Technical Clunking and grating while shifting

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Technical Clunking and grating while shifting

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Sep 8, 2015
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Bergen County, NJ USA
My 1971 500L is fun to drive. Specially after the 123ignition upgrade. Dave from Mrfiat was most helpful!

The shifting on the other hand is quite unfriendly. 1st to 2nd results in a loud clunk and 2nd to 3rd to 4th often results in a slight grating.

Does anyone have any ideas or has experienced anything similar?
 
On up-shifts it shouldn't make any difference as to which gearbox you have ---you only need to double-de-clutch on down-shifts. Get the revs right and you can actually change gears on the 500 (non-synchro) box without using the clutch at all--up and down. I once (in my impetuous 'yoof') won a pint of beer by driving from south London (West Wickham to those that know north Kent) to Westminster Bridge without using the clutch except for pulling away after mandatory stops (traffic lights etc.) or an emergency. On the 126 'box, the synchro holds the gear 'in', so it is actually harder to drive 'clutch-less' with the 126 'box than it is with the 500 'box.
I would suggest that you probably have too much clutch-pedal free-play. The 'book of words' says that the free-play AT THE PEDAL should be between 1-3/8in and 1-9/16in (35-40mm to those that think metrically). Checking the free-play and (if necessary) adjusting it would be the first thing to do.
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I'm glad this question was asked as I was having the same "issue". Changing down double declutching is OK (when you have enough notice....less easy when you suddenly need to pull in between parked cars for example). Changing up does grate nearly all the time - only avoidable if you change slowly and let the revs drop a bit.

Clutch seems fine but for a newbie to all this can you explain what "free play at the pedal" means (and how you check it/adjust it)?

If this is OK, are there any other suggestions as to what the problem could be (or if it is a problem at all...I can't believe that it is not damaging)?

Thanks all
 
Free play is the how much the pedal needs to be depressed before the clutch release bearing contacts the clutch diaphragm.
When you press the pedal you should feel some additional resistance when the bearing takes up the load.
If there is no free play, then the clutch release bearing will spin all the time at the speed of the flywheel and soon burn out.
If you remove the lower flywheel cover held by 3 10mm bolts you can see the mechanism.
You need to adjust the clutch cable to take up some of the free play as the clutch wears.
Hope this helps.
 
On the non-synchro box there is technique that you can use changing up a gear which will help. With the clutch pedal depressed, gently but positively move to neutral, stop momentarily and then select the next gear. Going down, again you usually stop briefly in neutral, increase engine speed quite significantly and then carefully plop it into the lower gear. With experience you can sometimes do this in one fluid movement, depending on current gear, road speed and gradient.
The overall key to this is to change gear without rushing and to drive frequently to gain experience.?
 
On the non-synchro box there is technique that you can use changing up a gear which will help. With the clutch pedal depressed, gently but positively move to neutral, stop momentarily and then select the next gear. Going down, again you usually stop briefly in neutral, increase engine speed quite significantly and then carefully plop it into the lower gear. With experience you can sometimes do this in one fluid movement, depending on current gear, road speed and gradient.
The overall key to this is to change gear without rushing and to drive frequently to gain experience.?

I do something similar when changing up which seems to be the smoothest and as far as I know the preferred method.

So changing up say from 2nd to 3rd. 2nd gear, Clutch down, into neutral, clutch up, clutch down, into 3rd. Just seems to produce the smoothest gear change.
 
I do something similar when changing up which seems to be the smoothest and as far as I know the preferred method.

So changing up say from 2nd to 3rd. 2nd gear, Clutch down, into neutral, clutch up, clutch down, into 3rd. Just seems to produce the smoothest gear change.
That's what my uncle taught me in the good old days... It forces you to take your time between gears.
 
I do something similar when changing up which seems to be the smoothest and as far as I know the preferred method.

So changing up say from 2nd to 3rd. 2nd gear, Clutch down, into neutral, clutch up, clutch down, into 3rd. Just seems to produce the smoothest gear change.

That full double-declutch will work best on downshifting, when you blip the throttle at the neutral stage to speed up the input gears ready for the gearchange. I find that when going up the gears, because the engine naturally slows down as I depress the clutch and remove my boot from the throttle, the slight pause in neutral is usually all that's needed.

Occasionally, when downshifting on facing a decent incline, I can keep my foot on the accelerator as I dip the clutch and the lower gear slips in just nicely. What a sweet feeling that is and it's a part of the Fiat 500 Fun for me.:D
 
To enable one to slow down (by braking) as well as changing down a gear at the same time, one needs to perfect the art of 'heel and toeing'. To do this (and it is very easy in the 500), as you brake you roll your foot onto the accelerator when required and this enables you to 'blip' the throttle during the 'double de-clutch' manoeuvre. Get this perfected and it is amazing how quick you can change down a gear, and brake at the same time. As I said in an earlier note, get it right and you can drive with a 500 gearbox surprisingly smoothly (and quietly).
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Just had this very same problem. I had the clutch cable adjusted and gear changes are now easier and smoother than ever.
Stu...
 
I do something similar when changing up which seems to be the smoothest and as far as I know the preferred method.

So changing up say from 2nd to 3rd. 2nd gear, Clutch down, into neutral, clutch up, clutch down, into 3rd. Just seems to produce the smoothest gear change.


Smarty-pants Tony Vitesse (y)
I thought I would checkout the technique you described and find that in practise, that's what I do already when changing down. It does also help when changing up the gears.(y)
 
Smarty-pants Tony Vitesse (y)
I thought I would checkout the technique you described and find that in practise, that's what I do already when changing down. It does also help when changing up the gears.(y)

Yeah but after a while it becomes second nature and you do it without realising, especially with the amount of miles you do. The problem I find the most challenging is when you come to a junction and you have to stop or giveaway, if it is a giveaway, then I tend to change down to 2nd and keeping it rolling hoping the way is clear so you can accelerate away still in second. If a stop then approach in 2nd and drop it into 1st once you have stopped. It's all about keeping the momentum going in a 500.

Roundabouts are the best, just try not to slow down at all and take them flat out, even if you are turning right.:D
 
Roundabouts are the best, just try not to slow down at all and take them flat out, even if you are turning right.:D

I completely identify with that "procedure".
It shocks the life out of following drivers as you roar around and see them trailing behind as you take your exit.
The best one we have is for the airport turnoff on the A96. I'm going straight on and as there is great visbility and I have worked out the best line to take, I know exactly when to slip into third gear with no braking and whizz across.
To an observer it probably seems that I just keep my foot down with no slowing-down.
great fun and another reason for using the 500 so regularly.:)
 
I have been poring over this, as well as the manual and even the youtube video a user posted on the clutch heel toe thingy and the non-synchro gearbox. But still clueless...

Starting from the beginning, ie yesterday, I went for MOT and took the car for the longest drive she's had since purchase. Egads it was stressful, to the point I almost turned back.

Essentially I cannot change gears without a crunching sound and an awful feeling that something bad is happening transmitting up the clutch pedal. I am double clutching on downshifts to no avail, and slowing markedly trying to gently ease it into gear. Admittedly I haven't tried the accelerating a little while in neutral as this seemed counterintuitive to rev up when trying to change down. But the crunchiness is on both up and down shifts.

I pulled the carpet back to rule out any restriction on clutch being depressed all the way, but that failed, and so as a first step I'm keen to adjust the cable - but I have no idea how! The manual is, to me, totally cryptic :(

I've looked at these pictures and wonder if I adjust the nut one way or another that Peter had been playing with, then I'll have some luck?

https://www.fiatforum.com/500-classic/426161-clutch-cable-adjustment.html?426161
 
Not sure if this is the issue - comparing mine with the post from fiat500 there's no spring
Although this seems to be more to serve the purpose of re-engaging the clutch.

Also I have oil everywhere! Will have to replace the sump gasket and see if it's that, hoping its not gearbox oil
 

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It could be the clutch cable needing tightening as in my post, it might be the position of the gear lever needing adjusting at the side of the internal tunnel, the clamping of the clutch cable has cropped up many times on here, but my guess is that the rubber "lollipop" connection from gear rod to gearbox actuating rod is damaged or loose or too tight. The MOT man may have pulled on an already weak component to test it or inadvertently been a bit rough with gear-changing through unfamiliarity.
It is least likely to be an internal gearbox issue.
Fiddle around with it or at least upload some images of the underneath arrangements for our perusal. Good luck.(y)
 
Thank you fiat500 does the lack of spring on the clutch lever underneath as in the pics seem a concern.
The gears have been iffy since I got it, but I hadn't got it above a few trundles around the street so it didn't really alarm me, so thankfully it wasn't the garage.

Would I access a view of the internal tunnel accessed from inside the car, or underneath?
Thanks again!
 
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