MV Tooth Extraction, at Weare Rally - Transmission Problems

[Phil Waterman]

Hi All

Well today got back to working in the shop, and the project was to press apart the lower cluster to replace the gear with broken tooth. I had some real concern about how difficult it was going to be to press off the 3 different gears and spacers on the lower cluster. There is nothing in any of my manuals about replacing these gears, yet it must have been common because I have found NOS individual replacement gears. The gears appeared to be a press fit on the cluster shaft with 4 pins running down the shaft in groves, with each of the gears having matching groves. My fear had been that these gears were shrunk onto the shaft.

To make the discription to follow here is the exploded parts view.


The first photo shows my simple bearing press unit nothing fancy I've used it for years and because it works never have gotten around to replacing it with a real bearing press. The big surprise was that the Counter Shaft Drive Gear (the first to be removed) came off with relatively little force. As each gear and spacer was removed I marked it with order of position. The rest of the gears came off as equally well with no extreme pressure from the little jack needed, in fact pressure was so light that it didn't even mark the wooden blocks.

What became obvious once I started to reassemble was that I should have marked all the gear as to which way they faced. As (all but one of) the gears have a beveled in the direction they engage, the other side being flat cut. Of course started off by putting on the wrong way around (2nd photo. Back to the house to print out a photo of the cluster I'd taken earlier on this photo I added ARROWS showing the correct direction for the gears (3rd photo).

Back to reassembly, the gears are not a hand fit but when heated 200F they are very nearly a drop on fit. (4th photo) Used old electric fry pan and IR Gun to heat all the gears to 200F then with a pair of thick gloves it was out of the frying pan and on to the shaft.

So replacing gears on the lower cluster turns out to be no big deal.

Cheers Phil

[Bob Carriere]

....some oil I the pan, not to keep them from sticking to the pan, might have helped (more ?) heat transfer.

You sure cook a good story.

Bob

[Phil Waterman]

Hi Bob

For big gears like ring gears I use the oven, 350F for 15 minutes seems to work best. Grab with clamp on pliers and drop on the flywheel. But as with the gear on the right way around.

You can preheat the gear longer if you are doing pizza.

Cheers Phil

[Marc van Aalderen]

UPS is playing dumb about the crate, when I called them the response was well sometimes we'll remove a crate and repackage if we can't get it on the truck. I think this is double speak for when we bust the crate we pretend it never had a crate and hope you don't notice. Which is kinda dumb on insured packages, you think they try and claim it was poorly packaged.


Hi Phill,

That is the reason we nicknamed them "Useless Parcel Shufflers"

Cheers,

[motto (RIP)]

There was and probably still is a mob in the UK calling themselves Parcel Force. This was easily corrupted into Parcel Farce which was far more apt given their miserable performance when I tried to use them.
Lousy customer service now seems to be going viral and when you get something on the other side of the ledger it zings.
I bought a five speed Clarck gearbox out of a Studebaker US6 a few years back that had suffered catastrophic failure when the winch PTO shed a tooth. The small diameter of the gear allowed for the tops of opposing teeth to try and go through together. The result was that the PTO departed the gearbox taking chunks of the gearbox casing with it.
You're a lucky man Phil.

David

[Phil Waterman]

Hi All

Yes, David in retrospect I was lucky the tooth fracture was such that the mesh of the teeth was maintained an it dropped clear without trying to go through between any other teeth.

What is also interesting is that the section that broke away was not on the V or shift meshing side. With the gear out the clean nature of the fracture can really be seen. I've saved the gear and tooth as a display artifact, thinking of magnetizing the the tooth so I can stick it back in position and have it stay in place.

As I said earlier the original transmission is now all reassembled gears covered in grease ready to go on the shelf as a spare. Figure as long as I have a spare already to instal I should not have any further transmission problems on any of the three CMPs. Of course that just means something else will have to cause the next problem.

Cheers

[RHClarke]

Originally Posted by Marc van Aalderen

That is the reason we nicknamed them "Useless Parcel Shufflers" Cheers,

I hear on the grapevine that Fed Ex and UPS will merge. The new company will be named "FedUp".