S2000 Under The Hood S2000 Technical and Mechanical discussions.

Car moves when in neutral and shifts grind

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Old 09-17-2004, 08:08 PM
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wow pedal you must have a lot of trust in the guy you let borrow your s2k!!
Old 09-19-2004, 08:41 AM
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Well, car's back and shifting fine. Turns out that the borrower decided to change the transmission fluid on his own. Apparently there was a leak after he put everything back together; the transmission fluid gradually dribbled away until shifts started grinding. I didn't think to ask, but I'd bet $10 that he didn't bother replacing the crush washer when he changed the fluid. Replacing the fluid (and the washer) fixed the problem.

I have no idea what caused the creeping in neutral, but since I haven't seen it since I got the car back, I'm going to follow alexf20c's advice, grit my teeth, and try my damnedest not to think about it.

Steve
Old 09-19-2004, 01:15 PM
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Don't most motorcycles use wet clutches? If so, I can see where there would be a bit of the fluid "lockup" that is the principal behind torque converters in auto trannies. Beyond a certain velocity and waveshape, the fluid becomes very close to being a solid in its performance. (simplistic terms - please no ME's squawking at a brother's layman terminology).
Old 09-19-2004, 04:30 PM
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Neutral creep is a transmission problem. Creep with the clutch on the floor while in gear is a clutch problem.

I would say drive it till it breaks. I once had my tranny rebuilt (in a VW Bug to put in different gear ratios) and the shop forgot to put oil in the tranny. I drove it for about 5 miles at highway speeds, exited the Interstate, and had a heck of a time getting it out of gear. Once I figured out it had no lube, I filled it up and drove it gently for a few miles. After that it was fine and I'm sure I put 75k to 100k miles on it.
Old 09-19-2004, 05:16 PM
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Originally Posted by Road Rage,Sep 19 2004, 03:15 PM
Don't most motorcycles use wet clutches?
I think you are correct. However, I was using the M/C example also with the gearbox in neutral, clutch out and kicking it as an similar comparison.
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