spikemooner
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| posted on 28/6/10 at 02:02 PM |
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Weird Type 9 Gearbox Problem... Any Ideas?
What do you reckon…. I’ve got problems with the Type 9 gearbox in my x-flow locost. It’s always been quiet and had a nice smooth gear change. However
that all changed when I took it out last week, briefly… I can use 1st 2nd 3rd and 4th for as long as I like without any undue noise or selection
problems. It goes into 5th nicely, but if it’s left in that gear for any length of time (30+ seconds’ish) it causes a gear selection problem. From 5th
it comes back to neutral nicely, but then the gear lever ‘locks solid’. It eases (after 20 seconds or so) and I can get it into 3rd and 4th, and after
another few seconds it eases further to give me all the gears again. And then it’s ‘back to normal’… I can use 1st – 4th without a hint of a problem
for as long as I want, but if I go back into 5th it locks-up again. I’ve checked that the clutch is releasing properly, and that the gearbox if full
of the right oil. I’ve bypassed the gadget bolted to the top of the gearbox (…the ‘auxiliary remote’ that moves the gear stick back a few inches) and
the problem still exists. It really looks like it might be caused by something deep in the bowels of the gearbox. Aside from this ‘5th gear thing’ it
runs really well and I’m reluctant to just ditch the gearbox and change it for an ‘unknown quantity’ replacement. Has anyone heard of this sort of
thing before, or has any ideas? Any comments or advice would be very greatly appreciated. Many thanks.
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snapper
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| posted on 28/6/10 at 02:22 PM |
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sounds like synchromesh baulk rings, usualy a problem in 3rd and 4th, difficulty in disengauging, worst case is the box jammed in gear, sounds like
you are close to complete failer, worth taking the top cover off, it could be as simple as the gear selector roll pin dropping half way out locking
the gear lever.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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spikemooner
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| posted on 28/6/10 at 02:30 PM |
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Thanks. I was afraid of that. I guess there's nothing else for it but to take the car off-the-road for a while, get the gearbox out and have a
look (...never happens when it's raining does-it... I'm going to miss all this luvverly weather). Thanks again.
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mcerd1
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| posted on 28/6/10 at 02:56 PM |
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BGH do HD baulk rings for 3rd & 4th in there top spec boxes to avoid this problem:
linky
[Edited on 28/6/2010 by mcerd1]
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spikemooner
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| posted on 28/6/10 at 03:46 PM |
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Many thanks. The engine is tuned to give around 135bhp at 7000rpm so perhaps I should think about beefing-up the gearbox. Next job... as soon as I get
a moment... will be to open her up and have a look (I will post some pics when I have found the problem). Thanks again.
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mcerd1
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| posted on 28/6/10 at 05:05 PM |
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well even BGH say the standard box is good for 145bhp / 145ft.lb - so maybe it just needs to be a good standard one....
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jacko
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| posted on 28/6/10 at 06:44 PM |
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Find a s/hand box and have a good summer 
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spikemooner
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| posted on 28/6/10 at 07:41 PM |
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Thanks guys... I'm going to go for a second-hand replacement to keep me on the road while I have a go at the 'dodgy one'. So, ebay
here I come!
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rusty nuts
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| posted on 28/6/10 at 08:23 PM |
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One of the best mods that I have done to my car was a BGH box with the higher first gear, well worth the money it cost. My car has a similar spec to
yours
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spikemooner
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| posted on 29/6/10 at 11:42 AM |
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Yep, that standard 1st gear ratio is a real 'pain'. Thanks for the feedback on the BGH unit, it sounds ideal (… with a 'wife & 2 kids' involved, £575 would involve some 'heavy-duty' negotiation though!)
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spikemooner
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| posted on 5/8/10 at 02:53 PM |
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Just a quick update. I've replaced the gearbox with a really good 2nd hand unit and all's fine. As for the dodgy 'box' I have
stripped it, and cannot find anything wrong. Nothing's 'broke' and it's not badly worn. However, with a bit of fiddling-about
I can sort of replicate the problem. There’s a 5th gear selector locking plate on the RHS of the rear casing. This has some adjustment, and if
it's not 'just right' it allows the gear stick to move front to back, but not left to right. I guess that this might have been the
source of my problem. Anyway, I'm going to rebuild the box and keep it a spare. If anyone gets the same problem, it's probably worth
having a go at adjusting this lock-plate (…can be done with the box in the car)... before stripping it out.
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