Main Bearings Inspection - Suzuki Liana RH413 Service Manual

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 Inspection

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 the figure.
Install this half with oil groove to cylinder block.
• Lower half of bearing does not have an oil groove.
Visual 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 bearing caps.
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.
I2RH0B140138-01
4) Tighten bearing cap No.1 bolts (1) – (10) and No.2
bolts (11) – (20) gradually as follows.
S3RH0A1406048
a) Tighten bolts (1) – (10) to 30 N⋅m (3.0 kgf-m,
22.0 lb-ft) according to numerical order in the
figure.
b) In the same manner as in Step a), tighten them
to 50 N⋅m (5.0 kgf-m, 36.5 lb-ft).
c) In the same manner as in Step a), retighten them
to 60°.
d) Tighten bolts (11) – (20) to 22 N⋅m (2.2 kgf-m,
16.0 lb-ft) according to numerical order in the
figure.
Tightening torque
Crankshaft bearing cap No.1 bolt ((1) – (10)):
Tighten 30 N⋅m (3.0 kgf-m, 22.0 lb-ft), 50 N⋅m
(5.0 kgf-m, 36.5 lb-ft) and 60° by the specified
procedure
Crankshaft bearing cap No.2 bolt ((11) –
(20)): Tighten 22 N⋅m (2.2 kgf-m, 16.0 lb-ft) by
the specified procedure
I2RH0B140139-01
Engine Mechanical: 1D-50
I2RH0B140140-01