Flywheel fitting

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Flywheel fitting

Post  MrStationHouse on Thu 27 Mar 2014, 12:58 pm

I am in the process of fitting the flywheel and am interested in others experience. When I fit mine on to the crank it is an easy sliding fit with no persuasion needed. I might have expected it to be tighter. When it is on the crank shaft without the key there is a small amount of wobble.

what has been the experience of others?

With best wishes
Simon

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Re: Flywheel fitting

Post  highpressure on Thu 27 Mar 2014, 1:15 pm

Mine slides on easily, cant say about the wobble, never tried. Once the key is in and a tight fit ( by shimming if nessecary ) it has no issues at all.

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Re: Flywheel fitting

Post  IanL on Thu 27 Mar 2014, 1:59 pm

I have also managed to easliy slide the flywheel on, with the key pushed in about 3/4 of the way, there is a slight amount of slack whilst spinning the crankshaft. As I still need to take it off to fit the gear guard and finish the winch I have not tried it with the key knocked fully home, but think it will be tight

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Re: Flywheel fitting

Post  MrStationHouse on Thu 27 Mar 2014, 2:25 pm

Thanks chaps

best wishes
Simon

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Re: Flywheel fitting

Post  IanL on Thu 18 Sep 2014, 2:22 pm

Well I have now fully inserted the key and there is still a slight movement of the flywheel on the shaft. There is still a small movement between the key and the crankshaft. If I can get the key out a think knocking the bottom of the key with a centre pop may expand the key enough to take up the slight slack. Certainly not enough to shim .

Ian


Last edited by IanL on Fri 19 Sep 2014, 2:05 am; edited 1 time in total (Reason for editing : Spelling)

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Re: Flywheel fitting

Post  iain on Fri 19 Sep 2014, 12:18 am

I would get some engineers blue and see what the fit of the key is like first. May just have a high spot.

I certainly wouldn't centre pop the bottom, you want a good 80% contact of the key to make sure it stays tight.

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Re: Flywheel fitting

Post  Tim Watson on Fri 19 Sep 2014, 4:13 pm

Despite my best endeavours with shims and the like, the flywheel key and hence flywheel tends to work loose on Frederick, especially after generating on the belt and a rough road run. It's important that the key is not driven fully home, leaving space for an extraction wedge to drive it out.

I will be making a brass end cap to solve the problem today. There was a thread on traction talk recently on securing flywheels:
http://www.tractiontalkforum.com/showthread.php?t=12132.

Tim

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Re: Flywheel fitting

Post  Capricorn1 on Sat 20 Sep 2014, 2:02 am

If the key is going in right up to the head, the best option is to make a new key which fits correctly and tried with engineers marking blue, could be seen as a pain in the a----, but the only way to ensure a good fit. If the flywheel is not quite a light push fit then Loctite retaining compound could be used.

http://www.loctite.co.uk/retaining-4479.htm

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Re: Flywheel fitting

Post  Tim Watson on Sat 20 Sep 2014, 2:17 am

I would be very wary of using retaining compound on the flywheel as I have had to remove it quite a few times for access and maintenance.

Tim

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Re: Flywheel fitting

Post  IanL on Sat 20 Sep 2014, 3:57 am

I have not driven the key flush to the flywheel as i had thought it may need to come off and wanted to leave space for a wedge to help remove. The key is tight in the flywheel slot but has a slight amount of movement in the crankshaft slot, I have tried to measure with a feeler guage and it is less than 2 thou, at the rim of the flywheel there is 1mm movement which feels a lot.

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Re: Flywheel fitting

Post  Tim Watson on Sat 20 Sep 2014, 8:09 am

I have made and fitted the brass end cap. Quite a simple job, held in place with a 0BA bolt tapped into the end of the crankshaft.


It also makes the shaft end look much neater and is another bit of brass to polish!



I would go so far as to say that this is a 'must-have' fitting for Tony & Shane!

Tim

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Re: Flywheel fitting

Post  Tony King on Sat 20 Sep 2014, 3:36 pm

Absolutely excellent Tim, I thourouly approve!!


Regards,
Tony

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Re: Flywheel fitting

Post  showman shane on Sun 21 Sep 2014, 10:13 am

Looks great.i will definitely have one on starlight express.

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Re: Flywheel fitting

Post  Brian M on Fri 17 Oct 2014, 1:13 pm

Hi All,

The key supplied by STW was always a poor fit, so I had a Gib-Head key made by Live Steam Models (20). This difference between the two keys are massive.

Now the session is coming to an end the key will be filed to size and knocked in to place. Luckily, I have the support of an engineer who has just completed the restoration of his full size engine to help with the filing Smile

ATB,

Brian

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Re: Flywheel fitting

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