chocolate mousse in the radiator

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Mrsmackpaul
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Re: chocolate mousse in the radiator

Post #21 by Mrsmackpaul » Sun Apr 02, 2017 9:39 pm

With out knowing how much you have apart can you seal up both ends of the cooling system ( disconnect the radiator and plug each radiator hose) and the pressurize it with the sump off and see were the coolant is coming from
This takes a lot of guess work out of it
I wouldnt go any more than 30 psi

Oh and make sure its full of water when you do this

I must be a tight ass as I dont like throwing money at a problem and hoping it will fix it, although some times we have no further option but I prefer to prove as much as I can before spending my hard earned

It is important to leave the radiator out of the system I feel as they are the weakest spot on a cooling system and dont handle to much pressure very well and we know the problem isnt there anyway so no point in wrecking it
If a liner is shot you may have wind the motor over slowly by hand to expose the leak

Paul
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FOWLER MAN
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Re: chocolate mousse in the radiator

Post #22 by FOWLER MAN » Mon Apr 03, 2017 1:19 am

Hi Kevin,
I've stayed out of this one till now, it's impossible to say what is causing your problem without being hands on and even then, as you well know, it can be very difficult to pin point.
What Paul says about pressure testing makes good sense. I don't think the leak to the sump would be affected just by the engine being warm but when you stop a hot engine the cooling system is pressurised.
The pressure is controlled by the pressure, (filler), cap and may be as much as 7 lbs sq. in. that may well be enough to force coolant past a dodgy "O" ring until that pressure has dropped off.
No one has mentioned the cylinder head yet, but Is there an engine recon shop near you that could pressure test the head while you've got it off should the need arise?
Good luck.
Fred


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magnetman
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Re: chocolate mousse in the radiator

Post #23 by magnetman » Mon Apr 03, 2017 10:59 am

Thanks Guys, good points you make...
currently , head and sump are off and one piston is out waiting new rings, frankly, if I could get hold of the right puller, I would change all the liners as a matter of course, but I dont have one of those and getting the liners out is a swine!,

pressure testing is going to be hard, as tractor is in my barn which is about 300 yards from nearest tap, i will have to work something out...
re the pressure of a hot engine when switched off, I am ashamed to admit that the radiator filler cap surround needs re-brazing so leaks like a sieve, so system is not actually under pressure at all....

Paul, I am fascinated by this"If a liner is shot you may have wind the motor over slowly by hand to expose the leak"

where would I see the leak? are you saying to rebuild the top end but leave the sump off and turn it over by hand ?

sorry to be dim....

Kevin


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Re: chocolate mousse in the radiator

Post #24 by Mrsmackpaul » Mon Apr 03, 2017 11:24 am

If the hole in the sleeve is past one of the rings and the piston is a bottom dead center it may cover the leak and yet not let compression thru

Hearing how for your into it I would now just pull the sleeves, most people just make a puller out of some large threaded rod and a couple of bits of thick steel plate
You can use all sorts of stuff up top to give clearance
If you find some pipe bigger than the sleeve you can use that
I would also check that the head is still flat and check it for cracks as well
Fred is pretty switched on bloke and he has a lot more experience than me at this stuff, I am just a self taught farmer that fixes my own gear and mates of mine as well

Paul
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magnetman
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Re: chocolate mousse in the radiator

Post #25 by magnetman » Mon Apr 03, 2017 5:28 pm

Hi Guys, just found a potential answer...
put the old head gasket on the head and noticed by the carbon marks that it was not aligned true, the ferrule from one cut-out was actually in a waterway....
still confused why it should take over 12 years to manifest as a problem, but guess the low use of the tractor, and not re-torquing the head after initial assembly might have something to do with it!


will re-build it up now, (with some studs to act as locators) and will let you know if it is watertight....
I have always assembled head gaskets dry, but know some people swear by some kind of sealant.. what are your thoughts?

thanks

Kevin


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Re: chocolate mousse in the radiator

Post #26 by hair bear » Mon Apr 03, 2017 10:25 pm

We used to smear them with grease! I have no idea why, it was something my dad always did and on the now rare occasions that I get so desperate with something that I take the head off I do too.


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Re: chocolate mousse in the radiator

Post #27 by magnetman » Mon Apr 10, 2017 12:14 pm

Update:

Hi Guys, got head back on and built up( why does the manual give you a head torquing sequence, when you cant access 3 bolts when the valve gear is on? and why tell you to set valve clearances to 20 thou "hot" when you are building up a cold engine!)

anyway, I found an old gouge on the engine block, between a waterway and oilway, maybe not the problem but I filled it with epoxy anyway...

found a broken piston ring, replaced that.
got engine started, went straight out and did 3 hours of chain-harrowing, and this morning found no water in the oil, so think probably OK....
radiator has sprung a leak though, so will be using barrs leaks as insurance...


by the way, how much oil should be in these things? my operators manual says 9 pints, but my shop manual says 8.3 quarts!


thanks for all your help and support!

Kevin


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