How to change bearings on a Saito 72FA - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-29-2009, 11:28 AM   #11
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Re: How to change bearings on a Saito 72FA

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Originally Posted by guyl View Post
If you live in the west area of Montreal, you could contact one of my sons
who are all machinists. One of my sons run his own company its call BELMAC.
514-425-0082 fax 514-425-0521 He is located in Terrasse Vaudreuil.

To pull out a bearing and seat a new one....if you dont know how to do it
or have mickey mouse tooling to do are better off to go to a
machine shop to have it is only a trivial matter for a machinist
to do it properly.

Tooling required - one wooden block, and a propane torch or a monokot heat gun.

The bearings in our engines are NOT MEANT TO BE PRESS FIT. With warming uo the case, and a rap on a wooden black they come out easily. To reinstall, warm the case again, and then place the rear bearing on the crankshaft and use that to replace it. The front bearing can also be done first, using the crank in reverse.

Replacing bearings is not hard, is not painful and is very easy - IF you do it the way it is meant to be done. NO need for a machine shop... period.

Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 04-29-2009, 12:02 PM   #12
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Re: How to change bearings on a Saito 72FA

Does this help. These simple tools can be made from appropriate size wood dowel.

See pictures.

The short piece will slide into the rear of the crankcase. It has a hole in it to clear the crankpin.

The long piece is of a diameter to sit on the outer race of the front bearing (mine has a shoulder) and a hole through it to clear the front of the crankshaft. See first picture.

The middle picture shows how it goes together, bearings not shown.

So, slide the rear bearing on the shaft. Slide the shaft into the heated case. With the shaft web sitting on the small anvil. Slide the long anvil over the shaft so it sits on the front bearing. See third picture. Hit/tap with a mallet until all feels solid.

Using this method the bearing alignment is assured by the shaft.

Ed S
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Old 04-29-2009, 02:49 PM   #13
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Re: How to change bearings on a Saito 72FA

Originally Posted by kip51035 View Post
Go to the next page I went through the whole procedure for a guy with an OS.46. If this is a four cycle you will have to retime the camshaft. Kip
line up the dots?
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