Actron KAL2504 - Manual (Page 3)

Test Results
Normal Cylinder:
•
Gauge needle should travel up-scale on each compression
stroke until a peak value is reached.
•
All cylinders should have a pressure within vehicle
manufacturer’s specifications.
•
Readings should not vary more than 10% from cylinder to
cylinder.
Needle fails to travel up gauge or remains at same value for
several strokes then climbs:
•
Check for a sticking valve.
Compression reading is alot higher than manufacturer’s
specifications
•
Check for carbon build-up in cylinder.
Reading on 2 adjacent cylinders is 20 pounds (or more)
lower than the other cylinders
•
Check for a defective head gasket.
•
Check for water (coolant) or oil in the 2 cylinders.
Reading are low or vary widely between cylinders
•
Pour teaspoon of SAE grade 30 oil into each cylinder and
retest
-
If reading increases alot fault may be due to poorly
seated or worn pison rings.
-
If reading remains about the same valves and associated
components are likely the problem.
Return to Original Configuration
1. Clean, regap and reinstall spark plugs or install new spark plugs.
2. Reconnect all spark plug wires
3. Remove string from carburetor throttle plates.
CAUTION
Make sure throttle plates return to closed position
4. Reconnect igintion system that was disconnected in step 9 of
test procedure.