Thrust Bearing Failure - Why is this happening ?
03-02-2009, 02:06 PM
#47
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Knowing Greg he has many brilliant tricks up his sleeve.
I can't speak for him and say he endorses them, but I am pretty sure he has installed more Super Clamps then any other single 928 mechanic so far.
I can't speak for him and say he endorses them, but I am pretty sure he has installed more Super Clamps then any other single 928 mechanic so far.
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David Roberts
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03-02-2009, 02:56 PM
#50
Rest in Peace
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I just work on mine and a few others, I have no where near the tricks that you, Greg and others here have.
The only two non stock parts on my car are the clamp and if I ever get the motor finished the Porken tensioner.
03-05-2009, 03:45 PM
#51
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My avatar is just a likeness, I have an S4 with RDK and digital dash.
03-05-2009, 03:53 PM
#52
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From the New visitor FAQ thread posted at the top of this forum:
https://rennlist.com/forums/3480841-post38.html
That's been in there over 2 years now.
https://rennlist.com/forums/3480841-post38.html
That's been in there over 2 years now.
03-05-2009, 05:03 PM
#54
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Hi Feargal,
Again, sorry to hear about this. I have talked to a few of people in your position and it is not an envious position to say the least.
Before buying any parts I would recommend, if this hasn't been done already, the engine be removed, torn down and the internal parts examined closely to find just what has been damaged and what can be salvaged. Then go from there as to what your course of action should be.
There are a few resources on this forum which can help you and possibly your mechanics in figuring this all out. One such resource is Greg Brown who posts to this list and is probably the most knowledgable 928 engine builder we have.
Please feel free to contact me by PM or at constantine@blackseard.com if you want to bounce something off someone other than this forum.
Best regards,
Constantine
Again, sorry to hear about this. I have talked to a few of people in your position and it is not an envious position to say the least.
Before buying any parts I would recommend, if this hasn't been done already, the engine be removed, torn down and the internal parts examined closely to find just what has been damaged and what can be salvaged. Then go from there as to what your course of action should be.
There are a few resources on this forum which can help you and possibly your mechanics in figuring this all out. One such resource is Greg Brown who posts to this list and is probably the most knowledgable 928 engine builder we have.
Please feel free to contact me by PM or at constantine@blackseard.com if you want to bounce something off someone other than this forum.
Best regards,
Constantine
The engine has been removed and I have seen the damage for myself, 2-3mm groove at thrust face of block - not as bad as pictures I have seen on here but bad enough. I'll take pictures when I'm next down at the shop.
The crank also has scoring which you can feel with your finger nail but may be salvaged with some machining - is it possible to do this ?
I thought a new short block would come with a new crank anyway ?
P.s. I was shocked to learn that Porsche actually have brand new short block engines in Germany, a snip at £5,500. I didn't think they would have any left.
Thanks for your help, I'll be in touch.
03-05-2009, 07:16 PM
#55
Drifting
Apparently Paul Anderson in Stroud has recently repaired a TBF engine that suffered damage to the block, but I don't have any details. I think an engine swap might be the cheapest option, but still worth considering a repair I guess.
03-05-2009, 07:20 PM
#56
Drifting
From an owner who had recently visited Paul A in Stroud:
Had the usual excellent chat with Paul and he showed me an engine
that had just finished being repaired after thrust bearing failure.
Amazed to hear that he can actually fix it even when the thrust bearing
has completely gone and the block eaten into as well.
that had just finished being repaired after thrust bearing failure.
Amazed to hear that he can actually fix it even when the thrust bearing
has completely gone and the block eaten into as well.
03-05-2009, 07:47 PM
#57
Racer
Stoopid Noob Alert!
While checking the WSM for Circlip/shim endplay setup there appears to be an error in the math in the example given.
A PDF is below of the page.
In the example given:
X=A-B+0.5mm Preload
A = 12.2mm
B = - 7.4mm
_______
4.8mm
Preload = + 0.3mm
_______
X = 5.1mm
Install shim having thickness X (in example 5.3mm)
Shims are available in thicknesses of 0.2mm, 0.5mm, 1.0mm
I am assuming Preload should be 0.5mm to make X 5.3mm but just wanted a more authoritative confirmation that this is a typo in the WSM
Thanks
Joe
Stoopid Noob but smarter than the average bear
While checking the WSM for Circlip/shim endplay setup there appears to be an error in the math in the example given.
A PDF is below of the page.
In the example given:
X=A-B+0.5mm Preload
A = 12.2mm
B = - 7.4mm
_______
4.8mm
Preload = + 0.3mm
_______
X = 5.1mm
Install shim having thickness X (in example 5.3mm)
Shims are available in thicknesses of 0.2mm, 0.5mm, 1.0mm
I am assuming Preload should be 0.5mm to make X 5.3mm but just wanted a more authoritative confirmation that this is a typo in the WSM
Thanks
Joe
Stoopid Noob but smarter than the average bear
03-07-2009, 11:36 AM
#58
Rennlist Member
Noobie question! On the subject of TBF and damage to the block why is it not possible to build up the damaged block and bearing girdle locally with weld then machine them to the original size. The alloy head on E type Jaguars commonly corrodes due to owners neglecting to keep the antifreeze up to strength causing the water galleries enlarge till they hit the combustion chamber. The cure for this is to build up the corroded area with alloy weld then reshape using files and a die grinder. The same method is used on racing Jags to fill the spark plug hole then redrill and tap it for smaller dia motorbike plugs so that larger valves can be squeezed in. Is there something special about the layout or even the alloy that would stop this method being used in a 928.
03-07-2009, 11:53 AM
#59
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Paging Greg Brown...
Both above questions can best be addressed by Greg Brown who probably has more experience with the 928 engine than anyone else outside of Porsche AG.
Suggest if he doesn't respond he be queried through PMs to find your answers.
Cheers,
Constantine
Suggest if he doesn't respond he be queried through PMs to find your answers.
Cheers,
Constantine
03-07-2009, 04:39 PM
#60
Drifting
Out of curiosity, what happens if you measure and find that it's out of spec, yet no damage has occurred? Is it possible to throw in a set of bearings and call it a day?