Clutch Adjustment

[Big Jim]

After running the Hood with the Vauxhall in now for some 6,000 miles(or more!) one of the problems that I had, was it got harder to engage 1st or reverse, as it got hotter (ie. on a good run) the clutch was dragging slightly, and although the pedal adjustment was doing what it should, I found that I needed to pull the cable just that little bit more, but couldn't.

To cut a story short, I sorted out the problem with a different adjustment quadrant, (the yellow bit with the ratchet teeth) we found out that the 'standard' quadrant is 45mm from the pivot point to where the cable sits, but you can also get them at 50mm, and 55mm, these will then give you more cable pull.

So if anyone is suffering from the clutch dragging and making it difficult to engage gear when stopped, there's your answer!

 

They are only about £5 from your local motor factors too!

[Spannerman]

Jim

 

The Theory was correct then, no need to mod the old qaudrent then,

is the pawl the same then? teeth and that.

 

How much extra movment at the gearbox end do you get then?

 

Cheers

Kevin

[Mitch]

Hi Kev

the quadrants are all the same size externally, its just the groove the cable sits in,

on the 45mm the groove is deep and it gets shallower as the size increase's.thus there is more area for the cable to go around and it makes the cable shorter.

I found this out on monday when i went for a replacement for mine.

HTH

Mitch

[Guest nelly]

Hi all,

 

You should be able to work out the increase in cable travel gained using some old-school maths.

 

You need to know a couple of things - first how many degrees of movement the quadrant has when you push the clutch and second how far it is from the pivot to the cable groove (45mm, 55mm etc.,).

 

The quadrant movement is like a sector of a circle - a slice of cake shape. If you can work out what the entire circumference of the circle would be, (using pi (3.142)x diameter (twice the radius from the pivot to the base of the groove)) then work out what proportion of the circumference your quadrant actually travels, all you then do is multiply the first by the second and you should get the distance your cable actually moves. If you work this out for the two different sized quadrants you can compare the travel.

 

For example, using a 45mm quadrant, the circumference would be 3.142 x 90mm = 282.8mm.

 

If the quadrant travels 60 degrees (anybody actually know this measurement?) that equates to one sixth of the circumference.

 

One sixth of 282.8mm is 47.1mm - the cable travels 47.1mm

 

By contrast a 55mm quadrant, moving 60 degrees would cause the cable to travel 57.6mm - better by about a centimetre.

 

Now - I'm not exactly sure of the actual measurements involved here - these figures are hypothetical, but I hope they help you work things out. Damn it - I hope it's the right method even! Please feel free, anyone, to put me right/factor in the 'real' measurements.

 

Cheers,

nelly

[Big Jim]

Yes Kev the theory about buiulding up the slot was right, but it would have taken a good few pieces of "tie wrap". With the 50mm one in, it still "nicked" as you put it into gear, but with the 55mm one in, it's clean.

don't get bloody complicated with angles of dangle etc. it works!

[Guest nelly]

Fair point

 

Just can't get the teacher out of the man!

 

nelly

[Big Jim]

You know what they say. "Them that can, do! Them that can't, teach!"

 

Sorry nelly, Can't get the evil *bleep* out of me!.........

 

 

ONLY JOKING!

Edited September 6, 2003 by Big Jim

[Guest Tony Tank]

Now Now then boys lets not have handbags at dawn, it's not with in the club spirit is it. But if one of u wants a second i'm available. Tony

[Guest nelly]

When I was training as a teacher we had an extension to that saying...

 

Those that can't teach, teach teachers.

 

And I suppose those that can't even do that, make Ford Sierra wiring looms, if my donor is anything to go by!

 

nelly

[Guest daveg]

but with the 55mm one in, it's clean

 

Jim, do you have a part number?

 

Dave

PS yes this thread is nearly 2 years old...like my build! :boohoo:

[Guest Battery Bill]

Dave

PS yes this thread is nearly 2 years old...like my build!

 

No wonder your build is still going, you are looking at 2 year old posts I though it was funny that I had not seen the first few threads

[Guest docter fox]

i think you can go by the different colours as being the different sizes?

 

dont know which is which though

[Mitch]

you cant go of the colours as some suppliers used all the same colour,

 

if you go to you're local motor factors and ask to see several diffrent ones, you will see the difrence, or look in his book it may have the dimension, i think it maybe a escort one that you need, but you will have to check.

 

also look on Jims site, he may have the part number in his build tips

 

HTH

Mitch

[Guest daveg]

I fixed the clutch THIS way

[Guest salty_monk]

The 55mm part is a Fiesta Quadrant, from an 89/90 I think... You get a 50 for a Granada but it's still slightly too small.

Take the 45mm (yellow) to the factors & get one that looks identical from the side, don't get the "quarter" 55mm quadrant, it doesn't work, should be a semi circle.