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Old 09-10-2017, 09:50 AM   #1
Ensign
 
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Default Compression test mercruiser 3lt

Hi all,

Been looking at how to do a compression test on engines.

So far I understand to do this test:

1. Seems you need the compression test gauge+hose and correct adapter.

Fit compression gauge in spark plug hole, turn engine 5 times and read the gauge.

2. Before the test is done I understand you need to disconnect the ignition from the engine to stop it firing. Also disconnect the fuel.

For 2. above does anyone know where the connections are located and how to disconnect them?

Cheers.

If you feel you can offer any further advice please do.
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Old 09-10-2017, 11:26 AM   #2
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Additionally the engine should be warmed before performing the test.

On the ignition coil remove the wire from the positive terminal.

The fuel pump does not need to be disconnected.
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Old 09-10-2017, 12:59 PM   #3
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Quote:
Originally Posted by mmwjr View Post
Additionally the engine should be warmed before performing the test.

On the ignition coil remove the wire from the positive terminal.

The fuel pump does not need to be disconnected.
Should be quite simple then.

Thank you
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