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#1 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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water leak
i have a 69 chevy truck and i keep getting a leak at a couple of head bolts on my engine. the bolts on outside of head cover near the back of the heads. when i built the engine i used arp thread sealant .and after a couple hundred miles it started to leak so i pulled all the bolts and resealed all the threads with a different sealant and again after a couple hundred miles the same bolts started to leak again. i am not getting any water in the engine and i am not having overheating and i am only loosing about a quart of water every couple of days. i dont really want to put those sealants in the radiator because they make a mess inside the motor and i am afraid they clog up some of the water jackets in the block and heads but i dont know what else to try. any ideas?
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#2 |
Project Junkie! Fishing Poor!!
![]() Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,770
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Re: water leak
Did you run a tap in the holes to clean them out befor installing the head bolts. If not you should. Head bolts tend to leak if not. WES
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#3 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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Re: water leak
i guess i could try that again.
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#4 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: water leak
Is this on one head or both?
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#5 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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Re: water leak
so far this time it is only in one but last time it was in both.
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#6 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: water leak
I would pull the valve covers and re-torque all the head bolts in sequence. Try cleaning the threads and blowing them out with air, might have some debris in the bottom hole causing the bolts to bottom out too soon. If this doesn't solve the issue, you may have a problem with the head gasket, warped head possibly, or uneven surface on the deck of the block. Many of factors, but if it leaked before and you tried to torquing it back down damage may have been done to the head gasket.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#7 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: water leak
What is a "head cover"? Do you mean "valve cover" or "rocker arm cover"?
So you're sayin' it's the bolts along the bottom of the actual head that are located in a line under the manifolds/headers? Or are they the intake manifold bolts on the top that screw into the heads through the intake? Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#8 |
Registered User
Join Date: Sep 2011
Location: Greencastle, IN
Posts: 132
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Re: water leak
Ditto. Same question. What's a head cover bolt?
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#9 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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Re: water leak
one bolt on each side the bolts outside the valve cover . the skirt bolts.
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#10 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: water leak
Good question, cause I am assuming he was talking about the ones located at the skirt of the head.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#11 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: water leak
Take a picture and show us.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#12 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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Re: water leak
well it turns that my leak is exactly what i hoped it would not be . a crack in the block. now to figure out what to do about it. i cant buy a new one and this one was rebuilt about a year ago so i need to try to save it. any ideas i have a few but would like to here yours.
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#13 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: water leak
Some people use the technique called Pinning the Crack. But if it is at the head bolt, you are better off finding another block.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#14 |
Registered User
![]() Join Date: Oct 2011
Location: jackson michigan
Posts: 755
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Re: water leak
Drill small hole at the end of the crack . Weld the crack shut and grind it smooth. Put it back together and run block sealer thru the block only. Remove the heater core from the loop. Its a last chance try. If it does not work you are not out anything.
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#15 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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Re: water leak
thanks for advise
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#16 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: water leak
Best thing to do is pull the engine, break it down, and take it to your local machine shop and ask there opinion if it is repairable. That's your best bet.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#17 |
Registered User
Join Date: Sep 2011
Location: Greencastle, IN
Posts: 132
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Re: water leak
Are you trying to save the integrity of the truck keeping the original motor? These trucks did not link the block stamp to the vin so as long as you have the same size block, you still have essentially the stock truck. These motors are too prevelant and cheap in junk yards to put all the effort into saving a cracked block in my opinion. Not trying to nay say anyone's thoughts here but if i had a cracked block, I'd just get whole motor from a junk yard and rebuild it.
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#18 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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Re: water leak
well 1 i have spent quite alot on this motor and 2 i dont know about where you are from but around here a 350 four bolt main engine is not that easy to come by i have already looked for one. i am first going to try a special rod from muggy weld that is supposed to be good for just this kind of thing. if it doesnt work im only out about 50.00 dollars worth of welding rod then i will look again but it will take a while because my budget is very small. it took me eight years to get my truck to where it is and im not done yet
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#19 |
Registered User
Join Date: Sep 2011
Location: Greencastle, IN
Posts: 132
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Re: water leak
Yeah, I understand four bolts being hard to find in that year. They're out there of course but it sure seems to take a long time to find one. We do have a ton of them up here in Indiana and some are even cheap like a couple hundred or so. If the fix doesn't work and you don't find one in AL, come visit me and we'll search over a weekend and some beverages. ha ha ha
Seriously though, if you find you have a need, let me know and I'll try to find something. |
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#20 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
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Re: water leak
thanks
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