The purpose of this Blog

This blog is to detail my 43 years (1973 - 2016) with a 1928 Chevrolet tourer, affectionately called "The Red Chev".

The acquisition, restoration, improvements and my experiences over the years are covered in as much detail as I can remember.

Some of the later postings include car club outings and other vintage car items that I hope will be of interest to people.

If you have the time, scroll back to where it all began in 1973 and follow the journey so far.

Thanks for dropping by.

Regards Ray Dean


See my new section "The Red Chev - Repairs, Improvements, Maintenance and Technical Details" located on the left hand side of the screen.




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Sunday, November 3, 2013

Unexpected Gear Box repair

While testing the 6 to 12 volt converter from yesterdays session, the gear change seemed noticeably sloppy. This was a surprise as I overhauled the top of the gearbox in 2010, which resulted in a very tight gear change.

The first thought was I had a broken spring in the gear shift top cover, but after pulling the gear stick out, the spring was fine.




The next step was out with the carpet, after sealing up the top of the box from dirt and dust.


Out with the floor boards, which gave me the opportunity to check out the connections and water levels in the double battery set up.


Removed the gear box tower, all appeared OK with the selectors and gate, no excessive wear.



Nice to see the gears that I put in (NOS) back in the nineties are still in good condition.


Found the problem?

In 2010 I replaced both the pins in the top of the tower that the gear stick pivots on, and on initial checking one was a fraction loose. This was part of the reason, the rest of the slop was caused by excessive play between the pins and the groove in the gear change ball. The pins I used for the replacement where normal mild steel, and the groove in the gear change ball had been welded and machined back to standard. So its look like the mild steel pins have worn.

As an interim measure I was able to turn both the pins 90 degrees so that the original clearance was restored. I then re peened the ends of both pins into the housing.

I then stretched the gear shift retaining spring about 5 mm, refitted the gear change, made a new gasket for the top of the gear box, and put the whole lot back together.

Below is a not so clear picture of the pins in the gear box tower, which are smooth and not rough as the blurred picture looks.


 
Went for a test drive, everything back to normal, gear change is "tighter" and smoother.

Having a few spare gear box towers, some with replacement pins fitted, will enable me to make and have ready a replacement top with hardened steel pins if the problem happens again.

6 comments:

  1. what are you making the pins from

    ReplyDelete
  2. I made them from bright steel round bar.

    Cheers

    ReplyDelete
  3. This is a great car to watch of late 70's the chevrolet,but its sad to here that it has a repair an unfortunate and unexpected repair anyhow thanks for showing your car to us
    Automatic clutch repairs

    ReplyDelete
  4. Excellent post! I must thank you for this informative read. I hope you will post again soon.
    Kind regard

    Custom Made Gear Box India

    ReplyDelete
  5. Even though you had to deal with gearbox issues with your 1928 Chevrolet, at least you can get it all taken care of and repaired. You can either do it yourself, or you could get a gearbox specialist to help you out. They will be able to take care of everything for you so you don't have to.
    http://www.gearstop.com.au

    ReplyDelete