Generac Power Systems 53187 - Manual (Page 77)

SECTION 2.4
DISASSEMBLY AND INSPECTION
1
Crankshaft Bearing (Continued)
3. If oil clearance exceeds the allow able lim it, replace
the bearino or grind the crankshaft journal and use an
undersize bearing.
□ standard Oil Clearance = 0.0015*0.0024 Inch
(0.039-0.106mm)
□ Allowable Limit = 0.0079 inch (0.2mm)
CRANK JOURNAL O.D. BEARING SIZE
1.8096-1.8100 Inch
(45.964-45.975mm)
Standard
1.7998-1.6002 inch
45.714-45.725mm)
0.25mm U.S.
1.7899-1.7903 Inch
(45.464-45.475mm)
0.50mm U.S.
Figure 24. Crankshaft Bearing Oil Clearance
See Figure 25. Measure inside diam eters at posi­
tions 1 and 2. At each of the positions, m easure in
directions A and B as show n.
NO TE; W hen changing the bushing, press fit using
a press. If the crankshaft Journal has been ground,
check oil clearance before Installing crankshaft.
Crankshaft
1. Support the crankshaft on a V-Block. Then, check
w ith a dial indicator as follow s:
PART 2
ENGINE MECHANICAL
a. Position the dial indicator on the crankshaft center/"~\^
i ournal. Then, turn the crankshaft slow ly one full turn.
). If the gauge reading exceeds the allow able lim it.
replace the crankshaft.
c. Inspect the oil seal contact face for dam age or
w ear.
d. Check for clogged oil holes.
□ standard Deflection = 0.0012 Inch (0.03mm) or
less
□ Allowable Limit = 0.0024 inch (0.06mm)
2. See Figure 26. Inspect crankshaft journal and pin
sections for dam age, uneven abrasion, out-of-round-
ness, and axle diam eter.
a. Take m easurem ents as show n in the illustration,
at points 1 and 2 and in the directions A-A and B-B.
b. Avoid the oil holes w hen m easuring.
SHAFT Dl
BEARING
SIZE
AMETER OF CRANKS
STANDARD
DIAMETER
HAFT JOURNAL
ALLOWABLE
LIMIT
bianaara T.8Uyb’"-r8iuu men
(45.964-45.975mm)
i.BU/u men
(45.9mm)
0.25mm U.S. 1.7998-1.8002 Inch
(45.714-45.725mm)
1.7972 inch
(45.65mm)
0.50mm U.S. 1.7899-1.7903 inch
(45.464-45.475mm)
1.7874 In*
(45.4mm)*
* If crankshaft journal or crankshaft pin d
this value, replace the crankshaft
lameter Is less than
SHAFT Dl
BEARING
SIZE
AMETER OF CRANKS
STANDARD
DIAMETER
HAFT PIN
ALLOWABLE
LIMIT
"sranusra 1.5340-1.5344 IhCn
(38.964-38.975mm)
1 men
(38.9mm)
0.25mm U.S. 1.5242-1.5246 Inch
(38.714-38.725mm)
1.5216 Inch
(38.65mm)
0.50mm U.S. 1.5143-1.5148 Inch
(38.464-38.475mm)
1.5118 inch*
(38.40mm)*
PAGE 2.4-8