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Old 10-30-2012, 10:11 AM   #1
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Question Plastic Bearings


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I purchased a set of bearings for my Saito 91 on the internet and when they arrived I discovered the retaining ring is made of a plastic looking material.

Anyone have any experience with this type of bearings.

It is indicated that they are very good for high speed but are limited to 250 degrees (assume the would be F).

Any comments.....
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Old 10-30-2012, 11:41 AM   #2
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Re: Plastic Bearings

This is a composite material good for more RPM than the steel cages can withstand. They are good.
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Old 10-30-2012, 12:36 PM   #3
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Re: Plastic Bearings

My brand new Saito .40 fourstroke had those in when new , it seized up while breaking in engine, I no longer buy Saito engines, Horizon told me the bearings were rusty that's why it seized ?????? Ok straight out of the box into the plane and rusty hhmmmm not a proper answer, later found out about these faulty bearings and like I said I no longer buy Saito period.
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Old 10-30-2012, 02:28 PM   #4
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Re: Plastic Bearings

If you are exceeding 250 F at your crank bearings you are going to have more issues than just melted cages
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Old 10-30-2012, 04:12 PM   #5
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Re: Plastic Bearings

Use an exacto knife or small screwdriver and pry off the rear seal off the front bearing and both seals on the rear bearing. CAUTION the rear bearing with seals is usually too thick and will cause the crank to hit the rear case. Order a seal less bearing for the rear. The bearings with metal dust cover will leak crank case pressure. Check your local industrial supplier or farm supplier.
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Old 10-30-2012, 04:49 PM   #6
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Re: Plastic Bearings

Quote:
Originally Posted by kip51035 View Post
Use an exacto knife or small screwdriver and pry off the rear seal off the front bearing and both seals on the rear bearing. CAUTION the rear bearing with seals is usually too thick and will cause the crank to hit the rear case. Order a seal less bearing for the rear. The bearings with metal dust cover will leak crank case pressure. Check your local industrial supplier or farm supplier.
And don't go pay $30 per bearings, you can get top notch bearings at your local industrial supplier for +- $20 for both. Btw, the Saito .91 bearings are the same ones than for the Os 46. ???
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Old 10-31-2012, 07:29 AM   #7
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Re: Plastic Bearings

Quote:
Originally Posted by kip51035 View Post
Use an exacto knife or small screwdriver and pry off the rear seal off the front bearing and both seals on the rear bearing. CAUTION the rear bearing with seals is usually too thick and will cause the crank to hit the rear case. Order a seal less bearing for the rear. The bearings with metal dust cover will leak crank case pressure. Check your local industrial supplier or farm supplier.
Not sure what the above has to do with the use of plastic retaining rings but thanks anyway.
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