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stephend
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« on: June 29, 2009, 08:09:08 AM » |
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Sorry for the potentially silly question, but I need to remove the flywheel from my petter style generator. It seems to be held in place by a key, no nut or bolt in sight. Do I simply pull the key out? It has a notch in it that will let me wedge something behind it and pull it out following the direction of the crank shaft. I tried with a pair of pliers and it wouldn't budge - is it safe to use a longer lever and pull it out like this?
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guydewdney
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« Reply #1 on: June 29, 2009, 08:22:38 AM » |
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look for GIB KEY puller
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stephend
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« Reply #2 on: June 29, 2009, 08:33:53 AM » |
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guydewdney
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« Reply #3 on: June 29, 2009, 10:08:17 PM » |
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stephend
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« Reply #4 on: July 01, 2009, 05:34:30 PM » |
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AHA! I've found the guy responsible for my troubles, you can see his handywork at the 1 minute 30 second mark of this video: http://video.google.co.uk/videoplay?docid=3893489674092444780Despite having a fair few problems with the genset it does have a certain charm about it..., ahhhhh India....  |
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AlanM
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« Reply #5 on: July 01, 2009, 06:54:47 PM » |
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Even with the gibkey you may find it much easier to use a set of pullers to remove it. they are useful as they exert an even pressure. You might need them to pull the flywheel as well if it is a tight fit
Alan
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stephend
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« Reply #6 on: July 03, 2009, 08:44:55 PM » |
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The gib key puller worked well, so well in fact that it ripped the end off the gib key. I did try to maintain an even pressure on the puller and tightened each of the screwes in turn, but that didn't help.
Guy with sledge hammer: 1 Stephend: 0
I don't have any welding equipment, so is my next option to drill out the key?
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knighty
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« Reply #7 on: July 03, 2009, 09:22:05 PM » |
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hmmm, is there any access (at all) from behind ? have you tried knocking the wheel further onto the shaft ? (better if you can jam something in behind to stop the key moving too) drilling it out will be a hell of a job.... best you can hope for is to drill it out and soften it up a bit so it's not in so tight.... and then knock/pull it out.... the only problem being once you've drilled it out it'll be that much harder to knock/pull it  it's hard to say without being able to see it.... |
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stephend
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« Reply #8 on: July 03, 2009, 09:37:02 PM » |
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No access behind it whatsoever. The flywheel is inside a housing so I can't get behind it at all. I could saw a groove into it, then modify the key puller to fit into said groove and give it another try. The bit of the key protruding above the shaft is about 7mm high.
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knighty
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« Reply #9 on: July 03, 2009, 10:16:46 PM » |
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hmmm... I'd be tempted to eather saw a groove into the top (not too much, don't want to make it worse) and then jam a small chunk of metal into that with it's toher end hitting the flywheel - at quit a low angle so it's almost flat against the shaft.... then you can hammer this chunk of metal down (with another bar) and it will push out on the key... once it moves a bit your bit of betal wly lie flat on the shaft.... so you knock it out and get a bigger one... and repeate :-) (give me a min and I'll draw a (quick) picture) EDIT:  this way you're knocking the key in exactly the spot it needs to be hit, and in exactly the right direction (notice the drownd down end on the bit of bar at an angle, to fit right into the grove you'll need to cut once you get it moving a bit... you can try easier methods :-) if that doesen't work... drill it out like you said.... but then tap it out and screw a stainless steel bolt into it and try to pull it out using that... probably with a claw hammer? did it move at all with the pluuer ? |
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« Last Edit: July 03, 2009, 10:25:49 PM by knighty »
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Amy
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« Reply #10 on: July 03, 2009, 10:21:01 PM » |
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Try using a key drift once you cut a new head on the key
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wookey
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« Reply #11 on: July 03, 2009, 11:37:56 PM » |
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Tricky one that.
Squirt some plus-gas along the key before starting? That may help reduce the initial static friction. Maybe you already did that?
I think I'd try putting a long tap into the key itself, then construct a puller. But to be honest if the proper puller just broke the end off you could be in trouble. You really do need to get the flywheel off, I presume?
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Wookey
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knighty
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« Reply #12 on: July 04, 2009, 12:49:02 AM » |
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ohh, should have sair earlier... do you have access to heat ? (lots anf lots of heat?)
you really need a oxyacetylene torch ... but I guess a couple or blow tourches would do if you're ok sitting there for 20min while it heats up !
EDIT: actually... because of the mass of the flywheel nonthing short of a wealding torch will do to heat it... and ene then it will struggle...
(it's getting late, brain now working!)
if you can knock the wheel back, even just slightly, it should be enough to get you started....
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« Last Edit: July 04, 2009, 12:54:25 AM by knighty »
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oliver90owner
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« Reply #13 on: July 04, 2009, 06:19:43 AM » |
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If they are a problem like that I drill them. Not too difficult if you get it right. Can be a mess if the drill wanders - it will cut cast iron in preference to key steel if you try drilling with the wrong size pilot, easy to break a small drill bit, etc, etc. Just remember that is a tapered key in a tapered slot....
The crawler tractor guys remove master links from their tracks by burning a hole into the pin and when it cools it will almost fall out. May be able to drill a small hole and then try that trick. At times I would have done, but don't have oxy-acetylene which is the best gas for this job, so I drill.
Regards, RAB
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stephend
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« Reply #14 on: July 04, 2009, 01:56:55 PM » |
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Many thanks all! I have limited access to tools, no heat, no welder and no electricity if the genny isn't running  The reason for getting the wheel off in the first place is to chase down an oil leak which I suspect is at the seal between the crankshaft and the engine block, but given the amount of effort it's likely to take to get the broken gib out, I'm going to wait a bit and see how the leak progresses. Will definitely be keeping an eye on the oil level and the engine does have low oil protection - so will leave it as is until it's leaking too much and then tackle this problem again  Thanks again for the all the tips! |
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