AD41 compression test

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nealball

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Hopefully someone like Volvopaul will come along, looking at a twin engine sealine, do the ad41 engines have separate heater plugs for each cylinder, I want to carry out a compression test on each cylinder, and not having worked on a AD41 before, hopefully someone will tell me how to test

regards
 
I tested using a pressure gauge connected to an adapted injector. Can not remember exactly how as it was a long time ago!
 
nealball said:
Hopefully someone like Volvopaul will come along, looking at a twin engine sealine, do the ad41 engines have separate heater plugs for each cylinder, I want to carry out a compression test on each cylinder, and not having worked on a AD41 before, hopefully someone will tell me how to test

regards
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No heater plugs as it’s a direct injection engine , just the two in the inlet manifold on the 41A.

compression checks give results when there is a definite blow by or a valve not seating , over the years I have carried out cylinder leak down checks which gives a better result as to what condition the piston rings are , you will need a compressor for that and suitable set up tools.
use the correct tool to withdraw the injectors as the copper sleeve can come with it causing many further problems .
 
Hi, do you have the removal tool number,

anyone have an injector removed and tell me the diameter of the injector body so I can make a adapter for my tester
 
What you think are the issues or symptoms, that it needs a test ? Might be a couple of other tests or checks you could do too, depending
 
Hi QBhoy
It’s a peace of mind thing, currently in negotiations for a boat I like, it has issues, but want to rule out any engine problems, I have in the past bought boats and not checked out the engines, then suffered afterwards, so at least if I know I have good compression on all cylinders I am not worried to much
 
It's not a five minute job to do a compression test as you need to remove injectors fuel lines and fuel return line. Then the small matter that the injectors could be partially seized to head if they havn't been out for a long time.
You would need owners permission I think.
Maybe best left to a volvo dealer who has the tools inc comp tester.
 
Hi stelican, I know it’s several hours work, the owner is aware of the time and labour involved as well, even if it’s a pain to do it’s worth it for peace of mind knowing you have a engine with good compression, things like injectors pumps etc can be easily overhauled, but an engine with low compression is a major strip out and overhaul job
 
nealball said:
Hi QBhoy
It’s a peace of mind thing, currently in negotiations for a boat I like, it has issues, but want to rule out any engine problems, I have in the past bought boats and not checked out the engines, then suffered afterwards, so at least if I know I have good compression on all cylinders I am not worried to much
Click to expand...
Fair play. And as you’ll know, standard and good practice on any petrol engine for sure.
just that it’s quite an invasive procedure on an engine like this. May even leave you open to having to replace some parts, if it doesn’t go to plan. Possible injector and injector sleeve/seal issues, may result.
I think I’d be more keen to ask and look around areas like turbo condition and it’s notorious elbow (on some set ups)
A cold and warm running conditions and visuals will tell a lot too. Oil condition and evidence of maintenance too.
The outdrive condition and function would be more of a co cern to me, perhaps. Few wee common niggles to be aware of
 
Something in my poor fuddled memory of an electronic engine test tool that would give a comparative % for each cylinder without needing a lot of dismantling.
 
Hi gordmac, please remember ASAP, lol, on a serious note though a massive thank you to all of you for information and advice so far, please keep it coming
 
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