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clunking noise in first gear

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docgibbons Martin Johnson
Ross On Wye, UK   GBR
i''ve recently acquired a clunking/knocking type noise in first gear with my morris saloon (1958, 948cc) which promptly disappears when in the other three gears.
anyone know what this might mean?
i can happily do without first gear, unless tacking porlock hill, but wouldn't like to think i'm damaging anything even if using just the other three gears.

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emjay Jim English
Marietta, PA, USA   USA
How's reverse? You most likely have taken out a chunk of the straight cut gears. If reverse is fine then it is not across the entire tooth. The good news is these gears are not engaging while 2, 3, or 4th are selected. You could limp along for a while.

docgibbons Martin Johnson
Ross On Wye, UK   GBR
now you mention it, reverse is similar, although not as noticeable.
starting to sound expensive. gearbox on the way out?

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Welcome Martin,

You will find many suggestions for any problem here. With the date of your car it probably has a smooth case transmission, which parts are rare or non existent. It does sound like you can get by for a while as Jim said. I would suggest that you do a fluid change and see if you have many shinny bits in the fluid. A check in the side case cover with a magnet might find a bigger chunk that you should get more miles from if it's out of there. I have not pulled this cove in the car so I do not know if it's possible but it's worth a try.
Should you change things be sure to start looking for a rib case transmission, these can be repaired and on your side of the pond should be plentiful and probably rebuilt for a OK price.

Welcome and good luck!

TX
Mr fixit
Chris smiling smiley

docgibbons Martin Johnson
Ross On Wye, UK   GBR
hi chris,
thanks for the welcome message, and the tips. i have recently discovered a small morris minor specialist (works from his own property) about half an hour from me, and he did a nice job of an alternator conversion, new boot lock, oil change, and tickover issues. so will take it round to him to take a look at and let you know what he thinks. i was planning my next job with him to be some welding (amazingly, the car has never had a single weld since 1958, but needs a few now) but that might have to wait now.

John in Eugene Avatar
John in Eugene Platinum Member John Quilter
Eugene, OR, USA   USA
Yes, it is possible to remove the side cover with the gearbox insitu. In fact when it is off most all the gears can be inspected for broken teeth. Be sure to lay in a new gasket however.

John Quilter
Eugene, Oregon USA

In reply to # 29942 by Mr fixit Welcome Martin,

You will find many suggestions for any problem here. With the date of your car it probably has a smooth case transmission, which parts are rare or non existent. It does sound like you can get by for a while as Jim said. I would suggest that you do a fluid change and see if you have many shinny bits in the fluid. A check in the side case cover with a magnet might find a bigger chunk that you should get more miles from if it's out of there. I have not pulled this cove in the car so I do not know if it's possible but it's worth a try.
Should you change things be sure to start looking for a rib case transmission, these can be repaired and on your side of the pond should be plentiful and probably rebuilt for a OK price.

Welcome and good luck!

TX
Mr fixit
Chris smiling smiley

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emjay Jim English
Marietta, PA, USA   USA
The side cover does give a good view point however, the first speed wheel is covered by the shift fork and makes it difficult to see the lay gear and the reverse wheel, all of which would be the source of the clunk. That's from looking at it on the bench with a good light. If you take the cover off, keep track of the two springs that might fall out. They usually don't but keep an eye on them. They'll help push the cover off.

Jim,

That is a good point on the springs, I had a tranny on the bench and one of the springs went flying never to be found in the shop. Keep us updated if you can Martin, as we all learn from others adventures.

TX
Mr fixit
Chris smiling smiley

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0123 Mike D
Biddulph, Staffs, UK   GBR
A brown envelopes & cornflake packets make excellent gaskets.

It's a make do and mend era car after all smiling smiley

https://www.iwm.org.uk/history/10-top-tips-for-winning-at-make-do-and-mend

66jalopy Avatar
66jalopy Silver Member Phillip Jolliffe
Lake City, FL, USA   USA
As mentioned, 1st gear cog is either missing teeth or, much more rare, it has half split open. Ask me how I know, almost put one back together as I couldn't see the damage. Staying out of 1st and using reverse as little as possible it will run until something else goes wrong. Patiently look for a good ribcage.

usmh3 Avatar
usmh3 Rob Thomas
Cardiff, Wales, UK   GBR
https://www.ebay.co.uk/itm/Endoscope-5-5mm-LED-Snake-Inspection-Camera-Lens-IP67-for-Mobile-Phone-PC-Laptop/232247993020?epid=576055859&hash=item36130f22bc:m:m7-KFR5BJ6eE-VjAF5DKWVg

I bought one of these. You can shove it up exhaust pipes or even up your nose. great fun for all the family! If it works for haemorrhoids then it'll work for gearbox teeth. smiling smiley

0123 Mike D
Biddulph, Staffs, UK   GBR
I 'opes yer wipes it between your piles and your schnozzle,

tjt77 timothy Trevithick
Grass Valley, CA, USA   USA
the noise in fist gear is commonly due to chipped gear teeth on 1st gear and the layers it meshes with.. there no easy answer the than a REBUILT TRANSMISSION.,, it will get worse..

docgibbons Martin Johnson
Ross On Wye, UK   GBR
i've finally managed to get it looked at, and it would appear that it's a bush issue. requires a recon gearbox, with advice not to drive it again until repaired in case the whole lot breaks and the car can't be driven at all. so, will be looking round now for a replacement part. thanks for all the advice.

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