New aluminum prop rubs slightly

[3ric]

I have a 1985 Suzuki dt65. I bought it used with a stainless steel prop on it that seemed to fit just fine. I have since bought an aluminum prop to replace it. The new prop spins fine until I torque it down to the specified 40 ft/lbs, then it rubs just ever so slightly slightly on the gear case. I looked at the parts diagram and the assembly seems to be missing a 1 mm thick spacer/thrust washer which would probably provide the clearance the prop needs. Unfortunately, the washer is no longer in production, considered obsolete, and I can’t find one otherwise in the rather odd dimensions of 32.6x45x1 mm.

Any ideas on how I should proceed? Could I just fabricate one? I Don know that I could make it perfectly round, but I could get it pretty close. Does it need to be exactly 1mm thick or could it be say 3mm? Could it be a touch wider? Should I just sand a mm of the front of the prop?

 

[racerone]

Make one.

 

[3ric]

Would it hurt to have it an extra mm thick?

 

[Sea Rider]

Need to install a prop thrust washer thick enough for the prop not to rub against the propeller shaft housing or risk screwing it when the prop spins forward against it. A friend of mine didn't install a thrust washer on his new prop and in less than one hour at speed literally ate the prop housing, bad music !!

Happy Boating​

 

[3ric]

Finally found one that is pretty darn close in size at McMaster-Carr. Suzuki’s was 32.6 mm I’d and this one is 35, but otherwise same thickness and od. I think they called them ring shims or arbor shims