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Thread: Heat Exchanger Blow Out Reply to Thread
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  Topic Review (Newest First)
10-24-19 16:15
Jase36 So I Drained the oil and water, changed it all and put it all back together, except for the outlet hose from the oil cooler And ran the engine. Oil was coming out of the cooler from the hose that should have been going into the radiator.

So there’s your problem. Fitted the billet cooler and the bike is back to 100%. Checked all the systems again and all clear
10-07-19 22:15
Wiggie
Testing heat exchanger

Quote:
Originally Posted by Jase36 View Post
UPDATE

So the bike is home and I’ve spent a little time on it. From what I can see I believe the oil has been spat out the breather tube coming from the expansion tank. The water in the radiators is full of oil, but I’ve drained the oil from the engine and that is luckily free of water!

Going to get the radiators off and clean them through, I’ll then change the oil cooler when I have a bit of time and ordered it and give it a little run and check the system, if there’s no oil in the water I would say that’s the issue !
I had the exact same problem as you. I tested my suspect heat exchanger after removing it by forcing water from a garden hose into one of the coolant ports. It came out the oil port which of course it should not do. It took a while to completely flush both systems, but I don’t see why you’d want to remove the radiator to do it. I wanted the radiator in place to run the engine to properly remove all the contaminated oil. (I bought an OEM heat exchanger on eBay so I could get all the flushing done while waiting for a billet oil to air heat exchanger to arrive from the UK.)
09-21-19 17:41
Jase36 UPDATE

So the bike is home and I’ve spent a little time on it. From what I can see I believe the oil has been spat out the breather tube coming from the expansion tank. The water in the radiators is full of oil, but I’ve drained the oil from the engine and that is luckily free of water!

Going to get the radiators off and clean them through, I’ll then change the oil cooler when I have a bit of time and ordered it and give it a little run and check the system, if there’s no oil in the water I would say that’s the issue !
09-15-19 18:04
Plasmablaster
Quote:
Originally Posted by Jase36 View Post

Are people under the impression that itís better to plug the water hoses or should I bypass them to go back into the radiators?

Check this:


https://www.triumph675.net/forum/sho...d.php?t=246427
09-15-19 17:51
SweNick When I researched the problem a while ago I got the impression that it's rare for the head gasket to blow on the 675 engines. Lets hope it's only the heat exchanger on yours too.

Regarding plugging/bypassing there seem to be different opinions by different manufacturers of billet coolers. What makes most sense to me is to plug the connections, then all of the coolant flow goes through the engine. If you put a bypass tube instead of the heat exchanger a lot of the coolant flow will go there, because of less resistance, instead of through the engine block and top.
09-15-19 10:14
Jase36 Thanks for your help.

I’m praying this is the issue and not the head gasket. Once the bike is back from Spain I’ll get it taken apart and update what I’ve found.

Are people under the impression that it’s better to plug the water hoses or should I bypass them to go back into the radiators?
09-14-19 16:38
SweNick Hello, I'm also new here!


I had this problem on my STR 09 a couple of weeks ago. It did spit out a milkshake/yoghurt-like slimy mess from the coolant expansion reservoir overflow tube.



When I drained the fluids I saw that only the coolant were contaminated. I guess the oil pressure is higher than the water pressure, so it only goes one way (at least if the leak is small enough). I think for smoke to come out of the exhaust the oil must be contaminated.


I removed my heat exchanger and pressure tested it under water and it had an internal leak. I replaced it with the billeted air-oil cooler mentioned above and plugged the coolant connections. Don't know how it effects the oil temperature, but it seems to have worked for other people.


The worst part was getting the coolant system clean. It takes a couple of fluid changes to get the slime that sticks to all walls in the system out. Seems to be a lot of ideas of what to use. I used a 0,2-0,3 liters of degreaser (that I usually use when washing the bike/car).


Good luck
/N
09-14-19 11:06
Plasmablaster I'm out of answers at this point, sorry. Maybe more knowledgeable people could help.
09-14-19 10:49
Jase36 Thanks for the replies.

Unfortunately I have no idea as to the coolant used, I bought it as a road bike and simply checked it was at the correct level rather than going into it any further (doh).

So if it has blown externally which I believe it has (nobody saw blue smoke out the exhaust) has it burst out of the exchanger itself?

It’s very hard to tell where it’s come from when the entire outside of the engine is covered in the oil
09-14-19 08:21
Plasmablaster I don't have personal experience with that (thankfully) but from what I've read so far about this issue, yes, the symptoms you had can be from a blown heat exchanger. The exchanger can blow either inwards, mixing oil + water internally and you will tell by the blue smoke out the exhaust, or externally whereby you'll have spillage of oil/water outside.


Some people have made strong claims that the issue is partially due to non-recommended coolant pitting the aluminum walls between the oil and water. So, out of curiosity, if it proves to be the exchanger indeed, would you care to tell us what kind of coolant you had in the bike?
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