Clutch slips or tranny slips? anyone know this trouble

Discussion in '40- & 55-Series Tech' started by RIDDLER, Jun 26, 2005.

  1. RIDDLER

    RIDDLER

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    OK I thought I had this problem solved.

    74 FJ40, 4 speed. F engine.

    A few oil leaks prior to rebuilt clutch had me thinking the clutch was worn out. We pulled the tranny and replaced the clutch with all new clutch parts, throwout bearing etc. Everything was good for a while.

    Then when the truck was in the shop for some welding work, a helpful mechanic helped me with a breather hose by capping it. Duh?

    As soon as it got warm again that engine started blowing oil out the front timing chain cover all over the passenger side of the engine. Found the problem and stopped the leak etc. But the oil made it to the clutch area through the hole by the flywheel.

    Now when warm on a hot day the clutch slips like crazy. Today it was about 75F and the entire family in the FJ40 (4 in 4 seats) it was slipping as bad as it ever has coming up a hill. I had to use 2nd gear in the 4 speed at 25 MPH to keep moving.

    Sorry for the long winded prelude...is this the clutch with excess oil that came in when I had the leak through the flywheel? Any way to solve this without pulling clutch again and cleaning?

    Or could this be the worn tranny that a buddy mentioned he thinks I have because he has heard some noise from the tranny hump??

    thanks

    Aaron
     
  2. bad_religion_au

    bad_religion_au

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    sounds likeslipping clutch...oil probably, perhaps leaking out fo the front of the tranny
     
  3. canadian bum

    canadian bum

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    The only way you have tranny slip is in an automatic. A manual is direct unless you have a gear ground off but then it would just slip all the time not whenever. Once your clutch disc gets oil on it, it is pretty much done for. Sorry to be the bearer of bad news but really there is no way to get the clutch clean without taking it out.
     
  4. texas77fj40

    texas77fj40

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    you really can't do much of anything to the clutch without pulling the tranny. but with a good tranny jack and a buddy it's a pretty simple job.
     
  5. norm

    norm

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    Check your slave cylinder adjustment and bleed any air that may be in the system. It may be wishful thinking, but it's not uncommon for a clutch to be adjusted so tight that it slips. Drive it around until it's slipping and see if you can wiggle the clutch fork. If it's tight, then try loosening it. You can take the inspection cover off and look inside to see if the clutch and pressure plate are oily. Another last ditch effort would be to spray the clutch off with some brake cleaner (with the clutch pedal depressed).

    Wasn't there a F1 race where someone came into the pits with a slipping clutch and the crew poured Coke on it and he went on to win the race? Maybe it was more a function of cooling the clutch rather than the sugar and phosphoric acid....
     
  6. norm

    norm

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  7. RIDDLER

    RIDDLER

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    thanks guys

    thanks guys.

    I will try these ideas. I may have to replace the clutch disk due to scoring?

    thanks

    Aaron
     
  8. burnt03

    burnt03

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    How can I check to see if my clutch is slipping? The cruiser sure does seem gutless going up hills and the compression is reasonable
     
  9. brian

    brian SILVER Star

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    4th gear clutch in
    rolling at 15-20mph
    rev engine to 1500-2000 rpm
    dump clutch

    one of two things will happen.
    the good: engine will instanty bog

    the bad:
    engine will slow, but not bog. depending how bad it is will vary this.
    this is easier to feel, than read.

    you should be able to clearly feel/ hear what's happening
     
  10. cruiserjunktion

    cruiserjunktion Cruiserjunktion@gmail.com Supporting Vendor GOLD Star

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    rear main seal?????
     
  11. GreenFJ40

    GreenFJ40

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    I was about to suggest rear main also. Did you replace while you did the clutch? Mine was leaky and would "shudder" in reverse a low idle, felt like the rear end was hopping.
     
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