Check the crankshaft main bearing oil clearance.
To check main bearing-to-journal oil clearance, remove the main bearings.
Clean each main journal and bearing half with a clean shop tower.
Place one strip of plastigage across each main journal.
Reinstall the bearings and bolts in the following method by tightening to the specified torque.
Tightening torque :
17.7 ~ 21.6 N.m (1.8 ~ 2.2 kgf.m, 13.0 ~ 15.9 lb-ft) + 103 ~ 105°
Do not turn the crankshaft.
Always use new crankshaft main bearing cap bolts. Crankshaft main bearing cap bolts are torque-to-yield bolts designed to be permanently elongated beyond the state of elasticity when torqued, so if the bolts are removed and reused, it may cause the bolts to break or fail to maintain clamping force.
Remove the cap and bearing again, and measure the widest part of the plastigage.
Standard oil clearance :
0.006 ~ 0.024 mm (0.0002 ~ 0.0009 in)
If the plastigage measures too wide or too narrow, remove the upper half of the bearing, install a new, complete bearing with the same color mark (select the color as shown in the next column), and recheck the clearance.
Do not file, shim, or scrape the bearings or the caps to adjust clearance.
If the plastigage shows that the clearance is still incorrect, try the next larger or smaller bearing (the color listed above or below that one), and check clearance again.
If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.
If the marks are indecipherable due to an accumulation of dirt and dust, instead of scrubbing them with a wire brush or scraper, clean with solvent or detergent only.
Cylinder block crankshaft journal bore mark location
Letters are stamped on the front face of block to mark the size of each of the 5 main journal bores.
Use them, and the numbers or bar stamped on the crank (marks for main journal size), to choose the correct bearings.
Grade | Mark | Cylinder Block Crankshaft journal Bore Inner Diameter |
a | A | 52.000 ~ 52.006mm (2.0472 ~ 2.0475in) |
b | B | 52.006 ~ 52.012mm (2.0475 ~ 2.0477in) |
c | C | 52.012 ~ 52.018mm (2.0477 ~ 2.0480in) |
Class | Mark | Crankshaft main journal outer diameter |
I | 1 | 47.954 ~ 47.960mm (1.8880 ~ 1.8882in) |
II | 2 | 47.948 ~ 47.954mm (1.8877 ~ 1.8880in) |
III | 3 | 47.942 ~ 47.948mm (1.8875 ~ 1.8877in) |
Mark | Color | Crankshaft Main Bearing Thickness |
A | Blue | 2.026 ~ 2.029mm (0.0797 ~ 0.0798in) |
B | Black | 2.023 ~ 2.026mm (0.0796 ~ 0.0797in) |
C | None | 2.020 ~ 2.023mm (0.0795 ~ 0.0796in) |
D | Green | 2.017 ~ 2.020mm (0.0794 ~ 0.0795in) |
E | Yellow | 2.014 ~ 2.017mm (0.0793 ~ 0.0794in) |
Select the bearing from the selection table.
Crankshaft Main Bearing | Cylinder Block Crankshaft Journal Bore Mark | |||
a (A) | b (B) | c (C) | ||
Crank shaft main journal mark | I (1) | E(Yellow) | D(Green) | C(None) |
II (2) | D(Green) | C(None) | B(Black) | |
III (3) | C(None) | B(Black) | A(Blue) | |
