Crankshafts Camshafts Gear Reductions.pdf

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CRANKSHAFTS, CAMSHAFTS & GEAR REDUCTIONS
Copyright
©
1999 by Briggs and Stratton Corporation
Intek
TM
Single Cylinder OHV Engine Repair Manual
Version 1.0
CRANKSHAFTS, CAMSHAFTS & GEAR REDUCTIONS
Camshaft
Copyright
©
1999 by Briggs and Stratton Corporation
Intek
TM
Single Cylinder OHV Engine Repair Manual
Version 1.0
CRANKSHAFTS, CAMSHAFTS & GEAR REDUCTIONS
Camshaft
Remove Crankshaft & Camshaft - All Models
Before removing crankshaft from engine, remove rust,
paint, or burrs from power take off end of crankshaft.
This will eliminate or reduce chances of damaging oil
seal, crankcase cover and/or sump bearing.
1. Drain oil from crankcase.
2. Remove crankcase cover or sump.
3. If crankcase cover or sump sticks, tap lightly with
soft hammer on alternate sides near dowel pins,
Fig. 1.
Note: It is
not necessary to remove dowel pins.
Fig. 1 - Remove Sump or Crankcase Cover - Typical
4. Tip engine over onto flywheel side of crankcase.
5. Support engine to prevent end of crankshaft from
resting on workbench.
6. Rotate crankshaft until timing marks are aligned.
7. With camshaft in this position, the valve tappets will
remain clear of cam lobes. Lift out camshaft, Fig. 2.
Fig. 2 - Remove Camshaft
Copyright
©
1999 by Briggs and Stratton Corporation
Intek
TM
Single Cylinder OHV Engine Repair Manual
Version 1.0
Page 1 of 3
CRANKSHAFTS, CAMSHAFTS & GEAR REDUCTIONS
Camshaft
Inspect All
Inspect Camshaft
Inspect gear teeth for wear and nicks, Fig. 4.
Camshaft, camshaft journals, and lobe rejection sizes
are shown in Table No. 3. See Fig. 4 for other areas to
be checked for wear and freedom of movement.
Fig. 4 - Camshaft Check Points, Typical
Camshaft Reject Sizes
Models
Magneto
Journal
Magneto
Journal
Cam
Lobes
110400
110600
111400
111600
113400
120400
121400
121600
122600
123400
123600
.498"
(12.65 mm)
.498"
(12.65 mm)
Galled
28S700
311700
.498"
(12.65 mm)
.498"
(12.65 mm)
1.184"
(30.07 mm)
Table No. 3
Copyright
©
1999 by Briggs and Stratton Corporation
Intek
TM
Single Cylinder OHV Engine Repair Manual
Version 1.0
Page 2 of 3
CRANKSHAFTS, CAMSHAFTS & GEAR REDUCTIONS
Camshaft
Inspect
Check Compression Release
Models 110400, 110600, 111400, 111600, 113400,
120400, 120600, 121400, 121600, 122600,
123400123600
Check compression release mechanism for wear, nicks,
and freedom of movement, Fig. 5. Replace if
compression release is worn or sticking.
Fig. 5 - Compression Release Mechanism
Copyright
©
1999 by Briggs and Stratton Corporation
Intek
TM
Single Cylinder OHV Engine Repair Manual
Version 1.0

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