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Author: Subject: Mechanical advice on gearbox fail
Fcck2000

posted on 18/1/13 at 05:00 PM Reply With Quote
Mechanical advice on gearbox fail

Hi

Not posted much I'm afraid and now on for advice..

C20XE engine, Ford type 9 gearbox and english none LSD differential is the spec.

Whilst on a recent track day my car threw a rod and locked up before going into the kitty litter. I've replaced the engine but upon driving the car has some issue with the gearbox, in first and reverse it feels like the gears are grinding and it wont pull away, if I try again it will drive as normal.

Just after any thoughts on why this would be and if the engine locking and the rear wheels still being driven by momentum would cause it.

Thanks for any thoughts
Paul

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jon200

posted on 18/1/13 at 05:12 PM Reply With Quote
Does it grind if you try to pull away in 2nd? It may be a clutch release fault.
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westf27

posted on 18/1/13 at 05:14 PM Reply With Quote
I would think its twisted a shaft inside the box.You could strip it but considering the relatively low cost of a box easiest to replace it with another.





555

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britishtrident

posted on 18/1/13 at 05:15 PM Reply With Quote
Selector problem it is in two gears at the same time ---





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Fcck2000

posted on 18/1/13 at 05:16 PM Reply With Quote
I've not tried but will try on Monday and report back, thanks for the post.

Paul

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Fcck2000

posted on 18/1/13 at 05:17 PM Reply With Quote
quote:
Originally posted by britishtrident
Selector problem it is in two gears at the same time ---


Does that not just lock the box solid?

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Fcck2000

posted on 18/1/13 at 05:28 PM Reply With Quote
quote:
Originally posted by westf27
I would think its twisted a shaft inside the box.You could strip it but considering the relatively low cost of a box easiest to replace it with another.


Guys thanks for your thoughts and keep them comin, Ive got to go out but will pick the posts back up tomorrow.

Thanks
Paul

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MikeRJ

posted on 18/1/13 at 06:10 PM Reply With Quote
Possibly broken a tooth or two in the box.
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Bare

posted on 18/1/13 at 11:28 PM Reply With Quote
Interesting puzzle. Possibly a bent selector could have the reverse gear contact 1st gear.. Causing horrific noises.
Also a chipped tooth on either first or reverse cogs would also cause some seriously disconcerting noises.
Doesn't take much tooth damage either to produce disproportionate noises.
Bin the thing and fit another..

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Fcck2000

posted on 19/1/13 at 12:03 AM Reply With Quote
quote:
Originally posted by Bare
Interesting puzzle. Possibly a bent selector could have the reverse gear contact 1st gear.. Causing horrific noises.
Also a chipped tooth on either first or reverse cogs would also cause some seriously disconcerting noises.
Doesn't take much tooth damage either to produce disproportionate noises.
Bin the thing and fit another..


Yes that's what I'm going to do, boxes are cheap enough.
The part I,m confused about is how the gearbox actually got damaged.

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snakebelly

posted on 19/1/13 at 06:56 AM Reply With Quote
Gearbox not designed to go from lots of rpm to 0 rpm in a split second !
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britishtrident

posted on 19/1/13 at 08:45 AM Reply With Quote
I wonder did you fit the spigot bearing in the end of the crankshaft ?





[I] “ What use our work, Bennet, if we cannot care for those we love? .”
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MikeRJ

posted on 19/1/13 at 11:55 AM Reply With Quote
quote:
Originally posted by Fcck2000
Yes that's what I'm going to do, boxes are cheap enough.
The part I,m confused about is how the gearbox actually got damaged.


When an engine locks up at speed, the peak stress on the gearbox (and the rest of the drivetrain) will be huge. Whatever was the weakest link has let go.

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Fcck2000

posted on 19/1/13 at 12:30 PM Reply With Quote
quote:
Originally posted by britishtrident
I wonder did you fit the spigot bearing in the end of the crankshaft ?


The new engine was a ready built engine so I never had to touch the crank. Or is the digit something that needs doing whilst say swapping a clutch?
I'm worried now...

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NS Dev

posted on 18/2/13 at 08:39 PM Reply With Quote
several things here......why did it throw a rod? XE's don't do that unless: they have no oil pressure, or they have standard rod bolts, or they were revved over 8000-8500rpm

Next, could it have been the gearbox that broke the engine?!??

A type 9's days are fairly numbered behind a decent XE!!





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ashg

posted on 18/2/13 at 11:11 PM Reply With Quote
better off with an r28 box off an omega if you ask me, bolts straight up, much stronger and feels a thousand times more refined to drive than the type 9

edit... and they weigh 11kg less than a type 9!

[Edited on 18/2/2013 by ashg]





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