problem with Throw out length 1JZ/W58

[Hipsi]

Okay, got the cressida on the road yesterday and ran into an issue almost immediately. When I disengaged the clutch (ie pedal to the floor) I got a really nasty radial grinding noise.

I've dropped the box today to have a look. What seems to be happening is that the throw out bearing is sliding so far up the input shaft prior to touching the clutch fingers that it's sort of skewing off the end of the shaft and onto the spline, consequently when it gets to the fingers what is actually touching is the outer ring of the bearing and it's just grinding away. It is so skewed that I doesn't straighten itself up to run flush on the clutch fingers.

I then investigated the pressure plate itself. It's a clutch industries/RPM heavy duty (for a 2JZGE). When fully bolted to the flywheel (from Xtreme clutch) the spring fingers are virtually flat. Surely this isn't right is it? that would mean that to disengage the clutch the fingers would have to be pushed past centre. And I certainly can't imagine that the shape of the throw out bearing would allow this to much of an extent.

So, I guess my question at the end of the day is, should the fingers be flat, and if so, why is my bearing (that came with the clutch kit) not captive on the input shaft right up to when it touches the clutch fingers.

I have just bought an OEM clutch kit to fit up and see if I get the same result, but at first inspection, they don't look much different at all.

[Hipsi]

i've taken some measurements and think I may have discovered a possible issue. the nose of the input shaft only goes into the spiggot bearing by about 7mm. there's another 17mm or so until it touches the back of the crank. being that it's an ebay bell housing I'm wondering if it's maybe around 10mm too deep and thus not mounting the gearbox close enough?

[assassin10000]

Could be. The bellhousing should be 6 3/8" thick for a W58. If it's thicker than that there's your issue. You can get away with welding an extension on the back of the throw out bearing retainer/collar, or sourcing one that's longer from a hilux (or so I've heard).

Andrew

["Z" UTE]

I utilised a 2JZ-GE bellhousing with the W box, had a HiLux clutch and pressure plate, no drama's like you have here. However in another conversion where there was a 10mm adapter plate between the bellhousing and block, I had a throwout bearing reach issue. Solved by purchasing a throwout bearing for Landcruiser with a dual mass flywheel. These have an extension which would eliminate the gap you speak of.

cheers Chuck.

[Hipsi]

what really bothers me is the fingers on the pressure plate are dead flat when the bolts are tightened right up. Surely this doesn't give them anymore, or much more movement. the flywheel I notice has a slightly raised surface where the clutch plate goes. this would be pressing the plate further into the pressure plate housing. Does the factory flywheel have this same raised surface?

Do you remember what Landcruiser it was?

[midnight_purple_GA70]

it wouldnt happen to be a dellows bellhousing would it?

if so and you are using toyota clutchfork and throwout bearing ide hazzard a guess to that being the problem...

ive had to switch to a dellow clutch fork and throwout bearing after my pivot ball snapped...

when the pivot ball snapped i noticed the throw out bearing had been grinded away on one side...

also had an intermittent radial noise but seemed to go away after a few times the motor and clutch had been used

["Z" UTE]

?

Do you remember what Landcruiser it was?

Mate, I just went along to my local clutch and brake place, and we started looking through the catalogue for a bearing with a cup extension up front. All I remeber is the guy saying that it to suit a dual mass flywheel. The catalogue gives all dimensions, go to a clutch supplier, take your throwout bearing along and go from there.

The fact that the fingerers are flat indicates that there is a certain amount of pressure being applied to the clutch plate. The raised section on the flywheel that the clutch plate bears on is quite normal. How thick is the clutch plate?

cheers Chuck.

[Hipsi]

it's a ks racing bellhousing, from taiwan or somewhere like that. I'm using a toyota fork ad pivot ball. i've just mounted the pressure plate with some spacers (washers) behind it to get the fingers to stand up a bit. Will put it back together like that and see what happens.

[midnight_purple_GA70]

have you got the pivot ball too far in or out?

[Hipsi]

pivot ball seems right

[allencr]

The face of the bearing that contacts the spring fingers should be curved & have a radius & work fine, not a flat face like those that contact levers with a radius on them.

pivot ball seems right

Adjusted so that the lever would be at about 90 degrees when the clutch is half-way disengaged/pushed in?

[Hipsi]

Okay it's back together and working nicely. Changes much more smoothly than it did before and no noise, Nor the horrible vibration it had before. I even am able to use the original slave pushrod instead of the dodgy one I made up because it had to be 3 times longer