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manual gearbox preventative maintenance

 
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Old 03-15-2012, 12:33 AM
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manual gearbox preventative maintenance

Hey! I've been reading that preludes have a pretty common problem of 5th gear and reverse being problematic and requiring a new box.

Now is there anyway to prevent this other than changing fluid more often? will double clutching into 5th help prevent it or is it possible to happen anyway? I know stopping before going into reverse is also recommended.

Also I have managed to crunch 2nd in once with a super quick shift but generally never crunches even with quick shifts, was this a fluke? the syncro getting old? or do you think I just beat the syncro? what about clutch fluid?

thanks.
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Old 03-15-2012, 10:07 AM
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Re: manual gearbox preventative maintenance

What exactly is problematic? Grinding? Not going in? Popping outta gear? Need a littleee more info.
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Old 03-15-2012, 09:35 PM
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Re: manual gearbox preventative maintenance

Speed shifting into 2nd gear routinely kicks my ass and I grind the hell out of it and can't get it in gear til I drop the RPM. Pisses me off every time. BEST WAY is to shift slower, let those RPM's drop enough between shifts and keep it calm as much as possible. I'm not saying drop all the way down to idle. Hopefully you know what I mean.
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Old 03-15-2012, 09:39 PM
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Re: manual gearbox preventative maintenance

Changing the gearbox oil regularly and not slamming around the gears is the way to go. Double-clutching the 4-5 upshift won't help -- the synchros really don't come into play much on upshifts. IIRC, it's something about the shift fork alignment for 5th gear, but I might be wrong.

Reverse has no synchro (not to mention it's not designed to run backwards), so always stop before you shift to R. These aren't slushboxes.

Going into 2d, you probably beat the synchro. That said, any transmission will only change so fast -- the trick is to work with it to find that path and hit it every time. Speed shifting faster than the 'box is designed to go is just a way to slowly destroy it while not really going faster.

Use a good MTF -- the Honda fluid is pretty good, or you could use something a bit more exotic like RedLine MTF -- and keep the clutch fluid clean and bled. If you want, double-clutch the downshifts, but the real key is just to be nice to the 'box.
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Old 03-15-2012, 11:09 PM
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Re: manual gearbox preventative maintenance

I don't have a problem with any gears I was mainly just wondering if the 5th gear and reverse problem was syncro related and if it was worth double clutching or just going into gear slow.

Yeah I think I just beat the syncro, I've had toyotas and never could crunch it going into it too fast so I will just slow my shifts down, mainly asking because I plan on doing track work.

Just changed to honda mtf and it shifts so smooth.

thanks everyone.

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Old 03-16-2012, 09:17 PM
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Re: manual gearbox preventative maintenance

In most cases, you don't need to go through the whole routine of double-cltuching -- rev-matching is good enough, and doesn't slow your shift as much. I rev-match out of habit now, but the only time I really worry about double-clutch is if shifting into 2d under hard braking -- and that's mostly to keep myself from forcing the shift.
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Old 03-18-2012, 06:28 AM
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Re: manual gearbox preventative maintenance

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In most cases, you don't need to go through the whole routine of double-cltuching -- rev-matching is good enough, and doesn't slow your shift as much. I rev-match out of habit now, but the only time I really worry about double-clutch is if shifting into 2d under hard braking -- and that's mostly to keep myself from forcing the shift.
I usually ALWAYS rev match and heel and toe rev match out of habbit but double clutching can be a bit of a pain.

I guess the best way is to just keep up with your fluid and do it more often than 80k like Honda says + slow down shifts.
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Old 04-15-2014, 06:48 PM
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Re: manual gearbox preventative maintenance

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Originally Posted by Lindso View Post
Speed shifting into 2nd gear routinely kicks my ass and I grind the hell out of it and can't get it in gear til I drop the RPM. Pisses me off every time. BEST WAY is to shift slower, let those RPM's drop enough between shifts and keep it calm as much as possible. I'm not saying drop all the way down to idle. Hopefully you know what I mean.
I have the same problem into second, I find that the rev gap is further (closer to 2k) than the other gears (closer to 1k)... But hey! It's my first manual and I've only been driving it for about a week. So maybe I'm just n00b.
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