Engine Connecting Rod Bearing Size Chart(For All Vehicle Brands)

The connecting rod bearing is a crucial component in an internal combustion engine. It supports the crankshaft at the big end of the connecting rod, allowing the crankshaft to rotate smoothly under high load and speed while maintaining proper oil clearance.

Selecting the correct bearing size is essential to engine longevity and performance.

Engine Connecting Rod Bearing Size Chart

Toyota

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
1ZZ-FE	1.484 – 1.488	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
2ZZ-GE	1.488 – 1.492	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
3F-E	1.492 – 1.496	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
1GR-FE	1.500 – 1.504	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
2TR-FE	1.500 – 1.504	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Honda

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
B16, B18	1.771 – 1.775	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
K20, K24	1.780 – 1.790	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
F20C	1.775 – 1.785	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
D-Series	1.765 – 1.775	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
H-Series	1.770 – 1.780	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Chevrolet / GM

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
Small Block 350	2.100 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Small Block 400	2.125 – 2.150	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
LS1 / LS2 / LS3	2.099 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
5.3L Vortec	2.100 – 2.120	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Duramax Diesel LB7	2.300 – 2.400	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Related Car Engine Oil Capacity Chart(Car Model A to Z)

Ford

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
302 Windsor	2.100 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
351 Windsor	2.100 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
5.0L Coyote	2.099 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
6.0L Powerstroke Diesel	2.300 – 2.400	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
7.3L Powerstroke Diesel	2.300 – 2.400	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Nissan

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
SR20DET	1.968 – 1.972	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
KA24DE	1.975 – 1.984	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
RB25DET	1.984 – 1.992	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
VQ35DE	1.992 – 2.000	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
VQ37VHR	2.000 – 2.010	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Related Engine VIN Number Decoding Chart(For All Vehicle Brands)

Mitsubishi

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
4G63	1.968 – 1.975	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
6G72	1.992 – 2.000	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
4B11	1.968 – 1.984	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
4G63T	1.968 – 1.984	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
4G64	1.984 – 2.000	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Subaru

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
EJ20	1.968 – 1.980	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
EJ25	1.980 – 1.992	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
FB20	1.968 – 1.980	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
FA20	1.980 – 1.992	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
EZ30	1.992 – 2.004	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Related Year to VIN Chart(From 1980–2069)

Mazda

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
B6	1.850 – 1.860	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
BP	1.860 – 1.870	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
FS	1.870 – 1.880	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
KL	1.880 – 1.890	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
MZR	1.890 – 1.900	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

BMW

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
M50	1.850 – 1.860	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
M52	1.860 – 1.870	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
N52	1.870 – 1.880	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
S54	1.880 – 1.890	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
B58	1.890 – 1.900	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Related Engine Oil Compatibility Chart(A Detailed Guide)

Mercedes-Benz

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
M102	1.850 – 1.860	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
M104	1.860 – 1.870	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
OM601	1.875 – 1.885	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
OM602	1.885 – 1.895	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
M271	1.890 – 1.900	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Volkswagen / Audi

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
1.8T	1.850 – 1.860	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
2.0T FSI	1.860 – 1.870	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
2.0 TDI	1.870 – 1.880	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
VR6	1.880 – 1.890	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
3.6 FSI	1.890 – 1.900	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Related Engine Torque Calculator

Hyundai / Kia

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
Theta / Theta II	1.850 – 1.860	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Nu	1.860 – 1.870	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Gamma	1.870 – 1.880	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Lambda	1.880 – 1.890	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Smart GDI	1.890 – 1.900	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Volvo

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
B230	1.850 – 1.860	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
B5254	1.860 – 1.870	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
B5244	1.870 – 1.880	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
D5 Diesel	1.950 – 1.970	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
T5 / T6 Turbo	1.880 – 1.890	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Related Engine Displacement Calculator

Chrysler / Dodge

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
2.7L V6	1.968 – 1.980	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
3.5L V6	1.980 – 1.992	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
5.7 HEMI	2.100 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
6.1 HEMI	2.100 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
6.4 HEMI	2.100 – 2.125	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Diesel Engines (Cummins / GM / Ford)

Engine / Series	Standard Journal Dia (in)	Undersize Options (in)	Oversize Options (in)	Typical Oil Clearance (in)
Cummins 5.9L 12V	2.300 – 2.400	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Cummins 6.7L	2.350 – 2.450	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
GM Duramax LB7	2.300 – 2.400	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Ford 6.0L Powerstroke	2.300 – 2.400	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025
Ford 7.3L Powerstroke	2.300 – 2.400	-0.002, -0.005, -0.010	+0.002	0.0015 – 0.0025

Related Car Engine Oil Color Chart(Color That Signals Immediate Danger)

Color-Coded Bearing Selection

Color	Bearing ID (mm)	Crank Journal Diameter (mm)	Target Oil Clearance (mm)
White	36.000	35.970 – 35.990	0.030
Red	36.010	35.980 – 36.000	0.010 – 0.030
Blue	36.020	35.990 – 36.010	0.010 – 0.030
Green	36.030	36.000 – 36.020	0.010 – 0.030
Yellow	36.040	36.010 – 36.030	0.010 – 0.030

Generic Connecting Rod Bearing Size Chart

Bearing Type	Standard Journal Diameter (in)	Undersize Bearing (in)	Oversize Bearing (in)	Common Oil Clearance (in)
Connecting Rod Bearing	1.850	1.848 (-0.002)	1.852 (+0.002)	0.0015 – 0.0025
Connecting Rod Bearing	1.845	1.843 (-0.002)	1.847 (+0.002)	0.0015 – 0.0025
Connecting Rod Bearing	1.840	1.838 (-0.002)	1.842 (+0.002)	0.0015 – 0.0025
Connecting Rod Bearing	1.835	1.833 (-0.002)	1.837 (+0.002)	0.0015 – 0.0025
Connecting Rod Bearing	1.830	1.828 (-0.002)	1.832 (+0.002)	0.0015 – 0.0025

Why Bearing Sizes Matter

When rebuilding or assembling an engine, it is necessary to measure:

• Crankshaft journal diameter
• Connecting rod bore inside diameter

These measurements determine the correct bearing size. Bearings typically come in:

• Standard size (STD)
• Undersize (e.g., 0.002″, 0.005″, 0.010″)
• Oversize (less common)

Correct bearing size ensures proper oil clearance. Oil clearance is the small gap between the crank journal and bearing, where oil forms a protective film. Typical clearances are very small, often around 0.0015″ to 0.0025″ for rod bearings in most automotive engines.

How Connecting Rod Bearing Sizes Are Defined

Bearings are designed to maintain proper oil clearance. Manufacturers often mark bearings using:

• Numbers, letters, or color codes
• Size groups corresponding to inner diameters or thicknesses

Undersized bearings are used when crankshaft journals are ground smaller. Accurate measurement is done using micrometers, bore gauges, or plastigauge to check oil clearance after assembly.

Steps to Select Connecting Rod Bearings

1. Measure crankshaft journals with a micrometer.
2. Measure the rod bore inside diameter.
3. Determine bearing group or size code based on the manufacturer’s chart.
4. Select STD or undersized bearing according to measurements.
5. Check oil clearance with plastigauge after assembly.

Proper installation prevents bearing failure, low oil pressure, or crankshaft damage.

Tips for Engine Rebuilders

• Clearances: Target oil clearance is usually around 0.001″ per inch of journal diameter.
• Markings: Letters or numbers on rods correspond to bearing size; always cross-check with the service manual.
• Undersized bearings: Used when journals are machined smaller; oversize bearings are rarely required.
• Avoid mixing sizes: Bearings in a set must match corresponding journals for all rods.