6v Gearbox, 12v flywheel engine

[Boroboy63]

I have fitted a 1600 twin port to my 62 notch, which still has a 6v transaxle.
I clearanced the gearbox before I fitted the engine to make way for the larger flywheel, but I did not take enough material off. So as I fitted the engine, I could not get it in altogether, so I turned the engine over, until I could get the engine in a bit further, and then repeated this until I got the engine fitted.
Running the engine, there is no noise, but, driving it it is very noisy, I initially thought the diff was defective, noisy all the time, but especially on overrun.
I got the car registered here in Australia, and have driven it about 30 kms, without any change in the noise level!
I have removed the engine, to get the transaxle rebuilt, I am just thinking is there any possibility that the flywheel is still catching on the g/box? I repeat, it is completely noise free when the engine is running with the car stationary.
I have taken the engine and box out, in order to get the gearbox rebuilt, as I dont want to waste time putting the engine back in, and ending up back at the start!
Surely it would make a noise on tickover if the flywheel was catching?
If it only caught when I was driving surely I have done enough kms for it to have removed any material it was fouling on?
Thoughts would be appreciated, thanks in anticipation.

[Zwitterkafer]

If the flywheel was still catching the transmission housing, there would be further tell-tale metal dust in that area. Runout on the flywheel should be very small, so once there is enough clearance, it should be fine. Keep in mind that the mainshaft (and pinion shaft gears) are also spinning when idling while stationary. As a result, isn't the noise more likely a pinion shaft bearing or a differential problem? BTW, if you are still 6V, there exists a '66 flywheel, 109 teeth, that mates 6V starter transmissions to later style 12V O-ring cranks, 200mm clutch, not requiring any grinding.
_________________
"Criticism comes easier than Craftsmanship"
- Zeuxius, 400 BC

[Bobnotch]

[Boroboy63]

Thanks Guys
I originally thought it was the diff, I had actually forgot that it was a six volt trans, and that I had clearanced the gearbox doh!
Trouble is now that I have taken it out, I dont want to put it back, until I know that its not the trans, so I am going to have to have it rebuilt.
I know an option is to fit a 6v flywheel, wasp do a starter that suits that application, so that could be an option.
I will fit a new clutch as a matter of course.
Turning the half shafts with the transmission out, it feels smooth and in order, whilst it was fitted with the engine in, you could hear it rumbling just pushing it on the drive. (With the gearbox in neutral).
The box shifts really nice, doesn't jump out or anything like that.
The joys of restorations!

[Zwitterkafer]

[Boroboy63]

just an update, apparently the pinion bearing is absolutely stuffed. From my point of view, I'm glad they have found something.

[Zwitterkafer]

That makes total sense, given the symptoms. Unfortunate, but it will be so much nicer once repaired! Best of luck!
_________________
"Criticism comes easier than Craftsmanship"
- Zeuxius, 400 BC