SHOP MANUAL
Engine
Ch 1 page 140
- When regrinding, stated undersizes must be
complied with. Suitable bearings are
available for these sizes.
- Refer to the next page for the diameters
required for different undersizes.
- It is important that the fillet radius of the
journals is correct.
- After grinding the journals, the oil hole
connections to the bearing surfaces should be
rounded off and polished.
Cylinder block
Reconditioning
Heat arising from the main bearings seizing and
rotating in the cylinder block will change the
properties of the material in the cylinder block.
These cylinder blocks must be discarded.
If the main bearing seizes but does not rotate in
the cylinder block, the cylinder block can be
overhauled. The main bearing seats must
comply with the demands on roundness given in
the table. Machining out-of-round main bearing
seats is something we do not recommend.
1. Measure the diameter at four different
positions as illustrated. The diameter must
be measured with the main bearing caps
tightened and without main bearings.
2. Check the dimensions with those in the
table.
Minimum Maximum Maximum
permitted permitted permitted
diameter diameter difference*
112.200 mm 112.222 mm 0.016 mm
* Maximum permitted difference between the largest
and smallest diameter on the same main bearing
seat.
Figure 279
Figure 280
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