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Discussion Starter · #1 ·
Could anyone advise if they ha

Could anyone advise if they have experienced leaks in the cooling system header tank.

I've just replaced the pressure cap due to constant coolant loss via the overflow, and the increase in pressure has blown two holes in the tank, which turns out had been filled with silicone by a previous owner, so it was an old problem.

I've ordered a replacement tank made in heavy aluminium, but would like to hear of any stories you may have related to this problem.
 
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Discussion Starter · #2 ·
Pretty common if the coolant i

Pretty common if the coolant isn't changed regularly or the cars sit around.

Ethylene Glycol reacts with air to form organic acids. So if the cars sits there the acids build up in the tanks an rots it out. Buffers in the antifreeze slow this acid formation but they get depleted neutralizing the acid. Annual changes of the coolant will keep the buffer level up.

The earth friendly antifreeze uses Propylene Glycol which does not have this problem.
 
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Discussion Starter · #3 ·
My header tank on our old QV h

My header tank on our old QV had many holes it it. I took it to a local machine shop and had them fill in the holes until I could get around to replacing it (which I never did). After almost two years the current owner has not had any issues.
 
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Discussion Starter · #4 ·
brass and copper work harden,

brass and copper work harden, which means with thermal expansion and contraction from heat cycles the metal becomes harder and brittle. thus holes and cracks develop, not sure what the material is on the older tanks but a majority of European cars used copper or brass and thus the problem.

just last night I had to 'fabricate' from scratch a new rubber grommet for the tank level sender on the mondial for the expansion tank. there is no replacement for some odd reason, so I chucked a rubber suspension bushing into the lath and turned one out, works perfect. now I don't have to worry about boiling water
 
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Discussion Starter · #5 ·
Many thanks to you all for you

Many thanks to you all for your advice.

I replaced the header tank with the new aluminium tank, but unfortunately lost almost half of the coolant when she reached running temp. It was probably an air lock that caused such expansion, but I then realised the new tank was supplied with a cap rated at only 7 lbs, which is way below the recommended 12.8 lbs.

I have the 1.1 BAR rated cap supplied by the Ferrari specialist who serviced the car and I am told that this should be OK to use, although it is equal to approx. 15 lbs pressure rating.

I'll let you know how I get on, but keep your fingers crossed for me that I do not start blowing pipes etc. elsewhere in the system!
 
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Discussion Starter · #6 ·
Just finished trying the car o

Just finished trying the car out and everything seems to have held together pretty well. She ran normal temperature all the way and whilst idling in my garage, she got nice and hot, with no obvious problems - and more importantly, no loss of coolant.

I did notice a slight fuel leak on the right hand rear carb, so I guess I need to check this out next.
 
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Discussion Starter · #7 ·
Took the car for a spin on Sun

Took the car for a spin on Sunday morning and she ran well, then again whilst parking in the garage she blew some coolant out. I left her to cool down and checked the level, to find she had lost almost all her fluid again and therefore had been running much hotter than I thought, as the temperature sender was not recording the true temperature in the engine! The general concensus seems to be she has blown a head gasket on the exhaust side, which is pressurising the system.
I have a mechanic visiting tomorrow evening to test the cooling fluid for exhaust gases being present, which will tell us if our fears are correct. It seems unlikely to be a simple air lock, so we just hope the damage is not too bad 'financially', but it does seem likely it will sting quite a lot!
 
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Discussion Starter · #8 ·
Trevor,

Did you bleed the a


Trevor,

Did you bleed the air out of cooling system after re-fueling it?
 
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Discussion Starter · #9 ·
Hello Milton, I have drained a

Hello Milton, I have drained and refilled the system a total of five times now, with fluid obtained from the bleed points on both the thermostst and radiator.
I have just had the cooling system chemicaly analysed for exhaust gases, and thnkfully none seem to be present.
The engine and header tank all got hot during the testing, but the radiator stayed cold, so it now seems I have got away with the head gaskets, but could have a faulty thermostat or blockage in the cooling system somewhere, that is stopping or badly restricting the flow of the coolant allowing it to overheat and force it's way out of the header tank, which I guess would allow air into the system and double the effect?
Any thoughts?
 
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Discussion Starter · #10 ·
Trevor, pull the thermostat o

Trevor, pull the thermostat out, its an easy job. To test the thermostat, place it in cold water, and check to see if it is fully closed. Now, bring the water to boiling and observe to see if it fully opens. Let me know what happens.

Regards,

Milton
 
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Discussion Starter · #11 ·
As you stated, the previous ow

As you stated, the previous owner had "filled the tank or holes with silicone" You might check for a blockage at the radiator inlets. Maybe a simple test with a garden hose to check flow at various points in the system. disconnect various cooling system hoses and use the garden hose to make sure that area tested does have flow. Low cost test for sure, Or remove radiators and have them flushed. We have seen oil lines plugged with silicone by people that go crazy using it on engine gaskets. Stuff breaks off and travels everywhere inside the engine.
 
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Discussion Starter · #12 ·
It takes several tries to get

It takes several tries to get all the air out to the radiator in those long lines.....also helps to park uphill...try that a few more times sounds like an air pocket there, to me.......
 
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Discussion Starter · #13 ·
My Pantera did that. we had to

My Pantera did that. we had to jack up the rear end of the car about as high as we could get it, and you could hear the cooling system "burp" the trapped air. you could see the air arrive into the surge tank. It would overheat everytime until we burped it. We did try it parked up a steep hill and that would work also.
 
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Discussion Starter · #14 ·
To all of you who have offered

To all of you who have offered advice, I am most grateful. `However, I am now under orders from my better half to leave the ******* car alone for a while and get our new kitchen installed, as she is fed up with living with/cooking in the building site we currently have in place of a kitchen - So I guess I will have to pick my moment to disappear into the garage to have another tinker! I will definately start with removing the thermostat and see how we go from there.
 
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Discussion Starter · #15 ·
Did exactly that last year, st

Did exactly that last year, stopped working on the race car rebuild, and remodeled the kitchen.
I did all the electrical, plumbing, and mechanical. Cabinet guy took 4 months to deliver the cabinets. Race car sat in the shop. Kitchen finished,,, told other half that no more house work until the race car is finished, so what goes around, comes around!
 
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Discussion Starter · #16 ·
Hello All,
The latest is that


Hello All,
The latest is that during a short break from working on the house, I managed to strip the thermostat out which revealed perfectly clean waterways and a fully operational thermostat.

As a precaution, I have purchased a new thermostat with new gaskets and rubber seal, but will try to get the system flushed thoroughly before I install them.
One Problem is the drain tap on the radiator seems to be jammed fast and I am nervous about applying too much pressure.
does anyone have a tip on how to drain the system without getting the antifreeze everywhere?
 
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Discussion Starter · #17 ·
If you must remove the lower h

If you must remove the lower hose to drain the coolent, go to the home repair store and get a large plastic concrete mixing tray to catch the coolent. I use one for protection of spills even for oil changes. and they are cheap!
How did your kitchen come out?
 
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Discussion Starter · #18 ·
Hello Bob, unfortunately we ha

Hello Bob, unfortunately we have had some problems with the new plaster on the ceiling which has delayed us, and our new cooker is faulty, so we have a 4 week wait for a replacement, but at least this has created an excuse to have a tinker with the car!!!
Hopefully I can make some progress this weekend with both projects!
 
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Discussion Starter · #19 ·
Hey Trev,
site is ki


Hey Trev,
site is kinda quiet so I thought I would stir it up. Do you think that Ferrari has any engineers that could help with the plaster problem. If it was a Formula One solution, I'm sure that your ceiling would be Carbon fiber. I just got the race car running only to find that the transaxle will not shift from 2nd gear to 3rd gear. Did'nt have these problems with my kitchen remodel. Tell me again why we do this car stuff?
 
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Discussion Starter · #20 ·
Hi Bob,

I guess it's ju


Hi Bob,

I guess it's just that feeling you get when it finally goes right!?
 
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