Briggs & Stratton Twin Cylinder L-Head, Repair Manual

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6
5
Conditions Affecting Starter Motor
Performance
1. Binding or seized starter motor bearings.
2. A shorted, open or grounded armature.
a.
Shorted armature (insulation worn and wires
touching one another), will be indicated by low
or no RPM and excessive current draw.
b. Open armature (wire broken), will be indicated
by low or no RPM and excessive current draw.
c. Grounded armature (wire insulation worn and
wire touching armature lamination or shaft).
Will be indicated by excessive current draw or
no RPM.
3. A defective starter motor switch.
4. Weakened magnets.
5. Starter drive dirty or binding.
STARTER DRIVE
Checking Starter Motor Drive
When the starter motor is activated, the pinion gear
should engage the flywheel ring gear and crank the
engine. If the starter motor drive does not react
properly, inspect the helix and pinion gear for freedom
of operation. The pinion must move freely on the helix for correct
starter operation. If any sticking occurs, this must be
corrected.
Twin cylinder starters use three styles of starter pinion
gear retainer mechanisms, Fig. 12, Fig. 13, Fig. 14.
Fig. 12 – C-ring Style
ROLL PIN
PLASTIC CAP
Fig. 13 – Roll Pin Style
Fig. 14 – Roll Pin Style With Plastic
Cap
Early Style
Disassemble Starter Motor Drive –
C-ring Style
WARNING: TO PREVENT eye injury always
wear eye protection when removing C-ring.
1. Place counterbore side of Tool #19436 over retain-
er and align drive pins with open end of C-ring,
Fig. 15.
IMPORTANT: IF RETAINER has a notch as shown,
DO NOT align drive pins with notch. If necessary,
rotate notch away from open end of C-ring.
2. Place palm of hand over tool and push down
evenly on tool to compress spring washer.
3. While applying pressure, turn knurled knob
clockwise until C-ring pops off. Discard C-ring.
Fig. 15 – Removing C-ring
DO NOT ALIGN DRIVE
PINS WITH NOTCH
RETAINER
TOOL # 19436
DRIVE PINS