general syncro query

Post by **Mercdoctor** » 15 May 2006, 18:44

Nice and helpful on here isn't it.....oh I do love a friendly club .........

....................................................OF TO CRUCH MY GEARBOX NOW

Post by **Simon Baxter** » 15 May 2006, 21:13

Post by **Horza** » 15 May 2006, 21:31

Whatever.

I've seen the friendly helpful people of this club being friendly and helpful, giving of themselves, doing stuff for nothing, giving away their carefully horded spares, dropping in unexpectedly with overalls and spanners, driving accross the country to help other folk off their arses when it counts. Giver and recipient are as likely to be brand new and never heard of as they are to be old and long of tooth. It's funny because it's often those that end up on here being grumpy or grumped at that are most likely to lend a hand when it's needed.

Life would be boring if everyone smiled all the time and you would have to suspect that most were just putting on an act.

Post by **nickstruck** » 16 May 2006, 06:56

Surely the gears, synchro rings (yes synchro has an h here), sliders and general mechanism is identical to the 2WD gearbox so the shifting shouldn't be any different to that of a Syncro...

Not had any problems with shifting in my van. Maybe try a different gearbox oil Harryman?

Nick

Post by **Ye Olde Syncrospares** » 16 May 2006, 08:05

what it boils down to if its old and f!$%ed it crunches if its not it doesnt,got 13 syncros here and only 2 grind and crunch in the first few gear changes,like its been said it wasnt designed to crunch,cj.

Post by **syncroandy** » 16 May 2006, 09:53

CJ, that nearly-new box I got off you last year with only 13,000 miles on it is slow into 2nd in cold weather and will crunch if handled carelessly.

However from what I've heard previously this is normal on these boxes and I'm not really concerned about it.

At some point I may try MT90 but as it's only a problem 3 months of the year that I can work around, there's probably better things I can do with my cash..

Post by **HarryMann** » 17 May 2006, 10:56

Maybe try a different gearbox oil Harryman?

If you read the Wiki link again carefully...

Wiki on T25 gearbox reluctance

you'd see that is exactly what one of the workarounds suggests and that it is not Syncro specific, or even T25 specific!

and Redline would not research, develop, market and advertise an oil specifically for this sort of problem if there wasn't a general problem with many boxes, across a wide vintage.

Would they ?

I've been driving vehicles for 40 years, and was stripping down gearboxes over 35 years ago - I don't do it now but take a peek now and again - they haven't changed much as far as I can see. Synchro baulk rings are much the same, as are the teeth on the dog clutches they synchronise.

It's a well known engineering compromise between gear size and their consequent rotational inertias versus the frictional torque generated on the hub faces required to synchronise their speeds quickly - and whilst one might think a more viscous oil would help, its film thickness prevents this - yet another compromise. Design engineering is usually all about carefully controlled and calculated compromises.
N.B. The early 850 minis (1959, straight levers) did this from new, or within a month or two, and had to be re-designed pretty sharpish.

All I was saying is that a box being slow when cold means if forced it will refuse or crunch the change, and is NOT something that condemns it outright... and in fact is quite common, witness why the Wiki article was written in the first place - to help members complaining about this.

I didn't drag this back up, I just made one straightforward comment based on FACT - why people can't accept it I just don't know - its engineering common-sense backed up by a lot of people saying it happens (even on nearly new boxes - allegedly)

Post by **HarryMann** » 17 May 2006, 11:04

This thread seems to have run its course now, everyone has had a fair crunch of the gears, believe what thoust wilt, but we're all going to be listening from now on as T25s pull away on those freezing mornings from a cold start - and the driver slips it effortlessly into 2nd gear ?

with tape recorders at the ready

Thread Closed

Post by **pimpdriver** » 23 May 2006, 15:33

Horza wrote:
My 2wd five speed box can be a little pig between 1st and 2nd when cold. It's been like that since I bought it.

Mine was a pig in the winter (2WD 5 speed), but now it is a bit warmer, it is fine again.

Steve

Post by **HarryMann** » 24 May 2006, 00:49

Thought this thread was locked

Anyway, mine is OK now too, its that last 10~15C before freezing point that slows the change so much.

Post by **pimpdriver** » 24 May 2006, 06:33

it isn't locked. The "icon" hasn't changed to the padlock symbol. I was jusy browsing through watching another argument brewing, and read something I thought I would reply to on page 2, and I thought my comment may be useful.

Who locks the threads? Moderators?

Steve

Post by **Mudlark** » 24 May 2006, 08:11

Funny that; it deffo was locked, but now its not