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post #193 of 215 (permalink) Old 06-03-2019, 03:58 PM Thread Starter
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nah it dont seem to have free play when i pushed it back in there was pressure on the rod to even get it back in.


2003 f250 extracab
4.2 litre mwm sprint diesel soon to Be 12v 6bt p-pump,zf6 speed. Aiming for 350hp and 800 od nm
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post #194 of 215 (permalink) Old 06-03-2019, 09:22 PM
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How far will it push back in?
Missing a return spring?
Is there free play at the rod between the pedal and master cylinder?
Cheers Steve

86 F350 CC dually, RTO610, 3.32 final gears 93 5.9 (ex F600) basically stock,THD pin, tuning in progress
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post #195 of 215 (permalink) Old 06-04-2019, 01:29 AM Thread Starter
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So when i pull the slave cylinder out of the gearbox the rod can push way back into the slave cylinder. The rod when out off gearbox is nice and free not stuck or hard to pull out. Whats odd is that it held up fine 500 odd kms,then just started slipping. I tested to see if the slave was getting stuck and riding on the clutch fork which would in turn leave a little pressure on the pressure plate. I took it for an easy drive to warm it up and left clutch out popped it out of gear. Turned the truck off jumped under and pulled the slave out easy as normal,i gather nothing is getting stuck or its not holding pressure on the fork at all. Stumped now ive got no idea. I guess its box out time...

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post #196 of 215 (permalink) Old 06-04-2019, 08:53 AM
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Have you checked the pedal rod for free play? if it is hanging it will not let the slave bleed off.
Initially you said it was hard to push the rod back into the slave.
You could try making a slightly shorter rod out of a bolt and see if it makes any difference.
When letting the pedal out how far off the floor does it come before the clutch starts to bite?

Cheers Steve

86 F350 CC dually, RTO610, 3.32 final gears 93 5.9 (ex F600) basically stock,THD pin, tuning in progress
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post #197 of 215 (permalink) Old 06-04-2019, 09:33 AM
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Adjusting the rod length isn't going to effect clutch slippage.
Time to pull the box and find where oil is getting on the disc.

Mine-04 F-450 SCFB 4X4 drw,5.9 12v 215 Ppump,ZF 6,KYclutch,KDP fixed,gauges,5x12's,15deg,3k GSK,60#,AFC Live, Super B single,Pusher intake,D celebrator brake,07 coil spring front conversion.
Her's-18 F-150 STX SC, 4x4, 5.0
Toy- 64 Fairlane, future 406FE, 3 Holley 2bbls, 4 spd
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post #198 of 215 (permalink) Old 06-04-2019, 10:54 AM
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If the rod is too long and holding pressure on the TOB it can cause slippage.
Easier to check that before yanking the box,
Have not seen where he has oil on the disc, only there is oil between the engine and flywheel/clutch housing
Cheers Steve

86 F350 CC dually, RTO610, 3.32 final gears 93 5.9 (ex F600) basically stock,THD pin, tuning in progress
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post #199 of 215 (permalink) Old 06-04-2019, 03:11 PM Thread Starter
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yeah im hoping the disc has no oil on it but i guess pulling the box is the only way im going to find out.

the rod length is apparently correct and im hoping if it was wrong it would be slipping from the get go not 500 od kms in. But its not a hard thing to test so i will try that also. Thanks fellas

2003 f250 extracab
4.2 litre mwm sprint diesel soon to Be 12v 6bt p-pump,zf6 speed. Aiming for 350hp and 800 od nm
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post #200 of 215 (permalink) Old 06-04-2019, 05:49 PM
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If the rod was long enough to put enough pressure in the plate to cause the clutch to slip, one wouldn't be able to install the clutch slave cylinder by hand.
A rear main seal will be slung out by the flywheel and usually doesn't get much oil on the clutch.
A leaking trans input shaft seal will allow oil to leak directly onto the clutch disc.
I've had a leaking trans seal cause clutch slippage on a high performance car and a couple of my farm tractors.

Mine-04 F-450 SCFB 4X4 drw,5.9 12v 215 Ppump,ZF 6,KYclutch,KDP fixed,gauges,5x12's,15deg,3k GSK,60#,AFC Live, Super B single,Pusher intake,D celebrator brake,07 coil spring front conversion.
Her's-18 F-150 STX SC, 4x4, 5.0
Toy- 64 Fairlane, future 406FE, 3 Holley 2bbls, 4 spd
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post #201 of 215 (permalink) Old 06-04-2019, 10:41 PM Thread Starter
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Quote:
Originally Posted by Destroked 450 View Post
If the rod was long enough to put enough pressure in the plate to cause the clutch to slip, one wouldn't be able to install the clutch slave cylinder by hand.
A rear main seal will be slung out by the flywheel and usually doesn't get much oil on the clutch.
A leaking trans input shaft seal will allow oil to leak directly onto the clutch disc.
I've had a leaking trans seal cause clutch slippage on a high performance car and a couple of my farm tractors.

you know what i had this very thought the other night laying in bed wondering if the input shaft seal was shot.. ID reckon its gearbox out job for sure. if this seal is shot i hope its not wrecked the clutch plate. half organic half feramic so fingers crossed it dries out

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post #202 of 215 (permalink) Old 06-05-2019, 06:08 PM
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Just a little oil on the feramic side will cause the clutch to slip like crazy, as long as the organic side isn't oil soaked it'll be ok.
If you find it does have oil on the clutch give it a good cleaning with brake clean spray cleaner.

Mine-04 F-450 SCFB 4X4 drw,5.9 12v 215 Ppump,ZF 6,KYclutch,KDP fixed,gauges,5x12's,15deg,3k GSK,60#,AFC Live, Super B single,Pusher intake,D celebrator brake,07 coil spring front conversion.
Her's-18 F-150 STX SC, 4x4, 5.0
Toy- 64 Fairlane, future 406FE, 3 Holley 2bbls, 4 spd
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post #203 of 215 (permalink) Old 06-06-2019, 12:32 AM Thread Starter
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Im looking pulling the box asap well on my next run of 5 or more days off.

2003 f250 extracab
4.2 litre mwm sprint diesel soon to Be 12v 6bt p-pump,zf6 speed. Aiming for 350hp and 800 od nm
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post #204 of 215 (permalink) Old 06-12-2019, 12:11 AM Thread Starter
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If you are only pushing 240HP, then that clutch is more than likely to
aggressive for you application.
It is rated for 475HP and if you are running more at stock power then
the clutch wont seat in correctly and begin to slip like it has.

Your best option would be to switch to a full organic clutch kit instead
of the OFE

This is southbends response to my clutch slipping.. What does everyone reckon

2003 f250 extracab
4.2 litre mwm sprint diesel soon to Be 12v 6bt p-pump,zf6 speed. Aiming for 350hp and 800 od nm
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