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6 speed 6th gear crunch


Trowter

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Recently purchased a 2004 manual H6 Legacy. Not long after buying it, it has developed a small crunch sound when changing into 6th gear. It's not a full on gear grinding sound and it's not hard to engage the gear or anything. I had a mechanic have a quick drive of it, he thinks it could be something to do with selectors, can't be sure though without actually putting it up on the hoist to have a look.

 

Just wondering if anyone here has had any experience with a similar problem. I purchased it from a dealer and was given a 'free' mechanical warranty so I will likely follow up the problem through them, would like to know what sort of problem I'm facing though.

 

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31 minutes ago, IZichard said:

 

How do you re-bed a synchro? I've never heard of this.

I can see this going pear-shaped fast lol.

 

Drive along, 50k or so should be fine. Pop it into neutral, and with the clutch pedal out, gently try putting it into the gear with the issue. Not hard enough to get graunching noises though. Do this a couple of times then just drive as normal. Note that this is quite harsh on the synchro ring, so if it doesn't work in the first few tries, don't continue. A gearbox oil change could be beneficial too.

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10 minutes ago, boostin said:

I can see this going pear-shaped fast lol.

 

Drive along, 50k or so should be fine. Pop it into neutral, and with the clutch pedal out, gently try putting it into the gear with the issue. Not hard enough to get graunching noises though. Do this a couple of times then just drive as normal. Note that this is quite harsh on the synchro ring, so if it doesn't work in the first few tries, don't continue. A gearbox oil change could be beneficial too.

Let the clutch out then keep applying pressure until the grinding stops, I understand. I'll try it tomorrow.

 

 

 

 

 

:P

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10 minutes ago, boostin said:

Not grinding. If it starts grinding you've gone too hard. And no, I'm not taking the piss.

 

As ichi ban said its done with feel. Some people understand that others dont hence the procedure never being posted publicly on here.

And also it wont fix a F***ed synchro just like radiator seal wont fix a completely F***ed headgasket.

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Just now, boostin said:

To be honest, I don't think I've had to do it for 5 or 6 years now. Maybe oils have improved?

 

Ive done it to a few used TY752/754 boxes with good results. I would blame driver error and its more pre 2000 that have that particular driver type...

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