Check the crankshaft bearing oil clearance.
To check main bearing-to-journal oil clearance, remove the bed plate and 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 lower bearings and bed plate, then tighten the bolts.
Tightening torque
Long bolts :
22.6 ~ 26.5 N.m (2.3 ~ 2.7 kgf.m, 16.6 ~ 19.5 lb-ft) + 90 ~ 94°
Short bolts :
32.4 ~ 36.3 N.m (3.3 ~ 3.7 kgf.m, 23.9 ~ 26.8 lb-ft)
Do not turn the crankshaft.
Always use new crankshaft main bearing cap bolts. Crankshaft main bearing cap bolts are toque-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 bed plate and lower bearing again, and measure the widest part of the plastigage.
Standard oil clearance :
0.024 ~ 0.042 mm (0.0009 ~ 0.0017 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.
Cylinder Block Crankshaft Journal Bore Mark Location
Letters have been stamped on the front face 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.
Mark | Cylinder block crankshaft journal bore inner diameter |
A | 58.000 ~ 58.006 mm (2.2835 ~ 2.2837 in) |
B | 58.006 ~ 58.012 mm (2.2837 ~ 2.2839 in) |
C | 58.012 ~ 58.018 mm (2.2839 ~ 2.2842 in) |
Mark | Crankshaft main journal outer diameter |
A | 53.984 ~ 53.990 mm (2.1254 ~ 2.1256 in) |
B | 53.978 ~ 53.984 mm (2.1251 ~ 2.1254 in) |
C | 53.972 ~ 53.978 mm (2.1249 ~ 2.1251 in) |
Color | Crankshaft main bearing thickness |
Blue | 1.990 ~ 1.993 mm (0.0783 ~ 0.0785 in) |
Black | 1.993 ~ 1.996 mm (0.0785 ~ 0.0786 in) |
None | 1.996 ~ 1.999 mm (0.0786 ~ 0.0787 in) |
Green | 1.999 ~ 2.002 mm (0.0787 ~ 0.0788 in) |
Yellow | 2.002 ~ 2.005 mm (0.0788 ~ 0.0789 in) |
Select the bearing by using selection table.
Crankshaft main bearing | Cylinder block crankshaft journal bore mark | |||
A | B | C | ||
Crank shaft main journal mark | A | Blue | Black | None |
B | Black | None | Green | |
C | None | Green | Yellow | |
