Author Topic: Ew350 gearbox fixing  (Read 412 times)

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Offline Neilj

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Ew350 gearbox fixing
« on: 30 May 2021 at 17:24 »
Sorting all my boxes that make up a ew350 hopefully.Does anyone know what size and thread are the bolts that hold the gearbox to the frame please.

Offline EW-Ron

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Re: Ew350 gearbox fixing
« Reply #1 on: 01 Jun 2021 at 00:23 »
I was just looking into that, having sourced a better gearbox.

They are 3/8"  diam and 1 & 7/16" long and 20 tpi.
That should correspond to BSF. ?
(unless its coarse cycle thread 20 tpi, although BSF nuts fit, if a little rough)

Its stamped DK on the head, although stamping is a little unclear,  unless you have it correctly orientated.
Looks like they need washers, although these were fitted without.





Offline Neilj

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Re: Ew350 gearbox fixing
« Reply #2 on: 01 Jun 2021 at 08:46 »
Thanks measure my frame bracket at 1 inch that only leaves 7/16 without a washer in the gearbox.Stuck a bit of wire in the gearbox thread and thatís an inch deep recon you could use 1 1/2 or even 1 3/4 with a washer👍

Offline EW-Ron

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Re: Ew350 gearbox fixing
« Reply #3 on: 01 Jun 2021 at 21:49 »
These bolts seem reluctant to go in to their full 1" length of thread.
I need to look into this.

If they didn't have that DK stamped on their head I'd have thought that maybe
they weren't quite correct in some way ...

You wouldn't want them to bottom out though, thats a recipe for breaking something ?

Online cardan

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Re: Ew350 gearbox fixing
« Reply #4 on: 02 Jun 2021 at 02:03 »
99% of applications like this would use studs screwed (once) into the alloy casing, then nuts to fasten the gearbox in place. Did the EW really use bolts?

Leon

Offline EW-Ron

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Re: Ew350 gearbox fixing
« Reply #5 on: 02 Jun 2021 at 02:34 »
Don't know.

My EW came with bolts, with DK stamped into the heads of them.
And the spare gearbox I bought came with nothing.
And another stray box I've sighted had nothing.
And the OP here doesn't have studs.

So I'd say we are coming to a consensus here.

All that I've seen appeared to have a few problems with the threads.
And the reason that most makers fitted studs !!?

I'll contemplate if the gearbox could actually be removed if studs were fitted,
they'd be pretty long-ish and there is not a lot of room above ?

Offline Neilj

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Re: Ew350 gearbox fixing
« Reply #6 on: 02 Jun 2021 at 05:49 »
Funny got a copy of the ew350 parts book in gearbox it lists studs and nuts with no size.you ever taken a gearbox apart to put new bearings in? Took the side plate off mine the kick start arm flew around and what a mess inside 90 odd year burnt grease and a few bits of what look like broken plastic.mine is marked DD low ratio for competition apparently.

Offline EW-Ron

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Re: Ew350 gearbox fixing
« Reply #7 on: 02 Jun 2021 at 06:31 »
Funny got a copy of the ew350 parts book

Aha ! Solves that then.
I've been searching for that for a while now, last seen about 3 house moves ago.

I have had the box apart, don't recall the finer detail.
Kick start springs are always a challenge.
This new box will need inspecting, if nothing else.
Aside from actually finding/making some studs.

Is liquid grease the recommended lubricant. ?
Is just the end cover enamelled black ?

Offline Doug

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Re: Ew350 gearbox fixing
« Reply #8 on: 02 Jun 2021 at 14:17 »
The 350EW gearbox went through at least three iterations. The first mounted on a flat platform and the case has four individual column legs. The next version jointed the columns on each side into a pair of mounting curbs. In 1927 the frame was altered and the transmission had a plate anchorage that clasped the frame tubes. The spares list I have dates March 1927 and covers the plate anchorage style. That uses bolts (#7741-2). Maybe the earlier style used studs and nut? However the -2 suffix to the part number indicates that the bolt has already gone through two revisions.

-Doug

Offline Neilj

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Re: Ew350 gearbox fixing
« Reply #9 on: 02 Jun 2021 at 17:51 »
Looked up the grease and itís fairly widely available on eBay and yes as far as I can see only the end plate was black.i painted mine with satin heat resistant looks ok,but it might look nice in high gloss??.If anyone has photo,s of the internals of a gearbox whilst coming apart or drawings this would help.mine has 2 parallel posts for fixing.

Offline Doug

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Re: Ew350 gearbox fixing
« Reply #10 on: 02 Jun 2021 at 18:58 »
Only pic I have is this one of a 600EW (actually F28). Very similar to the 350 EW and I think share some components in common. Longer main shaft however to suit the larger offset for the primary chain.



The combined main shaft, lay shaft, and shifting glut come out together. May need to warm the cases to release the grip on the ball bearing races.

-Doug

Offline Odd Bob 66

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Re: Ew350 gearbox fixing
« Reply #11 on: 02 Jun 2021 at 20:20 »
Mine has the second style of mounting, bolts up through the frame with the mounting bosses joined as two pairs. Definitely bolts, not studs. First reg'd Jan '27, but wouldn't know manufacture date. I would guess late '26 for the '27 season. It has the later two-pipe oil pump set-up. (Thanks Doug, your article on the pump was very helpful!)

Cheer, Paul.

Offline EW-Ron

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Re: Ew350 gearbox fixing
« Reply #12 on: 02 Jun 2021 at 23:44 »
However the -2 suffix to the part number indicates that the bolt has already gone through two revisions.

Could the 2nd version have just been bolts instead of the studs, we wonder ?
I've just seen too many boxes without any studs.
And they're not the sort of thing you'd just remove ??