Bought a single piece prop from Z1 and fitted it over the weekend. All looks ok but somethings not right as at 60mph it drones something awful - and it increases with speed.

 

I've checked everything, rotated the diff connection through 180 degrees and even raised the new(ish) rear gearbox mount in case it was sagging - but all to no avail.

 

So, a couple of questions - do I need to ballance the shaft - jubilee clips etc - or am I missing something?

 

Any advice much appreciated.

 

The new one piece prop is steel and the cars a 97NA 2+2.

 

The old prop was unbelieveably notchy especially at the diff end - and the centre bearing looked ok but had a lot of play in it. Vibrated lots at 70mph.

 

Cheerz

 

Jack

I've just had a replacement autobox and 1 piece prop on LWB NA and have the exact same symptons!! I have new gearbox mount etc. Had spent several £100's trying to recon old prop/bearing, which never got rid of the vibe, but now the vibration is different, bearable, but I am sure it is going to get worse. Did your prop come from the States?

Pete

 

The prop did come from the States.

 

Have you had your prop balanced? or was it supplied balanced? I'm assuming that they are balanced, but if this is the case, where's the vibration coming from?

 

Prior to buying the prop I've been through all of the usual checking tyres, wheels etc so I think they are all ok.

 

Anyone got any ideas?

 

Cheerz

 

Jack

Unfortunately I never saw the prop as fitted by SWZ, but I'm sure it would be balanced. My wheels are in balance, have some play in diff output shafts, but I'm sure it's the prop. The noise gets worse as you apply load over 60MPH. Has any one else got a silent 1 piece prop?

I had the same thing and found that my single piece shaft was bent!

 

All fixed now, found it was 3mm out!

 

Here is the big thread about it

 

http://www.300zx.co.uk/forums/showthread.php?t=82044&highlight=mounting

ed - I can quote your thread word-for-word - very informative. But, now that your one piece prop is 'not bent', does it run smooth? Did the guys that straightened it for you actually do that or did they counter-balance it to offset the effect of 'the bend'?

 

cheerz

 

Jack

I bought My prop from MJP, got it on the cheap as it was sold to me as faulty. It had been made too long and needed shortening. I took it to be shortened and took the oem prop with me as reference. Got it back and they had shortened the tube to the exact length of the stock prop. They had also balenced it etc. Put it on the car and there was a nasty vibration 70-80mph. I took the prop off and gave it back to them, they said it was in balence but bent, out by 3mm end to end. They bent it back and rechecked the balence, I fitted it back to the car and couldnt belive how smooth it was!

 

1 week later my piston rings failed! :(

Ed - sorry to hear of the piston ring failure - and thanks for the prompt response.

 

Sounds like I need to get the prop balanced.

 

Cheerz

 

Jack

Yep get it checked, it should have weights, they are normally a circular bit of metal about 50p size, attached to the side of the tube at each end. A bit like balencing a wheel etc.

 

Oh yeah also check the alignment of your gearbox in relation to your diff.

 

I now have a forged engine waiting to be dropped into my car :)

Ed - it's got the 50p pieces welded to one end. Just tried a jubillee clip on the diff end (easiest to get to) but no good. I think it's lateral angle thats causing the problem, and not the prop itself ...I've changed the vertical angle but to no avail.

 

I'll look further into a solution.

 

Good luck with the new engine.

 

Cheerz

 

Jack

I now have a forged engine waiting to be dropped into my car

 

Err. Correction!! :slap:

I have a forged engine waiting to be dropped in to yer car.

Not sure where I have put it??? :confused:

Im sure it will turn up somewhere! :rofl: :rofl: :rofl:

yeah very funny :slap:

Hello?? Forged engine??

any1 else fitted ones of these props? im looking at gettin one myself...

 

good or bad feedback?

Mine is sweet now its balenced!