86.445 - 86.455
9+0.5 86.455 - 86.465
0+0.5 86.465 - 86.475

Piston rings
Upper compression ring
Thickness .478-1.490 mm
Working gap in cylinder 0.30-0.50 mm
Lower compression ring
Thickness 1.478-1.490 mm
Working gap in cylinder 0.30-0.50 mm
Scraper ring
Thickness 3.0 mm
Working gap in cylinder 0.40-1.40 mm

Gudgeon Pin
Diameter 20.995 - 21.000 mm
Gudgeon pin in relation to connecting rod Floating bearing

Connecting Rods
Big-end diameter 52.000 - 52.012 mm
Length 148 mm
The difference in weight:
Between connecting rods in the same engine must not exceed 6 g
Through oilway in connecting rod 4 mm

Crankshaft
General data
Crankshaft end float 0.10 - 0.76 mm
Maximum journal out-of-round 0.003 mm
Max. allowable rotational deviation 0.05 mm

Big-End Bearing Journal Diameter
Standard 53.990 - 53.971 mm
First undersize 53.740 - 53.721 mm
Second undersize 53.490 - 53.471 mm

Main Bearing Journal Diameter
Standard mm 67.980 - 67.996 mm
First undersize mm 67.730 - 67.746 mm
Second undersize mm 67.480 - 67.496 mm

Main bearing clearance 0.014 - 0.043 mm
Big-end bearing clearance 0.013 - 0.061 mm

Main bearings
Standard size
Marking cyl. block 0
Size main bearing seat 72.0000 - 72.0065 mm
Marking crankshaft Green
Size main bearing journals 67.980 - 67.988 mm
Main bearing cup in cylinder block Brown
Bearing cup in bearing cap Green
Resulting bearing clearance 0.0160 - 0.0425 mm
Marking crankshaft Brown
Size main bearing journals 67.988 - 67.996 mm
Main bearing cup in cylinder block Brown
Bearing cup in bearing cap Brown
Resulting bearing clearance 0.0140 - 0.0405 mm

Marking cyl. block 1
Size main bearing seat 72.0065 - 72.0130 mm
Marking crankshaft Green
Size main bearing journals 67.980 - 67.988 mm
Main bearing cup in cylinder block Green
Bearing cup in bearing cap Green
Resulting bearing clearance 0.0165 - 0.0430 mm
Marking crankshaft Brown
Size main bearing journals 67.988 - 67.996 mm
Main bearing cup in cylinder block Green
Bearing cup in bearing cap Brown
Resulting bearing clearance 0.0145 - 0.0140 mm

Undersize -0.25 mm
Marking cyl. block 0
Size main bearing seat 72.0000 - 72.0065 mm
Marking crankshaft -
Size main bearing journals 67.730 - 67.738 mm
Main bearing cup in cylinder block Brown/Blue
Bearing cup in bearing cap Green/Blue
Resulting bearing clearance 0.0160 - 0.0425 mm
Marking crankshaft -
Size main bearing journals 67.738 - 67.746 mm
Main bearing cup in cylinder block Brown/Blue
Bearing cup in bearing cap Brown/Blue
Resulting bearing clearance 0.0140 - 0.0405 mm

Marking cyl. block 1
Size main bearing seat 72.0065 - 72.0130 mm
Marking crankshaft -
Size main bearing journals 67.730 - 67.738 mm
Main bearing cup in cylinder block Green/Blue
Bearing cup in bearing cap Green/Blue
Resulting bearing clearance 0.0165 - 0.0430 mm
Marking crankshaft -
Size main bearing journals 67.738 - 67.746 mm
Main bearing cup in cylinder block Green/Blue
Bearing cup in bearing cap Brown/Blue
Resulting bearing clearance 0.0145 - 0.0410 mm

Undersize -0.50
Marking cyl. block 0
Size main bearing seat 72.0000 - 72.0065 mm
Marking crankshaft -
Size main bearing journals 67.480 - 67.488 mm
Main bearing cup in cylinder block Brown/White
Bearing cup in bearing cap Green/White
Resulting bearing clearance 0.0160 - 0.0425 mm
Marking crankshaft -
Size main bearing journals 67.488 - 67.496 mm
Main bearing cup in cylinder block Brown/White
Bearing cup in bearing cap Brown/White
Resulting bearing clearance 0.0140 - 0.0405 mm

Marking cyl. block 1
Size main bearing seat 72.0065 - 72.0130 mm
Marking crankshaft -
Size main bearing journals 67.480 - 67.488 mm
Main bearing cup in cylinder block Green/White
Bearing cup in bearing cap Green/White
Resulting bearing clearance 0.0165 - 0.0430 mm
Marking crankshaft -
Size main bearing journals 67.488 - 67.496 mm
Main bearing cup in cylinder block Green/White
Bearing cup in bearing cap Brown/White
Resulting bearing clearance 0.0145 - 0.0410 mm

Bearing Clearance
Permitted resulting bearing clearance 0.0140 - 0.0430 mm

Bearing Shell Thickness By Color
Brown:
Bearing thickness 1.989-1.995 mm
Green:
Bearing thickness 1.995-2.001 mm
Brown/Blue
Bearing thickness 2.114-2.120 mm
Green/Blue:
Bearing thickness 2.120-2.126 mm
Brown/White:
Bearing thickness 2.239-2.245 mm
Green/White:
Bearing thickness 2.245-2.251 mm

Warning: Always measure the bearing clearance before assembling the engine.

Important: The main bearing halves in bearing caps 2 and 3 have no oilway.