Drive line vibration

[nigel jarrett]

Coming back from our area AGM the car has started to vibrate when changing gear ,when the drive is taken up it disappears.its also there if you coast in neutral with the clutch pedal up.once in gear and driving no problem,any suggestions please

[Keith Clements]

Most likely is a layrub coupling although the vibration usually alters with speed. It could also be loose nut on end of Gearbox , midship or diff . Also check midship support brackets.

[Tony Fearn]

Hello Nigel,
I was waiting to see if a reply came from a Javelin owner, as I thought it sounded like a problem with the Layrubs. I had the same problem with my 1933 Flying Fox, and I think Julian had to change his couplings on the 1934 Kestrel.
Tony.
P.S. They aren't cheap these days.

[David Morris]

Hi Nigel,

New Layrub couplings are available from JCS, and are also available 'off the shelf' (slightly cheaper) from a local company. I have forgotten their name but John Airey has purchased from them fairly recently. They have four rubber 'bobbins' that can be replaced individually, once you separate the two plates, but buying four bobbins is almost the same cost as a new coupling and is not really worth the effort.
David

[CyrilWhite]

The expensive Layrubs are getting more people thinking about Hardy Spicer conversion, so that is worth considering if vibration needs full set of Layrubs.
Wide angle hardy spicer on land rovers are very reliable , why not on Jowetts ?

[Keith Clements]

Bill Lock does a conversion to Hardy Spicer. This was going on Peter's Jav to fix the wear on the splined shaft with the previous conversion done in NZ but time prevented installation. Peter has the modified shaft to fit. Note that the shaft must be modified with a splined shaft to fit UJs. Bill has completely new props made with UJs fitted and adapter for early or late Javs.

Look in JT for direct supply of Layrubs if you do not want to go to JCS. I have got through a few hardy Spicers in my time but they are only about £10 to replace whereas layrubs are £100. Thus the cost of two Layrubs versus a new prop is a little more expensive but it is easier to replace a layrub than a HS UJ. I have done the layrub change at the roadside a few times whereas the UJ needs a few tools that I do not normally carry.

[nigel jarrett]

Thank you all ,yes the rear layrub had parted company seeing as it is only one layrub faulty I shall stick with this set up for the time being.