Compression test

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Patrick98
Posts: 49
Joined: Thu Aug 02, 2018 7:44 pm
Location: Bt344st

Compression test

Post by Patrick98 » Mon Feb 18, 2019 12:14 am

Hello never done a compression test before on a diesel before just wondering how to go about doing it.. ie. Do I take all of the injectors out and test each one individually or take one out at a time and put in injectors as I finish with each.. some tips will help.. thanks

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DB780
Posts: 1628
Joined: Fri Dec 30, 2005 4:06 pm
Location: Lincolnshire

Re: Compression test

Post by DB780 » Mon Feb 18, 2019 8:41 am

I take them all out then test each one. Do a dry test then squirt a little oil into the bore and re-test. You will find it better to rig a pipe up for the returns line, saves getting covered in diesel!

Patrick98
Posts: 49
Joined: Thu Aug 02, 2018 7:44 pm
Location: Bt344st

Re: Compression test

Post by Patrick98 » Mon Feb 18, 2019 9:10 am

DB780 wrote:
Mon Feb 18, 2019 8:41 am
I take them all out then test each one. Do a dry test then squirt a little oil into the bore and re-test. You will find it better to rig a pipe up for the returns line, saves getting covered in diesel!
What do you mean by right a pipe up for the return lines?? Thanks.

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rid54
Posts: 174
Joined: Mon Oct 13, 2014 8:20 am
Location: Vallentuna, Sweden

Re: Compression test

Post by rid54 » Mon Feb 18, 2019 4:55 pm

As you crank the engine, the lift pump will operate. The fuel return line is often common to the injectors and the overflow from the injection pump, so the return tubing removed from the injectors will spill return flow all over. You need to disable the lift pump or collect the return fuel somehow.

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