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Saito 220 Bent Crank by 0.030 inches

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Saito 220 Bent Crank by 0.030 inches

Old 08-13-2006, 08:58 PM
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Default Saito 220 Bent Crank by 0.030 inches

I figured I might as well post this here too (as in the engine section). My Saito 220 has a mangled crank (from a nose in on grass) that, after checking it with a Dial indicator, shows that run-out is out by 0.030 inches. It is not perceptable to the naked eye. I discovered this after putting a new prop on and noticed that it was out of square to the rear thrust washer (drive washer???).

I could pull the crank and maybe straighten it at a machine shop or just buy a new one for $120, or, maybe 0.030 isn't enough to worry about??? Vibration is the primary concern, obviously.

MPB
Old 08-13-2006, 09:25 PM
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Default RE: Saito 220 Bent Crank by 0.030 inches

Thirty thousandths is way too much run out. Even .003 is marginal. I would exercise one of the two options that you mentioned. If it is not perceptible then you might want to double check your reading as .030 is two thousandths shy og 1/32 of an inch.
Good luck with your repair.
ORIGINAL: shag555

I figured I might as well post this here too (as in the engine section). My Saito 220 has a mangled crank (from a nose in on grass) that, after checking it with a Dial indicator, shows that run-out is out by 0.030 inches. It is not perceptable to the naked eye. I discovered this after putting a new prop on and noticed that it was out of square to the rear thrust washer (drive washer???).

I could pull the crank and maybe straighten it at a machine shop or just buy a new one for $120, or, maybe 0.030 isn't enough to worry about??? Vibration is the primary concern, obviously.

MPB
Old 08-13-2006, 09:34 PM
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Default RE: Saito 220 Bent Crank by 0.030 inches

That's what I figured... Iguess I'm doen on delays for another couple of weeks. Guess I'll just order a new crank rather than shake the airframe apart, amongst other things.

MPB
Old 08-14-2006, 12:02 PM
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Default RE: Saito 220 Bent Crank by 0.030 inches

a very wise move,will save you money in the long run.
Old 08-14-2006, 01:28 PM
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Default RE: Saito 220 Bent Crank by 0.030 inches

New crank on the way. I guess in the interim I can get all the other things done and ready to put it in the air!

MPB
Old 08-15-2006, 01:33 PM
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Default RE: Saito 220 Bent Crank by 0.030 inches

If you can cancel the order on the crank, send it in to Horizon for repair. They have a very liberal repair policy- I'll let you figure out the meaning behind that.
Old 08-15-2006, 03:03 PM
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Default RE: Saito 220 Bent Crank by 0.030 inches

Hmm... I was worried that it would be the exact opposite and cost me a fortune to repair through them. I guess I've bought enough JR, Saito, and H-9 stuff from them over the past two years to warrant a NEW FOC engine. Unfortunately for me, I've already stripped this pup down so I'll just eat it. It was my fault, after all.

Man, I was really suprised by the amount of force needed to pull the prop hub from the crank... Then all at once is "popped" off. It's got one of those "press-fit" wedges. Are all saitos built like this??? I haven't looked at my 72 to determine this.

MPB

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