Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 475

6A2-100 ENGINE MECHANICAL (H25 ENGINE)
Out-of-round and taper (uneven wear) of journals
An unevenly worn crankshaft journal shows up as a difference in
diameter at a cross section or along its length (or both). This dif-
ference, if any, is determined by taking micrometer readings. If
any one of journals is badly damaged or if amount of uneven wear
in the sense explained above exceeds its limit, regrind or replace
crankshaft.
Crankshaft journal out-of-round (A – B)
Limit : 0.01 mm (0.0004 in.)
Crankshaft taper (a – b)
Limit : 0.01 mm (0.0004 in.)
Main Bearings
General information
• Service main bearings are available in standard size and
0.25 mm (0.0098 in.) undersize, and each of them has 5
kinds of bearings differing in tolerance.
• Upper half of bearing (1) has oil groove (2) as shown in fig-
ure. Install this half with oil groove toward cylinder block.
• Lower half of bearing does not have oil groove.
Inspect
Check bearings for pitting, scratches, wear or damage.
If any malcondition is found, replace both upper and lower halves.
Never replace either half without replacing the other half.