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LD28 Water Pumps


johnc

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FYI... a big diesel supply house just sent me two gasoline L6 water pumps in sealed Nissan boxes with the LD28 part number on it (21010-17SY7). The owner of the supply house pooped his pants when I sent him a picture confirming the problem. He's talking with Nissan USA to find out what's up.

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Gas, Diesel, what's the difference?

 

(In some cubicle somewhere there is an MBA going "see! see! I TOLD you we wouldn't get any pushback on this. Give the guy some diesel pumps and hope he keeps his mouth shut!")

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I have yet to actually find a LD28 water pump for sale new anywhere. And I actually owned the Maxima that I needed one for. If you can find real LD28 water pumps please pm me the details after you get what you need. I kick myself for tossing a bunch of them in the recycling. I hate it when I do that.

 

Ray

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If he wants to let them go cheap since they're the wrong part I wouldn't mind having a spare... :mrgreen:

 

edit - oops I think I read that backwards. Never mind...

:oops:

 

You don't want to buy my regular gas L6 water pump for $175? :-)

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Well... it looks like my last source (JESCO) for the LD28 water pump has dried up. They are selling the gasoline water pump to the diesel guys for $175 each! Nice margin.

 

Maybe its time to machine a few impellers...

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John, RE: Impellers

 

If you get the sourcing worked out, perhaps buying 'bearing and seal cartridges' from the same source as the bulk reman shops do is a good plan for an 'upgrade kit'...

 

Basically make the impeller a shrink-on item, and people can take their old bearing housings, drop out the old impeller/bearing/seal package and refit the new items. This is the direction JeffP and I were going. Plenty of gas engine cores out there, but you want a new bearing and seal package to go with that new impeller.

 

If it's cast or even steel, a powder coat, or Techline heavy coat of abradable paint would work well to seal up impeller to casing tolerances as well... I think grooving the tips of the impellers and fitting a teflon wiper is going a bit far...

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That is the downfall of leaving the last company---they had a CMM and Five-Axis capabilities in-house. And PLENTY of apprentices that needed to do programming and setup. All I would have to pay for is the stock. Damn MBA's and their 'no touch parts operation' visions (that fail miserably...) :angry:

 

 

Keep in mind E-Pumps are constant flow for the most part. Unless you have one of the fancy models from Europe that has variable flow / variable speed. The question becomes "at which load point is the flow correct" with an E-Pump. How do you compensate for overcapacity (if it exists) at idle, if sized for maximum load. What happens if flow is lower than expected at full load? :(

Edited by Tony D
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Davies-Craig is the only speed-controlled electric water pump that I know of in the aftermarket tuner realm. I may be wrong, but they seem to have a good product. Used extensively in Formula Ford from what I understand. Think they have a pump controller based on water temperature.

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  • 5 months later...

Anyone have pictures of the two water pumps?

 

Like JohnC said, my local dealer says they have the LD28 pump in stock. I would like to have a visual reference so when I have to return it there isn't much left to question.

 

Joe - we have to check your parts box this weekend. I didn't even think to open it yesterday when I wrote down the part number.

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The LD28 pump impeller is far from not being cost-effective.

 

Do it the same way everyone else does; cut it from a casting. Cast, wheelabrade, collet chuck, face, turn, bore, done.

 

Total manufacture time can be less than 20 minutes from a hot melt. The problem is getting someone to stop the more lucrative work they are already doing, to setup to do your smaller, faster job.

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With setup and programming fees, new cartridges, cores, core cleanup, etc. its not cost effective - at least here in SoCal. I've researched it and given that the total sales will be 50 units over 5 years (if I'm really lucky), it just doesn't' work out. Secondly, tying my money up in 50 parts for years doesn't make business sense.

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