Vibration/rumble

OK been chasing his for a while, 94 NA, brand new one piece installed at 30'000 before I bought the car, New 5 speed fitted just prior to that by Nissan, tires balanced and checked, Car has had all mature owners so not thrashed at all, I can feel a slight vibration around town at 60 kph then it seems to go away until around 90 kph, where it it seems to be more of a rumble with slight vibration, the funny thing is sometimes you are at that speed and you can feel it come in,

some days it seems that you can feel it it slightly more than others, it seems to be more noticeable on drivers side and I can feel it slightly thru steering wheel and gear stick

I have not delved too deeply into this as its more annoying then anything but you kind of expect these cars to be smooth so...

I am assuming that the Uni's are good because of the age of the tailshaft, I have swapped drivers side axle to eliminate CV's

I have toyed with the idea but not tested,of gearbox mount,

Any idea's?

 

Hey mate. Firstly, I'm no 300 guru.

However, I've encountered something similar.

I had a new set of wheels and tyres fitted by Bob Jane's and such a vibration developed. Everything had been balanced ect. and like you, I went looking for answers.

My mechanic said that with what i - or you in this case - was describing was a wheel balance issue and sure enough he took them off and balanced them himself, and even though the adjustment was only slight, it was enough.

So yeah, my mech balanced my wheels in a superior fashion to a specialist and solved my woes.

Perhaps it's worth getting another look

 

Thanks for the reply, I have actually had them balanced 3 times at different tire places, so I think I can rule out balancing or wheels/tires although I was toying with new on the back as they are the same ones that came with the car but am not really thinking that they are an issue.

 

Not a worry mate. Figured my 2c couldn't hurt

Best of luck!

 

Thanks mate

 

I should have also put in that wheels have been rotated as well, and there does not seem to be much if any change in pitch or frequency as speed increases or decreases, tires don't scrub so I am buggered as to what it could be, was thinking maybe tail shaft out of balance but the fact that the frequency does not seem to change much kind of kills that.

 

A few things can cause it. Sagging engine and gearbox mounts, failed diff and subframe mounts. If none of those then the uni's on the one piece could be on their way out.

 

Wouldn't you end up with scrubbing tires if it was sub frame mounts?, and Nissan dealer paperwork says the uni's were greased not that long before I bought it, so you would hope that they would have picked up wear, anyway thanks for the reply, you have given me some more ideas

 

Probably the one piece, they are harder to balance, has the vibration been there the whole time since you have had the car or developed?

 

Been there since I bought it, didn't notice it until I got it out of the city though

 

Clock the tail shaft.

 

Ok sounds like that's my next move then, Thanks Guy's