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Old 02-24-2006, 09:21 AM   #13981
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Hi All,

I've just been taking my car apart and I've noticed the layshaft is moving back and forth by about 3mm. This has got me really worried. Can I simply shimm it up to get rid of this slop? I'm mainly worried about the bevel gear meshing. Will this cause too much resistance in the gears or not?


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Old 02-24-2006, 09:27 AM   #13982
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the main driveshaft?
try different sized o-rings in the drive cups.
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Old 02-24-2006, 12:17 PM   #13983
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Quote:
Originally Posted by pwracing
Hi All,

I've just been taking my car apart and I've noticed the layshaft is moving back and forth by about 3mm. This has got me really worried. Can I simply shimm it up to get rid of this slop? I'm mainly worried about the bevel gear meshing. Will this cause too much resistance in the gears or not?


Regards
Paul
Layshaft is commonly refered to in belt cars and input shafts refers shaft cars. Do you mean the rear input shaft by chance? If so 3mm is alot- sounds like an alloy spacer is missing or the bevel screw is loose.
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Old 02-24-2006, 12:20 PM   #13984
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I thought I saw a low profile front shock tower on-line before. If it does exist does someone have a part number for this?
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Old 02-24-2006, 12:43 PM   #13985
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square makes one.... www.rc-mushroom.com has them.

Last edited by karlo511; 02-24-2006 at 01:29 PM.
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Old 02-24-2006, 01:44 PM   #13986
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Nice- thanks!
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Old 02-24-2006, 02:14 PM   #13987
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Quote:
Originally Posted by karlo511
square makes one.... www.rc-mushroom.com has them.
Any idea how much lower it is? The stock unit is just to tall for some of the bodies.
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Old 02-24-2006, 02:25 PM   #13988
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if i remember, about 2mm lower than stock..
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Old 02-25-2006, 06:05 AM   #13989
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Hi all,

OK i made a mistake. It's the input shaft and not the layshaft that is moving. I think 3mm was over the top. It's moving back and forth by about 1mm. I loked at the two bearings on the input shaft behind the spur gear and noticed quite alot of slop. I have always run the 3 shimms as the manual states. I have now upped this to 6 shimms. The slop has now dissappeared, but will this cause excessive resistance in the gearbox?

Paul
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Old 02-25-2006, 08:10 AM   #13990
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Quote:
Originally Posted by pwracing
Hi all,

OK i made a mistake. It's the input shaft and not the layshaft that is moving. I think 3mm was over the top. It's moving back and forth by about 1mm. I loked at the two bearings on the input shaft behind the spur gear and noticed quite alot of slop. I have always run the 3 shimms as the manual states. I have now upped this to 6 shimms. The slop has now dissappeared, but will this cause excessive resistance in the gearbox?

Paul
Adding three more shimms might put stress and resistance to both your gears and bearings. I believe it's normal for the drive shaft to move a bit. Remove one or two shimms and observe your shaft's movement.

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Old 02-25-2006, 03:03 PM   #13991
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Heres the way to shim EVERYTHING on your car.

FEEL you car. haha sounds funny but really, learn what you car feels like before you run it. then feel what it feels like after you run it. you'll soon be able to tell when slop develops or when something just doesnt feel right.

To shim the drivetrain the thing to remember is that you want as little slop as possible but with things as free as possible first. So keep adding shims, one at a time, and moving things until you notice friction. At this point you have at least 1 too many shims. Remove a shim and see how it feels, see if it feels like there is a LITTLE bit of side play. Now try removing one more shim, see if it free's up some, but also if it develops a bunch of slop. The tradeoff here is that a little bit of free-ness isnt worth a bunch of slop.

This goes for everything really...hingepins, kingpin screws, drivetrain shimming, etc.

My money knows that Hara can pick up your car and tell you what to change to make it better, without driving it
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Old 02-25-2006, 08:16 PM   #13992
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finally got to the carpet track tonite to test my mods....everything worked! moving the batts up 1/2 an inch......adding a "spine" to the top deck all made a BIG difference in the car. the thing was almost mod raceable straight off the bench! only two changes were needed and she was right there!
my 10 month old batts couldn't compete with the top guy's 3800's, but only time and $$$ will fix that! ..my TOP stockers wasn't enough for those EPICs eigther.....but i aint NEVER SCURRED!!!
now i can "officially" retire 'ole gurl an fire up the X-ray! outdoor season will be here before you know it!
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Old 02-27-2006, 05:23 AM   #13993
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Don't know if yall saw this or not.

http://cgi.ebay.com/HPI-Pro-4-Damaged-Cheap-Parts-or-Rebuild_W0QQitemZ6039775448QQcategoryZ44015QQrdZ1Q QcmdZViewItem
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Old 02-27-2006, 02:31 PM   #13994
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Well I managed to get rid of that slop I talked about. Got a new input shaft from work and now it's as good as new.

Paul
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Old 02-27-2006, 04:38 PM   #13995
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i bid on the ugly car . wow what a rebuild job.
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