I'd be very careful pressing impellers on and off of shafts.
Water pumps usually have mechanical seals consisting of parts made of
graphite and ceramic, both of which are very brittle.

Engineman


On Jul 27, 2:12�pm, "Rick" wrote:
wrote in message

...





My Triumph consistenly runs warm and I would like it to flow a bit
more water. �The vanes on the impeller are minisule compared to other
water pumps with similiar displacement engines. �In the image the
2.0 / 2.5L engine displacement Triumph water pump with impeller is on
the left and the proposed donor impeller (from an Isuzu 2.3L) is on
the right.
http://i290.photobucket.com/albums/l...g/P1010003.jpg

How much press is needed for a cast iron or cast steel impeller? �My
machinery handbook gives a bit of a overview but no good suggestions.
I am thingking about 0.001 to 0.0013. �Your thoughts?

In trying to dismantle the two pumps, there is inadequate room to get
a bearing seperator between the impeller and the pump housing on
either pump. �My thought is to remove the pressed on fan mounting
flange and then press the shaft (with impeller attached) out of the
pump housing. �I got the pressed on fan mounting flange off of the
Isuzu water pump but did not succeeded in pressing the shaft out of
the housing (watching the deflection of the press and the increasing
effort on the jack hande, I stopped adding force). �I have a "30 Ton"
Harbor Freight A-frame press that I suspect is capable of about 20T.
Does my proposal in dismantling sound wrong? �I can cut the Isuzu pump
body apart if needed.

usually we drill a small hole in the old impeller hub along side of the
hardened shaft to remove the hub stress. The impeller will come off then.
You may have to cut the body of the Isuzu pump to get the bearing out. Some
have plastic �rings that lock the bearing into the housing.- Hide quoted text -

- Show quoted text -