[Last Mohican]

So I finally pulled the cover and checked the clearances. It is anywhere from .003 - .008 depending on where you check it on each blade. What should the clearance be and is this far enough out to make a significant difference? I would really rather just run it for the summer and maybe pull it apart and clean it up this winter.

It's a little hard to check with the rust that has already formed since I went to the lake on Saturday. Obviously it's no stainless wear ring. I know it ain't beautiful but for a lake boat it looks OK to me. I'm just a car guy though so I know nothing about pumps. And before you say it, I do not have the $$$ to change to a Berk or for an energizer kit right now.

 

[1975sleekcraft]

dam

that thing looks like it has been through world wars! that is tight enough. mine was out a 1/4 inch once. it still worked it was just sloppy as hell. it took a while to get on a plane and even longer to reach any speed! it was just like a slipping tranny except it would catch up with it self. yj are flow pump. american turbine and berks are pressure pumps. i doubt i could get away with that now.
after i shimmed my yj back to where it needed to be, it hit hard again!!

if you ever need to tighten up your tolerances, you shim the thrust bearing. 4 bolts on the front of your pump.

your impeller has seen some rocks!

i dont know what others will say but here it goes
i filed out the leading edges of my impeller. it gave me a noticeable difference!!

yj has an adjustable nozzle. when i adjusted mine almost all the way up it made mine faster! the drawback to adjusting it up is it dosent handle rough water very well! it is easy to adjust!

i know there is more but im done for now

 

[jetboatperformance]

Assuming the blade to Wear plate measurements are consistant (which does not appear to be the case) and the thrust has "0" fore aft shaft movement allowance you can "damn near" run this impeller down to a couple thou' Tom

 

[Last Mohican]

I know it looks pretty bad. So how do I check the thrust front to back? I'm guessing reach through the hand hole and see if I can move it.

EDIT: Or just say PHQ IT and run it till it grenades?

 

[jetboatperformance]

Dial indicator The "Blade" does look a little grim your probably leaving some performance on the table call if you need help Tom

 

[1975sleekcraft]

impeller and shims

here is my old YJ impeller. it is a "B" cut. just FYI jacuzzi B rates with a berk A.
a jacuzzi A rates with a berk AA. the shims are two different thicknesses.

 

[Last Mohican]

here is my old YJ impeller. it is a "B" cut. just FYI jacuzzi B rates with a berk A.
a jacuzzi A rates with a berk AA. the shims are two different thicknesses.

How do you know which cut it is?

 

[Last Mohican]

Dial indicator The "Blade" does look a little grim your probably leaving some performance on the table call if you need help Tom

What are the potential hazards of continuing through this season with it? It's damn hot here right now. I really don't want to tear the pump apart in this heat. on top of that we are taking a vacation this month. We are both self employed so vacation means no income.

Energizer kit may make a good winter project.

 

[1975sleekcraft]

What are the potential hazards of continuing through this season with it? It's damn hot here right now. I really don't want to tear the pump apart in this heat. on top of that we are taking a vacation this month. We are both self employed so vacation means no income.

Energizer kit may make a good winter project.

you have nothing to worry about.
grease your front and rear zerks and play!!

 

[Last Mohican]

How much grease? I put 3 or 4 pumps in the rear and I could feel the gun "stiffen up" a little on the last pump. I put 10 in the front and it just felt like I could pump forever.

 

[1975sleekcraft]

i would start a new thread!

here is what i was told to do. pump grease till you see it come out the weep hole. thats perfect.

more recently read on a thread that the way i was taught was wrong.
i didnt pay to close attention to what was the right way, but i am all ears too.

i put 35 to 50 pumps?