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06-18-2003, 09:07 PM
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CC Member
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Join Date: Apr 2001
Location: San Diego,
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Cobra Make, Engine:
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Difficulty with 3rd Gear
The problem is it doesn't seem like there is enough throw to properly engage third--it feels too short. All feels normal; slides past neutral and you encounter resistance as you are about to engage third. It is from that point forward that it feels odd--like I said seems short and awful easy (not much resistance) to push forward.
Of course, this makes a grinding noise--but it does go into third. If I'm real careful (two step, slow motion) it won't grind. But this is new behavior, so I want to find the trouble.
All other gears act completely normal. I was under the car tonight and can engage all the gears pretty easily. I tightened the three bolts that secure the linkage to the transmission (all a hair loose). I see nothing amiss on the other (shifter) end. But I confess to being ignorant about transmissions.
I seems to remember something from my boyhood about using a quarter-inch drill bit as an alignment tool (Hurst shifters), but I do not see where the hole is.
Trans is CR big in/big out.
Any help is appreciated.
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Bill Malone
Gashole
CSX4786
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06-18-2003, 10:26 PM
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Once more,,,in harmony
Sounds like the synchomesh ring for third is broken. Third gear will still work, the synchro just makes it "smooth" and offers some "resistance" when you engage the gear. If it aint there, shifting would have little resistance as long as the "gear speeds", engine rpm and drive shaft speeds are all in "harmony". If not, it will "grind" a little as the various "speeds" in question come into harmony.
Sometimes I shift my 5 speed without the clutch, just rev the engine to match road speed for the next gear up or down. When you get it "right" it just "falls in" into place with little or no resistance because the "synchro" doesn't have to "match speeds".
Ernie
Last edited by Excaliber; 06-18-2003 at 10:34 PM..
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06-19-2003, 04:28 AM
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Member of the north
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Join Date: May 2003
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Ernie's got a point, if the syncro is broken or in bad shape, it could give you the problem you are discribing.
I had one that was cracked. every once it a while, I had to work at getting into second gear.
Are you talking; toploader with Hurst comp. plus?
Nice weekend project.
Hope this helps.
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06-19-2003, 06:55 AM
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Trularin, yes, that's the setup.
I was afraid that was the problem, although it would sure be nice if some type of adjustment would fix the problem.
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Bill Malone
Gashole
CSX4786
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06-19-2003, 07:56 AM
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Member of the north
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Well, remember to use grease on the roller bearings when you reassemble the trans. David Kee has both the gasket kit ( $35.00 I think ) and the brass ring.
Make sure to realign the shifter after you are done.
Good luck.
Hope this helps.
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06-19-2003, 08:23 AM
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Location: Aylmer, Quebec, Canada,
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Hi Ernie,
how do you
"just rev the engine to match road speed for the next gear up or down" ?
Without trial and error how can you figure the right varibles before you shift? or is it just shoot and miss until you figure it out?
Inquiring minds want to know...
Thank you
Jim
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06-19-2003, 08:40 AM
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Of course this is not recommended, I'm either a "professional" or an "idiot", take your pick. LOL
Shifting UP is generally easier to do than shifting down (but down is more fun). Say your in 4th at 3000 rpm and you want to shift to 3rd. What rpm will the engine be in when the shift is completed at the SAME road speed as in 4th? THATS the rpm the engine needs to be "revved" to to get the gear, engine, road speeds to match.
Rule of thumb: Shifting up is less rpm, down is MORE rpm.
This is HARD on the tranny if you screw it up! I learned the technique over the years with various cars with "bad" clutches and had no choice but to shift like that. Some real race drivers DO shift like that on occasion.
Next lesson: What is "double clutching" really? A method of matching "gear speeds" to minimize the wear and tear on the synchos, or in the "old" days, when we didn't HAVE synchros!
Ernie
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06-19-2003, 09:58 AM
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Thank you.
Now I have something to try on the old winter beater.
Thank you
Jim
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06-19-2003, 10:04 AM
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Ernie,
I learned to shift without the clutch in the military with the old jeeps. Like you said, not to easy on transmissions but fun when you don't mess it up. I don't do it any more as I have to pay for any broken things. Get a Jerico transmission for that stuff if you do it all the time.
Ron
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06-19-2003, 11:38 AM
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On the Formula Fords, for instance, you have "square cut teeth" on the trans, there IS no synchromesh. Square cut means STRENGTH. You HAVE to double clutch to down shift.
Clutch in, move gear lever to neutral, let clutch OUT and QUICKLY rev up the engine to match road speed and spinning gears in the tranny speed, now quick before the tranny gears slow down, stab the clutch and push the gear lever hard into the next lower gear.
Get it right and it slips right in! Get the rpm wrong and you waste the tranny, miss the gear and loose the race!
Now do this while braking HARD for the corner with the ball of your foot pressing hard on the brake pedal and the heel of your foot reving the engine to the right rpm for the down shift! Whew, is it busy in the cockpit or what????
Ernie
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06-19-2003, 12:15 PM
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06-22-2003, 10:08 PM
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Sorry I was at DVSF III all weekend. You can double check the shifter adjustment by shifting to nuetral and using a pin to align the levers. Normally if the adjustment is off by much it will affect more than one gear. It sounds more like what other members have described above.
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06-23-2003, 07:48 AM
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Thanks David. I was able to get a 1/4" pin in the alignment hole this weekend. THis was easy enough to do, so at that point I pretty much ruled out any alignment-related problem. Just for kicks, I "shortened" the arm for third gear--first one turn and then drove it. Very little difference. Then, turned it two more revolutions and drove again. Still the same for third, but it had lessened the throw for fourth enough that it was noticeable.
Will shoot for pulling the trans next weekend, although I am smack in the middle of building a 90' reatining wall in my backyard, so it may have to wait.
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Bill Malone
Gashole
CSX4786
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