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Will work for parts
Join Date: Oct 2002
Location: Silicon Valley
Posts: 893
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Well there's your problem! (no compression)
So my cheap '74 is starting to prove it's "un-cheapness". After not running for 8+ years I got the motor to fire and run; albeit poorly. There was a loud 'pft' sound that after finding loose head stud nuts I figured was a sure sign of pulled studs and loose cylinders. Well after fighting with all sorts of fun I got both heads off. Number 2 was the main culprit and had 0 compression. Well low and behold it was the one with a completely pulled head stud. Number 1 was missing about 2" of the sealing ring and had some wear, however #2 was missing half the sealing ring and had about a .75" chunk of material missing. Not generally good for compression.
 Now I need to replace that one cylinder for sure. But can I just replace the one? Or is my only option the full set of six for 3K? Being my first 911 motor rebuild I am not quite sure if you can source the correct tolerance group parts and use them or if everything has to be a matched set from the factory. They might even be repairable by a machinist too, but this is why I am coming to the best pool of knowledge around! I am looking to weigh my options because this is going to end up as a 12K rebuild then i might look for another motor or it will have to sit while I accumulate the funds. -Greg
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'88 944 240,100 miles -race car '05 Boxster 110,000 - Daily Driver '74 911 Targa - long term project |
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07-21-2013, 08:44 PM
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RETIRED
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Take the heads and cylinders into a competent machine shop.
Start from there. The bottom end maybe saveable. Pulled studs can be fixed with inserts. Take your time. Add up the costs. You may be better off buying a running motor.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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07-21-2013, 08:49 PM
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ROW '78 911 Targa
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Look for threads on the cost of splitting your case and having it properly repaired with time certs vs replacing it with a good 3.0 or larger engine. I think you'll find your answer.
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07-21-2013, 08:51 PM
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Will work for parts
Join Date: Oct 2002
Location: Silicon Valley
Posts: 893
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OK, I was going down this road in order to get case-savers installed. So I will start making some calls to see what can be done for welding/machining to save the parts. I will also look at used motors.
I like the idea of sticking with a 2.7 but I realize that cost wise it might not be the most economical.
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'88 944 240,100 miles -race car '05 Boxster 110,000 - Daily Driver '74 911 Targa - long term project |
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07-21-2013, 08:58 PM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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Sorry for your dilemma.
For grins and wiggles, could you stick a magnet to the cylinder bore to see if it is Nikasil? Along with posting the last four numbers in your VIN? Thanks.
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Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. |
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07-22-2013, 06:24 AM
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Registered
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i have a 2.7 for sale
1976 2.7L CIS motor for sale 6560537 7r case
i bought this about a year ago from another pelican. see my post..send me a pm if interested..
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1975 911S Targa Silver Anniversary Edition |
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07-22-2013, 06:46 AM
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Da cab
Heinz
