Actron KAL2512 - Manual (Page 2)

NOTE: See Manufacturer’s Specifications.
B.Really low, steady vacuum check for:
• Leaking carburetor flange gasket
• Worn carburetor throttle shaft
• Leaking vacuum lines
• Improper valve timing
• Slow engine cranking due to:
- Battery or cable connections
- Defective starter motor
• Mechanical drag in engine due to:
- Tight fitting pistons in rebuilt engine
- Thickened oil due to excessive
oxidation
C.Pulses unsteady indicates a leaky
condition that affects one or more
cylinders check for:
• Burned or stuck valve
• Intake manifold leak at a cylinder
• Worn intake valve guide
• Broken piston or piston rings
NOTE: A certain amount of even pulsing
is normal, notably on 4 and 6 cylinder
engines, and does not necessarily
indicate a leaky condition.
Running Vacuum Test For
Engine Condition
NOTE: It is possible to get a different gauge
reading than obtained during the Cranking
Vacuum Test For Engine Condition.
1. Using hose supplied, connect
Vacuum Gauge to fitting on
carburetor below throttle plate.
2. Start Engine and let idle until at
normal operating temperature.
Test Results
2 possible gauge readings are:
0
Engine
Vacuum
5
10
15
20
25
30
10
9
8
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
Fuel
Pump psi
0
Engine
Vacuum
5
10
15
20
25
30
10
9
8
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
Fuel
Pump psi
Steady low vacuum
Unsteady vacuum