A few clutch questions

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Bigkenny, Jun 1, 2012.

  1. Bigkenny

    Bigkenny Bobtail Member

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    May 31, 2012
    Wyoming
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    Putting a new clutch on my old KW and I noticed that the manual does NOT say anything about torque specs for the 8 clutch pressure plate bolts that go to the flywheel. The 8 bolts are 7/16" -14 x2.5" so I'd imagine they can't take too much torque, anybody know the specs?

    Also, on the new clutch assembly there are two small blocks of wood wedged between the pressure plate and the throwout bearing. Do I take these out before the motor gets stabbed back in or does that happen when we step on the clutch for the first time?
     
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  3. bender

    bender Road Train Member

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    Don't Kid Yourself
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    55 ft lbs on the bolts. Leave the blocks in, they'll fall out on their own when you bolt up the clutch.
     
  4. truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    I belive 75 foot pounds for the bolts in a star pattern and the blocks of wood are there to help with the trans install by keeping the throw out bearing centered they will fall out when you depress the clutch the first time.if you don't grease your own truck you should remove the remote throwout bearing grease line in my opinion.I've seen way to many ruined clutch brakes from over greasing.also will ruin the throwout bearing without grease so make sure you grease it your self to male sure it gets greaswd
     
  5. Bigkenny

    Bigkenny Bobtail Member

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    May 31, 2012
    Wyoming
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    The old clutch had a grease line but the new one just has a zirc, should be fun to grease that one up!

    So it sounds like somewhere between 55-75lbs for the torque? My wrench goes to 150lbs so that should be no problem.
     
  6. black_dog106

    black_dog106 Road Train Member

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    Mar 29, 2009
    MA
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    As truckmechanic said, if you grease the truck yourself, do yourself a favor and run a grease line down through the inspection cover.
     
  7. bender

    bender Road Train Member

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    Jul 20, 2010
    Don't Kid Yourself
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    Torque on a 7/16 grade 8 bolt can be 40-60 ft pounds. The blocks are used on the clutch so you can bolt the clutch up without using longer than standard length mounting bolts to reach the bolt holes.

    You can transfer your grease hose from your old clutch to new clutch if it's in good shape.
     
  8. pop-a-top

    pop-a-top Bobtail Member

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    Jan 15, 2012
    northeast ark
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    my manuall has a chart in the front for torque specs. when they are not specified in the preceeduer part
     
  9. country29

    country29 Medium Load Member

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    Feb 27, 2010
    Arkansas
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    well I use my snapon mg325 3/8" air impact to run the bolts in, run em down till it hammers a couple times and it is gudentite! I do this on a daily basis on clutch jobs, never had a bolt break or come loose(knocking on wood profusely!) just my .02 but i dont know anything, I'm a dumb ole diesel mechanic.
     
    truckmechanic Thanks this.
  10. Gear head

    Gear head Medium Load Member

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    Apr 1, 2012
    Belair,md
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    The tourque is 55ftlbs blocks hold clutch released for alignment with lineup tool. Leave lineup tool in until u torque clutch then u can remove them.i like removing them so when u go to stab trans. The cluch plates can't move indepently while your moving the head shaft lined up with cluch splines.
     
  11. Bigkenny

    Bigkenny Bobtail Member

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    May 31, 2012
    Wyoming
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    Got the everything together with the new clutch and have it installed into the truck but I'm having issues. Went to go hook the linkage up then depress the pedal for the first time and the linkage underneath the truck just bent. While looking thru the inspection hole I can see the clutch is in the proper position, the clutch 'forks' are at the correct spot on the throwout bearing and the blocks of wood are still in place. Any ideas on what I might have done wrong?

    I'm thinking that the issue has to do with the wood blocks, can I stick a crow bar or pry bar between the bearing and pressure plate to release pressure on the blocks or is that too much pressure in such a little spot? Thanks for the help.
     
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