water pump: short-hub vs long-hub

[waqas]

Hallo all,

I was about to purchase a new water pump for my 250 (129.98x), but discovered there were two types: the short-hub 105mm (1102001020) and the long-hub 135mm (1102000920). I thought the long-hub version was only an option for the 130.xxx engine? (depending on the pulley used)

Is there a way to tell which one I already have on the engine without removal?

Thanks in advance.

WAQAS in Austin, Texas

[bpossel]

Hello Waqas,

I replaced my water pump when I removed my air-conditioning.  With air-conditioning, you need the water pump with the shorter shaft/hub.  Without air-conditioning, the water pump with the longer hub is used.  Also, a different pulley is req'd based on which pump is used (with or w/o air).

Attached picture shows my old and new pump.

Download Attachment: waterpump.jpg
54.51 KB

Bob

[waqas]

Thanks very much for the pic, Bob! Very kind of you...

I've concluded that mine is the short hub, but I'll be able to confirm this once I remove the pulley during installation. The pump is enroute... let the waiting begin!

During all this, I noticed some belts starting to fray. Anything special about the belts? Or will any v-belt from the local auto store work fine? (with the correct length, of course)

Muchas Gracias,

WAQAS in Austin, Texas

[bpossel]

Hi Wagas,

I recall having a hard time finding a belt that would properly fit.  I ended up just bringing home several from NAPA auto parts store and, throught trial and error, finding one that fit.

Not sure if others had a similar issue?

Bob

bpossel  (Memphis, TN.)
'71 280SL  /  '97 E320