Pump seal not sealing against pump shoe

LBE

LBE

Eddie Would Go.
Location
Charlotte, NC
Put a new alum pump shoe in the B1. Pump shoe went in fine and sits flush like it should. When I went to install the pump, there is a small gap between the "packing" seal and the shoe. The dowel pins are lined up and that limits how far foreward the pump will sit. I have a couple other pump seals, but they sit the same, and the lip that holds it inplace does not allow me to double up those seals (just a thought). The short shaft is not on, so the pump is not limited by that.
Any ideas how to cure this?

I don't think a new seal will fix the issue. A new one might touch the pump shoe, but without any pressure on it, it would blow water by.

I also thought about silicone, but that is sort of a bandaid and not the correct fix.
 
227

227

Its all about the surf!
Location
Oceanside, CA
Eddie is the aluminum pump the same size as stock? Maybe it should have been mounted further back? If you can you pull it I 'd try and install the pump with out the shoe and mark were the shoe should sit in order to seal correctly, then reinstall the shoe
 
godocgo

godocgo

sport
Location
s. fla
mine went in the b1 fine. any chance your installing the pump complete? did you try just the wear ring by itself?
 
S

sflsurfrider

godocgo said:
mine went in the b1 fine. any chance your installing the pump complete? did you try just the wear ring by itself?
Click to expand...

if theres enough room to *possibly* put a second packing in there, i wouldnt think itd be pump alignment. :dunno:

eddie, how large a gap are you talking about, and is it even all around?
 
Flash-FX

Flash-FX

No Square..No Round..FX-1
Location
South Jersey Shore
When I set up my Pump/aluminum shoe, I had a dummy engine with couplers and also the mid shaft assembly installed. Then adjusted (shimmed) the pump with drive shaft for proper alignment. The pump shoe didn't actually sit perfectly flush (on the front side) against the bulkhead. The alignment was done without the seal in place so that it could be set square to the pump face. I mixed up a slurry of epoxy/404/cabosil and "glued" the shoe in place filling that gap. The screws just kept it aligned until things cured.

You might have to do a similar process but biasing it (the shoe) a little more rearward (bigger gap) still keeping the faces parallel until things cure (thickened epoxy worked well). Pump air leaks are nothing but headaches. Use some heat to help removing that shoe...good luck.

File photo below.
 

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LBE

LBE

Eddie Would Go.
Location
Charlotte, NC
sflsurfrider said:
this goes with anything.....except for doinking.
Click to expand...

I concur doctor!

Think I got it. The packing set against the pump shoe with the bolts in loose. When I would tighten the front 2 bolts, the bottom of the packing pulled away from the shoe about 1/8 in. Not much gap, but there is no way that would fly.

I took a couple pieces of plastic and made 2 rings for spacing. Basically Cool WHip tops and used the "packing" as a template. Put those on the pump with lotsa grease, then placed the packing seal on top. That took up the gap. Then I shimmed the rear of the pump and it seems to have a tight seal.

I don't think that pump shoe is off, the intake grate bolts line up perfect.

Hindsight: dryfit could have solved this issue.
 
R

restosud

if the gap is 1/8" you should try to reposition the shoe.
something about the shoe is different if the pump doesn't line up like it did with the oem one even if the grate bolts line up!
last thing you need there is an air leak.
you shouldn't have to use more shims as you now probably have a shaft misalignement issue as well.
 
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