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Lotus Europa Forums => Garage => Topic started by: TurboFource on Friday,April 08, 2022, 12:25:36 PM

Title: Cartridge style water pump question
Post by: TurboFource on Friday,April 08, 2022, 12:25:36 PM

Does the "cartridge" style water pumps for a Twin Cam use the standard water pump components?

Title: Re: Cartridge style water pump question
Post by: Grumblebuns on Friday,April 08, 2022, 09:28:19 PM

I had a Dave Bean cartridge style water pump om my long sold TCS. If I remember, you had to send you stock front cover in order to have it machined to accept the DBE water pump cartridge I never dad it apart to examine the internals. The only component that may be the same is probably the impellor. Why bother with a cartridge water pump, go with an EWP.

Joji Tokumoto

Title: Re: Cartridge style water pump question
Post by: TurboFource on Saturday,April 09, 2022, 03:10:50 AM

Joji,
Mine was modified with a cartridge style water pump created by the other owner,
I am currently having trouble sourcing a replacement bearing shaft and I am thinking
of sleeving the insert to hold an original style shaft, I was curious if the the other ones being
sold use the stock components as mine is one of a kind ….

Title: Re: Cartridge style water pump question
Post by: jbcollier on Saturday,April 09, 2022, 04:55:38 AM

Going by memory here.  Most water pumps use a 5/8" shaft but the TC's water pump uses a smaller shaft.  This means a smaller diameter bearing and fewer ball bearings which makes for a weaker pump.  I was under the impression that the cartridge pumps also used the larger shaft and bearings.  Measure up what you have and try here fro parts:

http://www.az-rpm.com

Title: Re: Cartridge style water pump question
Post by: TurboFource on Saturday,April 09, 2022, 06:17:48 AM

Thanks JB! Mine has a larger bearing (30mm) with .626" shaft for pulley and .501" for the impeller..it uses stock impeller and seal

Title: Re: Cartridge style water pump question
Post by: cwtech on Saturday,April 09, 2022, 05:07:24 PM

What is the O.D. of the Lotus bearing?   (You can measure the i.d. of the other timing cover.)

Title: Re: Cartridge style water pump question
Post by: TurboFource on Sunday,April 10, 2022, 03:42:41 AM

CW,
I measure .944" (24mm) with dial calipers.

JB, sent an inquiry to the place you suggested....fingers crossed.

Title: Re: Cartridge style water pump question
Post by: Lotuswins on Sunday,April 10, 2022, 12:47:49 PM

I have a Bean cartridge pump on my TC, installed back in 2000.  I bought the whole cover with pump, as Dave was having new made rather than deal with the old castings at that time.  IIRC Dave said the internals on the cartridge pumps were from an Esprit, but if you call Ken at Bean he can set you straight on what Esprit they came from, and possibly where to get those parts.

Jerry Rude
4005R

Title: Re: Cartridge style water pump question
Post by: TurboFource on Tuesday,April 12, 2022, 12:22:08 PM

Jerry,
Thanks for the idea...it turns out the bearing shaft from an early 907 engine (Esprit) will work in my custom made cartridge water
pump...Ray at RD Ent. confirmed the dimensions today and it should be on the way :pirate:

Title: Re: Cartridge style water pump question
Post by: TurboFource on Wednesday,April 13, 2022, 12:19:51 PM

Bearing shaft showed up today...(lightning fast service!) and it is correct!!! 8)

Title: Re: Cartridge style water pump question
Post by: jbcollier on Wednesday,April 13, 2022, 12:32:32 PM

(https://paulgauchi.files.wordpress.com/2019/01/january-a-team.jpg)