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should I trash my NOS metal impeller waterpump?

 
Old 05-28-2013, 06:05 PM
  #16  
ROG100
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If you do not know the history of your water pump do not take a chance.
We recently bought a large batch of "Laso" water pumps only to receive new pumps that were not Laso.
We sent them all back but I am sure they will surface somewhere else so beware. Laso are hard to find at the old price at the moment. New prices are a lot higher now.

Laso will say Laso on the casting and come in a blue and white box - it will have a plastic impeller and the extra bush between the impeller and shaft. The last Laso with a metal impeller was at least two years ago.

Porsche water pumps are about $1000 about twice the price of a Laso.

WE stopped selling rebuilt pumps about three years ago. It was about that time that we got Laso to add the extra bush and ultimately change to the plastic impeller.

If it was a new Laso and purchased from 928sRus it would at the very least have the extra bush and metal impeller.
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Last edited by ROG100; 05-28-2013 at 06:10 PM. Reason: more info
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Old 05-29-2013, 12:16 AM
  #17  
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the cost of an engine vs a "thrown in" unknown old waterpump when you bought the car is a no brainer.....toss the old one and spend a little $$$ for piece of mind knowing your 928 is solid for a long time with a proper "improved" part....
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Old 05-29-2013, 08:29 AM
  #18  
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Originally Posted by GregBBRD View Post
A new NOS water pump, with a metal impeller must be a Laso. Porsche quit making pumps with metal impellers a long, long, time ago.
Doh! Right. I forgot about that.

The last new out-of-the-box Porsche pump I touched was less than $600, so that tells you how long my Alzheimer's has had to erase the impeller material from memory.
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Old 05-29-2013, 07:51 PM
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Here are some pics I had taken before I installed it. Bought from Pelican Parts around June of 2010, cost around $315. Has about 20K on it now.

I'm pretty sure the stamp under the part # (upside down) says LASO but I could be mistaken. Am I safe?
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Old 05-29-2013, 08:07 PM
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I am confused on what Porsche actually used and what they are now using. Did they use a plastic impeller originally on the 928 and have they ever upgraded the design on the OE pump? Then did Laso start using the metal impeller but are now back to using the plastic impeller.
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Old 05-29-2013, 08:12 PM
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I put a new metal impeller Laso on mine about 3 years ago this summer. I think that's about 18k miles. Is there a way to verify that the impeller isn't drilling my block?
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Old 05-29-2013, 11:24 PM
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Kyle,
That is a Laso with metal impeller and the extra bush so you are good to go.
Roger
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Old 05-29-2013, 11:26 PM
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I am confused on what Porsche actually used and what they are now using. Did they use a plastic impeller originally on the 928 and have they ever upgraded the design on the OE pump? Then did Laso start using the metal impeller but are now back to using the plastic impeller.
Do not be confused - they originally used a metal impeller but changed to a plastic impeller.
All good new WP's have a plastic impeller. Do NOT use a rebuild!!!!
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Old 05-29-2013, 11:27 PM
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Originally Posted by namasgt View Post
Just buy a plastic impeller.
Please start a new thread and show us how you've been able to accomplish this. I'm sure we will all be waiting for the results.
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Old 05-29-2013, 11:28 PM
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I put a new metal impeller Laso on mine about 3 years ago this summer. I think that's about 18k miles. Is there a way to verify that the impeller isn't drilling my block?
Take it off and check it - you would hear the grinding noise - use a stethoscope to listen.
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Old 05-29-2013, 11:37 PM
  #26  
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Originally Posted by ROG100 View Post
Kyle,
That is a Laso with metal impeller and the extra bush so you are good to go.
Roger
100% correct!

I've never seen a Laso with the "extra" bushing have the impeller come loose.

I believe that this modification was done because Roger convinced them there was a problem and they came up with this solution.

And, of course, the newest iteration, with the plastic impeller, is completely Roger's doing.

Way to go, Roger!
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Old 05-30-2013, 12:25 AM
  #27  
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That makes me feel better about my stash of extra waterpumps- the metal impeller Laso I have has the bushing, purchased May 2009:




And the 24 year old metal impeller NOS Porsche waterpump I picked up today:





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Old 05-30-2013, 12:31 AM
  #28  
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The downside to the plastic impeller is the impeller can come loose and slip causing a higher RPM overheating issue. Not as big an issue as block damage but can be somewhat hard to figure out...heard of it many times over the years.
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Old 05-30-2013, 11:49 PM
  #29  
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Originally Posted by OTR18WHEELER View Post
OMG, I dont even know what type WP I just had installed (925 miles ago), you guys are freakin' me out with all the what parts not to use.
The mech took this photo of the new WP install. Can anyone identify from this pic if I have a good one ore a bad one?
[IMG][/IMG]
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Old 05-31-2013, 12:01 AM
  #30  
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Originally Posted by OTR18WHEELER View Post
The mech took this photo of the new WP install. Can anyone identify from this pic if I have a good one ore a bad one?
[IMG][/IMG]
Where did you/he get it?
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