'box full of woe

Post by **rupert** » Sat Oct 02, 2004 8:26 pm

Hi Guys,
I have managed to get a new problem with Molly and I wondered if you could help.

Last time I took her out, a serious rattling started in 3rd gear (and only 3rd) it sounds like the something fouling with a cog. Has anyone heard of this before? the 'box is about 8 years old (since re-con) and has about 40k miles on it.

I have a couple of "unknown" spare boxes, one of which I'm using to learn about gearboxes and I may just chuck the other in to see what happens.

Any advice gratefully apreciated.

Rupert

Post by **rupert** » Wed Oct 06, 2004 10:59 pm

found what the problem was ....

a big chunk of 3rd seems to be at the bottom of the box.

Drive it like you stole it?

Nah - drive it like its you that's got to fork out for a new gearbox!

Post by **Chris Morley** » Thu Oct 07, 2004 1:45 am

Can't really tell from that picture - is the cog missing teeth? It might soldier on for a while if you can get the broken bits out.

It's a lot of work to change a gearbox - I would get an expert opinion on the condition of another one before putting it in! Chances are it was knackered when it was removed.

Post by **rupert** » Thu Oct 07, 2004 7:49 am

yeah, two teeth on third are missing. Its making a really nast sound in 3rd which is probably messing up the gear it is meshing with (not sure what the name is). I recon that if I put one of the spare gearboxes in, I can rebuild this (good) one at my leisure. What are the checks to do on a gearbox to see if it is any good?
I certainly can't afford the £300 inc vat for another reconditioned one. If I was going to spend that cash, it would be on a type 9 conversion and I don't have a spare £600!

Rupert

Post by **Alec** » Thu Oct 07, 2004 8:07 am

Hello Rupert,
check for excessive play on the input and out put shafts of your spare.
Have a lookk at the state of the gears, as far as possible and ensure that all gears select. That way you have half a chance that your spare is useable.

Alec

Post by **rayofleamington** » Thu Oct 07, 2004 8:36 am

Checking the free play is a tough job. Unless you have a know 'good' box and a known 'bad' box net to each other it is pretty tough to know what is ok.
Generally there will be a 'bit' of slack on the input shaft but if you spin it by hand in 1st gear and it sounds a bit more graunchy than normal that is not a good sign....
That probably doesn't help

Post by **Alec** » Thu Oct 07, 2004 9:10 am

Hello Ray,
yes, but a lot of movement would not be encouraging, but the other choices are to overhaul and fit a spare or buy a reconditioned gearbox.
If on the other hand there is little slack, it's worth taking a chance and fitting it. Subjective, I know.

Alec

Post by **turbominor** » Fri Oct 08, 2004 8:20 pm

out of interest what engine have you got/ strange to see two teath missing..

I only ask as my tuned 1275 is tearing her box to bits