How To Replace a Plastic Pump Liner

[Tyrael]

That's some great info RX951. Would you recommend the plastic liner over a new steel (on SS) one? Looks like it works wonders for small clearances. Apart from replacing it more often, it there any other disadvantages?

[RX951]

The plastic liner is cheaper, but more prone to cavitation erosion or wear if you have alot of power in your set up or cavitaton due to an 800 grate in your setup.
I run a dynafly impeller and I like being able to pitch up [to an extent] with out having to get O.D. of the impeller machined.
The SS wear ring is definitely stronger. But you can get just as tight of a fit if not tighter wear ring to impeller clearance with a plastic liner also. I've ran both, but personally prefer the plastic liner.

Basically, if you look, the Sea-Doo guys run plastic liners in their pumps, But they are able to flip their liner and get more life out of it once they see some wear.

Its all personal preference. But remember that if you ever run a Dynafly impeller, the OD will increase when pitched up. If you run a SS liner, the impeller needs to be machined to properly fit in the liner housing. If you run a concorde impeller, the OD does not grow

Check this pic out. this is a tight fit. fresh install and you can see the shavings upon first crank.

[roost5o]

I had some trouble getting the sleeve in so I used a 2x4 with the hammer...well now that worked!!! BTW 350degrees wanted to melt the sleeve

[akjose]

I had some trouble getting the sleeve in so I used a 2x4 with the hammer...well now that worked!!! BTW 350degrees wanted to melt the sleeve

Sleeve goes in the freezer. Housing goes in the cooker

[roost5o]

Sleeve goes in the freezer. Housing goes in the cooker

I know that! What I am saying is that the housing at 350 wanted to melt the sleeve.

[Hybrid AWD]

On the machining aspect of it, is the OD of the plastic pump liner larger than OD of the SS pump liner?

[henn]

anyone? by the looks of the picture, the stainless ring comes out, but it doesnt look like much material has to come off after that, since it does not appear that any weld is added to the outside of the housing, looks like a pretty simple lathe job with that housing,

[OsideBill]

On the machining aspect of it, is the OD of the plastic pump liner larger than OD of the SS pump liner?

Yep

anyone? by the looks of the picture, the stainless ring comes out, but it doesnt look like much material has to come off after that, since it does not appear that any weld is added to the outside of the housing, looks like a pretty simple lathe job with that housing,

Yep pretty easy to do. I have found that after installing the liner, you go back and do cut for proper clearance they work perfect.

I have even used these for trial's on some 158mm impellers, cheap alternative for testing.

I will say for longevity I stick with the SST liners, expensive but much more robust and will get you home in an emergency. Skat makes the best replacement IMO

[Hybrid AWD]

Ahh so some quick math will give me the number for what I need to have my friend mill out the impeller housing too.

Thickness of the SS ring - Thickness of the plastic ring = amount to be milled. Easy enough. Now any tips for removing the SS ring?

Oven 350* for 10-15 minutes sound good?

[Hybrid AWD]

Another question I wanted to asked before the machining of the SS ring to accomodate the wear ring:

When you are doing the cut, are you adding in the clearance (.014-.01? From the looks of the pictures on the first page, it seems as though the impeller is cutting it's own groove.

Also, can someone give me the thickness of the wear ring. Carl @ Island racing is holding my parts (which includes the wear ring) until my special order Hydroturf comes in and I'd like to have this up and running next week.