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  #16  
Old 01-27-2014, 02:31 PM
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Quote:
Originally Posted by ah-kay View Post
Be my guest.
I have used a tee-ed in pressure gauge to diagnose a leaking head gasket in my VW before tearing into it. All fixed now.
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  #17  
Old 01-27-2014, 02:58 PM
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It does not alter the fact that it is much ado about nothing. I am done with this thread.
You could have saved yourself some time and refrained from posting five replies to a thread that is "nothing".

*shrug*


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Originally Posted by tjts1 View Post
That's a good idea. This could be especially useful to those of using driving an OM603 + #14 head.
EXACTLY. The primary symptom of a failed #14 head crack is excess pressure in the cooling system. Jeremy has helped answer the question, "what is NORMAL pressure".

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  #18  
Old 01-27-2014, 03:28 PM
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I know my #14 head is leaking combustion gasses into the cooling system, has been for at least the 20k miles I've owned it. I put a colder 71c thermostat in it and and lower pressure coolant reservoir cap. I can hear it hissing away even after a short drive with the engine still cold. So long as it doesn't consume any coolant or oil I'll keep driving like this. The #17 head is stashed away in the garage. One of these days I'll get around to swapping it in. If I was still running at 90c all the time with a high pressure coolant cap I would definitely add a pressure gauge.
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tits = worse & worst.
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  #19  
Old 01-27-2014, 03:38 PM
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I know my #14 head is leaking combustion gasses into the cooling system, has been for at least the 20k miles I've owned it. I put a colder 71c thermostat in it and and lower pressure coolant reservoir cap. I can hear it hissing away even after a short drive with the engine still cold. So long as it doesn't consume any coolant or oil I'll keep driving like this. The #17 head is stashed away in the garage. One of these days I'll get around to swapping it in. If I was still running at 90c all the time with a high pressure coolant cap I would definitely add a pressure gauge.
You can drive it with the cap loose, but you must watch the temp gauge closely. Don't let it go over 100C with the cap loose. This reduces the strain on the hoses and water pump seals, which are otherwise getting full rated pressure of the cap (1.2/1.4 bar) due to the abnormal pressure entering the system.

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  #20  
Old 01-27-2014, 07:14 PM
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Originally Posted by gsxr View Post
You can drive it with the cap loose, but you must watch the temp gauge closely. Don't let it go over 100C with the cap loose. This reduces the strain on the hoses and water pump seals, which are otherwise getting full rated pressure of the cap (1.2/1.4 bar) due to the abnormal pressure entering the system.

I have the electric cooling fans triggered at 87c using a BMW temp switch. Normally it stays at a hair above 80c and I don't think I've ever seen it above ~95c even on the hottest summer days.
I'm on borrowed time with this head. I told myself I was going to replace it last summer and I didn't. Maybe this summer. Its hard to get myself to tear apart the engine when its running so well otherwise.
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