Thread: The ultimate solution to Td5 vibration / knocking

I read your post and know that that was how you resolved most of your vibe issues. I took it to a land rover drive train specialist who does not seem to think rebuilding the tc will make a difference.....but I did not really agree.

The issue is that it is half doing the job....the motor will still have a vibe and slowly they will get worse.

well we all know by now that any engine has one or more harmonics. Small or big, even a dremel tool when spinning up has a vibration at some speed. Can't do much about it apart from fighting the result of that harmonic vibration - parts on the Rover that will start to vibrate as well when hitting the harmonic.

The transfer box' bearings had been suffering from this vibration for 190000 km, so replacing them softens the effects of the harmonic a lot - less play, less rattle.

And it's right at the transfer box output side where the vibes seem the most aggressive. That is why so many have the annoying rattling park brake shoes as one of the major side effects.

Without the transferbox harmonic damper mine was a nightmare to drive, so it sits there for a reason! Experimenting with the weight of that thing could help or worsen the vibrations. Something has to dampen the vibration when it peaks at an RPM of 2200 or around that number

Whilst the transfer box is going to suffer wear and tear like any other component, I don't think it is exacerbated by the harmonics of the Td5. Its just too far removed. The gearbox should shake itself to death before the TC.

In any case, I will have the TC rebuilt as it can't hurt.

Thanks again for your very descriptive thread when you were troubleshooting yours....Is yours still nice and smooth?

Well it will neber be as nice and smooth as when new but it is a lot better than before. Currently it's -17C and snow so have postponed all under-the-vehicle jobs for now, but will also replace the front output bearing.

Interesting observation was when my wife drove the disco last week after a pre-christmas dinner - since you can drink 0 alcohol here in Norway and drive - I sat on the RHS for a change and did notice the slight vibration that remains is more noticeable there then from my drivers seat. Just look at your transfer box - both output shafts are on the RHS of the vehicle. They definitely contribute to the noise and vibrations heard and felt.

OK, have had the TC completely rebuilt - new everything.

AND THE VIBRATION IS WORSE THAN EVER


I dropped the rear shaft on the weekend and found that the vibration was pretty much gone. And I was loving it!! The backlash had increased but no vibration. Was as near to perfect as ever. Drove to the drivetrain "specialists" and described the issues. Pick the Landy up today after the TC was completely rebuilt and the rear shaft refitted with a new centring bearing and it is horrible. But what ****ed me right off was that I was told that it was all good again and that even the vibrations at 100 were gone. I mean, they must have been sitting in another car when they tested. It is not one of the types of vibrations that can only be felt because I know the car inside out and have owned it for a long time. It is one that can be easily felt and heard by anyone who sits in it. And the "specialist" telling me it was gone. To their credit, they did tell me it was NOT the transfer case but I insisted on having it rebuilt anyway. And the reason I went against their advice was because I had thought that they did not really understand the issue in the first place......so I am the one to blame there.

Ohh well, at least I have completely eliminated the TC.

I DO understand that the vibration is coming from the motor. That I have never doubted as an ever so slight vibration can be felt even when at stand still and in N, however, the drivetrain, somewhere in the drivetrain, is amplifying the engine vibration.

So, now I need to swap over the rear shaft and donut with someone who does not experience the issues I am. If it cannot be felt with another shaft and donut I will swap donut only to see if is the shaft itself or the donut or a combination of the two.

Another item it could be is the drive shaft into the diff. This could be slightly out of round, however, thinking about it even if it were a few thou out it surely would be leaking oil??

Question, and it's a long shot, but could a twisted axle be causing or contributing to the vibration, remembering that dropping rear drive shaft and it disappears?

By the way it is obviously worse because the TC is now nice and tight so there would be more direct transfer of the vibration through everything that connects to the TC. Backlash is now non existent where there was a little previously.

I might drop the rear shaft as the vibes would not be doing the TC any favours..

I can help out with a spare/new donut, let me know if you want me to drop it over.

cheers
Crossy

Got something similar with mine but its at 2000rpm in any gear, push past it and it settles down.Its also noticeable when you back off and come back thru 2000rpm
So far have
Replaced 1 engine mount that had sagged,
replaced all 4 wheels brake pads and free'd up the front calipers ( that were full of dust from our Canning trip mid year.
Checked all the gearbox mounts, body mounts, run the car with the Nanocom to see if any faults logged..None..
Got the car wheel aligned.
Today I removed the main belt and 1 of my pulleys has a really noisy bearing, so that will be replaced tommorrow.

I think with mine its a bearing that is not running true at a certain rev range, so hoping that it will be solved when I fit the new bearing tommorrow.

Its the pulley on the passenger side next to the power steering pump pulley, very easy to remove so will post up tommorrow night how I go.

Cheers Ean