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Compression Test Question

  • Thread starter Thread starter MisterCinders
  • Start date Start date
M

MisterCinders

Guest
Trying to grasp the basics of this test.

Clymer says to open throttle and crank engine to measure compression. Does that mean using the bolt to turn engine like when rotating valves? Or do I simply open the throttle to check? TIA.
 
Take all of the plugs out and crank the engine like you are trying to start it while holding the throttle open. Once the needle stops moving you are set for that cylinder. Move to the next one.
 
MisterCinders said:
Trying to grasp the basics of this test.

Clymer says to open throttle and crank engine to measure compression. Does that mean using the bolt to turn engine like when rotating valves? Or do I simply open the throttle to check? TIA.
Click to expand...

Make sure the choke is in the off position. Remove spark plugs and put the compression guage on the cylinder you want to read. Hold the throttle wide open. Spin engine with starter. Read guage. The little button on the side of the guage is compression release which resets the guage to zero.

Earl
 
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