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joeing701(at)simnet.is
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 Posted: Wed Feb 12, 2014 11:47 am Post subject: Refitting the fly wheel |
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Hello Rotax owners.
I am about to re-fit the fly wheel on my Rotax 912 uls engine after installing a new stator assy.
The heavy maintenance manual states that it should be tightened to 45 Nm + 180 deg. Angle to rotation. This should be around 1062 in/pounds. This is a lot for only one stop bolt on the crankshaft. Will this procedure be safe for the crankshaft not to twist under all this force?
Regards,
Johann G.
Sent from my iPad
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Feb 12, 2014 4:39 pm Post subject: Re: Refitting the fly wheel |
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This is about 88 ft/lbs. The one on the PTO side inside the gearbox gets around 149 ft/lbs. It isn't so bad when you compare. 45nm is 398 in/lbs or 33 ft/lbs. I'm not 100% sure what the extra 180 degree turn would yield, but is common on head bolts and the like to apply a certain torque followed by a certain amount of degree turn.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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joeing701(at)simnet.is
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| Posted: Thu Feb 13, 2014 10:49 am Post subject: Refitting the fly wheel |
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Thank you again, Roger, for you help. It was not as extreme as I had thought when I had the right tool. Flywheel torqued according to the manual.
Best regards,
Johann G.
On 13.2.2014, at 00:39, Roger Lee <ssadiver1(at)yahoo.com> wrote:
| Quote: |
This is about 88 ft/lbs. The one on the PTO side inside the gearbox gets around 149 ft/lbs. It isn't so bad when you compare. 45nm is 398 in/lbs or 33 ft/lbs. I'm not 100% sure what the extra 180 degree turn would yield, but is common on head bolts and the like to apply a certain torque followed by a certain amount of degree turn.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=418638#418638
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