Generac Power Systems OHVI GSH 220 Service Manual page 46

SeCTIoN 11: CrANkSHAFT & CAMSHAFT
Figure 11-3. Balancer
CAMSHAFT INSPeCTIoN
Carefully inspect the entire camshaft for wear, nicks or
other damage. All areas indicated in Figure - should be
inspected.
2
3
1
5
6
Figure 11-4. Points to Check on Camshaft
Carefully measure both main bearing ends and check them
for wear. If wear limits are exceeded, replace the defective part.
See SPECIFICATIONS in Section  (Small Frame) or Section 5
(Large Frame) for bearing wear limits.
CrANkSHAFT INSPeCTIoN
CRANKSHAFT PROPER:
Using a commercial solvent, clean the crankshaft thoroughly.
After cleaning, inspect the crankshaft as follows:
. Inspect keyways in crankshaft (see Figure -5). Make sure
they are not worn or spread apart. Remove burrs from
edges of keyways, to prevent scratching the bearing.
2. Inspect the crankshaft gear for chipping or cracking.
If timing gear is damaged, the crankshaft must be
replaced.
1. CHECK SPRING PINS
2. CAMSHAFT GEAR
3. COMPRESSION RELEASE PARTS
4. MAIN BEARING (FLYWHEEL END)
5. MAIN BEARING (PTO END)
6. CAM LOBES
4
. Inspect the crankpin for nicks, scratches or other damage.
Small scratches and nicks can be polished out using
fine emery cloth. ALL EMERY CLOTH RESIDUE MUST BE
COMPLETELY REMOVED USING A SOLVENT (SUCH AS
KEROSENE).
. Carefully measure the diameters of the crankpin, crank-
shaft journal at flywheel end, and the crankshaft journal
at PTO end. Replace the crankshaft if it is worn beyond
the stated repair limits. See SPECIFICATIONS in Section 
(Small Frame) or Section 5 (Large Frame) for crankshaft
diameters.
NOTE: The crankpin must NOT be ground to any smaller
diameter. Undersize connecting rods are NOT available.
1
5
1. CHECK KEYWAYS
2. CRANKSHAFT GEAR
3. OIL PASSAGE
4. JOURNAL (FLYWHEEL END)
Figure 11-5. Points to Check on Crankshaft
CRANKSHAFT SLEEVE BEARING:
The crankshaft bore in the crankcase is a pressure lubricated oil
bearing that may or may not include an additional sleeve bear-
ing, depending on the vintage of the engine (Figure -6).
The crankshaft bore in the crankcase cover is also a pressure
lubricated oil bearing.
Inspect the bearing and bearing bore as follows:
. Where applicable, check the sleeve bearing in the crank-
case for damage.
a. Measure the inside diameter of the sleeve or bearing
bore. Replace the bearing (if equipped) if it is worn exces-
sively.
b. Press out the old bearing and press a new bearing into
place (if equipped).
See SPECIFICATIONS in Section  (Small Frame) or Section
5 (Large Frame) for bearing and bore dimensions.
NOTE: Alignment of the oil holes in the sleeve bearing
and bearing bore in the crankcase is critical.
-2
3
2
4
7
6
5. JOURNAL (PTO END)
6. CRANKPIN
7. THREADED ENDS
1