511/501x Centre Shaft Bent ? Meshing Noisy

[Rich D]

This doesnt seem right to me guys. This is brand new out of the box. Note the nut on the end of the centre shaft "wobbling".

Have a look at the nut on the end of the shaft and compare it to yours if you can. Im holding the throttle on steady and you can hear the motor revs up and down cos of the mesh tightening and freeing off

Its a brand new Tamiya Spur and new Tamiya pinion.

the fault must be in the shaft itself as the whole assembley moves up and down.

Your thoughts appreciated .....



Also, is it normal for the rear belt ( with the writing on ) to rub on the back of the slipper plate as shown below ? I have double checked the manual and the spur centre section definitely assembled correctly.

[Fredrik Emilsson]

Remove shaft and check.

Is slipper assembled correctly? Check slipper pads are "seated" correctly on spur and plates on the shaft.

[Welshy40]

I did the same thing. Pay attention to the instructions and how the slippers supposed to be built. Either the spring retainers on the wrong way around (the blue thick washer) or the slipper plates need swapping over. Hope that makes sense.

[mole2k]

I found with my 501x that once after a rebuilt I built it up and the whole thing was out of line. stripped it all down to the individual pieces and built it back up and it ran true again.

It must of been something to do with the slipper pads not seating just quite right although I never noticed anything when taking it apart or didn't do anything different in the rebuild.

[T4miy4 Guy]

Hi

It could well be a problem with the slipper not built correctly but from the photo like you say the belts look wrong (as if there pulling ) are the diffs true, sat in true, i have had a similar problem when i was tensioning the belts and my diff`s weren`t running true and square thus pulling everything out and stressing the spur shaft.

Hope this helps

Andy

[AaronR]

Originally Posted by Rich D

Also, is it normal for the rear belt ( with the writing on ) to rub on the back of the slipper plate as shown below ? I have double checked the manual and the spur centre section definitely assembled correctly.

Mine is the same... the rear belt does rub on the slipper plate but I have never seen any fraying of the belt. I don't like it much either, but I do not think it is very serious at all.

[Rich D]

Cheers for the replies lads - good suggestions.

I have rebuilt it and its still the same. It was built fine and the pads were seated fine too as it happens but its what i would of suggested to check.

After running the motor and the spur assembley on their own without either belt connected its apparent that the noise is due to the meshing between the Tamiya pinion and the Tamiya Spur. They do not mesh very well at all when held up to the light. This may be due to a slightly badly moulded spur or slight damage caused by running it on the bench with the bent centre shaft.

Anyway, i have ordered a new centre shaft, a B44 spur and some different pinions to try. It would probably work fine as it is in truth but i cant live with that noise. Im used to 64p whisper quiet.

I have cured the rear belt rubbing on the back of the slipper plate by fitting 4 of 4x 0.2 shims instead of the manual recommended 2 of 4x 0.2. It takes the play out and pushes the whole assembley towards the speedo by a fraction so it clears.

Thanks again for the input guys.

[simoncrabb]

Them Tamiya spurs are rubbish, I've swapped to RW ones, and they are really nice, much quieter mesh now...

Recommended

[DCM]

Tamiya spurs are really noisey, AE ones on mine.

[Rich D]

Aha !

i thought as much - wish id of known all this before ordering spares.

Thanks guys.

[Smartalec]

Richard, I had the same thing when I built my 511. The layshaft looked badly out of alignment but on taking it apart and looking closely there is a way round to install the pulley parts. I can't quite remember exactly what it was but I remember it's not clear in the instructions and there is a definite method of the pulley going together that cures the problem totally. It's the only part of the instructions that's not clear

[Rich D]

Originally Posted by Smartalec

Richard, I had the same thing when I built my 511. The layshaft looked badly out of alignment but on taking it apart and looking closely there is a way round to install the pulley parts. I can't quite remember exactly what it was but I remember it's not clear in the instructions and there is a definite method of the pulley going together that cures the problem totally. It's the only part of the instructions that's not clear

Hi Alec

Thanks for the input. Im certainly not disputing what you are telling me dude but i studied these instructions with meticulous detail and couldn`t see any other way for the spur assembley to go together.

Page 5 of the instructions, the BA22 slipper plates and BA23 pads are identical, as are the BA16 slipper spacers.

The BA21 18T pullies im assuming are the same but i must admit i didnt study those closely due to them having the same part number and being labelled BA21 x2

I`ll go and check those again now

Ive installed those with the flanges as per the manual too

After that, there are two identical bearings and a few shims that i have checked are correct.

If you can rack your brains as to what it was that was wrong then id appreciate it !

The manual is here if it helps

http://www.tamiyausa.com/pdf/manuals/42139ml.pdf

Cheers mate

[Smartalec]

I've just had a word with Paul Upton who was at my place when I was building that part and we both seem to think that it was something to do with the way part number BA21 (pulley) goes together. My memory is terrible but i'm sure if you examine those two parts very closely (VERY) there is a way of alligning them correctly. As I said before, I didn't have a clue why mine wasn't right until I took it all apart and inspected it ...... it's like a chinese puzzle LOL ....... let me know when you find it

[Rich D]

You may be onto something mate.

Although the pulleys are identical, you can rotate them to either align or be offset. As you said, this isn`t made clear in the instructions. I cant see how it would make the layshaft appear to be bent but i will reassemble it with them aligned this time and see what happens !

Im waiting for a RW spur to arrive first though

Thanks again you`ve been a big help as i honestly overlooked that. No mention of this at all in the manual !

Im sure there must be other 511 owners on here who havent noticed this too so maybe it will help others ....

As it was .....



As it is now after rotating the pulley nearest the threads by one notch on the splines ..... ( certainly looks better anyway :s )

[GRIFF55]

I built mine in line rich and have had no probs with the tamiya spurs and pinions?? I know a few who have had spur problems and running the ae ones cured the noise issue
As for the belt rubbing on the rear of the slipper plate, i have this and there has been no probs at all, AWESOME CAR!!!!!

keep us informed, have you changed the std silver ball studs too? (bit soft)

[Rich D]

Originally Posted by GRIFF55

I built mine in line rich and have had no probs with the tamiya spurs and pinions?? I know a few who have had spur problems and running the ae ones cured the noise issue
As for the belt rubbing on the rear of the slipper plate, i have this and there has been no probs at all, AWESOME CAR!!!!!

keep us informed, have you changed the std silver ball studs too? (bit soft)

Hi mate

Thanks for the input. Good to know that the 511 guys all help each other. I have got plenty of 511 spares here if any of you guys need something quickly anyway. Good to help each other out

My mate in Austria ( Muratti on here ) has had the same layshaft issues with his DB01R and decided to change his for a replacement today. He says it cured it so i suspect that mine is indeed slightly bent too.

I cant see how running the pulleys not aligned can cause this wobbling issue but i may be wrong!!

Yes, i binned the lot of the long silver studs

I have got a mixture of the hard Tamiya type to replace the long ones and 3Racing titanium ones to replace the shorter studs too.

I was expecting them to come as per the 416x in blue aluminium. Had i of known that they would be steel i probably wouldnt of bothered in retrospect.

As for some having Tamiya Spur/ pinion problems and not others.... When the shit hits the fan, its pretty much guaranteed that i`ll be stood in front of it.

[mattybucks]

Maybe is a balance issue?

[dimblum]

I haven't seen any posts mentioning this yet, but the wobble shown in your video might only be related to the positioning of the slipper clutch spring..

I was able to duplicate this issue with my DB-01 when I first built the slipper assembly. I did not center the spring on the layshaft correctly which caused an artificial wobble effect (it also put uneven pressure on the nylock nut which enhanced the effect).

All problems were solved after holding the spring in-line with the nylock nut while I tightened them down.

[Rich D]

Originally Posted by GRIFF55

I built mine in line rich and have had no probs with the tamiya spurs and pinions?? I know a few who have had spur problems and running the ae ones cured the noise issue
As for the belt rubbing on the rear of the slipper plate, i have this and there has been no probs at all, AWESOME CAR!!!!!

keep us informed, have you changed the std silver ball studs too? (bit soft)

The problem was with a dodgy spur in the end guys, fitted an AE one and the shaft wobble has disappeared.

Thanks again to all for the input

[Welshy40]

Guys,

My slipper layshaft has bent as well. Where do I get a new one from?