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Old 06-28-2015, 04:10 PM   #1
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ISL370 Coolant Leak Metal Tube Passenger Side

Noticed a puddle under the engine. Crawling underneath I find a metal tube on the passenger side about 1/4 back from the front of the engine, about 2-3" below the head. (Beneath these, I see three now went sensor probes in the block. Suspect temperature and oil oil related.)

The flange nut holding the tube onto the right angle coupling coming off the block, seems to be the source of the leak.

The tube moves back towards the rear of the engine, but I lost it trying to trace where it goes.

Can't quite reach the metal flange nut with my current set of tools (on the road now), but will go buy one if just tightening the flange nut might take care of it.

So, anyone know from my description what this metal tube is? And, is this the kind of flange nut that just tightening/cinching a bit tighter will stop the leak? Or, is it something that has a gasket inside that needs to be replaced at the same time?

TIA, and best to all,
Smitty
04 ISL370 CAPS Engine
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Old 06-29-2015, 02:12 PM   #2
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Was able to borrow a wrench that would get up and fit the flange nut. Snugged it up tight about 1/3 - 1/2 turn. Dried the area, waited 90 mins, still dry. Added 2 gallons of 50/50 Final Charge to the radiator tank, so it had been leaking enough to lose some volume. Will be leaving 7/5, and will recheck everything at the end of that day's travel. If no more leaks, we'll call this one done...

Best to all,
Smitty
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Old 06-29-2015, 04:38 PM   #3
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Hopefully it was just the fitting. It's nice when you can find something simple when expecting the worse.
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Old 06-29-2015, 07:11 PM   #4
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Quote:
Originally Posted by Dutch Star Don View Post
Hopefully it was just the fitting. It's nice when you can find something simple when expecting the worse.
And that is such the opposite of the norm, that I've advised my wife that I give it a 50/50 that we won't find something else is leaking too!

I've checked all that I can readily see from below with a flashlight. And best I can tell I'm still seeing some residual drops making it to the ground. Figured after 24 hours of sitting, if I don't see the puddle disappear, that I'll get under the coach again to recheck everything.

Fingers crossed that this fix will stay fixed! If not, we'll do what we need to do get it resolved.

I figured that after 10 years of heating up and cooling down, adding a dash of vibration while on the road, the coupling flange nut worked it's way loose.

Best to you,
Smitty
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Old 06-29-2015, 07:23 PM   #5
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Fire the engine up Smitty and allow it to heat up a bit in order for the cooling system to build some pressure........Then inspect again.
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