Crankshaft Main Bearing

MAIN BEARING HOUSING INNER DIAMETER





^ Install lower cylinder block without installing main bearings, and tighten lower cylinder block bolts to the specified torque.
^ Measure the inner diameter of main bearing housing with bore gauge.
Standard: 74.993 - 75.017 mm (2.9525 - 2.9534 inch)
^ If out of the standard, replace cylinder block and lower cylinder block as assembly.

NOTE: Cylinder block cannot be replaced as a single part, because it is machined together with lower cylinder block.

MAIN BEARING OIL CLEARANCE
Method by Calculation





^ Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the specified torque.
^ Measure the inner diameter of main bearing with bore gauge.
(Bearing clearance) = (Main bearing inner diameter) - (Crankshaft main journal diameter)
Standard: 0.035 - 0.045 mm (0.0014 - 0.0018 inch) (actual clearance)
Limit: 0.065 mm (0.0026 inch)
^ If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain specified bearing oil clearance.

Method of Using Plastigage
^ Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
^ Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil holes.
^ Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the specified torque.

CAUTION: Do not rotate crankshaft.





^ Remove lower cylinder block and bearings, and using scale on plastigage bag, measure the plastigage width.

NOTE: The procedure when the measured value exceeds the limit is same as that described in the "Method by Calculation".

CRUSH HEIGHT OF MAIN BEARING





^ When lower cylinder block is removed after being tightened to the specified torque with main bearings installed, the tip end of bearing must protrude.
Standard: There must be crush height.
^ If the standard is not met, replace main bearings.

Main Bearing
Tighten lower cylinder block as follows:
Apply new engine oil to threads and seat surfaces of the bolts.





Tighten M8 bolts in numerical order as shown from No. 17 to 24.
Bolts 17 - 24 22.1 Nm (2.3 kg-m, 16 ft. lbs.)

CAUTION: Wipe off completely any protruding liquid gasket on rear oil seal installation surface.

NOTE: There are more processes to complete the tightening bolts. However stop procedure here to install rear oil seal.

Install rear oil seal.
Restart tightening of lower cylinder block bolts as follows:





Tighten M10 bolts in numerical order as shown from No. 1 to 16.

NOTE: Use TORX socket (size E14) for bolts No. 1 to 16 (M10 bolt).

Bolts 1 - 16 35.3 Nm (3.6 kg-m, 26 ft. lbs.)





Turn M10 bolts 90° clockwise in numerical order from No. 1 to 16 using Tool.
Tool number: KV10112100 (BT-8653-A)

CAUTION: Use angle wrench Tool to check tightening angle. Do not make judgement by visual inspection.

After installing the bolts, make sure that crankshaft can be rotated smoothly by hand.
Wipe off completely any protruding liquid gasket on front side of the engine.
Check the crankshaft end play.

LOWER CYLINDER BLOCK BOLT OUTER DIAMETER





^ Measure the outer diameters ("d1", "d2") at two positions as shown.
^ If reduction appears in "A" range, regard it as "d2".
Limit ("d1" - "d2") 0.11 mm (0.0051 inch)
^ If it exceeds the limit (large difference in dimensions), replace lower cylinder block bolt with new one.

MAIN BEARING:

MAIN BEARING

Undersize:

Undersize

Main Bearing Oil Clearance:

Main Bearing Clearance