How can you tell if it is Turbo's or the motor (Coolant in the exhaust)
Thread Starter
Joined: Mar 2002
Posts: 427
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From: Ohio, Columbus
How can you tell if it is Turbo's or the motor (Coolant in the exhaust)
Hello,
I picked up a 1993 that sat for some time (1 - 1.5 years) and purchased it with the expectation of needing a motor. Then got it home and was able to get it up and running. Either way the issue is that I have coolant leakiing out of the down pipe and off the botom of the twins. I have ran a basic compression test (Napa basic compression tester) and it shows about 110 - 115 per rotor. Ideas on how to test the turbo's before pulling them off the car (Car has 94,000 miles on the odometer)?
I searched the forum for coolant and turbo troubleshooting and did not see any tests related to coolant in the turbo's (If they exists).
The primary boosts to 8 psi, but the secondary has not boosted yet (That could be another issue)
The car is bone stock with the exception of a down pipe and an old school greddy cat-back.
I picked up a 1993 that sat for some time (1 - 1.5 years) and purchased it with the expectation of needing a motor. Then got it home and was able to get it up and running. Either way the issue is that I have coolant leakiing out of the down pipe and off the botom of the twins. I have ran a basic compression test (Napa basic compression tester) and it shows about 110 - 115 per rotor. Ideas on how to test the turbo's before pulling them off the car (Car has 94,000 miles on the odometer)?
I searched the forum for coolant and turbo troubleshooting and did not see any tests related to coolant in the turbo's (If they exists).
The primary boosts to 8 psi, but the secondary has not boosted yet (That could be another issue)
The car is bone stock with the exception of a down pipe and an old school greddy cat-back.
when you used the standard compression tester, did you remove the schrader valve so it would read each side of the rotor independently? It sounds like your coolant leak is a split hose, possibly the coolant hose that runs to the throttle body. I'd say replace EVERY coolant hose with new coolant hose. I know the twins are oil cooled, but i'm not sure if they have a coolant line running to them. It would be very hard for the actual motor to be leaking coolant down your downpipe. If you have coolant running OUT of the downpipe, then i have no clue where it could be coming from. good luck
Joined: Nov 2001
Posts: 1,898
Likes: 13
From: Metairie, LA near new orleans
Do a pressure test on the coolant system..if the pressure starts to fall after u pressuized it then there is a leak somewhere...Its possible for the turbos to leak as this happen on my TII..
Marshall
Marshall
Rotary Enthusiast
Joined: Dec 2002
Posts: 1,224
Likes: 2
From: Bonita Springs Fl
Originally Posted by whitey85mtu
when you used the standard compression tester, did you remove the schrader valve so it would read each side of the rotor independently? It sounds like your coolant leak is a split hose, possibly the coolant hose that runs to the throttle body. I'd say replace EVERY coolant hose with new coolant hose. I know the twins are oil cooled, but i'm not sure if they have a coolant line running to them. It would be very hard for the actual motor to be leaking coolant down your downpipe. If you have coolant running OUT of the downpipe, then i have no clue where it could be coming from. good luck
Thread Starter
Joined: Mar 2002
Posts: 427
Likes: 0
From: Ohio, Columbus
OK.. Maybe I should have asked a more specific question. If the secondary turbo is not spooling, water/coolant is going into the exhaust and dripping out of the down pipe can I check the turbo on the car to see it it is bad (causing the coolant in the exhaust)?
Let me know...........
Yes the factory twins are water and oil cooled..
Let me know...........
Yes the factory twins are water and oil cooled..
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The coolant hoses that feed coolant to the turbos are prone to failure. I'd start with those. It's IMPOSSIBLE for there to be an internal water leak in the turbos - the water jacket is TOTALLY separate from the bearing housing, so coolant can't get into the exhaust from the turbos. Oil, yes, but not coolant.
Most likely, one of those hoses is bad, and spraying coolant all over hot components, making a big mess. Find and fix the easy stuff first. The turbo coolant hoses are relatively easy to get to with the air pump out of the way. Only replace the hoses with NEW MAZDA PARTS. The Mazda hoses are made of heat-rated rubber that can withstand the intense heat that close to the turbos. Mazda re-did all the coolant hoses on the car with high quality rubber, but many cars still have the original factory hose.
Dale
Most likely, one of those hoses is bad, and spraying coolant all over hot components, making a big mess. Find and fix the easy stuff first. The turbo coolant hoses are relatively easy to get to with the air pump out of the way. Only replace the hoses with NEW MAZDA PARTS. The Mazda hoses are made of heat-rated rubber that can withstand the intense heat that close to the turbos. Mazda re-did all the coolant hoses on the car with high quality rubber, but many cars still have the original factory hose.
Dale
Joined: Nov 2001
Posts: 1,898
Likes: 13
From: Metairie, LA near new orleans
Originally Posted by DaleClark
The coolant hoses that feed coolant to the turbos are prone to failure. I'd start with those. It's IMPOSSIBLE for there to be an internal water leak in the turbos - the water jacket is TOTALLY separate from the bearing housing, so coolant can't get into the exhaust from the turbos. Oil, yes, but not coolant.
Dale
Dale
