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Old 09-06-2008, 05:40 AM   #1
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Default Losi 8ight-t gear mesh?

I have had my truggy for a while and I recently ran a 2 hour race and my front pinion an spur got stripped? Before the race I put new bearings all around an I noticed when I took it apart there was a little play in the front,So I put the front back togather and had thepinion to the bearing with a little play an then I put the pinion coupler on against the bearing. The rear had about a 32nd of play and it looked perfect? I was wondering if someone could lmk what the proper way to set these up so I dont have any more problems? Thanks.
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Old 09-06-2008, 11:13 AM   #2
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Something could have loosend up moved during the race, stripping the spur gear. I have never seen a clutch bell strip, have seen the teeth break off though, usually caused by no enought lash between the two. I just sanwich a paper towel folded in half between the two without any problems, i put close to 10 gallond on my 8ight before i sold it couple days ago, never had any issues. hope that helps.

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Old 09-06-2008, 11:35 AM   #3
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Old 09-06-2008, 12:25 PM   #4
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Its the front pinion and spur (or is it called the ring gear?)that is on the front diff?
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Old 09-06-2008, 01:09 PM   #5
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Sometimes the gearbox gets worn & will need replaced. You can check this by installing the diff in the back half of the gearbox & checking the side to side play of the diff with the bearings seated in place. If there's noticeable side play you can take diff apart & put a shim between the bearing & ring gear. I use OFNA p/n10413. These are 8x10x0.3 shims. This will take up the slack & force the ring gear closer to the pinion. I have had to do this even with a new gearbox cover. Hope this helps.
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Old 09-06-2008, 01:47 PM   #6
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The couplers used to connect the CV shaft to the pinions (F/R) have a machined lip on them. Very small, like a shim that's already in place. These need to be up against the pinion bearings. That's what the "machined lip" is for. It will space itself away from the diff case enough for clearance. And it holds the pinion steady so it doesn't walk back and forth. If you leave this coupler loose, chassis flex will push and pull the pinion back and forth while you're on the track. This will be all kinds of bad for the ring and pinion.
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Old 09-06-2008, 11:41 PM   #7
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Proper way is to push the pinion with your thumb from the inside of the gear case up against the bearing then put the coupler all the way on and tighten down the coupler set screw with no play.
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Old 09-07-2008, 07:37 AM   #8
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Thanks guys, When I re-did the bearings in the gearbox I put the pinion against the bearing an then put the coupler against the bearing on the outside and I really think that is why I ruined it? the rear has about a 32nd of play and it looks perfect? I reasembled the new parts and I have about the same f/r now and I am going to keep a close eye on it?
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