bmking16 Posted July 1, 2012 Share Posted July 1, 2012 I noticed when I got in the truck a few weeks ago that the free play was almost to the floor in the truck, so me and my brother adjusted the clutch and brought the free play back to 1 inch from the top. Got in yesterday and noticed there was a huge amount of free play again so we readjusted and brought it back to the 1 inch. We took it for about a 5 mile ride and notice we gained and inch of free play again. The truck is shifting fine and no smell of burning clutch. Also checked the clutch cable and all looks well there too. Any ideas why this is happening, it just started doing this. I have a 1987 RW613 Superliner with a T2090 trans. Quote Link to comment https://www.bigmacktrucks.com/topic/25959-clutch-free-play/ Share on other sites More sharing options...
theakerstwo Posted July 4, 2012 Share Posted July 4, 2012 For the fun of it check the crank shaft end play. Easy to do. Pry the front pulley forward and then backwards.About 15 to .020 if specs. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/25959-clutch-free-play/#findComment-126822 Share on other sites More sharing options...
Rob Posted July 4, 2012 Share Posted July 4, 2012 As Glenn stated. That crankshaft end clearance if much greater is multiplied several fold by the clutch linkage pivot points. If your crankshaft is "walking" in the block, either the thrust faces are worn on the mains, or thrust faces on the crankshaft are worn. By design, when the throttle is applied the crankshaft tries to push towards the rear of the engine exhibiting rubbing action on the thrust faces.A crank kit may be in order.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/25959-clutch-free-play/#findComment-126824 Share on other sites More sharing options...
Bollweevil Posted July 4, 2012 Share Posted July 4, 2012 Are you re locking the bull ring properly? If it has the PUSH to unlock adjuster, the adjuster might be the problem itself. If left unlocked the bull ring will screw itself out every time you push the clutch. Sometimes to the point that if stopped in gear, the truck will run out from under you. Quote Link to comment https://www.bigmacktrucks.com/topic/25959-clutch-free-play/#findComment-126827 Share on other sites More sharing options...
bmking16 Posted July 5, 2012 Author Share Posted July 5, 2012 Are you re locking the bull ring properly? If it has the PUSH to unlock adjuster, the adjuster might be the problem itself. If left unlocked the bull ring will screw itself out every time you push the clutch. Sometimes to the point that if stopped in gear, the truck will run out from under you.Thanks guys! it was actually the adjuster itself, we pulled it out and found that it was only locking one way. Got a new one from the local Mack dealer and all is well again! Quote Link to comment https://www.bigmacktrucks.com/topic/25959-clutch-free-play/#findComment-127068 Share on other sites More sharing options...
David Posted July 6, 2012 Share Posted July 6, 2012 Sometimes you just get lucky. Quote Link to comment https://www.bigmacktrucks.com/topic/25959-clutch-free-play/#findComment-127080 Share on other sites More sharing options...
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