TBF carnage photos
05-15-2009, 09:35 AM
#16
Craic Head
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I would think the only reason the block is toast is because it's been run with all those metal shavings splashing around in the oil.
Anyone?
05-15-2009, 10:52 AM
#17
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Agree with Mike Frye, looks normal to me other than the dial results. Blackness can be anything. I have seen more METEOR GREY cars with TBF than others .... hmmmmmmmm
05-15-2009, 11:18 AM
#18
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05-15-2009, 01:43 PM
#19
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When I first learned of TBF, I felt the same way. I figured you could clean it up, put in a new thrust bearing, and go. Of all the research I have done on the subject, I have only heard of a couple of cases of the block being repaired. After talking with Greg about it, there are a few things you have to consider. And Greg, if you have any additional comments that I missed, please chime in here.
1. Is the crank still good? Its a gamble if you ask me. Would you spend the time to rebuild an engine with a crank that you know had extreme temperatures dealt to it? Cranks are plenty though still around $500
2. What about the oil pump and pasageways? Did any of this get extra wear? If the oil pump needs replacement, the engine is shot anyways.
3. If the thrust bearing spun, and they usually do, how much labor will be involved to fix the block? (this is the big one)
4. How much are oversized thrust bearings?
5. Not only did the crank, and thrust bearing get hot, but the surrounding casting too. Did this heat cause any detrimental damage to the block that could cause failure later down the road?
It's been brought up, that someday when 928 engines are hard to come by, repairing a block might be an alternative. But right now, it is a lot cheaper to get a short block or used engine and go with it. I got a short block for $1200. Unless you were worried about keeping numbers matching in your car, you would be hard pressed to handle all of the items listed above for anywhere near this amount, unless you had your own machine shop, and your time was worth nothing.
1. Is the crank still good? Its a gamble if you ask me. Would you spend the time to rebuild an engine with a crank that you know had extreme temperatures dealt to it? Cranks are plenty though still around $500
2. What about the oil pump and pasageways? Did any of this get extra wear? If the oil pump needs replacement, the engine is shot anyways.
3. If the thrust bearing spun, and they usually do, how much labor will be involved to fix the block? (this is the big one)
4. How much are oversized thrust bearings?
5. Not only did the crank, and thrust bearing get hot, but the surrounding casting too. Did this heat cause any detrimental damage to the block that could cause failure later down the road?
It's been brought up, that someday when 928 engines are hard to come by, repairing a block might be an alternative. But right now, it is a lot cheaper to get a short block or used engine and go with it. I got a short block for $1200. Unless you were worried about keeping numbers matching in your car, you would be hard pressed to handle all of the items listed above for anywhere near this amount, unless you had your own machine shop, and your time was worth nothing.
05-15-2009, 02:00 PM
#21
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How much do you want for one? Maybe I'll build my coffee table with the ability to be transformed back into an engine some day if prices miraculously skyrocket on our 928's. How did you end up with those? by the way...
05-15-2009, 04:27 PM
#23
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05-15-2009, 09:29 PM
#24
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Which portion of the thrust bearing is "oversized" i.e. grind the crank to fit? or oversized so you need to machine material from the block? Interesting to explore, but I seriously doubt this engine will ever go back into the same car.
05-16-2009, 01:36 PM
#26
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05-16-2009, 06:02 PM
#27
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OK, I'm going to say it. I don't see anything except the results on the dial indicator. What am I looking at?
When you say carnage, I think of the grenaded rods that were in the other thread a few days ago with parts missing and holes blown through the oil pan.
On this one, I'm only seeing a lot of play where the main bearings should be holding things in place.
Someone tell me what I'm looking at?
When you say carnage, I think of the grenaded rods that were in the other thread a few days ago with parts missing and holes blown through the oil pan.
On this one, I'm only seeing a lot of play where the main bearings should be holding things in place.
Someone tell me what I'm looking at?
To me this looks totally salvagable.
There is a lister here (Brian, he rarely posts but I know him personally) that repaired his S4 block. He machined the area out and installed a simple shim (lookes like large a washer) then used an early 32V thrust bearing (they have larger surface area and I think they are thicker than the S4) and it worked like a charm. I saw the block when it just came back from machining and a few months later saw it running. This was a couple years ago and the repair is still holding like it did on day one.
05-16-2009, 06:53 PM
#29
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This thread is the exact reason why we developed the Super Clamp. No one realizes all the headaches involved with a TBF'd engine until it happens to you. Thankfully Mike can do a lot of the wrenching himself. For those that are not so capable, it will mean a lot of money to hopefully get an engine that runs the first time with no problems. Some have had to rebuild an engine two or three times before it's right.
When we set about to correct the OE front flexplate clamp, other lesser means were considered, tested and discarded since the outcome from the clamp not working could result in TBF, a risk we did not want to consider. That's why we did not cut any corners with the clamp's design which unfortunately means it must be installed during a TT R&R. But now with the Super Bearings for 928 TTs, we've given owners another good reason to put one in WYIT.
Thought to mention our products in a very appropriate thread. Mike, hope you don't mind!
Cheers,
Constantine
When we set about to correct the OE front flexplate clamp, other lesser means were considered, tested and discarded since the outcome from the clamp not working could result in TBF, a risk we did not want to consider. That's why we did not cut any corners with the clamp's design which unfortunately means it must be installed during a TT R&R. But now with the Super Bearings for 928 TTs, we've given owners another good reason to put one in WYIT.
Thought to mention our products in a very appropriate thread. Mike, hope you don't mind!
Cheers,
Constantine
05-17-2009, 02:36 AM
#30
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This thread is the exact reason why we developed the Super Clamp. No one realizes all the headaches involved with a TBF'd engine until it happens to you. Thankfully Mike can do a lot of the wrenching himself. For those that are not so capable, it will mean a lot of money to hopefully get an engine that runs the first time with no problems. Some have had to rebuild an engine two or three times before it's right.
When we set about to correct the OE front flexplate clamp, other lesser means were considered, tested and discarded since the outcome from the clamp not working could result in TBF, a risk we did not want to consider. That's why we did not cut any corners with the clamp's design which unfortunately means it must be installed during a TT R&R. But now with the Super Bearings for 928 TTs, we've given owners another good reason to put one in WYIT.
Thought to mention our products in a very appropriate thread. Mike, hope you don't mind!
Cheers,
Constantine
When we set about to correct the OE front flexplate clamp, other lesser means were considered, tested and discarded since the outcome from the clamp not working could result in TBF, a risk we did not want to consider. That's why we did not cut any corners with the clamp's design which unfortunately means it must be installed during a TT R&R. But now with the Super Bearings for 928 TTs, we've given owners another good reason to put one in WYIT.
Thought to mention our products in a very appropriate thread. Mike, hope you don't mind!
Cheers,
Constantine
