Suzuki Grand Vitara 2011 Manual page 614

1D-124 Engine Mechanical: For J20 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 difference, 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
exceeds its limit, regrind or replace crankshaft.
Limit on out-of-round and taper
0.01 mm (0.0004 in.)
Out-of-round
"A" – "B"
Taper
"a" – "b"
Main Bearings
Main bearings general information
• Service main bearings are available in standard size
and 0.25 mm (0.0098 in.) undersize, and standard
size has 5 kinds of bearings differing in tolerance.
• Upper half of bearing (1) has oil groove (2) as shown
in figure.
Install this half with oil groove to cylinder block.
• Lower half of bearing does not have oil groove.
Main bearings inspection
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.
Main bearing clearance
Check clearance by using gauging plastic according to
the following procedure.
1) Remove lower crankcase.
2) Clean bearings and main journals.
3) Place a piece of gauging plastic (1) to full width of
bearing (parallel to crankshaft) on journal, avoiding
oil hole.
4) Install lower crankcase to cylinder block referring to
"Main Bearings, Crankshaft and Cylinder Block
Removal and Installation: For J20 Engine".
I2RH01140185-01
NOTE
Do not rotate crankshaft while gauging
plastic is installed.
5) Remove lower crankcase and using scale (2) on
gauging plastic envelop (1), measure gauging plastic
width at its widest point. If clearance exceeds its
limit, replace bearing. Always replace both upper
and lower inserts as a unit.
A new standard bearing may produce proper
clearance. If not, it will be necessary to regrind
crankshaft journal for use of 0.25 mm undersize
bearing.
After selecting new bearing, recheck clearance.
Main Bearing Clearance
Standard: 0.032 – 0.050 mm (0.0013 – 0.0019 in.)
Limit: 0.063 mm (0.0024 in.)
I2RH01140186-01
I2RH01140187-01
I2RH01140188-01