prop fell off help???

Post by **TyreFryer** » Tue Aug 14, 07 2:44 pm

If you mark the yoke and the propshaft and put them back in the same position you shouldn't need to get it re-balanced.

Anonymous · Post by **Anonymous** » Tue Aug 14, 07 7:59 pm

Get it re-balanced, for the money it costs compared to the agro if you put it all back together and find something is still out of balance it's worth doing.

Post by **TyreFryer** » Tue Aug 14, 07 8:22 pm

Pete, could you feel it vibrating before the UJ failed i.e. since you bought the car? If it wasn't vibrating before the UJ fell apart I wouldn't bother having it balanced. If it was out of balance you'd have known about it. It'll cost £70 to £100 to get it balanced I think. I've replaced several UJs in propshafts over the years and never had to have them re-balanced, just make sure you put them back together in the same position they came off.

latil · Post by **latil** » Tue Aug 14, 07 9:44 pm

I've never re balanced a prop after fitting UJs,no need if everything is marked and put back correctly. I've cut and shortened many props over the years,helps if you have a big enough lathe to part-off and to align for welding.

Anonymous · Post by **Anonymous** » Wed Aug 15, 07 1:26 pm

yea it never rumbled or vibrated b4 hand, only for about 2 seconds befor it detached itsself

pm sent pete thanks

Ivor · Post by **Ivor** » Wed Aug 15, 07 1:43 pm

It sounds like have a dig at James week (he deserves it anyway!

) but I've never balanced a prop in my life and shortened several at home too, without any adverse effects.

That's not to say that from an engineering standpoint it's not good practice, I've just found it unnecessary.

I remember on a mates Pop we had a prop vibration and solved it with a judiciously placed Jubilee clip.

Nothing personal, fellow Rootes Group man!

Anonymous · Post by **Anonymous** » Wed Aug 15, 07 4:34 pm

None taken, you are all a bunch of bodgers!

As a general rule I check the balance of anything that goes round in circles especially if I make any changes to it.

who wants the clever calculation for how many revs your prop can take before it falls apart? Note: this doesn't include 2nd and 3rd order calculations for the harmonics or prop sag issues.

Post by **TyreFryer** » Wed Aug 15, 07 4:56 pm

How many propshafts have you had balanced then James?

Tell the truth!

Ivor · Post by **Ivor** » Wed Aug 15, 07 5:17 pm

Ooh, he's gone very quiet!

Anonymous · Post by **Anonymous** » Wed Aug 15, 07 5:22 pm

3 props, 4 cranks, 4 flywheels, 3 clutch housings, 3 dampers, 20 con rods.

'Had balanced' is not the same thing as checked the balance though. You don't always need to replace the balance weights (or re-drill if that is what you need to do).

Post by **TyreFryer** » Wed Aug 15, 07 5:30 pm

And how much did that lot cost you?

Anonymous · Post by **Anonymous** » Wed Aug 15, 07 5:37 pm

It helps when you have friends on the inside

The crank assembly balances (crank, flywheel, clutch housing, damper) I got done as cash in hand and went after hours and did it myself. That cost about £25 - £40 depending on how much we had to change and how long it took. I used Denis Welch for that since I used to work there.

Rod balancing you can do in your shed with an accurate set of scales and something near a surface table.

I lost my main contact for prop balances, so now I have to pay. At Dave Mac's I paid £85 for a prop rebuild and balance. I think the balance was £40.

Rich · Post by **Rich** » Wed Aug 15, 07 10:25 pm

Denise Welch???Hmmmmmmmmmmmm

Anonymous · Post by **Anonymous** » Wed Aug 15, 07 11:55 pm

I'm inclined to go with James , so quit the bodging & do it right.

Seriously , i would think anything spining that sort of speed would need balancing if any mods are carried out to it , ie , shortening or lengthening.

Don't wanna get into a fight , but most of you are talkin "bannanarama".