18K mile water pump/tensioner failure
10-20-2016, 11:22 AM
#16
10-20-2016, 12:40 PM
#18
Former Vendor
I've probably got 50 clients that have given up on Laso pumps and are now using factory pumps....
I keep multiples of each kind, in inventory...and spend time telling people the honest truth about costs and failure rates.
Most all new clients choose Laso pumps....because of the cost savings.
Once they change one or two of them, they start to understand the false economy....
I keep multiples of each kind, in inventory...and spend time telling people the honest truth about costs and failure rates.
Most all new clients choose Laso pumps....because of the cost savings.
Once they change one or two of them, they start to understand the false economy....
10-20-2016, 01:04 PM
#19
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Lots and lots of Laso water pumps out there with a nearly zero failure rate over the last three years. My own records show less than 0.5% failure rate in the last three years. All failures were leaks from the weep hole.
Personally I am not convinced that the Porsche pump is any better as so few are actually sold - obviously mostly by Greg of course. I would feel better about the Porsche pumps if we had some meaningful statistics. That does not mean I do not believe what GB says - you pays your money you takes your choice.
I offer the Porsche pump as an alternative to the Laso but nobody wants them purely based on price. It is now 18 months since I last sold one.
Laso information - the early pump 77 to 86 is readily available and I sell for $275. The later 87 to 95 pump is no longer available in the USA. However the early pump can be used on any year 928 when used in conjunction with the PKT-S.
We also carry the early Laso pump modified for use on the later 87 to 95 cars for $465.
I will not sell rebuilds - even Porsche rebuilds.
Personally I am not convinced that the Porsche pump is any better as so few are actually sold - obviously mostly by Greg of course. I would feel better about the Porsche pumps if we had some meaningful statistics. That does not mean I do not believe what GB says - you pays your money you takes your choice.
I offer the Porsche pump as an alternative to the Laso but nobody wants them purely based on price. It is now 18 months since I last sold one.
Laso information - the early pump 77 to 86 is readily available and I sell for $275. The later 87 to 95 pump is no longer available in the USA. However the early pump can be used on any year 928 when used in conjunction with the PKT-S.
We also carry the early Laso pump modified for use on the later 87 to 95 cars for $465.
I will not sell rebuilds - even Porsche rebuilds.
__________________
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."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
10-20-2016, 02:47 PM
#22
Three Wheelin'
Here's some YouTube links to my second WP failure:
https://www.youtube.com/watch?v=z0es...ature=youtu.be
https://www.youtube.com/watch?v=e9gj...ature=youtu.be
10-20-2016, 03:18 PM
#23
Former Vendor
I'll say the same thing I've been saying for years and years:
"If Laso had never made 928 water pumps and the only source for water pumps had been Porsche, my client base would have been literally tens of thousands of dollars ahead.
Cheaper does not always mean more economical!"
"If Laso had never made 928 water pumps and the only source for water pumps had been Porsche, my client base would have been literally tens of thousands of dollars ahead.
Cheaper does not always mean more economical!"
10-20-2016, 04:00 PM
#24
Rennlist Member
PKT and Zerex GL-5 this time and last time. Before my first pump failure I added Water Wetter but without the AC I don't need it.
Here's some YouTube links to my second WP failure:
https://www.youtube.com/watch?v=z0es...ature=youtu.be
https://www.youtube.com/watch?v=e9gj...ature=youtu.be
Here's some YouTube links to my second WP failure:
https://www.youtube.com/watch?v=z0es...ature=youtu.be
https://www.youtube.com/watch?v=e9gj...ature=youtu.be
Thank you,
Dave
10-20-2016, 05:21 PM
#25
Three Wheelin'
https://rennlist.com/forums/928-foru...ater-pump.html
This was the post about my other WP failure. Looks like it was a little over 2 years ago...
This was the post about my other WP failure. Looks like it was a little over 2 years ago...
10-21-2016, 01:01 AM
#26
Intermediate
Thread Starter
Your original post is being read as though you can push the tensioner piston back into the tensioner body. Whether you meant to convey this meaning perhaps you can clarify. The only way I can see such happening would be if the threads in the tensioner body failed but I cannot see anyway that would cause the impeller to break away from the pump shaft unless the sudden slack in the belt jarred the bearing causing the job lot to trash itself.
Have you looked at the casing volute to see if there has been any damage due to the impeller touching the casing? It was not clear from your little vid whehter there was much play of the impeller on the shaft but it sure sounded unhealthy.
As Greg says it seems there is something radically wrong here and the big question at the moment is "what was the cause and what was the effect". Was the pump the cause of the incident or the victim of it?
At least you got the belt tension alarm and responded to it. When the pump impeller comes off my experience is that it is only a matter of seconds before the temperature indicator needle shoots up and the red alarm light screaming "high temp" illuminates- did you see any of this happen at all?
Rgds
Fred
Have you looked at the casing volute to see if there has been any damage due to the impeller touching the casing? It was not clear from your little vid whehter there was much play of the impeller on the shaft but it sure sounded unhealthy.
As Greg says it seems there is something radically wrong here and the big question at the moment is "what was the cause and what was the effect". Was the pump the cause of the incident or the victim of it?
At least you got the belt tension alarm and responded to it. When the pump impeller comes off my experience is that it is only a matter of seconds before the temperature indicator needle shoots up and the red alarm light screaming "high temp" illuminates- did you see any of this happen at all?
Rgds
Fred
10-21-2016, 01:13 AM
#27
Intermediate
Thread Starter
Roger is the one I have ordered all of my parts from to replace everything. As for where the broken tensioner and water pump originally came from, I do not know because I wasn't the owner of the car then. I do trust Roger when he tells me the water pump and the PKT tensioner will last its expected lifetime. He has been a tremendous help to me and I can not recommend him enough.
10-21-2016, 01:52 AM
#28
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The fluid had completely drained out of the tensioner, it was easily seen all below the tensioner. When I pressed on the belt, the pulley would push the tensioner piston back in. If there is no fluid in the tensioner for pressure, there is not going to be any force holding it back. As for the water pump, yes the impeller was rubbing on the casting. It has dug a very noticeable groove into the casting. I have attached two photos of it to the same link as the video.
10-21-2016, 02:20 AM
#29
Rennlist Member
The fluid " oil " that you add to the tensioner has NOTHING to do with setting or maintaining the proper tension. The factory tensioner is NOT pressurized or fed oil by the engine. It is a simple mechanical device and as such seldom actually fails.....that is what everyone was trying to tell you. The only way for it to be loose is that the adjustment bolt was not properly adjusted or the belt had stretched. Had the tension ever been checked while you have had the car ??
10-21-2016, 02:54 AM
#30
Nordschleife Master
Plastic impeller bearing sound
Until I accidentally came across this thread, I was certain it wasn't my waterpump of 4-5 years, with 700 miles on it.
TY.