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should I trash my NOS metal impeller waterpump?

 
Old 05-27-2013, 11:25 AM
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DerkBarrington
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Default should I trash my NOS metal impeller waterpump?

I have a new waterpump that was purchased years ago that came with the 93 GTS I recently purchased. The pump is in new condition but after reading the threads on all the issues with metal impellers should I just trash it and buy a new one with the plastic or use it, but make a point of replacing it before it hits 20K kilometres?
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Old 05-27-2013, 11:47 AM
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Buy one of Ed's Guardian water pumps. Better bearings, it's designed to shear the high speed coupling if any thing binds the impeller, and will keep your valves from crashing. Ed drills and pins the impeller so it won't move. With Ed's pump and a Porken tensioner, you'll be set for years of trouble free driving. Send Ed the pump you have as a core. I had a Porsche rebuilt pump, and swapped it for the Guardian.

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Old 05-27-2013, 11:57 AM
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Just buy a plastic impeller.
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Old 05-27-2013, 12:38 PM
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It will also depend on what WP you have - new or rebuilt - and who made it or rebuilt it.
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Old 05-27-2013, 01:23 PM
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Unfortunately, I didn't purchase the water pump and its history is unknown.

roger, I'll be contacting you soon with a big list of parts required
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Old 05-27-2013, 11:09 PM
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Originally Posted by ROG100 View Post
It will also depend on what WP you have - new or rebuilt - and who made it or rebuilt it.
What Roger said.

If it is a NEW Porsche OE pump then it's ok with a metal impeller.

If it is a rebuilt pump or some random brand pump it is NOT ok.

Most rebuilt pumps have a sticker on the mating surface.
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Old 05-27-2013, 11:11 PM
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Originally Posted by DerkBarrington View Post
... but make a point of replacing it before it hits 20K kilometres?
A rebuilt metal impeller pump can eat the block in a few thousand miles. BTDT and have (sets of) pictures. Unless you're damn sure it's a Porsche OE NEW pump, throw it away, or send it to Ed Stanke for a proper rebuild into a Guardian Pump.
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Old 05-27-2013, 11:14 PM
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Thanks for the feed back. I'm going with a new pump.
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Old 05-27-2013, 11:18 PM
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+1 to Dave's posts.
A new pump is a wise Risk Assessment decision.
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Old 05-27-2013, 11:32 PM
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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.
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Old 05-28-2013, 01:07 AM
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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.

A metal Laso, without the "added" impeller bushing (Laso pump version #3.....or #4.....not sure) is virtually guaranteed engine "death".
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Old 05-28-2013, 05:55 AM
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Not anything significant to add, just to support that it must be old. The pump that came off my car, original Porsche, has a plastic impeller and a 95 date stamp.
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Old 05-28-2013, 08:37 AM
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Did you pay extra to get the WP when you bought the car? If not, it was "Free" and should be tossed

Just my $.02
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Old 05-28-2013, 05:50 PM
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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.

A metal Laso, without the "added" impeller bushing (Laso pump version #3.....or #4.....not sure) is virtually guaranteed engine "death".
How can I determine if mine falls under this category? It was purchased about 2-3 years ago.
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Old 05-28-2013, 06:03 PM
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Originally Posted by Opelotus View Post
How can I determine if mine falls under this category? It was purchased about 2-3 years ago.
Roger may know the specific dates that Laso made their "changes" to "improve" their water pumps. I don't know the specific dates....just know "about" when the changes were made.

Even then, people would have had "old stock" to sell off.
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