Coolant puddle on intake manifold [message #349838] |
Sun, 03 November 2019 16:19 |
MikeB
Messages: 133 Registered: December 2018 Location: South Bama
Karma: 1
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Senior Member |
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Yesterday I decided to take the MH into town to fill the tanks and give it my Monthly 40 minutes of driving. Before I left I looked at the motor and found a few puddles sitting down on the right side of the intake manifold. It was probably a few table spoons in each lower indent. I soaked it up with paper towel. I dint see any cracks or evidence of where it may have come from. There is one fairly new heater hose that runs on that side and connects to the rear. I checked that hose for evidence, looseness of clamps and everything on it was clean and tight. After my in town run I checked and there was no additional anti-freeze puddled. I also checked all hose connections, water pump, etc for signs of seepage and I didn't see anything. The PO installed a new aluminum heavy duty WP from applied this last summer.
I couldn't see evidence of the source of the leak but I'm wondering if this is a symptom that y'all have seen before? Could coolant be seeping out at manifold bolts?
The manifold is aluminum.
Thanks
Mike
M Beam
75’ Avion
TBI EBL , 3.70 LSD and other stuff
Zuki Sidekick,
Dozier Al
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Re: [GMCnet] Coolant puddle on intake manifold [message #349840 is a reply to message #349838] |
Sun, 03 November 2019 16:35 |
James Hupy
Messages: 6806 Registered: May 2010
Karma: -62
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Senior Member |
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Depends upon which intake manifold you have, and whether or not your deck
surfaces and heads have been milled. If, that is the case, and the angles
between the intake and heads are not correct, and you have an early model
Rockwell manifold, your intake-to-head gaskets might easily be misaligned.
That can and does lead to antifreeze coolant leaks.
Jim Hupy
Salem, Oregon
On Sun, Nov 3, 2019, 2:20 PM mtb8114--- via Gmclist
wrote:
> Yesterday I decided to take the MH into town to fill the tanks and give it
> my Monthly 40 minutes of driving. Before I left I looked at the motor and
> found a few puddles sitting down on the right side of the intake manifold.
> It was probably a few table spoons in each lower indent. I soaked it up
> with paper towel. I dint see any cracks or evidence of where it may have
> come from. There is one fairly new heater hose that runs on that side and
> connects to the rear. I checked that hose for evidence, looseness of
> clamps and everything on it was clean and tight. After my in town run I
> checked
> and there was no additional anti-freeze puddled. I also checked all hose
> connections, water pump, etc for signs of seepage and I didn't see anything.
> The PO installed a new aluminum heavy duty WP from applied this last
> summer.
>
> I couldn't see evidence of the source of the leak but I'm wondering if
> this is a symptom that y'all have seen before? Could coolant be seeping out
> at
> manifold bolts?
>
> The manifold is aluminum.
>
> Thanks
> Mike
> --
> M Beam
> 75’ Avion
> TBI EBL , 3.70 LSD and other stuff
> Zuki Sidekick,
> Dozier Al
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: Coolant puddle on intake manifold [message #349843 is a reply to message #349838] |
Sun, 03 November 2019 17:30 |
Dennis S
Messages: 3046 Registered: November 2005
Karma: 2
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Senior Member |
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Just a caution
Before you drive any more check the oil for signs of coolant. If it's leaking outside it may also be leaking internally.
Dennis
MikeB wrote on Sun, 03 November 2019 16:19Yesterday I decided to take the MH into town to fill the tanks and give it my Monthly 40 minutes of driving. Before I left I looked at the motor and found a few puddles sitting down on the right side of the intake manifold. It was probably a few table spoons in each lower indent. I soaked it up with paper towel. I dint see any cracks or evidence of where it may have come from. There is one fairly new heater hose that runs on that side and connects to the rear. I checked that hose for evidence, looseness of clamps and everything on it was clean and tight. After my in town run I checked and there was no additional anti-freeze puddled. I also checked all hose connections, water pump, etc for signs of seepage and I didn't see anything. The PO installed a new aluminum heavy duty WP from applied this last summer.
I couldn't see evidence of the source of the leak but I'm wondering if this is a symptom that y'all have seen before? Could coolant be seeping out at manifold bolts?
The manifold is aluminum.
Thanks
Mike
Dennis S
73 Painted Desert 230
Memphis TN Metro
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Re: [GMCnet] Coolant puddle on intake manifold [message #349850 is a reply to message #349843] |
Sun, 03 November 2019 22:29 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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Senior Member |
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Pressurise the cooling system with a coolant pump up to 20-25 psi and watch
for leaks.
Should be able to rent one at a parts store.
On Sun, Nov 3, 2019 at 3:31 PM Dennis Sexton via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Just a caution
> Before you drive any more check the oil for signs of coolant. If it's
> leaking outside it may also be leaking internally.
>
> Dennis
>
>
> MikeB wrote on Sun, 03 November 2019 16:19
>> Yesterday I decided to take the MH into town to fill the tanks and give
> it my Monthly 40 minutes of driving. Before I left I looked at the motor
>> and found a few puddles sitting down on the right side of the intake
> manifold. It was probably a few table spoons in each lower indent. I soaked
> it
>> up with paper towel. I dint see any cracks or evidence of where it may
> have come from. There is one fairly new heater hose that runs on that side
>> and connects to the rear. I checked that hose for evidence, looseness of
> clamps and everything on it was clean and tight. After my in town run I
>> checked and there was no additional anti-freeze puddled. I also checked
> all hose connections, water pump, etc for signs of seepage and I didn't see
>> anything. The PO installed a new aluminum heavy duty WP from applied
> this last summer.
>>
>> I couldn't see evidence of the source of the leak but I'm wondering if
> this is a symptom that y'all have seen before? Could coolant be seeping out
>> at manifold bolts?
>>
>> The manifold is aluminum.
>>
>> Thanks
>> Mike
>
>
> --
> Dennis S
> 73 Painted Desert 230
> Memphis TN Metro
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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Re: Coolant puddle on intake manifold [message #349854 is a reply to message #349838] |
Mon, 04 November 2019 01:18 |
Ken Burton
Messages: 10030 Registered: January 2004 Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Do not get carried away with all of the difficult possibilities. Instead go look for the easy and most likely things first first.
For example look at hoses and hose connections. They are on top of the manifold and it is logical that they would puddle antifreeze there.
Next would be the thermostat housing and gasket. The one that really threw me off for a while was thermostat housing bolts. They go through the housing and the manifold and into the coolant carrying area. I once had some leaking up through the threads of those bolts. The fix was simple. Remove them one at a time and put some sealant on the bolt threads. I used aviation permatex.
After looking at all of that, then you can look at more difficult things to fix.
A cooling system pressure tester can also help by pressurizing the whole system COLD and watching for leaks WITHOUT the engine running. Do not go over 10 PSI.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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Re: Coolant puddle on intake manifold [message #349859 is a reply to message #349838] |
Mon, 04 November 2019 07:19 |
jhbridges
Messages: 8412 Registered: May 2011 Location: Braselton ga
Karma: -74
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Senior Member |
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Also, do not think the tester set loaned by Advance will work. It won't. You will have to sacrifice a radiator cap and make it into an inlet for pressure. Last resort that is.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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