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corrosion on engine 1961 f 85

Old January 22nd, 2019, 08:49 AM
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corrosion on engine 1961 f 85

Hi
well , I will need your opinion on my problem . on each cooling port of my engine , there is corrosion near two bolt holes and those two holes have theirs threads out of order and i am afraid to don't have enough material to place an insert or helicoil.



i would like to know what can my options be ?
I was thinking about aluminum welding or epoxy "welding" ( JB weld style ) ?
if i weld on the engine case , it is in full aluminum or there is magnesium mixed with ?
thanks
Guillaume
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Old January 22nd, 2019, 09:09 AM
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Joe Pavadano would be the best guy to answer your concerns. Try to PM him. I wouldn't use JB Weld.
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Old January 22nd, 2019, 10:53 AM
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The block is just aluminum and can be welded on. I would think a Heli-Coil will fix the threads.
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Old January 22nd, 2019, 11:35 AM
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Have you run a thread chaser tap into these holes to see how much thread is left?
I would heli-coil them if you have less then 60% thread left and change the bolts using a longer thread without bottoming.
I rebuilt a 61 .and had the same problem and cleaning the timing chain housing bolts worked, the head bolts I had to drill out larger and make my own inserts using 5/8 11 UNC and taping them for the 7/16 head bolts.
Steve
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Old January 22nd, 2019, 11:19 PM
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thanks at all for your time to help me
Well ,some holes don't have thread and with corrosion , i am afraid to don't have enough aluminm material to place a helicoil maybe a Time Sert .
In reading your he Oldskeeper's comment , do you think if i tap the out of order 5/16 hole to screw a 3/8 head bolt , is it possible to take this way ?
After , i saw that too but i don't know if this is a good idea ?
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Old January 24th, 2019, 06:41 AM
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This video is interesting to watch. Can you give us a name of this product in english for those of us that don't read or understand French?
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Old January 24th, 2019, 07:54 AM
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Sure , the name of this soldering kit is ALIA 282 with 5 alloy rods and a stainless brush but i didn't find something in english yet .there are very good feedback about this kit just important to prepare very good the surface to work on . the alloy rod melt at 480C

I think this kit is similar to the one i took the video
https://www.durafix.com/
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Old January 24th, 2019, 08:55 AM
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This product will do what you need to do. Getting the engine perfectly clean will be the hard part.
Removing the corrosion so it doesn't contaminate the weld might require drilling the hole larger
and then filling and then drilling and tapping new threads. The timing chain cover will work as
a drill guide to center the hole after you have completed the filling.
I would check with Fastenal or another supplier for thread inserts before welding it up,
Heli-coils work good in stripped holes but with corrosion I prefer a larger dia. thread body.
I have tried this product and it works great on new material, I couldn't make it work on older repairs
where the aluminium had been weathered.
I had 3 stripped spark plug holes in the heads and I tried the "sav-a-thread" repair insert and they
worked their way loose and I ended up using the Triton V 10 spark plug insert and they worked great.
This also required changing the plugs for a different type.
Steve
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Old January 25th, 2019, 06:33 AM
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A few comments. First, a Heli-coil requires the smallest oversize hole to be drilled. Timeserts, Keen-Serts, and the other solid-body thread repair inserts require a larger hole and thread to be cut, thus making any thinned section problem that much worse. Second, if you look closely, there is a boss behind the corroded area that provides additional material for the threads. Personally I'd put in a Heli-coil and not loose a lot of sleep over this.
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Old February 11th, 2019, 06:02 AM
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It’s going to be very hard to Tig weld that because the corrosion has thoroughly permeated the aluminum. A helicoil would be about your only option. Especially that one hole with the thin wall around it.
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Old February 13th, 2019, 07:13 AM
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hi and thanks for all for your time to help .
well i have installed helicoils , now just a question , must i use rtv all around cooling port or just the gasket if enough ?
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Old February 13th, 2019, 07:55 AM
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Originally Posted by Guillaume View Post
hi and thanks for all for your time to help .
well i have installed helicoils , now just a question , must i use rtv all around cooling port or just the gasket if enough ?
If there is any pitting on the gasket surface, I'd use RTV. If the gasket surface is smooth, then gasket alone is fine.
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