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4g63t dohc vr4 oil

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benny23

Proven Member
32
0
Aug 15, 2015
Brisbane, Australia
can anyone explain this part to me, its bolted on under the rocker cover breather and also the cam angle sensor on side of block oposite to the cam gears! its leaking a huge amount of oil even when the car isnt running
 

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That's the thermostat housing and shouldn't be leaking any oil. I would suspect the valve cover and Half moon gasket. Or the oring on the cas.
half moon? the cas was only just recently a week ago installed by a mechanic, sounds like it could be the o-ring on the cas? il go out and put my hand under it now! but it doesnt make sense to leak from that as its to high up on engine to leak that much
 
The half moon gasket is part of the valve cover gasket and is right above the thermostat housing. What happen with the oil catch can was it full?
valve cover gasket is dry as a bone and bottom of cas is 100 percent dry and below that is this
 

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There is an oil galley plug in that area kind of by the blot on the right side and there are a few more above check all of those.
yea ok il have to check that out, its defnatley coming from that afrea of the photo which is something bolted to the block unless there is an oil line above it which is damaged, not sure. im trying to google the 4g63t dohc vr4 engine manual/components
 
From my experience oil can present itself sometimes no where near where it is leaking from maybe a not so close picture could help maybe that general area. Close-ups get kind of confusing sometimes(for me anyways)
 
From my experience oil can present itself sometimes no where near where it is leaking from maybe a not so close picture could help maybe that general area. Close-ups get kind of confusing sometimes(for me anyways)
yea its a little hard getting a decent photo as the engine is in a mitsi l300 van on its guts, so i can barely get under it to take photo, and engine also sits under passenger seat which makes things even more difficult haha
 
Oh snaps! Sorry you didn't have a vehicle profile so I assumed it was a vr4 haha. That does makes things a little trickier. Hmm is it a ton of oil? I know on mine the half moon was leaking, but even looking directly at it I couldn't tell. It's either that or if it leaking a lot then probably like synthetek said the oil galley plug. I am by no means a guru on these engines, but i have been all over mine the last 7 months on a daily basis so I have learned quite a bit from it.
 
Oh snaps! Sorry you didn't have a vehicle profile so I assumed it was a vr4 haha. That does makes things a little trickier. Hmm is it a ton of oil? I know on mine the half moon was leaking, but even looking directly at it I couldn't tell. It's either that or if it leaking a lot then probably like synthetek said the oil galley plug. I am by no means a guru on these engines, but i have been all over mine the last 7 months on a daily basis so I have learned quite a bit from it.
yea im trying to find on google where exactly the oil galley plug is, its def not the valve cover gasket either. hmm, it has me stumped at the moment haha
 
I will try to find a link to the digital FSM, but it might be tomorrow afternoon, because I have it saved on my laptop at work.
that would be awesome man, its not a daily driver van, more just weekends and the odd weekend at the track so im in no rush! she still starts and drives fine at the moment but i wont be after finding this leak haha thanks for your help mate
 
Try cleaning the area real good. And see where the oil starts forming again.
yea i want to spray with degreaser and take her down to car wash and spray off with water but now i dont really want to drive her haha. i will defnately jack her up tomorrow after work and degrease and somehow wipe it down and then check to see where its dripping from, such a mission being in a van i tell ya! i actually thought aout it, and the oil leak has gotten a hell of alot worse since i put thinner (semi-synthetic) oil in. but even still, the patch of oil on the road under the van after sitting there for 3 days, is about 1200mm by 600mm haha its a big puddle

for that leak to be that big, it seems like an actual oil line has come loose perhaps! and also for it to leak from above and onto the water thermostat housing is weird, i dont understand how it can leak so much from that high up on the side of engine without even having the engine running for 3 days
 
Ya that's def weird bro. What about the turbo feed line are you using the head location? Or is it plugged?
man im not to sure about that actually, i never did the conversion, and to even see the turbo, i need to get me head under the van which i cant even do without jacking her up cause shes on her guts haha. what do you mean using the head location though? or plugged?
 
Your turbo's oil feed line is either in a port of the head, or a port off the oil filter housing. So basically if it's in the head you will see a line coming off the the head above the thermo housing and towards the front of the motor. If not you will see a plug in its place, could be leaking. Right where the green circle is at in this pic.
 

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Your turbo's oil feed line is either in a port of the head, or a port off the oil filter housing. So basically if it's in the head you will see a line coming off the the head above the thermo housing and towards the front of the motor. If not you will see a plug in its place, could be leaking. Right where the green circle is at in this pic.
either/or, i rekon you could be onto something there, the oil feed to the turbo did cross my mind and if it runs between the cas and the thermost housing then it has to be that!
 
yea im trying to find on google where exactly the oil galley plug is, its def not the valve cover gasket either. hmm, it has me stumped at the moment haha

For reference (second pic, post #17), to the suggestion made by @synthetek: Massive Oil Leak , Video included

You'll note there are 4 of those plugs on the thermostat housing/CAS side of the head. Also note that the oil feed line port is the large open port to the up and to the right of the circled plugs in that second picture (or see post #12).
 
For reference (second pic, post #17), to the suggestion made by @synthetek: Massive Oil Leak , Video included

You'll note there are 4 of those plugs on the thermostat housing/CAS side of the head. Also note that the oil feed line port is the large open port to the up and to the right of the circled plugs in that second picture (or see post #12).
thanks mate, so your saying, on the thermostat housing, in total there are 5 oil ports? and the 1 above right of the circle which is open, is the main feed? how is there oil ports on thermostat housing? i had no idea. but the oil leak on my engine is leaking from between cas and thermostat and the whole thermostat is wet and dripping off the bottom of that down onto gearbox and everywhere else from there

the big opening to the left of the circle is the cas spot isnt it?
 
so your saying, on the thermostat housing, in total there are 5 oil ports? and the 1 above right of the circle which is open, is the main feed? how is there oil ports on thermostat housing? i had no idea.
On the thermostat housing's side of the cylinder head (i.e., the side pictured in pic 2 of post 17 in that link), there are a total of 5 oil ports, 4 of which are or should always be plugged. Those 4 are the ones that look exactly like the one circled and one of those could definitely be the source of your leak. The turbo oil feed is the 5th port and not where your leak is coming from if you are leaking from the area on the cylinder head between the CAS and thermostat housing. Just to be clear, the thermostat housing does not have oil running through it.

the big opening to the left of the circle is the cas spot isnt it?
The ports that are circled in the second picture are practically behind the thermostat housing if it was installed. The CAS would be in the location where the black circular plug is installed on the top head of that second picture. The big holes immediately to the left of the circled ports are for the thermostat housing (coolant only).
 
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