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#1 |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
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Help Please: Coolant Leak
My 350 has a small coolant leak (about 1 tablespoon per 20 miles). It pools in the depression around the intake maniflod bolt (Edelbrock) nearest the heater hose fitting. The heater hose/fitting does not appear to be the source as I cannot detect any coolant by running my finger around the fitting and tightening the screw clamp around the hose didn't help. It's difficult to see the source of the leak because it's small and only seems to occur when the engine is run at higher speeds. I suspect the bolt itself
![]() Thank you.
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![]() ![]() Last edited by Zonaman; 05-14-2005 at 02:32 PM. |
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#2 |
Thats the Hillbilly way
Join Date: Jul 2001
Location: Torrance,Ca
Posts: 5,980
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I always try to locate a leak like that right after a long drive and I just turn the truck off.
The pressure will build up after it sits for a couple of minute's you should be able to see it seaping. Good Luck.
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#3 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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i'd take off the thermo housing , clean it up real good using a new gasket and small amt of hitemp silicone,to the surface as well as bolt threads .
DO NOT OVERTIGHTEN THERMO HOUSING!!! 25-30 ft lbs MAX!!!
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#4 | |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
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Quote:
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![]() ![]() Last edited by Zonaman; 05-14-2005 at 04:17 PM. |
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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yes you should use a good thread sealant on the intake bolts to prevent oil and water leaks on the manifold
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#6 |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
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OK. If I want to extract that bolt, will I need to drain some coolant out of the block to keep it out of that area while sealing up those threads?
Thanks again, I apprecate the advice.
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![]() ![]() Last edited by Zonaman; 05-14-2005 at 06:47 PM. |
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#7 | |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
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Quote:
Thanks.
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![]() ![]() Last edited by Zonaman; 05-15-2005 at 07:15 PM. |
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#8 |
Senior Member
Join Date: Apr 2005
Location: metro Phoenix, AZ
Posts: 241
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Howdy:
Had this same problem on my 67 with it's transplanted 350 using a stock Qjet iron intake. One bolt hole for the thermostat housing on this piece was not "blind", going right through into the water jacket. I used Permatex brand NON-HARDENING gasket sealer on the bolt threads, and the problem was no more. used the same on the gasket as well. That stuff is hard to get off of skin, clothes, surrounding surfaces. Be neat about it, but use enough. Make sure everything is clean and DRY before you start. If you use the hardenable stuff by mistake, future disassembly will be more difficult ( but how often do you do this). The use of an iron housing is also a great idea. Just my $.02. cowboy33713 Last edited by cowboy33713; 05-15-2005 at 06:58 PM. |
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#9 |
Registered User
Join Date: Apr 2002
Location: New Carlisle, Ohio,USA
Posts: 1,404
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Do you have one of those "cool" looking chrome thermostat housings? Seals with an o-ring? That's probably where your leak is. Had one on my engine. Would leak after truck was run. Right where you say yours does. Took it off, thinking it might be cracked. Bought another, and I'll be d@mned if it didn't leak also. Dressed up intake surface, and it still leaked. Took it off, got a steel original housing. Put sealant and gasket on. Torqued it down. NO MORE LEAK! Hope this helps?
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#10 |
Registered User
Join Date: Dec 1999
Location: BRADENTON FLA
Posts: 3,269
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Drain a little coolant pull your front 2 intake bolts apply sealant and retorque your intake, pull your thermastat bolts add sealant and retorque (retorque spelling check)
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Rest in Peace Ed. Thanks for all the good times. |
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#11 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,646
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I have heard that FelPro has a "leakproof" thermostat gasket that seems to be effective. Need to see about getting one myself. HTH
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#12 |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
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OhioDan, I'm using a stock thermostat housing- the type that fits a '75 C10.
As far as sealants for the bolts I've got a bunch of Permatex products: the blue threadlock, the water pump & thermostat hosuing rtv orange high temp rtv, & ultra grey rtv. I usually reach for the waterpump & thermostat tube- but have never used it on the bolts.
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![]() ![]() Last edited by Zonaman; 05-15-2005 at 07:23 PM. |
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#13 |
Senior Member
![]() Join Date: May 2004
Location: Queen Creek, AZ
Posts: 1,005
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If you have one of the chrome housings, can't you use a gasket on them instead of the o-ring??
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