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426 Hemi Oil Leak at Drain Back Hole - Need Ideas
#2044698
04/02/16 08:55 PM
04/02/16 08:55 PM
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Joined: Jan 2003
Posts: 5,137 East Aurora (Buffalo) NY
RoadRunner
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,137
East Aurora (Buffalo) NY
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So I looked at some past threads and it sounds like this is a common problem. Mine is driving me crazy as I am about to go with my third set of head gaskets. I have a newer reproduction hemi block and an original set of 64 Race Hemi heads. Both block and heads have been machined two years ago. The first head gasket I used was the MP steel shim gasket. I used copper spray and Permatex 2A around the oil drain holes and water passages. ARP studs torqued to 80 lb ft torque per instructions. Leaked right away on front driver side and a small amount on passenger side rear. The leak at the front was pretty bad, but I kept engine running to break in the cam. Pulled it apart and swapped to a multi-layer fel-pro. Used Hylomar Blue around oil and coolant holes. We use Hylomar on our turbomachinary at work and it seems to work well even under pressurized oil passages. Still leaks, but not real bad.
So now, I have a pair of Cometic gaskets and another tube of Hylomar. But I have read that sealant is not necessary. Or should I get Permatex Ultra Copper Silicone or Right Stuff as I have read recommended in other posts.
I have also checked to make sure the dowel pin isn't holding the head off. I looked into the passages with a flashlight and the one that leaks appears to have a slight offeset between the head and block. Not quite 1/16" (drain back holes are 7/16" diameter), but the others are also off slightly, so not sure if that is a cause. I doubt it since I made sure to spread the sealant out over 1/4" away from hole.
Any other suggestions? I WANT to drive the car this year for change. Its been two years. If this doesn't work, I will be very disappointed as I have always wanted a cross ram Hemi.
Thanks in advance.
68 Road Runner (383/4speed, post car w/decor pkg) - Major Project 69 Road Runner w/472 Hemi & 4 speed. 70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project 2023 Ford Mach 1
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Re: 426 Hemi Oil Leak at Drain Back Hole - Need Ideas
[Re: racerhog]
#2044903
04/02/16 11:58 PM
04/02/16 11:58 PM
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Joined: Jan 2003
Posts: 5,137 East Aurora (Buffalo) NY
RoadRunner
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,137
East Aurora (Buffalo) NY
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I'm thinking about the arruzza head gaskets. I know the valve covers are different. I had to make my own gaskets there. I have the right valve covers. The leaks are definitely where the head and block meet at the corners.
68 Road Runner (383/4speed, post car w/decor pkg) - Major Project 69 Road Runner w/472 Hemi & 4 speed. 70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project 2023 Ford Mach 1
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Re: 426 Hemi Oil Leak at Drain Back Hole - Need Ideas
[Re: RoadRunner]
#2045823
04/03/16 11:55 PM
04/03/16 11:55 PM
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Joined: Jan 2003
Posts: 5,137 East Aurora (Buffalo) NY
RoadRunner
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,137
East Aurora (Buffalo) NY
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I am not sure the Arruza gaskets will handle this. Nor the Cometics. It appears that the return home in the block is drilled incorrectly. You can see where the embossing on gasket barely surrounded the hole. It look like there embossing actually squished into the hole allowing oil seep around. Its about 1/16" to 1/8" off. I did add sealant but must not have been enough. I am not sure what options I have now. Anything requiring drilling will leave possibility of chips in the pan. External return in that corner? Another gasket with even more sealant? Looking for additional ideas. I am not happy with this adventure.
68 Road Runner (383/4speed, post car w/decor pkg) - Major Project 69 Road Runner w/472 Hemi & 4 speed. 70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project 2023 Ford Mach 1
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Re: 426 Hemi Oil Leak at Drain Back Hole - Need Ideas
[Re: RoadRunner]
#2045981
04/04/16 02:40 AM
04/04/16 02:40 AM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
master
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master
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
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Orings? I am not sure the Arruza gaskets will handle this. Nor the Cometics. It appears that the return home in the block is drilled incorrectly. You can see where the embossing on gasket barely surrounded the hole. It look like there embossing actually squished into the hole allowing oil seep around. Its about 1/16" to 1/8" off. I did add sealant but must not have been enough. I am not sure what options I have now. Anything requiring drilling will leave possibility of chips in the pan. External return in that corner? Another gasket with even more sealant? Looking for additional ideas. I am not happy with this adventure.
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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