cooling system wont hold psi ???
#1789480
03/27/15 05:50 PM
03/27/15 05:50 PM
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RapidRobert
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rebuilt/unfired SB. intergrity of the cooling system. how much loss of psi is acceptable (if any). I'm thinking if it is pumped up to 15 lbs it should stay there (or very very close). Your thoughts please
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Re: cooling system wont hold psi ???
[Re: dvw]
#1789484
03/27/15 10:18 PM
03/27/15 10:18 PM
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RapidRobert
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Yes my Stant pump up kit is a bit leaky but on this I drilled/tapped the stat housing extension for a brass schrader valve & pumped it up directly with an air hose/chuck from the compressor. What I am really after is to find out if it is the head gasket(s) or the intake gasket(s) so if it is the intake gaskets (whichever side) then I dont have to pull the heads
live every 24 hour block of time like it's your last day on earth
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Re: cooling system wont hold psi ???
[Re: NITROUSN]
#1789486
03/27/15 11:54 PM
03/27/15 11:54 PM
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RapidRobert
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No coolant cuz I know I have a problem. I've used dish soap/water on the outside to check for bubbles but the inside is where I am focused now. What is "tire check", cuz if that is something that will show up on the outside like smoke or a dye & not need to be cleaned out then that sounds like exactly what I need
live every 24 hour block of time like it's your last day on earth
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Re: cooling system wont hold psi ???
[Re: NITROUSN]
#1789488
03/28/15 12:07 AM
03/28/15 12:07 AM
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RapidRobert
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Yeah I would not want to introduce water into there. To ans your Q accessing the block dist hole would let me checkout the (2) rearmost cooling passages between head/intake. A shop here has a smoke machine that pumps it in to 5 psi he said & it'd be 1/2 hr shop time ($40). I might just bite the bullet & replace both head/intake gaskets & if that dont do it then the tcover gasket.
live every 24 hour block of time like it's your last day on earth
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Re: cooling system wont hold psi ???
[Re: RapidRobert]
#1789489
03/28/15 12:25 AM
03/28/15 12:25 AM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
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Quote:
Yes my Stant pump up kit is a bit leaky but on this I drilled/tapped the stat housing extension for a brass schrader valve & pumped it up directly with an air hose/chuck from the compressor. What I am really after is to find out if it is the head gasket(s) or the intake gasket(s) so if it is the intake gaskets (whichever side) then I dont have to pull the heads
How much PSI did you pump into this motor Rob?....it's easy to blow out the water pump gasket on a small block with just 20 psi
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Re: cooling system wont hold psi ???
[Re: QuickBpBp]
#1789492
03/28/15 08:39 PM
03/28/15 08:39 PM
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Joined: Oct 2003
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70Cuda383
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It should hold pressure a long time. I tested a big block that was losing coolant. Tested cold, it held pressure for 12 hours overnight. 16 psi and didn't bleed off a single pound. When hot though, it leaked coolant into the chamber and sent it out the pipe as steam.
If you can't maintain ANY pressure, definitely need to dig deeper
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Re: cooling system wont hold psi ???
[Re: minivan]
#1789495
03/30/15 10:55 PM
03/30/15 10:55 PM
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RapidRobert
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Yes my intake gaskets & one head gasket (I already have a spare new one) will be in tomorrow (Tues) morning .
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Re: cooling system wont hold psi ???
[Re: minivan]
#1789496
03/30/15 11:43 PM
03/30/15 11:43 PM
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