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> I am looking for more opinions on this 2.7 case., Cut off wheel did it's damage.
wndsnd
post Apr 27 2014, 07:38 AM
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Gentle Teeners,

I bought a 2.7 running engine that was in a 911, recently pulled, and brought to Hershey for me. As an old used engine, I was expecting to tear it down and inspect everything so I could evaluate it's usefulness as a rebuild engine to base a conversion around.

I got it on the stand and started cleaning and found this 1" cut underneath the cooler mount area. It set me aback.....


There is a cut in the case that looks to be made by a cut off disk. Someone got overly aggressive with an exhaust piece or something and ground into the case.



Attached Image

It looks to be about 3/16" deep. I have not measured it yet. It does not enter the case, it is not through the case. For all I know the case could be 1" thick here or it could be nearly through.

My question is, does this ruin the case? It is not near the head stud area, and I have been told it is in a low pressure oil bypass area. I am not sure how thick the case would be there? Could it cause a stress point that would fail in a freshly built engine and start a crack? This is a magnesium case so I would need to know if it could be welded with success as well.

I showed it to the guys at Rich Towles this weekend and we have an opinion, but I would like other engine builders out there to comment before I invest heavily in a conversion around this engine.

Hopefully Jake and others that build engines regularly will see this and give me their opinion.

Thanks
John
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r_towle
post Apr 27 2014, 07:40 AM
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It may be in your best interest to clean that case much better, and then take some better pics.....
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JStroud
post Apr 27 2014, 07:46 AM
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I agree, of course I'm on my phone, but I couldn't tell for sure where it is.
What I think is it, isn't clear enough to evaluate.
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wndsnd
post Apr 27 2014, 07:46 AM
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Yes Sir, I am at it .......
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wndsnd
post Apr 27 2014, 08:13 AM
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I am cleaning but here is another dirty girl picture:

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Look under pressure relief valve
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wndsnd
post Apr 27 2014, 08:27 AM
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wndsnd
post Apr 27 2014, 08:43 AM
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Last one for now. It looks worse in my shop light than the picture indicates.

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Woody
post Apr 27 2014, 10:29 AM
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I don't really have any way to measure wall thickness at home but this is what you are looking at from the other side. I could bring home a micrometer tomorrow and take a better measurement.

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Woody
post Apr 27 2014, 10:30 AM
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Woody
post Apr 27 2014, 10:32 AM
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r_towle
post Apr 27 2014, 10:55 AM
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These guys.

http://services.ramsaywelding.com/item/all...-1004?forward=1
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Woody
post Apr 27 2014, 11:14 AM
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Yeah but they'll want a bare case most likely.
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rdomeck
post Apr 27 2014, 12:49 PM
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Before I starting my fabrication/welding business I was a Porsche mechanic for about 3 years. The shop we worked at did all major work on air cooled Porsche's.... Between the two of us we probably built over a hundred engines in that 3 year time period. I would have no problem leaving that case as is and rebuilding it. The case in that area is much thicker than the cut is deep.

Continue on with your rebuild and don't worry about it!
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iamchappy
post Apr 27 2014, 02:13 PM
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I would put a little JB weld on it for appearance sake and forget about it.
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Woody
post Apr 27 2014, 02:16 PM
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If I can remember tomorrow, I'll bring home one of my extended reach calipers and try to take a measurement for you on the wall thickness of that galley.
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wndsnd
post Apr 27 2014, 02:35 PM
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Thanks guys,

I have been cleaning and dissassembling all day. This engine looks good to me. There are no signs of stud pull, it was the mild 2.7 and it did not start in CA so it never had the cats.

I am hoping the consensus is to forget about it.

It looks to be original and the case has not been split. The cam chain covers have been opened though, as there is some silicone gooping out, but the case looks intact and the heads and cylinders look like they have never been touched as well.

We will see where this goes

John
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wndsnd
post Apr 27 2014, 04:04 PM
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You wanted a horse, but got a goat. Nobody wants a goat....
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Right side Cam chain tensioner is all the way backed off and loose. The chain has lots of slack.

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Suprised it did not slip the sprocket.
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wndsnd
post Apr 27 2014, 04:05 PM
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Compare to the left side.

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Woody
post Apr 27 2014, 04:15 PM
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Oooh that's ugly.
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wndsnd
post Apr 27 2014, 04:31 PM
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You wanted a horse, but got a goat. Nobody wants a goat....
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I have some pre buy leak down numbers.

1 8%
6 15%
2 20%
4 8%
3 14%
5 10%

I will work on the tensioners and re-do the leak down and see what I get.

Thanks Woody.

John
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