what to consider when changing a clutch

[willwal98]

In the process of changing the clutch in my 1g-gte and thought it might be a good time to do a proper job of it (rather than just unbolt / bolt in).

Couple of questions of what to do when

For what reasons should a flywheel be machined when you change your clutch? Is it only if there are score marks from the rivits (if you run it that low) or only if you want to lighten it at the same time?

Should you always put in new flywheel bolts (if it was removed for machining) and new pressure plate bolts?

Rear engine seal, only change it if it leaks or everytime?

Gearbox fork and throwout bearing? My fork squeeks when you use the clutch (something in there anyway) and I always change the bearing but is it always necessary?


Thanks.

[Ghetto-AW11]

Definately get your flywheel machined when you change your clutch, even slightly uneven surface can cause your clutch to wear alot soon than normal. Basically think of it as if you change it all now when its out, throw out bearing etc, then you know its all fine and will last a long time. If you dont change it and a few months later the throwout bearing carks it... then you gota drop it all out again.

[LeeRoy]

Things i reccomend:
1. New clutch plate (obviously ), Definately NEW (not 2nd hand or the old one in there atm) presure plate, and a new throwout bearing.
2. While your there check the rear main seal. If its stuffed replace it - Simple. Or you could replace it to be safe
3. Machine flywheel. This can be because of score marks as above mentioned, or more simply, the heat it has recieved will have probably made the metal blue or coloured. This is what riding clutches does, and this will also help make the flywheel smooth and less grippy. Also because your putting a new clutch in a NEW surface for it would be lovely i would imagine.

All the best - LeeRoy

[Grant]

Also:
4. New pressure plate bolts as you have no idea how many times those ones have been tightened and retightened.
5. New spigot bearing.
6. Check your slave cylinder for leaks. If weaping replace or rekit.

[limbo]

check that it lines up! it happens so dun laugh
Also dun forget to bleed the clutch slave when your finished

[wilbo666]

You will notice that clutch manufactures will not provide a warranty unless you get the flywheel machined. The idea is to have a flat surface with the correct finish to bed the clutch plate in (as opposed to a wonky, glazed surface).

If you have no history of the engine I'd do the rear main seal, spigot bearing and throwout bearing, not that many $$$ and a bit of stuffing around...but when you think of how much you would rather not drop the gearbox again it is worth it.

Who are you going through to get your clutch? Direct Clutch, NPC, Raceclutch? or an off the shelf brand, if you talk to the proper clutch places I reckon there is better value and goods to be had...

Cheers
Wilbo

[beige_bandit]

You will notice that clutch manufactures will not provide a warranty unless you get the flywheel machined. The idea is to have a flat surface with the correct finish to bed the clutch plate in (as opposed to a wonky, glazed surface).

Cheers
Wilbo

Its just like pulling out your old set of brake pads and slapping in new one's with out getting rotor's machined, the pad's wont contact the rotors %100, they will take ages to bed in to the fucked surface of the worn rotor, you will never really get optimum braking performance out of the brakes and the pads wont last as long.

[willwal98]

Got the clutch from yellow rolla. He's a champ, should arrive early next week. It's a kit so it should come with a throwout bearing. I'll have to pull the flywheel off tomorow and take it in for machining (any idea on a rough guess on cost??) and I need to get new clutch mounting bolts because one of the others stripper. Should I do flywheel bolts at the same time and are they high-tensile?

Sorry for the neb question but spigot bearing? Maybe I know it by another name?

[slide86]

i dont know another name for the spigot. its the bearing that sits in the back of the crank. the end of the input shaft of the gearbox sits in there.

it does this so that the shaft is supported on both ends and is balanced, otherwise it would probably break or vibrate.

its a cheap part but an important one!

[ToySprinta]

Also, ask the machinist to increase the step from the flywheel surface to the pressure plate bolts a bit over recommended, gain a few hidden kilos of clamping force

[Big rob]

I just changed, well put a manual in my box. Change all the bearings, spigot and throw out. Get your flywheel machined. Replace your flywheel bolts and remember to loctite back in. Make sure you have correct clutch alignment tool, it makes putting the box back in soo muck easier.

Toyota - 90105-10042 thats the flywheel bolts, you need six.

Match your spigot bearing, i'm pretty sure its 12mm inner diameter and 28 outer.

http://www.cygnusx1.net/supra/librar.../mt/MT_04.html this will show you how to remove and install your W58 plus give you all the tourque info.

Also if you want to replace the rear main seal: TC12660VI from CBC bearings)pretty sure this is correct, if in doubt just get them to match your old one)

good luck


Also anyone know what my 9.5 inch flywheel would have come off? I was told that the largest to fit a 1g was a 9.25".

[allencr]

question but spigot bearing?

It's a pilot bearing in usOFa.

[wilbo666]

Got the clutch from yellow rolla. He's a champ, should arrive early next week. It's a kit so it should come with a throwout bearing. I'll have to pull the flywheel off tomorow and take it in for machining (any idea on a rough guess on cost??) and I need to get new clutch mounting bolts because one of the others stripper. Should I do flywheel bolts at the same time and are they high-tensile?

Sorry for the neb question but spigot bearing? Maybe I know it by another name?

Flywheel machining is about $25-30.

I've reused flywheel bolts in the past.

6201RS is the part number repco stock for the MA61 etc spigot bearing if it is the same (which I suspect it is quite a common part).

Cheers
Wilbo

[wilbo666]

Also anyone know what my 9.5 inch flywheel would have come off? I was told that the largest to fit a 1g was a 9.25".

7M-GE (6 bolt hole with one offest), 2JZ-GE (8 bolt hole) are my two suggestions for a 240mm flywheel. (not sure what size 7mgte is btw)

Cheers
Wilbo

[Big rob]

well its definatly 6 bolt otherwise no idea how its holding on there. What about a 1jz? WHats there flywheels like?