givemethebighammer
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| posted on 13/11/05 at 03:28 PM |
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Type 9 gearbox looking inside
I've just taken the top cover off my second hand 2.8 capri gearbox. Everything turns smoothly, there is no obvious damage to any of the gears,
you can select every gear without problems, the gear teeth don't look a "burned blue" colour nor does the inside of the box smell
burned, no play on the input shaft (other than a little up and down, which I understand is normal) and the box had lots of oil in it when I bought
it.
With my (very) limited knowledge I think I have a reasonable chance that this will be OK. Anything I have missed or other things I need to check ?
thanks
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NS Dev
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| posted on 13/11/05 at 03:33 PM |
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sounds ok to me.
They rarely break in a manner that you would see obviously anyway.
Synchro rings splitting is quite common, but you can't really see that without dismantling the mainshaft, and the bearings can get noisy, again
you need to run it to know, but in either case they are not expensive to sort.
It should be fine, best to put it in the car and find out.
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givemethebighammer
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| posted on 13/11/05 at 03:42 PM |
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Thanks Nat, I've decided to order a spacer from Cat**ham to get round the long input shaft issue. I think have enough movement spare on the
prop to accomodate the 30mm extra and straightening the gearstick (still has bend in it as original sierra) will ensure it still comes up in the same
place.
Just trying to decide on a bellhousing now. The RS2000 ally one is much lighter than the standard sierra cast one. But they are not cheap and the
cheap second hand ones I have looked at have been cracked or repaired from being cracked. What causes them to crack ? My first thought would be
someone dropping them the second would be vibration or torsional stress ?
[Edited on 13/11/05 by givemethebighammer]
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theconrodkid
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| posted on 13/11/05 at 05:19 PM |
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empty the oil out,it may have some gold coloured filings in it from baulk rings,thats ok but any big bits is a worry
who cares who wins
pass the pork pies
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JoelP
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| posted on 13/11/05 at 08:10 PM |
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big bits getting between cogs was what blew mine!
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givemethebighammer
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| posted on 13/11/05 at 08:44 PM |
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 Big bits ?
How big is big ? (not emptied oil yet but want to know what to look for)
thanks
[Edited on 13/11/05 by givemethebighammer]
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NS Dev
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| posted on 14/11/05 at 12:46 AM |
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Pretty rare, I wouldn't worry!
As conrod says, worth having a peek at the old oil to look for gold bits, anything much bigger than sugar grain size would be a concern but I have
never seen anything like that on a type 9. Usually the baulk rings (the bronze bits that lead to the gold bits in the oil!) just split at the edge of
the blocker bar slots if you slam the gear in too fast with a quickshift, which is why we used to use steel baulk rings on the rally car boxes before
going to dog-engaged. The steel ones are not worth the bloody hassle, they never synch right anyway.
The typical failure on a type 9 is the bearings or the input shaft drop gear. Bearings are by far the most common though, and you won't know
until you run it.
Even when they are noisy though they will still go for a fair while.
Oh yes, and expect to find a few synchro hub (steel, not bronze) teeth in the oil, they always lose a few, think I have found 7 in the oil before with
no apparent shifty problems from the box. These are the teeth attached to the side of the driven gears on the mainshaft. The synchro sleeves slide
first over the baulk rings, pushing them against the cones on the ends of the synchro hubs to spin the hub up, then once the hub is up to speed the
sleeve can continue along over the teeth on the synchro hub and engage the gear properly. "missing" gears or changing too fast either
mauls the baulk rings (by splitting them or wearing them badly) or knocks teeth off the edge of the synchro hub (driven gear) through not being fully
synchronised when the sleeve meets the edge of the hub. (there you go, how a synchro box works in clear as mud fashion!)
[Edited on 14/11/05 by NS Dev]
[Edited on 14/11/05 by NS Dev]
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