• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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Coolant system pressure test?

Jon

Jon

Husqvarna
AA Class
I'm trying to do a coolant system pressure test on my 13 txc310. Have a matco pressure tester with a bunch of different adapters but none of them fit the radiator. Anyone know the size that fit the radiators. I don't want to just guess at buying the right adapter.

I have been using coolant and need to fill up multiple times a day. I rebuilt my waterpump and that seemed to help a bit but still using it. I have drained my oil and haven't noticed anything coolant in the oil. So I'd like to do a pressure test and see if I can find out where its going before I start taking the engine apart.
 
Well it is either going in the engine into your oil or outside the engine where you should smell it.

Do you smell it?

My 2 stroke had a slow leak for years that I never smelled that was leaking out of the hose but since the 2 stroke runs much cooler I never smelled it.
4 stroke you should smell.
 
no haven't smelt any coolant.
So I am thinking it is going into the oil but would like to just run a pressure test but need to find the correct size for the radiator.
I was having a problem with rad hoses getting cut from the gas tank clearance even with spacers, but I think (knock on wood) I have solved the problem there.
 
Jon said:
no haven't smelt any coolant.
So I am thinking it is going into the oil but would like to just run a pressure test but need to find the correct size for the radiator.
I was having a problem with rad hoses getting cut from the gas tank clearance even with spacers, but I think (knock on wood) I have solved the problem there.
Click to expand...

It's a bad cap, I bet- unless your oil level is rising or the oil is milky or the exhaust is "wet".

You could probably pressurize your system through the overflow... but I don't know how you would monitor it. Maybe sacrifice an old cap (KTM guys change 'em a lot) and remove a portion of the lower seal. And put a tee with a pressure gauge on the overflow. This would test everything but your cap- which is probably bad.

I suppose there is a slight chance your crossover hose has a pressure leak (and leaks mostly vapor), but it seems to me you'd smell that too.

good luck.
 
I replaced it with an unrelated issue, I was riding at an ohv park came back to the truck for a break and checked my coolant and topped it off and forgot to either put the cap back on or tighten it and realized within the 1st couple seconds of riding afterwards that it was missing so that ended my day there.:banghead: So had to buy a new one after a lengthy search for the one I lost.
 
Jon said:
...topped it off and forgot to either put the cap back on or tighten it and realized within the 1st couple seconds of riding afterwards that it was missing ....
Click to expand...

yeah, I did the same thing with the stock cap. I couldn't find it either- I can only think that I was not turning it all the way tight. The newer cap (a Myler's with "ears") is a 100% better.

So, were you losing coolant before with the old cap?
 
ya was having the same issue, has not gotten any better or any worse with the new cap.

I just want to run a pressure test and see if I can chase down the leak or see if its filling up the cylinder before I tear into the top end.

I bought all the gasket and stuff to do a top end minus the actual cylinder and piston, ill get those if it comes down to it but would rather not spend the money if I don't have to.
 
Well, maybe use a small hand pump (like a kids ball pump) and pressurize the system through the overflow hose as above (I wouldn't go greater than 10psi.... hence the ball pump)- and give her a listen. Maybe you could rig up the Matco pump.

If vapor was/is going into your combustion chamber, the piston crown will be clean of carbon and, most likely, so will the valves. Shiny clean.

I'm guessing you checked your hose clamps (especially the x-over hose) for tightness.

good luck.
 
yes have checked the clamps, I also have the silicone hoses installed with the thermostat deleted. Also I started the bike up and let it get up to operating temp then I shut it off and pulled the tank quick and plug then used a bore scope to check the top of piston and it looked like there was carbon build up on it. Definitely not clean so not sure.
 
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