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01-10-2021, 01:23 PM | #1 |
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pops, slips, drops out of second gear
I have a "rebuilt" transmission that was won in a raffle. Please read all of this message before responding. When I put it in my car it popped out of second gear when going up hills. Usually when I would back off the accelerator. This was not just a "slip out of gear". If I put my hand on the shift knob and tried to hold it in gear it took considerable force to hold it in gear. I have since removed it from the car and have taken it apart. The tower plungers and springs are OK. I did swap out the tower with one that did not pop out of gear and it still popped out. Thus the problem is NOT in the tower. The bearings are sealed and appear to be new. The gears do not appear to have any pits or wear. Shims were used between the engine and the housing. What else should I check?
Bob |
01-10-2021, 02:39 PM | #2 |
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Re: pops, slips, drops out of second gear
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01-10-2021, 02:47 PM | #3 |
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Re: pops, slips, drops out of second gear
Did you change the pilot bearing??
Paul in CT |
01-10-2021, 04:45 PM | #4 |
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Re: pops, slips, drops out of second gear
It was a freshly rebuilt engine. I did not rebuild the engine so I can not say for sure that there was a new pilot bearing. But it looked new.
Bob |
01-10-2021, 05:07 PM | #5 |
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Re: pops, slips, drops out of second gear
Hi Bob,
my car had exactly the same problem. Much tried: New shift forks, tower rails, shiftin' balls and springs, thick ATF oil. The problem didn't go back. The cause was an inclined plane on the teeth of the cluster.
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Beste Gruesse aus Deutschland, Werner Ford Model A, Roadster, 1928 Citroen 11 CV, 1947 Hercules W 2000, 1976; (with NSU-Wankel Rotary Engine), Canadian version |
01-10-2021, 05:22 PM | #6 |
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Re: pops, slips, drops out of second gear
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01-10-2021, 07:03 PM | #7 |
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Re: pops, slips, drops out of second gear
Here are some pictures of the gears. The top two pictures are the cluster gear. Then last two are the second gear.
Bob |
01-10-2021, 11:40 PM | #8 |
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Re: pops, slips, drops out of second gear
You have eliminated the tower / forks / detents etc by swapping the tower.
My guess would be either some poor quality repro gears, or too much clearance in the sliding gears on the main shaft. |
01-11-2021, 01:10 AM | #9 |
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Re: pops, slips, drops out of second gear
Neither side of 2nd slider looks like original one
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01-11-2021, 02:40 AM | #10 |
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Re: pops, slips, drops out of second gear
The attached article was written a number of years ago and covers most of the reasons that a Model A transmission jumps out of gear.
The only new addition is the redesigned off-shore roller bearings that have a service life of 300 - 500 miles that are now the only ones available. Tom Endy |
01-11-2021, 12:06 PM | #11 | |
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Re: pops, slips, drops out of second gear
Quote:
Have you heard anything regarding better bearings under development or soon to be available? Thanks Good Day! |
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01-11-2021, 01:05 PM | #12 |
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Re: pops, slips, drops out of second gear
The gears are labeled "MARK USA". Are these gears good or bad quality?
Bob |
01-11-2021, 02:21 PM | #13 |
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Re: pops, slips, drops out of second gear
Bert's did have some of the "Good Bearings" (not the ones that are advertised in the catalog). I bought a set some months ago, 'just in case'. I don't know if they are still available, give Steve a call.
Last edited by Y-Blockhead; 01-11-2021 at 02:30 PM. |
01-13-2021, 12:12 AM | #14 | |
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Location: Mint Hill, North Carolina
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Re: pops, slips, drops out of second gear
Quote:
Several posters have mentioned their experience with main and throwout bearing quality. The article referenced has pretty much identified all causes of sliding out of gear... but you have eliminated several of those by swapping the tower. |
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01-13-2021, 12:26 AM | #15 |
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Re: pops, slips, drops out of second gear
MARK gears are the best in my opinion next to original Ford ones. I have them in my case and they work well. Even with good new gears the fit on shafts need to be checked during assembly. I had to get a second main shaft to solve this same problem. The mechanics service bulletins address this.
Last edited by J Franklin; 01-13-2021 at 12:33 AM. |
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