Effect of Internal gearbox part damage

[dabawei]

Hi,

Can the expert tell what is the effect of damage in internal part of the gear box on the movement/noise?

Tha damage as illustrated in picture links, below:

http://flic.kr/p/bHk5ig

http://flic.kr/p/buqhLs

http://flic.kr/p/buqhBq

And do I have to change it? (unfortunately I can't it locally )

[I Leak Oil]

Any non synchro box I've opened has similar conditions on 1st\reverse gears. Usually caused by the drive not double clutching while trying to shift. Could still work fine for a long time like that, no guarantee though. Since you already have them in hand (taken apart) just replace them.

[jumpmaster54]

Info on tranny synchro

What is the best way to swap out the synchro mesh gears so my IIa does not need double clutched?

Stan

[I Leak Oil]

Find a SIII gear box.

[jumpmaster54]

OK

is an SIII gearbox a direct bolt up to a 2.6 rover 6 cylinder?

[Jim-ME]

No you would have the switch the bell housing.
Jim

[dabawei]

Could still work fine for a long time like that,

What will be the drawback of running the gear with such damage? Noise in gear? Glitch in changing speed, any other?

Also, what is the story of double clatch!

[I Leak Oil]

The drawback is the gears aren't going to get better, only worse. They might be a little noisier but the real drawback is their increased chance of failure. Once the case hardening is gone you're into relatively softer metal and that doesn't make for healthy metal to metal contact.

Double clutching sychronizes the speed of the gears in the transmission with the engine RPM.
Basically you do this.
Tranny in first gear.
Push in clutch pedal
Put shifter lever in neutral
Let up on clutch pedal
Push in clutch pedal
Shift into 2nd gear
Do this quickly and smooth and you'll reduce or eliminate the engagment of first, second and reverse. Practice it with the motor off to get you're coordination down.

[yorker]

Hi,

And do I have to change it? (unfortunately I can't it locally )

You don't HAVE to change them but it is a LOT easier right now whle you have it all apart - you know?

It might delay your project a bit finding and ordering the parts but you might as well do it.

[dabawei]

Synchro gearbox

Hi,

Finally, I got another newest gearbox, which I believe it is synchro one, the manufacture year is 70s. By this I will solve the issue of no spare part as well double clutch (two birds by one stone ).

http://www.flickr.com/photos/71577034@N08/7048142151

Will I gain more speed since the engine and gearbox are manufacture in 70s (petrol engine with 40 piston head)?

[east high]

What's a 40 piston head?

You'll get a bit more power if the new head has a higher compression ratio than your old head. You won't see any speed gains from the transmission that's for sure, just the ability to shift from first to second and second to first without double clutching.

[Les Parker]

Output ratios would be the same, so, if you take the lack of whine/noise from the errant gearbox into consideration, you may go faster due to the reduced (?) noise levels.

[antichrist]

Not only does the 6cyl take a shorter bell housing, the IIA and III have different clutches and clutch mechanisms so you'll have to deal with that as well.

[dabawei]

What's a 40 piston head?.

A little bigger piston head, new size will be 2.3 instead of 2.25 (WoW 0.05 extra, one more leg of horse )

[east high]

Oh.. okay. You're overboring the block. Got it.