Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 398 / 729

YH4
GRAND
VITARA
6A2-74 ENGINE MECHANICAL (H25 ENGINE)
(a)
(a)
(a)
1. Red paint
1. Gaging plastic
1
Crank Pin and Connecting Rod Bearings
Inspect crank pin for uneven wear or damage. Measure crank pin
for out-of-round or taper with a micrometer. If crank pin is dam-
aged, or out-of-round or taper is out of limit, replace crankshaft or
regrind crank pin referring to following step 6).
Connecting rod
bearing size
Crank pin diameter
Standard
49.982 – 50.000 mm
(1.9678 – 1.9685 in.)
0.25 mm (0.0098 in.)
undersize 49.732 – 49.750 mm
(1.9580 – 1.9586 in.)
Out-of-round: A – B
Taper limit
: a – b
Out-of-round and taper limit: 0.01 mm (0.0004 in.)
Rod bearing:
Inspect bearing shells for signs of fusion, pitting, burn or flaking
and observe contact pattern. Bearing shells found in defective
condition must be replaced.
Two kinds of rod bearing are available; standard size bearing and
0.25 mm undersize bearing. For identification of undersize bear-
ing, it is painted red at the position as indicated in figure, under-
size bearing thickness is 1.605 – 1.615 mm (0.0632 – 0.0635 in.)
at the center of it.
Rod bearing clearance:
1) Before checking bearing clearance, clean bearing and crank
pin.
2) Install bearing in connecting rod and bearing cap.
3) Place a piece of gaging plastic to full width of crank pin as con-
tacted by bearing (parallel to crankshaft), avoiding oil hole.
4) Install rod bearing cap to connecting rod.
When installing cap, be sure to point arrow mark on cap to
crankshaft pulley side, as shown in figure. After applying en-
gine oil to rod bolts, tighten cap nuts to specified torque. DO
NOT turn crankshaft with gaging plastic installed.
Tightening Torque
(a): 45 N
.
m (4.5 kg-m, 32.5 lb-ft)