where is the coolant coming from? 426 Hemi "UPDATE"
#1492417
08/29/13 01:07 PM
08/29/13 01:07 PM
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Joined: Aug 2003
Posts: 7,063
Indiana
maxie
OP
master
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OP
master
Joined: Aug 2003
Posts: 7,063
Indiana
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The last couple of days I have been seeing coolant on top of the oil pump. I dont remember if the hemi is like a wedge and header bolts go into the coolant. I am finding the coolant on the inner piece of the housing where the outer piece of the housing goes up against it. There is a low area there. We are talking about less than a thimble off coolant a day. Motor has less than 20 miles on it and is all new parts.
Last edited by maxie; 09/01/13 04:24 PM.
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Re: where is the coolant coming from? 426 Hemi
[Re: maxie]
#1492418
08/29/13 01:38 PM
08/29/13 01:38 PM
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Joined: Dec 2005
Posts: 293
Kansas City Metro
mbogina
enthusiast
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enthusiast
Joined: Dec 2005
Posts: 293
Kansas City Metro
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IIRC, the front header bolts on No. 1 cylinder go into the Head bolt hole, the rear 2 are blind but if they are drilled too deep they could break into water, if so, a bit of silicone will fix it. Also possible that you are leaking at the top front corner of head and the coolant is running down front edge of head onto oil pump.
Be a Rebel- Break the Laws of Physics!
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Re: where is the coolant coming from? 426 Hemi
[Re: HemiDart68]
#1492421
08/29/13 04:38 PM
08/29/13 04:38 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Quote:
Hemis have a habit of leaking at the front and back of the heads at the large coolant passages(see outward bump in head casting),pressurize the system amd check these areas for coolant leaks. 
Yep. Sometimes if it just a suttle leak radiator pellets will fix it. Go to a GM dealer and buy them, they work really well.
Always check the head gaskets in this area since the block and heads coolant holes vary from manufacture to manufacture.We usually put silicone around these areas for extra insurance.
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Re: where is the coolant coming from? 426 Hemi
[Re: B G Racing]
#1492422
08/29/13 05:05 PM
08/29/13 05:05 PM
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Joined: Jan 2012
Posts: 2,649
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,649
Stuttgart, Arkansas
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I have had that happen when I put the head gaskets on dry per the manufacturers specs. So then I had to take the heads back off and spray copper coat on them like I wanted to do in the first place and then they didn't leak. As said above, the exhaust bolts and the head bolts are dry on a hemi.
2011 Drag Pak Challenger
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Re: where is the coolant coming from? 426 Hemi
[Re: maxie]
#1492424
08/29/13 06:12 PM
08/29/13 06:12 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I add a bottle of Bars Leak to every build I do.. I silicone the head and exhaust studs also, just in case they are drilled deep... then the bottle of stop leak is just insurance 
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Re: where is the coolant coming from? 426 Hemi
[Re: dogdays]
#1492425
08/29/13 06:25 PM
08/29/13 06:25 PM
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Joined: Jul 2009
Posts: 413
Norway (old world)
Oyvind Mopar
mopar
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mopar
Joined: Jul 2009
Posts: 413
Norway (old world)
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Quote:
Pellets you can find in the plastic bottles of Bars Leaks at your local WalMart. Not the absolutely cheapest version, the next step up in price. The bottle is clear in some areas, be sure to shake it up so all the little pellets roll out into the radiator.
For the head gasket water leaks I would suggest that blue Rolls-Royce stuff (forgot the name but it is better than silicone for this application.)
R.
Blue Hylomar!
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