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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406386
03/22/13 10:15 AM
03/22/13 10:15 AM
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JohnRR
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Quote:
That is what I thought but the Haynes Chrysler big block rebuild manual states otherwise as does the Chilton's. Both claim to use sealer on the bolt threads. I have a very small amount leaking, level doesn't go down and doesn't show on the stick but I saw a couple drops of green when I pulled the valve cover to check lash.
Sorry but both of those books are WRONG .
What heads are you using ?
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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406390
03/22/13 10:33 AM
03/22/13 10:33 AM
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JohnRR
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Quote:
915's and the manual says RTV
What head gaskets ? were the heads and block surfaced during rebuild? ... assuming it was rebuilt ???
Otherwise get the engine up to operating temp , release the pressure on the cooling system , pull the valve cover and put a pressure teser on the raditor and pressurize the system , go up a little above 16 , if it's leaking you'll see it them go from there ... did i say the books are WRONG ...
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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406392
03/22/13 10:55 AM
03/22/13 10:55 AM
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Joined: Nov 2008
Posts: 1,565
tennessee
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pro stock
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pro stock
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tennessee
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Quote:
motor was rebuilt 2 years ago, heads were milled slightly, used the thinner fel pros to keep compression up. changed oil and no sign of coolant in oil, must be very small leak cause like I said just the small drops of green by the bolts. car runs awesome. thanks for advice and will do the test, although am thinking about just sealing the bolt and try it, could it hurt?
 That's what I would try first.
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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406395
03/22/13 11:56 AM
03/22/13 11:56 AM
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JohnRR
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Quote:
motor was rebuilt 2 years ago, heads were milled slightly, used the thinner fel pros to keep compression up. changed oil and no sign of coolant in oil, must be very small leak cause like I said just the small drops of green by the bolts. car runs awesome. thanks for advice and will do the test, although am thinking about just sealing the bolt and try it, could it hurt?
Yes just put sealant on all the bolts , that will tell you if the head bolt hole is damaged ... because it is not supposed to be in the coolant ... if it still leaks then it's either the head gasket or the head is cracked ...
Good luck
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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406396
03/22/13 10:47 PM
03/22/13 10:47 PM
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Joined: Aug 2003
Posts: 43,124
Bend,OR USA
Cab_Burge
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which head bolts are leaking, assuming there is more than one on one side?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406398
03/23/13 09:15 AM
03/23/13 09:15 AM
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Joined: Nov 2009
Posts: 2,177
ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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What I have seen is after head milled ,block milled, is the head bolts either stock or even aftermarket tend to be to long, , then add in debris in the bolt hole and you have the makings of cracking the block thru the bolt hole.
It maybe a small crack now, But it will grow!
Temp fix,, is stud it and seal the stud,
Last edited by dennismopar73; 03/23/13 09:17 AM.
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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406399
03/23/13 10:18 AM
03/23/13 10:18 AM
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JohnRR
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Quote:
just one, bottom row second in from rear on left side, did the pressure test - ran it at 18lbs took 20 min to squeeze one drop out, watched it come out right under the head bolt. going to pull the bolt and permatex it tomorrow and re test
Do you have studs or bolts holding on your exhaust manifold/header ?
I find it hard to believe 18psi pushing water out from under the head of a fastener that is torqued to what 75ft/lb ... steel against steel ?
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Re: 440 head bolt leaking coolant
[Re: moretork03]
#1406401
03/23/13 04:12 PM
03/23/13 04:12 PM
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Joined: Jan 2003
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JohnRR
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Quote:
studs holding on headers, had block and heads tested for cracks at build 2 years ago and all checked out good so I don't think its a crack, re-used head bolts so they should be correct length. they are torqued to 70 lbs could it be coming thru gasket some how? How much torque could I put on them?
Are the studs the originals or did you replace them ? I think it's coming from a stud , gravity is a funny thing.
But if you think it's coming out of that hole pull the bolt , if it's coming up that hole it will be full of antifreeze.
Rereading this , is it under the valve cover or under the exh. manifold ?
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I wouldn't.