Check the crankshaft main bearing oil clearance.
To check main bearing-to-journal oil clearance, remove the bearing caps with their lower bearings.
Clean each main journal and lower bearing with a clean shop towel.
Place one strip of plastigage across each main journal.
Reinstall the bearing caps with their lower bearings, then tighten the bolts.
Tightening torque :
17.7 ~ 21.6 N.m (1.8 ~ 2.2 kgf.m, 13.0 ~ 15.9 lb-ft) + 88 ~ 92°
Do not turn the crankshaft.
Do not reuse the main bearing cap bolts.
Remove the bearing caps with their lower bearing again, and measure the widest part of the plastigage.
Main bearing oil clearance
Standard : 0.006 ~ 0.024 mm (0.0002 ~ 0.0009 in)
Limit : 0.05 mm (0.0020 in)
If the plastigage measures too wide or too narrow, remove the upper and lower bearing and then install a new bearings with the same color mark. Recheck the oil clearance.
Do not file, shim, or scrape the bearings or the cap to adjust clearance.
If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing. Recheck the oil clearance.
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 because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.
Select the bearing by using selection table.
Letters have been stamped on the side of block as a mark for the size of each of the 5 main journal bores.
Use them, and the numbers or letters stamped on the crank (marks for main journal size), to choose the correct bearings.
Crankshaft main bearing | Cylinder block crankshaft journal bore mark | |||
a (A) or 1 | b (B) or 2 | c (C) or 3 | ||
Crankshaft main journal mark | I (1) | E (Red or Yellow) | D (Green) | C (None) |
II (2) | D (Green) | C (None) | B (Black) | |
III (3) | C (None) | B (Black) | A (Blue) | |
Class | Mark | Cylinder block journal bore inner diameter |
a | A or 1 | 52.000 ~ 52.006 mm (2.0472 ~ 2.0475 in) |
b | B or 2 | 52.006 ~ 52.012 mm (2.0475 ~ 2.0477 in) |
c | C or 3 | 52.012 ~ 52.018 mm (2.0477 ~ 2.0479 in) |
Class | Mark | Crankshaft main journal outer diameter |
I | 1 | 47.954 ~ 47.960 mm (1.8879 ~ 1.8882 in) |
II | 2 | 47.948 ~ 47.954 mm (1.8877 ~ 1.8879 in) |
III | 3 | 47.942 ~ 47.948 mm (1.8875 ~ 1.8877 in) |
Top surface stamp
Bottom surface stamp
Class | Color | Crankshaft main bearing thickness |
A | Blue | 2.026 ~ 2.029 mm (0.0798 ~ 0.0799 in) |
B | Black | 2.023 ~ 2.026 mm (0.0796 ~ 0.0798 in) |
C | None | 2.020 ~ 2.023 mm (0.0795 ~ 0.0796 in) |
D | Green | 2.017 ~ 2.020 mm (0.0794 ~ 0.0795 in) |
E | Red or Yellow | 2.014 ~ 2.017 mm (0.0793 ~ 0.0794 in) |
