Blocked oil drain gallery?

Joined
Jan 23, 2014
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Australia
There are 3 oil drain galleries in the head of my 6G74 Diamante. One seems blocked (oil puddle there that does not go away). Is this a problem? Can this be fixed without removing the heads? Considering the puddle of oil does not drain, I assume no flush will fix that.
 
Joined
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Santa Barbara, CA
Is it blocked with build up, or is it purposefully blocked? On some engines a drain back will be blocked or restricted on purpose to keep oil in a certain spot.
 
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Mar 18, 2008
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Yeah if it is blocked with sludge then you definitely have a problem. Clean out the sludge as best you can, run a good high detergent synthetic oil and change it frequently.
 
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What does the rest of the motor look like? Generally if there's sludge it will be everywhere, not just in a few oil galleys
 

Spetz

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Australia
The motor is clean and has no sludge build up. I don't know what it can be, or how this happened. As said flush/detergent oil won't help as no oil seems to be getting past at all.
 
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If you can, in fact, verify it's sludge blocking a galley and not a solid piece of metal where a galley looks like it should be, sure you could clean it. But be advised that cleaning sludge is an all or nothing approach. See here for a video of what I mean http://youtu.be/KC-SxrsgEwo
 

Spetz

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Considering the engine is sludge free, I don't know if I should try to push down whatever is clogging the oil drain gallery??
 
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I once saw an oil gallery blocked by an o-ring sandwiched between the head and block that must have become displaced during assembly. Ran for a few years before wearing out the valve train.
 
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Take a look and see what it is, it may even be a piece of foil from a bottle top. No reason you cant try to push a piece of thin metal rod down there carefully.
 

Spetz

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As an update, turns out that there is no oil drain gallery there, so the accumulation of oil is normal. Thanks for the help guys
 
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