'87 S4 Timing Death
#361
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I think that a measurement of the water pump pulley diameter must also be taken into account as a smaller diameter pulley will make the PKT go to extended range
I have seen different styles of water pump pulleys
I have seen different styles of water pump pulleys
Last edited by Mrmerlin; 05-28-2016 at 01:29 AM.
#362
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#364
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The roller(s) make sense for an unmanaged belt system Imre. As does a warning system.
None of these things appear on any V8 that I know of. Virtually any automotive engine, either.
Manual tensioners are for four cylinders at best. (Which is why Gates recommends a tensioner/damper system.)
None of these things appear on any V8 that I know of. Virtually any automotive engine, either.
Manual tensioners are for four cylinders at best. (Which is why Gates recommends a tensioner/damper system.)
#365
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I'm certainly wrong. Don't listen.
Anyone here want to bet that the instructions for Ken's Portensioner don't change to tell people to retain this roller?
#366
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None of these things appear on any V8 that I know of. Virtually any automotive engine, either.
Manual tensioners are for four cylinders at best. (Which is why Gates recommends a tensioner/damper system.)
Manual tensioners are for four cylinders at best. (Which is why Gates recommends a tensioner/damper system.)
And maybe it was the very first timing belt this long in late 70ies, so porsche was a bit worried about this.
Gates, recommends tensioner/ damper system, meanwhile they produce a timing belt for a car Having a different system. Don't you think that porsche and Gates were aware of this when they decided how the belt had to be, years ago?
I do not believe that Gates and/or Porsche made belt and tension system on wishful thinkings you were talking about at first pages.
Regards, Francesco
#370
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#371
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I will measure this for you next time I am at the car, but it was a new genuine Porsche pump ~1500 miles ago. I will measure the new cam gears (Roger) and oil pump gear (Porsche) as well.
#372
Team Owner
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HAI as a side note did the water pump sit on 2 pins to locate it to the block? if one or both were removed then the pump could migrate upwards thus increasing the amount that must be taken up
#373
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Actually not British humor at all. I made the decision to remove the lower rollers/guides on my cars as I personally do not see a need for them at all. I am also very happy to get rid of the stock de-tensioning system as I see no use for it at all. I was very happy to change out the lifters for lightweight ones. I was happy to install the vacuum pump system on the GTS. I was very happy to install modified S3 cams in my GTS. I also added a wider throttle body and was happy to do so. I have made many modifications to my cars and completely at peace with my decisions.
I just bought a V12 Mercedes when everyone tells me I am nuts because the engines blow up.
I guess I am not a conventional person at all. 8>)
I just bought a V12 Mercedes when everyone tells me I am nuts because the engines blow up.
I guess I am not a conventional person at all. 8>)
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."![thumbsup](https://rennlist.com/forums/graemlins/bigok.gif)
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
![thumbsup](https://rennlist.com/forums/graemlins/bigok.gif)
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
![thumbsup](https://rennlist.com/forums/graemlins/bigok.gif)
#374
Nordschleife Master
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Actually not British humor at all. I made the decision to remove the lower rollers/guides on my cars as I personally do not see a need for them at all. I am also very happy to get rid of the stock de-tensioning system as I see no use for it at all. I was very happy to change out the lifters for lightweight ones. I was happy to install the vacuum pump system on the GTS. I was very happy to install modified S3 cams in my GTS. I also added a wider throttle body and was happy to do so. I have made many modifications to my cars and completely at peace with my decisions.
I just bought a V12 Mercedes when everyone tells me I am nuts because the engines blow up.
I guess I am not a conventional person at all. 8>)
I just bought a V12 Mercedes when everyone tells me I am nuts because the engines blow up.
I guess I am not a conventional person at all. 8>)
The engine that is now in the car has PKT, Gates racing belt, lightweight VW flat lifters, modified S3 cams with lobes matching these lifters, single beehive valve springs set to custom load, ported intake, etc. I just got a twin turbo V12 Mercedes too! Talk about "correlated errors"... ;-). I think that the Obama administration may have to regulate separate bathrooms for the two of us...
#375
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I agree in the standalone case of the crank gear, however if there is wear on the cam gears, oil pump gear and some slight wear in the water pump bearing - the compound effect is significant - read perfect storm.
I think that a measurement of the water pump pulley diameter must also be taken into account as a smaller diameter pulley will make the PKT go to extended range