964 Engine Teardown...
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Racer
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From: Carmichael, CA
964 Engine Teardown...
Here's some pix and a short video of the engine:
http://vintagebus.com/teardown/
3 rocker shafts had backed out significantly. One
of the cam seals was installed incorrectly, and the
seals on the rocker shafts appear to have not been
installed - there's just an empty groove. In addition,
there were some pretty hefty leaks, like on the 1-3
bank on the bottom and on top of #4 and #1. There's also
a connector (I think for the cam oil line) that was leaking
badly on the right side, but was fine on the left side.
The heads will be coming off today, details to follow...
I should point out that this engine has about 3500 miles since it was rebuilt...
http://vintagebus.com/teardown/
3 rocker shafts had backed out significantly. One
of the cam seals was installed incorrectly, and the
seals on the rocker shafts appear to have not been
installed - there's just an empty groove. In addition,
there were some pretty hefty leaks, like on the 1-3
bank on the bottom and on top of #4 and #1. There's also
a connector (I think for the cam oil line) that was leaking
badly on the right side, but was fine on the left side.
The heads will be coming off today, details to follow...
I should point out that this engine has about 3500 miles since it was rebuilt...
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From: Gulf of America-Pacific NW
Thom;
As a fellow enthusiast, it makes you sick when you see this kind of work. I would definately have a conversation with the company that rebuilt your engine. Pictures speak a thousand words. Are you going to pull all the pistons off? I would inspect the rods and rod bearings. It might be a good idea to install raceware or ARP rodbolts. Good luck
As a fellow enthusiast, it makes you sick when you see this kind of work. I would definately have a conversation with the company that rebuilt your engine. Pictures speak a thousand words. Are you going to pull all the pistons off? I would inspect the rods and rod bearings. It might be a good idea to install raceware or ARP rodbolts. Good luck
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From: Central US of A
Thom writes:
"and the seals on the rocker shafts appear to have not been installed"
Thom,
Ya know... Those seals are not factory installed in the 911 rocker groove (I don't think the 964 got 'em factory either). The groove IS empty from the factory on a 911. However, I like the rocker shaft seals, and think you should use them nevertheless.
I do think the engine could have been put together hastily, but the shaft seals are just optional (to stop rocker shaft leaks).
"and the seals on the rocker shafts appear to have not been installed"
Thom,
Ya know... Those seals are not factory installed in the 911 rocker groove (I don't think the 964 got 'em factory either). The groove IS empty from the factory on a 911. However, I like the rocker shaft seals, and think you should use them nevertheless.
I do think the engine could have been put together hastily, but the shaft seals are just optional (to stop rocker shaft leaks).
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Racer
Joined: Jun 2001
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From: Carmichael, CA
As I now know, but they'll be put on when it goes back together...
Originally posted by Michael B.:
<STRONG>Ya know... Those seals are not factory installed in the 911 rocker groove </STRONG>
<STRONG>Ya know... Those seals are not factory installed in the 911 rocker groove </STRONG>
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Racer
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From: Carmichael, CA
Well, the heads, cylinders and pistons are off, and it's getting uglier by the minute. There was severe leakage on #2 & #4, the ones with the broken studs. One broken ring, #5 I believe. I've decided to have the shop split the case and inspect the bottom end as well.
http://vintagebus.com/teardown/leakage-1.jpg http://vintagebus.com/teardown/leakage-2.jpg
Wish I had an extra $5k laying around; I'd go with 3.8 P&C's and upgrade the cams...
http://vintagebus.com/teardown/leakage-1.jpg http://vintagebus.com/teardown/leakage-2.jpg
Wish I had an extra $5k laying around; I'd go with 3.8 P&C's and upgrade the cams...
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From: Arizona
Thom,
Was this motor sold under the guise of a full rebuild? how much did you drop on it?, Regardless of the sloppy assembly it does not look like a 3500 mile motor (IMHO). I looks like a freshened (Honed and ringed maybe). The amount of carbon buildup on the heads & valves, the discoloration on the underside of the pistons and jugs, and the bright wear on the piston skirt usually takes a lot longer to build up than 3500 miles, the thing should look nearly new! I'd get the opinion from your new mechanic and go back to DP with some questions!
On the rebuld I would definately run the shaft seals, but they are no good unless the rocker shafts are accurately placed and torqued properly. If they were old bolts and over torqued they may have stretched and will not hold the proper torque and loosen again. What year motor was this? is it an early leak prone motor without the head gasket or CE ring?
This kind of thing burns me up
Was this motor sold under the guise of a full rebuild? how much did you drop on it?, Regardless of the sloppy assembly it does not look like a 3500 mile motor (IMHO). I looks like a freshened (Honed and ringed maybe). The amount of carbon buildup on the heads & valves, the discoloration on the underside of the pistons and jugs, and the bright wear on the piston skirt usually takes a lot longer to build up than 3500 miles, the thing should look nearly new! I'd get the opinion from your new mechanic and go back to DP with some questions!
On the rebuld I would definately run the shaft seals, but they are no good unless the rocker shafts are accurately placed and torqued properly. If they were old bolts and over torqued they may have stretched and will not hold the proper torque and loosen again. What year motor was this? is it an early leak prone motor without the head gasket or CE ring?
This kind of thing burns me up
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From: Putnam Valley, NY
As I look at the photos and the short mpeg narrative, I am at a loss to understand all the many things that went wrong with this engine.
Poorly installed seals and gaskets appear to be part of the problem, but that's just the beginning. Thom - did your mechanic tell you why the rocker shafts backed out, why the ring on #5 is broken, why you have so much carbon build up on the valves...?
I assume this is the same engine which is shown on your website and a pretty good clue as to who is responsible. Seems like a pretty substantial misrepresentation of product.
Poorly installed seals and gaskets appear to be part of the problem, but that's just the beginning. Thom - did your mechanic tell you why the rocker shafts backed out, why the ring on #5 is broken, why you have so much carbon build up on the valves...?
I assume this is the same engine which is shown on your website and a pretty good clue as to who is responsible. Seems like a pretty substantial misrepresentation of product.
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From: springfield, MO USA
Thom, I don't know if you are comfortable about naming names, etc, but could you give some sort of clue as to who did this work? If I ever had need of this, I would be VERY unhappy, almost to the point of seeing what kind of legal remedy was available. I Had a BMW 2002 years ago that had comprable work done. Place is no longer in business.
