Check Oil Pressure; Charging System - Briggs & Stratton 272147 Repair Manual

TM
Vanguard Twin-Cylinder OHV Liquid-Cooled Engine
Section 2 - Troubleshooting

CHECK OIL PRESSURE

1. Oil level must be between the
mark on dipstick. If oil level is low, check for leaks
and add to mark.
FULL
2. Remove pressure switch.
3. Install oil pressure gauge, Fig. 29.
4. Start and run engine for approximately 5 minutes.
5. Check oil pressure at 3000 RPM.
Oil Pressure - @ 70°F (21°C): 10 ~ 50 psi (0.7 ~ 3.5 Bar)
Fig. 29
Low Oil Pressure could be caused by:
• Engine RPM Too Low
• Wrong Viscosity or Diluted Oil
• Low Oil Level
• Broken Pressure Relief Spring
• Missing Pressure Relief Plunger
• Leaking O-Ring in Crankcase Cover
• Worn Bearings
• Damaged or Defective Oil Pump
High Oil Pressure could be caused by:
• Wrong Viscosity Oil
• Plugged Oil Galleries
• Stuck Pressure Relief Plunger

CHARGING SYSTEM

and The engine is equipped with a 20 amp regulated
LOW FULL
alternator system that provides AC current through two
output leads to the regulator-rectifier. The regulator-
rectifier converts the AC current to DC, and regulates
current to the battery. The charging rate will vary with
engine RPM and temperatures.
The stator, regulator-rectifier and flywheel are not
interchangeable with any other alternator system.
TROUBLESHOOTING
The following list is provided to aid you in diagnosing the
possible causes of problems with alternator systems.
"Battery not charging"
"Battery in state of overcharge"
Testing Alternator Output
WHEN CHECKING THE ALTERNATOR
COMPONENTS, MAKE THE TESTS IN THE
FOLLOWING SEQUENCE:
• Inline fuse "blown" (if equipped).
• Defective battery.
• Loose, pinched, or corroded battery leads.
• Open, shorted, or grounded wires between output
connector and battery.
• Defective diode (open or shorted).
• Defective or improperly grounded regulator-
rectifier.
• Damaged battery (shorted battery cells).
• Excessive current draw from accessories.
• Low magnetic flux or damaged alternator magnets.
• Engine RPM too low.
• Severe battery vibration (missing or broken tie-
down straps)
• Battery rate of charge not matched to alternator
output
• Damaged battery (shorted battery cells)
• Defective regulator
1. Insert test lead into
RED
2. Insert test lead into
BLACK
meter.
3. Rotate selector to AC volts position.
receptacle in meter.
receptacle in
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