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Schumacher Mi4

Old 03-14-2011, 12:00 PM
  #2566  
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Originally Posted by skypilot View Post
The instructions for the way the layshaft is different between the lp and cx. Little space washer goes on the screw head side of the shaft on the cx. Perhaps this is the issue.
There is only one spacer on the LP, and that sits in the Spur Gear side which ever way you have it around.
I found using the option 1 set up that the spur had movement causing it to strip under load and make a noise. Moving the bolt to the other side removed that play and the noise.

Just looked up the CX manual online and the layshaft set ups are the same, spacer in the spur gear side.
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Old 03-14-2011, 01:01 PM
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Thanks guys, will give those ideas a go...
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Old 03-14-2011, 08:52 PM
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Originally Posted by NiMo View Post
There is only one spacer on the LP, and that sits in the Spur Gear side which ever way you have it around.
I found using the option 1 set up that the spur had movement causing it to strip under load and make a noise. Moving the bolt to the other side removed that play and the noise.

Just looked up the CX manual online and the layshaft set ups are the same, spacer in the spur gear side.
you are correct, I built the lp with option 2 and the cx with option 1 thats why i found a difference. my mistake.
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Old 03-14-2011, 11:01 PM
  #2569  
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hello..

anyone have a good start setup for carpet and for asphalt?
i run modifed indorr and door.
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Old 03-15-2011, 05:17 AM
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Originally Posted by NiMo View Post
The one thing I done (which is not in the manual) is to insert the layshaft bolt from the opposite side to the motor mount.
I did this as I found the spur had too much play when set up as manual.
It also makes the car a little quieter.
This is on LP, but should be same on CX.
(use as manual, just put bolt in from other side, and locker in other side, all spacers stay as before).
Thanks for your input every, I will try a few of these ideas. The opposite side thing could work. Cheers
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Old 03-15-2011, 06:37 AM
  #2571  
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Originally Posted by NiMo View Post
There is only one spacer on the LP, and that sits in the Spur Gear side which ever way you have it around.
I found using the option 1 set up that the spur had movement causing it to strip under load and make a noise. Moving the bolt to the other side removed that play and the noise.

Just looked up the CX manual online and the layshaft set ups are the same, spacer in the spur gear side.
From a technical point of view, the play will always be the same, no matter what option you use. The length of the layshaft won't change between Option 1 or 2. And as the build-up with shims and spaces stays the same, there should be no side-to-side play difference between Option 1 or 2.

Personally I prefer Option 2 (spur at motor side), this way the spur and pinion are mounted on the same structure and chassis flex will not influence gear meshing.

Rgds,
Jonathan.
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Old 03-15-2011, 07:26 AM
  #2572  
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Originally Posted by Jonathan P. View Post
From a technical point of view, the play will always be the same, no matter what option you use. The length of the layshaft won't change between Option 1 or 2. And as the build-up with shims and spaces stays the same, there should be no side-to-side play difference between Option 1 or 2.

Personally I prefer Option 2 (spur at motor side), this way the spur and pinion are mounted on the same structure and chassis flex will not influence gear meshing.

Rgds,
Jonathan.
You have obviously mis read my post.
Option one and built as manual leave the spur at the end of the bolt, and it moves.
Moving the bolt to other side places the spur near the start of the bolt, like it is when you run option two built as manual, doing this removes the flex.

I stripped 3 spur gears running option one as manual, even when it (in my opinion) was meshed too tight, since placing bolt the other side I have yet to loose a tooth, and I am meshing less tightly too.
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Old 03-15-2011, 11:42 AM
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Originally Posted by NiMo View Post
You have obviously mis read my post.
Option one and built as manual leave the spur at the end of the bolt, and it moves.
Moving the bolt to other side places the spur near the start of the bolt, like it is when you run option two built as manual, doing this removes the flex.

I stripped 3 spur gears running option one as manual, even when it (in my opinion) was meshed too tight, since placing bolt the other side I have yet to loose a tooth, and I am meshing less tightly too.
What side are you running the bolt now? When not stripping any teeth.
What's the difference in side-to-side play?
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Old 03-15-2011, 12:03 PM
  #2574  
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No difference in side play.
bolt is using the OTHER layshaft mount, the one the motor mount is NOT connected to, the one on the Battery side.
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Old 03-16-2011, 02:32 AM
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side play can be eliminated by placing the appropriate amount of shims on the screw side, not the main shaft side. I have my spur on the battery side and the main shaft goes in from the battery side too. Have not had any spur problems to date running boosted 6.5T.
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Old 03-16-2011, 01:14 PM
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Is the stripping problem with 48p or 64p?

With 17.5, I noticed that my layshaft deflects quite a bit under accelleration, on the bench at least. But I've never had any stripping problems. I've always run 48p, never tried 64p.

You could always try the 2-sided layshaft from the Mi4.

-Mike
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Old 03-16-2011, 01:44 PM
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Like Shev I stripped 6 spir gears in one night!!!!!!!could not find anything wrong,so went back to spur on motor side,no more stripped spurs.I would have to agree with the idea of putting the lay shaft bolt in from the battery side,makes sense...should be in the manual.
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Old 03-16-2011, 02:13 PM
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I've been running my spur and shaft on the motor side for over a year with no problems at all. It's even the same spur that's been on there from the Mi3 days two years ago. 64 pitch also, even on asphalt tracks. I would check the screws that hold the gear on to the pulley and make sure that they are not warping the gear at all. I have seen some wobble if the aren't on straight.
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Old 03-16-2011, 07:45 PM
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Any "TEAM" drivers coming to carpet Nats?
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Old 03-17-2011, 03:41 PM
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Want to congradulate Chris Grainger for resigning with Schumacher. Chris is one of the reasons why I switched to Schumacher. I agree with you Chris on there effort to be the leader and not the follower. Good luck in your next two years....Kurly
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