davenew

Here's the old pump housing. It appears the leak was due to the o-ring being dry rotted. I was able to turn/tighten all four housing screws about 1/8 turn.
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-724x.jpg">

The old impeller. Notice the concave area between the blades. THe new one is not the same. The motor and this impeller have a magnetic coupling. THe oring is more square than round
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-725x.jpg">

Very dry rotted square oring.. that should be round.
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-726x.jpg">

The motor with the magnetic coupling, that the impeller assy (shown above) fits into.
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-727x.jpg">

Backside of impeller assy. No oring on this side.
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-728x.jpg">

Old vs. new impeller assys. If you look closely, you'll see two differences.
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-729x.jpg">

New
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-730x.jpg">

Old
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-731x.jpg">

New, with oring
<img src="http://dave-new.com/S4/after_run_pump/pump_compare/Mvc-732x.jpg">

I'll bet anyone $20 that installing a new oring into the old housing would fix the coolant leak. You would need a new oring with ID=1.690" and 0.075 THK. The impeller housing surface that the oring fits around is 1.695" Yea, you would probably need to convert to mm. Maybe someone that would like to save $125 can beta test it

Mat Indukts Lambos

I have a nice selection of o-rings too.

Nick Gustas

"Emergency" repair, but as far as I know it's still good.


If mine ever leaks I'll just do that or a new o-ring plus sealant.

VerrÜckt

Started leaking shortly after a year. I need to fix it this winter. :-(

Eric 2.7

Not my pump. The housing on mine was basically crumbling.

davenew

If the plastic gets brittle I guess a new oring wouldn't help much. How many miles on yours at the time?

Nick Gustas

Not too bad, better sealant job and/or a new o-ring would probably fix it if nothing is cracked yet.

nyet

my housing self destructed at around 80k

Mark P

I'd be willing to try a new oring first if it looks like that's the only issue.

Where did you buy your new $125 pump from? Just curious to see if it can be had for cheaper than that if I end up needing one

Eric 2.7

and more or less came apart with very little effort.