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> Rebuiding Inside-out
BillJ
post Jul 6 2023, 01:04 PM
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When i had the 4cyl race engine done on the scca car (Gumby) the builder used aluminum not steel. The cooling differential is too high.


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bkrantz
post Jul 6 2023, 07:25 PM
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QUOTE(DRPHIL914 @ Jul 6 2023, 07:17 AM) *

@bkrantz

man that sucks! wow, i agree that maybe different plug will fix this?
- the rest of it is soo clean! i wrapped my cables just like yours, i am also fighting a leak on my new 2.1 motor and i think its seeping from the head-cylinder interface!! verified my new oil cooler seals and pump seal and galley plugs are dry this time along with the new RMS no leaks but man i know how frustrating it is.

I have a question, what are you using for modern EFI
I control, is it the Holley system?

Phil


Thanks.

I installed a MegaSquirt 2 with an integrated system put together by Mario at the Dub Shop. He supplied an initial tune file that started the first time, and then was modified by tuning on a dyno.

If I can ever get the oil leaks fixed, I will get back to tuning.
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bkrantz
post Jul 6 2023, 07:26 PM
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[quote name='Ottomotion' date='Jul 6 2023, 08:53 AM' post='3087704']
Not a crack (I hope!) but a surface scratch and/or a casting mark.
[/quote]

The more I look at the pics (not just this one) the more it looks like a crack repair......that has failed. Probably over torqued at some point in engine's past? otherwise strange spot for a crack.
[/quote]

Possible but I still think/hope not. See the photos below.
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bkrantz
post Jul 6 2023, 07:27 PM
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I removed the cross bar and left motor mount again. Here's the plug, which looks much like last time with oil showing around the lower half of the plug-case joint.


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bkrantz
post Jul 6 2023, 07:29 PM
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Under UV light before any cleaning. Most of the joint surrounding the plug looks oily.


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bkrantz
post Jul 6 2023, 07:31 PM
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As I unscrewed the plug, the sealant was uncured and very fluid. Again.


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bkrantz
post Jul 6 2023, 07:34 PM
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To check for a crack I used a mirror to get a look at the inside after cleaning it with solvent on a rag. I figure just like a normal crack test, any oil would act like a dye and light up the crack. I did not see anything like that.


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bkrantz
post Jul 6 2023, 07:35 PM
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Just like last time, with different sealant, the plug threads look oily and without cured sealant--and potentially leaky.


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bkrantz
post Jul 6 2023, 07:50 PM
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QUOTE(BillJ @ Jul 6 2023, 01:04 PM) *

When i had the 4cyl race engine done on the scca car (Gumby) the builder used aluminum not steel. The cooling differential is too high.


I have thought about this. As best I can tell the plug is M22 x 1.5, and the stock plug is steel. You are right: depending on the type of steel and and the aluminum alloy in the case, the thermal expansion will be 2 to 3 times higher in the case.

I cannot find an aluminum plug but did find a brass plug to order. Brass is much closer the the thermal expansion of aluminum.

Once I get this, I will use a "permanent" type sealer, like Form-a-gasket #1. If that does not work, I might go nuclear and use JB Weld.
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r_towle
post Jul 6 2023, 08:02 PM
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Good luck, that is certainly a pesky annoying issue.
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Ottomotion
post Jul 6 2023, 09:05 PM
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[/quote]I might go nuclear and use JB Weld.
[/quote]

If it is cracked, every time you go to tighten it, it will want to open up and the goo solutions will be compromised. I think JB Weld might be the exception....
Fingers crossed!

BTW this is an outstanding thread regardless of the outcome. You are to be commended for your efforts and contributions to the 914 community. (IMG:style_emoticons/default/beerchug.gif)
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Cairo94507
post Jul 7 2023, 06:44 AM
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Indeed. (IMG:style_emoticons/default/beerchug.gif)
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Shivers
post Jul 7 2023, 06:53 AM
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@bkrantz

https://www.racetronix.biz/p/metric-hex-plu...ASABEgL_o_D_BwE
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930cabman
post Jul 7 2023, 09:58 AM
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[quote name='Ottomotion' date='Jul 6 2023, 09:05 PM' post='3087857']
[/quote]I might go nuclear and use JB Weld.
[/quote]

If it is cracked, every time you go to tighten it, it will want to open up and the goo solutions will be compromised. I think JB Weld might be the exception....
Fingers crossed!

BTW this is an outstanding thread regardless of the outcome. You are to be commended for your efforts and contributions to the 914 community. (IMG:style_emoticons/default/beerchug.gif)
[/quote]

I would consider JB or another 2 part epoxy with minimal torque.

Or an aluminum tapered plug
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bkrantz
post Jul 7 2023, 07:18 PM
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QUOTE(Shivers @ Jul 7 2023, 06:53 AM) *

@bkrantz

https://www.racetronix.biz/p/metric-hex-plu...ASABEgL_o_D_BwE


Thanks for the lead. This might work but the space behind the motor mount is limited.
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bkrantz
post Jul 10 2023, 07:23 PM
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Her we go again. One thing I found that might have contributed to my problems getting a good seal: even through I tried to clean all the oil out of the galley, after sitting for a few day enough drained down to flow out.


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bkrantz
post Jul 10 2023, 07:28 PM
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Using a mirror to see how much oil pooled in the bottom of the galley, I can imagine how it contaminated the thread sealants I tried after previous adventures with the plug, from the inside.

This time I cleaned it out again, and waited long enough (I hope) to make sure no more oil draining down.


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bkrantz
post Jul 10 2023, 07:31 PM
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Fedex brought this today. Same basic diameter and thread pitch as the stock plug, but brass. This should have thermal expansion closer to the aluminum case. Obvisouly, the brass plug is taller.


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bkrantz
post Jul 10 2023, 07:32 PM
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Good news: it does thread into the hole.


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bkrantz
post Jul 10 2023, 07:35 PM
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Bad news: with a moderate amount of torque, this is as far as it screws in.


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