leakdown test

[dunc333]

hi guys i have a 2004merc 60hpefi 4stroke and it makes a bit of oil ,i have changed fuel pump diaphram and checked thermostat so how do i perform a leakdown test cheers .

 

[Bifflefan]

Re: leakdown test

it makes a bit of oil

What does that mean???

Do a compression check first.
See if you have a problem before you go looking for one.
What is the problem and/or what are you trying to find out?

 

[dunc333]

Re: leakdown test

it means my friend, oil gets diluted with fuel which is a common problem in these motors,after say 50hours the oil,has about 200mls of fuel in it,which dilutes the oil and then lack of lubrication and chance of fire ,comp test is all good and even all between 184 and 189psi,its not a huge problem if you change oil every 50hours but i should get 100hrs before changing oil .

 

[Bifflefan]

Re: leakdown test

Now I think I understand, Your getting gas into the crank case oil.
I dont have any answer for this, or even a guess. Sorry.
If your not low on compression a leakdown wont give you any thing to go on.
You may have an injector that is not spraying properly tho, thats all I can add.

 

[Dave1027]

Re: leakdown test

Does it have a PCV valve? If so you may want to replace it.

 

[dunc333]

Re: leakdown test

thanks 4 your replys bifflefan and dave 107 and yes it does have a pcv valvle ,that is the valve with 2 outlets and hose goes from bottom 1 to the intake manifold?