Gearbox overhaul

Technical questions and Maintenance advice post in here please
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A40FARINAGURU
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Re: Gearbox overhaul

Post by A40FARINAGURU »

gazza82 wrote:So I have four clutch release arms, two of which are the same and in the middle of this pic. They look like 22G167 and have the ring end. One has the pivot bolt.

Of the others one has a pivot point much higher up near the release bearing fork, 2A3098?, and the other has the other type of end with what I assume is the type for a hydraulic clutch, 22G168(?).
20170423_165903.jpg
top one is i guess an A40 but not sure if 948cc or 1098cc without checking :study:
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Paulc
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Re: Gearbox overhaul

Post by Paulc »

"Paul, when you had the muscle building setup, were you using the 1275 box or the smoothcase?"

I was using a ribbed box (not a Midget one) at the time............I'll need to ask the 'mechanic' how he adapted the linkage.

Is there definite 'proof' that the Midget boxes are stronger than the standard ribbed box?
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Re: Gearbox overhaul

Post by Hurtzberg »

Thanks Paul, no idea but in my case it is midget ribbed vs a35 smooth.

Sounds like The 1098 minors are mechanical (I believe) so as long as the pivot point on their ribbed boxes are the same as the midget ribbed, all I'd need to do is fit the clutch fork from a ribbed Minor.

These are 10 a penny so worth a try to get on the road quicker.
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Neil Evans
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Re: Gearbox overhaul

Post by Neil Evans »

Paulc wrote:
Is there definite 'proof' that the Midget boxes are stronger than the standard ribbed box?
They have a different part number and people pay a premium for them, but what the actual difference is I'm not aware...
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Re: Gearbox overhaul

Post by gazza82 »

Probably gearing ratios. The 1098 is a much higher 1st so acceleration will be slower. Designed for heavier cars.

Gear lever is also different on 1275 boxes.
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Re: Gearbox overhaul

Post by Hurtzberg »

Better bearings too
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Re: Gearbox overhaul

Post by Hurtzberg »

Any thoughts on how to test this box without the hassle of fitting it and finding out the hard way?

I've taken the side cover off and it all seems shiny and clean.

Did just spot that there is a chunk cut from the bottom of the bellhousing. Any reason for that and does it make this scrap?

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beko
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Re: Gearbox overhaul

Post by beko »

Midget has closer ratios, and uses needle roller bearings on the intermediate gears rather than a brass bush - I believe this make sure the box tougher but I'm sure the life of the box is more influenced by the way it is used.
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Re: Gearbox overhaul

Post by Dave Clark »

Looks to me as if "someone" has cut a chunk out of the bell housing , probably to see if they can free a stuck clutch.

I would be happy to use that gearbox if all else is OK.

Difficult to assess a gearbox without stripping it, but look for chips or marks on the gear teeth and see how much "waggle" there is on the first motion shaft as a very rough guide as to front bearing condition. Even new boxes have some play so be aware. Te only real way to check if bearings and selectors are OK is to fit it and drive it or strip it out. Even stripping means that some experience is needed to assess whether some parts are re-useable or not. IIRC a rebuild kit is quite cheap once you have decided that all it needs is a refresh with new bearings seal and gaskets.
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Re: Gearbox overhaul

Post by David Swain »

Careful, you will be in trouble using words like waggle. Mr. Clark! :rol:
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Re: Gearbox overhaul

Post by Neil Evans »

Dave Clark wrote:
Difficult to assess a gearbox without stripping it...
I would say impossible, unless there is something glaring, such as chipped teeth or visible rust.

Years ago when I worked as a commercial vehicle mechanic I was given a second hand lorry gearbox to fit, but before doing so I had to change the top cover over as it was from an earlier model. I noticed that the gear train and selectors showed a huge amount of wear and I initially rejected the idea of fitting it as I feared it was scrap. The 'box worked perfectly for around 18 months of daily use, covering many thousands of miles... :whistle:
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Re: Gearbox overhaul

Post by Dave Clark »

Wiggle then ? Don,t understand why what I said could be misinterpreted.
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Re: Gearbox overhaul

Post by Big Daddy »

Dave Clark wrote:Wiggle then ? Don,t understand why what I said could be misinterpreted.
This forum is a minefield Dave... :whistle:
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Re: Gearbox overhaul

Post by gazza82 »

He can waggle .. or wiggle .. :)

It's just some people read different meanings into words .. :rol:
"If you're driving on the edge ... you're leaving too much room!"

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Re: Gearbox overhaul

Post by Big Daddy »

gazza82 wrote:It's just some people read different meanings into words .. :rol:
Deviated preverts... :mrgreen:
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