Briggs & Stratton 115400, Manual

Page: 36 / 281

35
2
11. When te st is complete, close air valve.
Then, pull out knob and turn
counterclockwise as far as it will go to
release pressure in combustion cha mber.
12. Disconnect outlet hose from tester before
removing from spark plug hole.
Possible Causes for Poor Compression:
• Loose cylinder head bolts
• Blown head gasket
• Burned valves, valve seats and/or loose
valve seats
• Insufficient tappe t clearance
• Warped cylinder head
• Warped valve stems
• Worn bore and/or rings
• Broken con necting rods
ELECTRICAL TEST EQUIPMENT
Digital Multimeters & Settings
A digital multim eter is required to perform
electrical tests. Briggs & Stratto n offers
multimeter (
#19581
) from your dealer source of
supply. The multimeter you use must withstand
DC input of
10 - 20 amps
for up to
30 seconds and
should be
equipped with two fuses to prevent
damage to the meter if the input limits are
exceeded. Refer to the operators manual that
applies to your meter for the procedure to check
the fuses and general operation.
The digital multimeter is used for numerous tests
which include the following:
Fig. 5
Fig. 6
Fig. 7
Fig. 8 0 10 20 30
OFF
COM
V
Ω
10A
FUSED
Ω
V
∼
300mV
V
A
A ~
AC Volts
Insert the BLACK test lead
into the COM receptacle
of the multim eter. Insert the
RED test lead into the V
Ω
receptacle. Set the rotary
switch to V~.
0
1 0
2 0
3 0
O F F
COM
V
Ω
1 0 A
F U S E D
Ω
V
∼
3 0 0 m V
V
A
A ~
DC Volts
Insert the BLACK test lead
into the COM receptacle of
the multimeter. Insert the
RED test lead into the V
Ω
receptacle.Set the rotary
switch to V===.
0 10 20 30
OFF
C O M
V
Ω
10A
FUSED
Ω
V
∼
300 mV
V
A
A ~
DC Amps over 10 Amps
Use with DC Shunt. Insert
the BLACK test lead into the
COM receptacle of the
multimeter. Insert the RED
test lead into the V
Ω
receptacle. Set the rotary
switch to 300mV.
0 10 20 30
OFF
COM
V
Ω
1 0 A
FUS ED
Ω
V
∼
3 0 0 m V
V
A
A ~
Ohms or Continuity
Insert the BLACK test lead
into the COM receptacle of
the multimeter. Insert the
RED test lead into the V
Ω
receptacle. Set the rotary
switch to
Ω
.