Sanity check, tightness of new impeller

[rothfm]

Working on my '87 90hp rebuild. With no gear oil installed, and no impeller, the shaft turns nice and easy by hand. LU is off and on bench.

Once i put in the impeller and housing, it will turn but its very difficult. Lower is off the housing too, on a bench. Yea, blades are curved in correct direction.

Ive done alot of these and cant remember it bieng such a drag on movement. I put some vasoline in the housing on install.

Its tight enough, i feel it will be a drag trying to start the motor. I have 110lb compression on the loose powerhead. I bet once together, it wont spin up to speed to give me those readings again

Thoughts?

 

[racerone]

All normal.

 

[rothfm]

Thank you sir. That rubber sure was stiff going into housing. Just seemed tight. Probably will feel different as it takes its shape over time

Thanks

 

[James R]

I have done a bunch of 90s and they were all tight. No problem.

 

[gm280]

Just remember those impellors are a displacement type pump at low speeds and therefore have to be tight to work properly until high speeds. Then it becomes a centrifugal type pump. Sounds normal to me.

 

[oldboat1]

Like to check for that drag when getting ready to bolt up the l.u. -- feel the impeller turning when the shaft is turned.

 

[emdsapmgr]

That's the same impeller/housing used on all the crossflow V6 engines, so it's a heavy duty one.

 

[racerone]

I think even the V-8 looper uses it.