Main Bearings Inspection - Suzuki GRAND VITARA Owner's Manual

NOTE
After checking the thrust play, make sure that
thread deformation of each bearing cap No.1
bolt referring to "Main Bearing Cap No.1
Bolt" in "Main Bearings Inspection: For M16A
Engine with VVT".
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.
Crankshaft out-of-round and taper
Limit: 0.01 mm (0.0004 in.)
Out-of-round
A – B
Taper
a – b
Engine Mechanical: For M16A Engine with VVT 1D-57

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.
I2RH01140183-01
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
NOTE
Do not rotate crankshaft while gauging
plastic is installed.
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) the full width of
bearing (parallel to crankshaft) on journal, avoiding
oil hole.
I2RH0B140138-01
S5JB0A1416038
I2RH0B140139-01
I2RH0B140140-01