C4.1 build.... layshaft fouling gearbox

[Chrislong]

Hi Guys,
Ive fitted layshaft as described, ensuring the bearings are pressed in to location using a bearing press. Bearing roll freely in location - check.

Using the supplied spacer, and all 4 shims, the layshaft has a small amount of end float within the two halves.

Pair up the gearbox halfs, no other gears in location - only the layshaft, and it is very tight to roll. Upon close inspection I can see the layshaft teeth are fouling the internal of the gearbox.

Iv quickly run around the edges with a scalpal to remove any moulding bur, there isn't any anyway. No better. The fouling is significant, before I have even put any screws through - btw, just realised, no screws... (do I use the B4 gearbox screws?)

I plan to scrape away some internal material in the morning when im feeling a bit fresher. Im used to this, afterall I did plenty of this in the early stages of X-6 prototype running.

Anybody else suffering the same issue? How have you fixed it? Is it going to be dealt with by CML for future batches - or updated parts for those suffering with batch #1?

Looks good so far otherwise in all other respects. Looking forward to running it :woot:

Cheers
Chris

[westie]

All i used on mine was the one spacer sanded down a little, runs as free as a b4 trans.

[Chrislong]

Its not a spacing issue, its the gear teeth fouling the internal of the gearbox casing.

[westie]

Its not a spacing issue, its the gear teeth fouling the internal of the gearbox casing.

Ah right, is it a b4.1 layshaft or b4 maybe some difference there maybe?

[Chrislong]

B4.1. The donor car is newish - used 5 times.

[westie]

Perhaps you have a dodgy one dude, ye olde dremel will sort it im sure.

[Crash]

I'm having exactly the same issue using a B4 layshaft. You can feel the gear teeth scraping the inside of the gearbox housing and is extremely hard to turn with or without the shims.

[Chrislong]

Yup cheers Westie, looking that way. Its significantly fouling, i can just about turn the layshaft and can count the teeth when it turns. Not usable in current condition so itll get modified tomorrow. No worries doing it, im suprised im the only one though.

[Dudders]

Ok this end, seems like the easiest bit lol.

Screws are being sent out, speak with Wes at CML

[Gaz_Stanton]

Mine is fine with B4.1 layshaft. Built as manual.
Use B4.1 gearbox screws Chris.

[Chrislong]

Ofcause, built as manual, no other way :eh?:

I can do this stuff, im just sharing my finds here.

Gearbox sorted, took me longer to fit the tool to the dremel than to fix the gearbox. Its that easy. Lucky nobody else having same issue then? But if anybody is, I don't mind fixing trackside at Chadderton, I'll bring the dremel.

Pictures: +picture of dremel tool used.
29993
29994

[Crash]

Thanks for the pics Chris, I'll be getting my dremel out later today for the same task.
Ah the joy of the first batch - still love it though.

[Chrislong]

No probs mate, rolls very nicely now!

[Gaz_Stanton]

Ofcause, built as manual, no other way :eh?:

Sorry Chris, I meant I hadn't done anything different and mine was fine.
Just wait until you get it on track. Loving it from first run last night! :thumbsup::wub

[Chrislong]

No worries Gaz :) im looking forward to thrashing it around a track :thumbsup:

[Body Paint]

They must have sent you a special one Chris :)

Though I have to say I hope I never have to remove one of the bearings, I'd be amazed if they will ever come out.

[Chrislong]

LOL, yes agreed Craig, very tight. Thats why I used a press tool to make sure they are well seated. Imagine rubbing the shim down, only to find you didn't need to as bearings weren't in fully. haha.

[Chrislong]

Dremel already in my toolbox, anybody need this doing at Chadderton see me next week.. or wishbone dremelling for driveshaft clearance...

[blue_pinky]

So having built mine I made another observation with the layshaft fitting...

If you take just the layshaft and a bearing...and slide the bearing over the short stub on the layshaft you'll see that the stub shaft on the layshaft is longer than the width of the bearing.

When you assemble the two halves together and close it shut this tiny bit of shaft that sticks out then rubs on the bottom of the flat bottomed bearing pocket in the casing...making the shaft bind tightly.

Seeing there is plenty of wall thickness in this area, I very carefully took a drill to the case and drilled a small countersink (it could really do with being a flat bottomed counterbore....but I don't have any tools that would do that) into the middle of the flat at the bottom of the bearing pocket...giving the end of the shaft it's own pocket to go when it sticks through.

Then when you sand down the spacer as per the instructions you only need to just sand it a tiny tiny amount, if at all...just to loosen the fit a touch...literally just a few slides over the paper is needed to make sure it's completely free spinning.

Result...layshaft with negligible float that does not bind! :thumbsup:

Note to CML...gearbox could really do with that extra pocket adding in to the machining, like the B4 gearbox has...just to make sure the shaft (and inner bearing ring) can spin in free air when it's assembled :)

[carpenterdean]

I did not have any issues with my gear box / layshaft, how come some are problematic and some aren't?

[Stuweatherman]

how come some are problematic and some aren't?

Because each one is individually made and not produced from a mould like any other ae would be, as I found out from Wes the other day. Which means there could be a small number that vary.

[chris68nufc]

Has anybody had a problem with the layshaft wobbling when the gearbox is built? I've put the spur on the layshaft
and it's all over the place?

[jampat2004]

Has anybody had a problem with the layshaft wobbling when the gearbox is built? I've put the spur on the layshaft
and it's all over the place?
yes i experiened the same problem,just mess about swapping the slipper plates around and make sure the slipper pads are located properly
took a few goes and is a bit fiddly.
i found that doing this sorted mine out and the spur runs true not all wobbly.:thumbsup:

[mistkerl]

Ofcause, built as manual, no other way :eh?:

I can do this stuff, im just sharing my finds here.

Gearbox sorted, took me longer to fit the tool to the dremel than to fix the gearbox. Its that easy. Lucky nobody else having same issue then? But if anybody is, I don't mind fixing trackside at Chadderton, I'll bring the dremel.

Pictures: +picture of dremel tool used.
29993
29994

Hello from Germany!

I had exactly the same problem. After some Dremel action everything works fine. The build quality of the car is good, but not brilliant :).
The Lipo holder is approximately 0,7 mm from the chassi. I extended the holes with the dremel, so I can move the lipo holder to the inside of the car.

Do you have the same problems?

Viele Grüße, Jens

[crewdy]

My layshaft was touching the inside of the gearbox also exactly as described in this thread. But a vey small amount of the gearbox removed with the dremel and all runnnin perfect now. Car looks great.:thumbsup:

[Chrislong]

The Lipo holder is approximately 0,7 mm from the chassi. I extended the holes with the dremel, so I can move the lipo holder to the inside of the car.

Do you have the same problems?

Viele Grüße, Jens

Hi Jens,
No I had no issues with the Lipo holder. Please show some photos. If you are concerned email Wes at CML and he will help you. :thumbsup:

[JustARcFan]

I had the same "problems".

On 1 side the lipo holder was +/- 1mm to wide and some dremel action was needed in the gearbox to make it smooth.
Nothing major so all is good now.

Very nice looking car!

Hello from Germany!

I had exactly the same problem. After some Dremel action everything works fine. The build quality of the car is good, but not brilliant :).
The Lipo holder is approximately 0,7 mm from the chassi. I extended the holes with the dremel, so I can move the lipo holder to the inside of the car.

Do you have the same problems?

Viele Grüße, Jens

[Chunkton]

Hi,
I have also had the layshaft gear fault with the teeth touching the case, also i have no layshaft spacer so the gear rubs on the inner case, not to mention the trouble of converting the B4 diff outdrives and bearings. Still waiting on a reply from CML. Starting to think i should have spent my money elsewhere, vega maybe, :(

[andys]

Drop an email to CML, they were superb in helping with the problems with mine.

I got the out drives from my LHS, the diff bearings though I got from rc bearings.co.uk for a few quid as no-where else had them in stock. Ordered, and they arrived the next day :)

[wezzer]

hi
due to the christmas break your e-mail may have not been answered , but as normal service has now resumed please drop me an e-mail on wes@cmldistribution.co.uk and i will do all i can to resolve any issues your having.