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  70 Bliz 776 Inner Clutch Sheeve Removal
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   Author  Topic: 70 Bliz 776 Inner Clutch Sheeve Removal  (Read 1625 times)
Racecar1k
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70 Bliz 776 Inner Clutch Sheeve Removal
« on: December 2, 2012, 12:45:47 PM »
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Trying to remove the inner sheeve before I talk the engine case apart. It will not break loose!!!!!  I'm ignorant at times but!  I assume it's RH thread and I've had a pretty big pry bar on the end. Should I use heat on the sheeve???  I obviously don't want to F--- it up. Any help would be greatly appreciated. 
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #1 on: December 2, 2012, 02:28:53 PM »
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I'm no expert on this, but I can remember heating non Blizzard inner sheaves to glow red before they would move.
Sometimes it doesn't take that much heat though.
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #2 on: December 2, 2012, 03:45:02 PM »
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Bring it down Gary. I'll help you get it off without bending then crankshaft.  Better yet, bring the whole sled and I'll trade you something else for it.
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Racecar1k
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #3 on: December 4, 2012, 03:45:36 PM »
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Hey Bud is it a right hand thread? Thanks Gary
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #4 on: December 4, 2012, 08:41:58 PM »
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Yes they are normal threads righty-tighty lefty-losey
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Racecar1k
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #5 on: December 5, 2012, 05:55:49 PM »
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A big thanks to Doolittle and his tip to removing the inner sheeve. Your idea worked as you said. Experience is everything. Thanks Bud
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slojoe
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #6 on: December 5, 2012, 07:52:18 PM »
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How were you able to remove it?  I have the same problem with a 335 motor..
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Racecar1k
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #7 on: December 6, 2012, 07:05:48 AM »
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Gotta have a welder. Took a piece of round tubing 1 3/4" long and slipped it over the end of the sheeve and drilled holes through both sides of the tubing to align with the hole in the end of the sheeve. Put a 5/16" bolt through it so it won't turn on the sheeve. Then I welded a piece of flat plate on the end of the tubing and then a 1" nut on the plate. I then used a nice size 1/2" drive impact and it came off easily. You also have to hold the mag end of the crank either with the flywheel or if the flywheel is of use the flywheel nut and a socket with a long breaker bar.
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slojoe
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #8 on: December 7, 2012, 07:28:38 PM »
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Thanks for the reply.  I made a clutch puller sounds like yours except I welded a 1/2" drive socket to the end.  I hit it with a big breaker bar, also an IR superduty impact, no go, any more force and it seems like something would break in the motor.  I tried holding it by the flywheel nut but it just spun off in the same direction??  Here is a pic of my setup...
 
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #9 on: December 7, 2012, 09:34:44 PM »
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slojoe...FYI, that is a excellent way to "BEND" your crank shaft 
If you build a tool like that then use a impact wrench it will not tend to bend crank. But lots of fellas don`t recommend using a impact on a crank
Not a thing wrong with the tool idea you have, but....... You need to build it so the pipe or sleeve goes all the way to the clutch face then use a pipe wrench as close to engine as possible. Or.....use a chunk of square tubing then you can use a open end flat wrench, but still go as close to engine as U can.
Don`t hold on fly wheel nut, that puts all the strees through the crank. Use a rope in cylinder.
Bones
« Last Edit: December 7, 2012, 09:36:33 PM by Bones » Report to moderator Logged
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #10 on: December 8, 2012, 01:13:33 AM »
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I'm with Bones on this one slojoe

I removed inner clutch halfs at first by taking the fan shroud off and jamming a piece of wood between the ring gear and motor mount, my Boss who races carts with rotax motors said not a good idea, could bend the crank, then I mentioned impact gun, again same answer, then I told him about Bones rope down the cylinder trick, he said that was the best way to doo it without much risk of bending cranks, thays because the stroke is at the Top (as close as possible because of the rope) then less stress lateraly (sp) on the offset.
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Racecar1k
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #11 on: December 8, 2012, 08:27:10 AM »
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My problem was the engine was apart when I got it with no pistons. I had no cylinders or pistons in place. What I actually did also besides the breaker bar on the mag nut was this. I placed a piece of aluminum tubing (1/4" wall) thru the top end of the rods that stretched the length of the cases with wood blocks placed under the tubing ends to hold the crank. Basically the same pressure being applied that bones is talking about. The socket and breaker bar on the mag nut was extra insurance. The aluminum rod and one piston rod was actually all that held the pressure. So Bones" suggestion is the right way to do it w/ the rope in the cylinder. However I see no harm in using an impact. 
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #12 on: December 8, 2012, 08:39:18 PM »
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Not sure, maybe I need to clarify my previous post
I doo not mean holding onto the mag end nut willl bend crank.
Holding onto the mag end nut can throw the crank out of phase. Using a impact sends a lot of shock through the crank, cranks are really fairly fragile.
Using a tool as pictured above, then using a mechanical wrench out at the end on the nut is what  "WILL" bend the crank.
Bones
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #13 on: December 8, 2012, 08:53:55 PM »
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I've used impact guns on several stuck clutches in the past. Really stuck, would not come of with all the manual tricks. Impact zipped them off.  Always caused some displacement of the hole in the outer shaft where the socket tool bolts through. A few minutes of filing and the outer half slid on and off as it should
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slojoe
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Re:70 Bliz 776 Inner Clutch Sheeve Removal
« Reply #14 on: January 10, 2013, 01:27:34 PM »
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Thanks everyone for the advice, clutch came off with a pipe wrench near the bearing end... after soaking it for a month then heating with a torch... shaft spins straight... thanks again.... sorry for the hijack
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