Are the two different?
I have been having a problem with coolant puddling under the UIM between the block and LIM. I know its the stupid orings.
I pulled the turbo and UIM manifold, found my LIM gasket torn and crimped above the rear coolant oring.
When I removed the LIM, I found the oring was flattened and distroyed. i noticed two things the oring that was in there was squeezed big enough to actually rip the LIM gasket. I also found ther to be no recession on the block or LIM for the oring to sit in like the front one does.
Is the oring on the back passage different, bc I just replaces the gaskets and orings with new ones from my parts guy and the same **** happened the rear oring got squashed and crimped and ripped the gasket the same way and im not about to put my turbo and manifolds back on for it to do this again. Id like to stop this bs.
thanks
James

 

use a little vaseline or rtv to hold the orings into place. make sure to use new orings and a new gasket. there should be a recession on the block for the orings to go into.

 

thers only 1 recession on the front housing, none on the rear. maybe the rotor housing is different from the front? if thats the case wtf should i do? and which rotor housing came w/o recessions? all parts are new stait from mazda

 

Wrong rotor housing for sure. Look at the top left of the rotor housing. IT should have a R stamped on it. The front one should have ......yes, a F on it.

If it has a R on it, then it's a non turbo housing. Guessing. Only thing that makes sense.

 

my front rotor housing does not have a passage for the coolant, but it does have the recess for the o-ring.

I assume mine is normal. I am a little confused. Do you have the passage, and no place for the o-ring, or no passage AND no recess for the o-ring?

 

Well, found out its an fd housing in the rear.
Theres no coolant passage or recession.
I am aware, that I need that coolant passage in the rear for the turbo.
I beleive am left with no choice but to drill the passage out and create some type of recession for an oring to properly seal it.
After looking at it throughly, I beleive it would be best to put the recession on the LIM. Unless any of you can come up with a better solution.
thanks,
James

 

If I am understanding your issue, then it could be as simple as finding another source for turbo coolant.

okay, so you have NO WATER passages in the rotor housings? If you do not, then you don't need the o-rings.

Don't use the water passage on the LIM! Use a water supply from somewhere else to feed the turbo (Heater hose, etc)

 

You are correct I can do that. when i go full single im gonna have to use a different water source anyway, right?

 

most aftermarket single turbos are oil cooled only.

if you are using a stock turbo maybe you could use the nipple on the rear iron or on the back of the waterpump housing.

 

wheres the most ideal spot for the turbos coolant return? can I use the rear iron?

 

I am having trouble with remembering, but isn't the return on the water pump housing. Why can't you just keep using this as the return?

 

the stock FEED line is on the back of the LIM, this is the one you would block off if running most aftermarket t4 turbos. you would still need to get the leaking problem addressed though.

 

There won't be a leaking problem, if I reroute the return line, I believe it is, bc the feed comes from the waterpump. Then there will be no coolant in the rear part of the manifold at all. Problem solved I just have to make a plate to cover the hole in the lim for cosmetic reasons. With the elimination of coolant to the rear of the manifold it should lower my intake temps just a tad, no?

 

The RETURN line from the turbo goes to the waterpump. THe Feed line is that line from the LIM. (As stated by 87 T66)<--I checked the FSM and this is correct.

Therefore, you need a new feed. The return will be the line on the lower part of the water pump housing.

I am wondering how you haven't cooked your turbo!?! There shouldn't have been any water going to it.

Are you sure that both housings are "blanked" off? Neither of them has a hole going to the water jacket?

If this is the case, find a new feed source, then blank off the line coming from the LIM (for cosmetic reasons). You shouldn't have any need for the o-rings if there is no water going through the LIM.

Hope this helps!

Rob

 

The front housing has coolant going to it but theres a recession for the oring there so theres no problem. the car wasnt drivin much, it was base tuned to putt around town for about a month or so, about a month ago. soo it wast really too warm out. i found the coolant leaking and put it back in the garage again. will it be fine to use the read iron as a new feed source?

 

Wait.. Wait!

You have a feed source from your front housing! If you don't somehow block this off (if you choose to use a different feed) it WILL LEAK IN THE SAME PLACE!

Okay, now it sounds like you are a little screwed!

I wonder if you could get away with the o-ring on the one side and none in the FD housing side?

ANy chance you could take a picture of this?

 

A stock turbo engine has a water passage in the Front and Rear rotor housing.

The intake manifold has but one hole for water feed, the one in the rear.

A stock engine needs two o'rings because of this.

 

You have an S4 front rotor housing and a FD rear?? Wow, shoot your engine builder, they have completely different spark plug locations!

And yes, what everyone has suggested already. If the rear rotor housing has no coolent hole, dont waste your time drilling it and recessing it for an O-ring. Just use another source for your turbo SUPPLY line, like the rear iron.

~Mike................

 

what does he do about the coolant passage in the front? Having one o-ring in the front, and none in the rear will make the gasket sit crooked won't it?

 

It'll leak without a o'ring. Your right. In fact that's where his leak is now because it couldn't be the rear one.......unless the water was coming from the return line. This thread is confusing.

The flow of the coolant in the engine can be seen in the Cooling section of the FSM. Has little arrows etc showing the direction of the flow.

 

yes, Hailers my threads are usually confusing lol. It was the rear that was leaking, I know for a fact, from the turbo coolant not having anywhere to go except thru the a fucked up oring that wasnt seated and my LIM gasket. Hailers why will it leak w/o an oring if coolant is removed?
thank you guys
james

 

It'll probably leak. But if the gasket is one of the paper material type of gasket, you Might be able to get away with a film of RTV on both sides of the gasket in that area. Might work. Might not. If it does not work, then you went through a lot of trouble to find out.

I don't think you'll be able to make a recess in the housing that'll work.

 

It will leak because coolant will be coming through the front passage and will "fill-up" the manifold passage.

 

Mine has two holes. Are the JDM and USDM different?

 

There is no front coolant passage in the manifold coolant stops at the front oring