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1. The test needle should travel up the scale until it reaches the peak for that cylinder. You
should find that each cylinder does not vary more than 10% from cylinder to cylinder. If
you find that they do you may have a problem.
2. If the test result is high then this may indicate that the cylinder has carbon build up. It
may also indicate that the head of the cylinder has been modified.
3. If a reading on two adjacent cylinders is 20psi/kg/cm² (or more) lower than the other
cylinders, the problem may be a cracked cylinder head or broken head gasket. In this
case then coolant and oil may be found in both cylinders.
4. If the readings are too low, or vary too widely between cylinders, pour a teaspoon of
SAE 30 oil into each cylinder and retest them. If the readings increase considerably, the
problem may be poorly seated, or worn piston rings. If the readings remain about the
same, the valves and/or associated components may be the problem. A burned or
damaged piston may also cause the same results.
Findings
Completing test
1. When the test is complete please make sure that you clean and re install the spark
plugs as they were initially removed. You can also take this opportunity to replace the
spark plugs.
2. Reconnect the leads to the spark plugs
3. Return the throttle to closed position – FAILURE TO COMPLETE THIS STEP CAN
RESULT IN SERIOUS DAMAGE TO THE ENGINE
4. Reconnect the ignition system
Contact
Find out more about the Bluespot® Lifetime Guarantee at
www.bluespot.uk.com
Tel: 0800 093 0115
Email: sales@bluespot.uk.com
Orme Business Centre,
Greenacres Road,
Oldham,
OL4 3NT
