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Engine leaks coolant when warm...

Old 08-23-10, 09:28 PM
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Engine leaks coolant when warm...

Okay, if you saw my other thread you may know where this is going. I have a 13BT (Series IV) that is starting/idling/revving fine with an AEM EMS. But when it warms up the car is pissing coolant out the exhaust... I emailed my engine builder who said:

I don't think there would be an internal leak that would show up warm. Most show up when cold as parts are contracted, not expanded. I wonder about some of the cooling stuff of the intake.
Since the car last actually ran, I performed the "throttle body mod" ... and it's possibly I screwed that up. Or that the intake gasket(s) have failed over the years of this car going together and coming apart.

Anybody have any ideas where we should look/check?
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Old 08-23-10, 10:43 PM
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Are you sure its coolant and not condensed water vapor?

I would definitely check the throttle body/IAC/etc that you might have blocked off or could otherwise be leaking.
Questions I would have are:
do you have a pronounced miss in the engine?
have you pulled the plugs after running to see if the rotor looks "wet" or smells of coolant?

Cheers,
Don
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Old 08-24-10, 10:29 AM
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pressure test cooling system. just about every mechanic has the tester set.
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Old 08-24-10, 11:34 AM
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Hey Don, I've still not personally heard this motor start (even though it was built in 2004), so the only details I have are "internal coolant leak" and "coolant out the exhaust." These guys should know the difference between water vapor and condensation. Although, the dyno shop claimed to know how to build rotaries on their webpage, but push-to-shove and now they "don't know much about them."

The shop is going to pull all the intake and throttle body stuff and check the turbo as well... for a water-cooled turbo is it possible to lose a seal there and puke water in to the intake?

I threw out the idea of the pressure testing, we'll see if they give it a shot. Hopefully it really is something simple after all.

Thanks guys.
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Old 08-24-10, 09:33 PM
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Well unfortunately I know very few people out in the Bay these days, but if you were closer I would be glad to help. I will see if I can find any of the people I used to know out there and see if they can give you a hand. Feel free to pm me who your working with and if they are open to the idea I might be able to help them.
It IS possible
Cheers
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Old 08-26-10, 11:09 AM
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Sorry for the slow response. Yesterday was super busy at work. Right now they're committed to pulling the throttle body and intake as Daryl suggested, so we'll see if they find anything there, if not I'll move on to next steps if that works for you? They're not going to get to it until next week some time...
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Old 09-13-10, 03:48 PM
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Okay, shop found a pinched intake gasket... which led me to wondering why I even have coolant running up to the intake any more since I removed all that crap from the throttle body. They say the turbo is getting water from up there... that seems less than ideal to me... can somebody throw some pictures up of a better way to run the water through the turbo? Please? Thanks!
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Old 09-14-10, 02:03 AM
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Please? We're really struggling with this. The car seems cursed since the build started over a decade ago...
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