Help! Hi Guys i have issues with a Beetle i bought

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adrenalinjunki

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Hi guys i purchased this 2nd hand..

It has everything alloy on it, even new engine mounts..

Right from the start something isnt right here...

Can anyone help me?

Gear Grinding Against Rear Axl

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Close up

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Bent Brace
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should the pinion be this far over?
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48t on the spur and the engine pinion has 16t
 
It could be a couple of things:

1) rear diff mounts are shot and brace- you may need to get new diff mounts and a new brace. The plastic ones wear out after a while and the screws start to move bending the plate

2) Chassis may be bent in the rear. The chassis may be bent upwards from excessive bashing

Also, i see that you have a plastic spur gear carrier, upgrade that to the alloy one. it will save you another headache later.
 
i have also noticed that the lay shaft possibly not setup right.. the pinion on the layshaft doesn't line up with the diff... if i slide the shaft to the left 15mm it will line up with the diff and also move away from the rear arm?
 
you layshaft should not move more than a few mms. Check to make sure the nut that holds the break pad is tight. It may be loose causing the flex.
 
According to the picture the back side of the large motor mount that faces the lay-shaft gear looks like it hits the mount, is that a mark on the mount from the gear hitting it? There should be a shim washer or washers that will not allow the shaft gear to come close to the bearing or mount on the back side. CLICK PHOTO TO ENLARGE:

You also should not be able to move the lay-shaft back and forth much and once you get the alloy spur carrier FG#6439 it wont move at all.
1st thing I would check is that the motor mounts have not moved shifting the whole motor to the left. This will cause the gear to hit the shaft also like you see.
Unloosen the motor mounts and let the spur-shaft gear rest against the diff gear. Now, you can slightly manipulate the gear mesh to get yourself enough room away from the upper A arm shaft. Make sure the gears are set or meshed so that they are as perfect together as possible with a small amount of room between the gears so there is no bind but not to much slop. Use a slim business card and squish it between the diff and spur-shaft gear. Now with your third and fourth hands tighten one of the screws so it doesn't move.:clown:
Use the FG shims #6745 to get the gears to mesh the best possible.
The bend in the plate is not that much and its aluminum - unbend it.
It may of had to be bent for it to fit the hight difference of the alloy mounts.
If its not bent for the mount to fit then heat it, stick it between two pieces of flat wood, and hammer it together. If that doesn't work try two pieces of flat steel.

You have the alloy rear uprights! The next best upgrade to eliminate gear rub - And the only way to eliminate it - is to get yourself a set of alloy risers, FG #7478 seen here - https://www.largescaleforums.com/forum/showpost.php?p=16507&postcount=6
Like these: http://www.rcnutshobbies.com/FG_PARTS_07000_07500-Rear_alloy_upright_lengthening_set_2pcs.html
Made for on road camber they allow off road to raise the shaft and get it out of the way, but you need alloy uprights for them to work, and you have them.
Use a sealant on top of the plate screws to keep them from vibrating out.
Get that horrible KN filter off and go back to the original and get yourself a redneck http://www.davesmotors.com/store/product707.html prefilter to go over! That KN filter will suck deadly crap into your motor. M2C.:)
 
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Its Alive!

Cheers mate,

thats great, on saturday i stripped the whole rear end completely...

I purchased new engine mount washers... none fitted :nono:
i purchased a new lay shaft :)
a new 48 spur :)
a new alloy gear carrier :)

I rebuilt the the layshaft starting from the right hand side as you look from the back.. i slid the c clip on thend i put the alloy gear holder on, the slid it through the break housing, slidiing on the alloy brake disc holder, then sliding through the engine mount with the bearings in. i then slid two washers and the fitted the end spur..:lol:

I then lined up the alloy spur carrier with the new spur on it with the engine pinion.. i then sat the engine on the chassis.. i fitted the new alloy dif support bracket too... i then put the screw in as this is a fixed point so the engine cannot go anywhere.. i then also fitted two engine support screws in with the washers on at diagnals...

i then lined up the rear pinion with the diff and marked the shaft with a pen..

I then removed everything, tightened the pinion and put it back.. but i still only had 3mm clearance.

i noticed though that the rear arms hadn't been setup either.. just wound in as far as possible.. so i wound those out and set the wheels to be true with the front...

:clap::clap::clap::clap::clap::clap::clap::clap::clap::clap::clap::clap::clap:


Now she runs a treat :)

the buggy is full alloy now a single piece of plastic on her... just ordered a new alloy radio tray and all new radio gear! :0)
 
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