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Old 06-02-2013, 12:22 AM
john jones john jones is offline
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Help and ideas with pinhole leak in 351 block

Without going into a long story.. Last year I bought this 93 Maristar with 351 indmar 250 hours. When we were test driving it I noticed that there was oil dripping down the bell housing on the transmission. I told the buyer that it was probably a rear main seal. Seemed reasonable he hadn't used it for 2 years after his wife died. We negotiated the price and I bought it.

Fast forward to this week, I decided to replace the seal. I got it all done we took it out for the test drive today. We were motoring around I am looking to make sure everything looks good. As I was patting myself on the back and high fiving my wife, I took another look and noticed oil on the bell housing. Damn I was so careful what happened?? As I am looking again she is on the gas and around 2000 rpm and I notice oil coming out of this pinhole (I am not kidding, it is a pinhole) traveling along the top of the oil pan gasket and dripping down the bell housing.

So, I am looking for repair options. Has anyone tried this? If so, what did you use to repair? I have read about guys drilling above and below the crack and filling with epoxy, marine tek, JB etc.. To be honest it is so small drilling looks like it would cause more of a hole than what I have currently.

I have attached a pic. It is the best i can do with my cell phone camera.
the arrow shows the pinhole and the oval shows the oil running down the block. This only happens when it is at high rpms 2000 and above.

Thanks for the help..
Name:  St. Paul-20130601-00263.jpg
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Last edited by john jones; 06-02-2013 at 12:33 AM.
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Old 06-02-2013, 01:38 AM
Cloaked Cloaked is offline
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Quote:
Originally Posted by john jones View Post
..........I have read about guys drilling above and below the crack and filling with epoxy, marine tek, JB etc..
Merely a temporary fix at best. For a tiny pinhole, a spot weld may do, but find someone that knows process and metalurgy...

JB crap should be outlawed.......

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Old 06-02-2013, 09:58 AM
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Sand down around the pin hole, zip with welder and then repaint... should be good to go and hold better than jb weld
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Old 06-02-2013, 10:45 AM
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Old 06-02-2013, 11:22 AM
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Yes you could weld it, but is there a larger void behind it.

As a boilermaker and somebody who has done plenty of NDT, I would recommend that you consider braizing the pin hole, second choice weld, but to temper this I would say both would be fine.
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Old 06-02-2013, 11:57 AM
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I say skip the JB and just stick some old bubble gum over it.
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Old 06-03-2013, 12:26 AM
john jones john jones is offline
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Thanks for the ideas. I will try and find a good marine welder who feels certain that he can fix this. Glad to know that there are some options.

Anyone have any ideas how this could happen? I understand if the water isn"t drained the block can crack when frozen, but this is oil coming out of this pinhole.. Any ideas?
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Old 06-03-2013, 09:30 AM
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Sounds like a void from the casting process, rare, but can happen.
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Old 06-03-2013, 09:57 AM
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Is there anything clogging the crank case ventilation??
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Old 06-03-2013, 05:39 PM
john jones john jones is offline
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Quote:
Originally Posted by CantRepeat View Post
Is there anything clogging the crank case ventilation??
Not sure? I took the pcv valve out of the rocker arm cover, looked it over. It appeared fine. Is there another way that I can check?
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