Clutch \ Gearbox Question

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heylinb4nz

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Topic # 173283 18-May-2015 09:47

Recently had an input shaft seal replaced and while gearbox was out did a clutch upgrade on the Colt (2007 Ralliart Ver R).

Nothing extreme, just the standard Autoclutch job in Auckland (New facings, uprate factory pressure plate, re-grind flywheel, new factory release bearing)

Now the Getrag 453 box on these are renowned for neutral gear rollover, but nothing prepared me for the amount of gear rattle after getting this done....not to mention the chirp noise from a brand new release bearing.

Pressing clutch in about 4cm eliminates all noise, so wonder if its a clutch adjustment issue.

Questions :

1) Is it possible the release bearing is kissing the pressure plate when fully out ?

2) If kissing the plate, could this cause additional vibration and thus gear rollover ?

3) Are hydraulic clutches adjustable in any way ?

4) What are peoples thoughts on Fluid cocktails ? thinking of using UUC Motorwerks cocktail for noisy Getrags (Redline 75W140NS + D4 ATF). Usually fluid for this box is 75W90 GL4

lxsw20

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Reply # 1306964 18-May-2015 10:06

Is it pull type? Otherwise the release bearing is closest to the flywheel when the clutch is fully depressed.

If this is a new issue, my first thought would be that either the flywheel has not been milled correctly, or done at all.

heylinb4nz

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Reply # 1307066 18-May-2015 11:11

lxsw20: Is it pull type? Otherwise the release bearing is closest to the flywheel when the clutch is fully depressed.

If this is a new issue, my first thought would be that either the flywheel has not been milled correctly, or done at all.

Hmmm unsure, I know its hydraulic mechanism and box is a Getrag 453.

The gear rollover was always there in neutral on the old setup (pretty much par for course on Getrag boxes), certainly not as loud as it is now.

The flywheel was ground vs machined, Autoclutch Auckland did the work so highly unlikely its anything to do with their items, they balance the entire assembly (plate, disc and flywheel) when done and also do before and after clamp loads, + release measurements.

Sound like you are on the money though, and if pull type, I need to pull the release bearing back another 3mm or so. If push type then I guess im screwed and need to ditch the whole setup and go for a brand new stock clutch, which is unfortunate :(.

Lots of guys over in Aussies run uprated clutches from Exedy and Extreme with no issue, so hopefully its just a adjustment issue.

lxsw20

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Reply # 1307068 18-May-2015 11:14

It would be worth taking back to Autoclutch to see what they have to say.

heylinb4nz

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Reply # 1307083 18-May-2015 11:30

lxsw20: It would be worth taking back to Autoclutch to see what they have to say.

Autoclutch advice was

a) adjust freeplay
b) change fluid to correct API (GL4) currently running GL5

Been running GL5 (Redline 75W90) since May last year with no issue, so fluid is 2nd on my list, and even then if not solvable I will try the UUC Cocktail as a last resort.

I've booked into Mitsubishi to see if they can adjust they may have more experience with the clutch system fitted to that car and may be able to shed light.

I wonder to if unable to apply extra pull to get bearing away from pressure plate, then perhaps a little extra push could be achieved ?? not so much as to engage the pressure plate and reduce clamp, but enough so the releasing bearing is not kissing ??? although this will drastically reduce my release bearing life span I guess ????

heylinb4nz

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Reply # 1307089 18-May-2015 11:41

Found this

http://www.sachsperformance.com/product_info.php?language=en&products_id=696

So looks like my issue is not enough preload. Apparently Sachs release bearings are designed to be pre-loaded onto the clutch plate and spin with the plate to prevent noise (and possibly vibration)