Clunk on takeup

I have a 90 that has had a 200tdi fitted at some point.

quite often there is a clunk on lifting the clutch both when setting
off from standing and when changing up during driving.

I have had a look and discovered that i can get a fair bit of
rotational play by hand on the front propshaft , my question is, how do
i know whether the fault lies in the front diff, or the transfer box?

cheers

colin

In message <[email protected]>
"cg" <[email protected]> wrote:

> I have a 90 that has had a 200tdi fitted at some point.
>
> quite often there is a clunk on lifting the clutch both when setting
> off from standing and when changing up during driving.
>
> I have had a look and discovered that i can get a fair bit of
> rotational play by hand on the front propshaft , my question is, how do
> i know whether the fault lies in the front diff, or the transfer box?
>
> cheers
>
> colin
>

Start off checking the propshaft UJ's. With the appropriate wheels
chocked, jack up a corner with the handbrake off and check for play
in the propshaft UJ's - the rear of the front prop is favourite. It
important to check UJ's with no load on them - even very knackerd
ones will seem ok with the wheels on the ground and the handbrake
on.
Check all the radius arm bushes and the A frame ball joint.
If they are ok, and the free play is more than about ¼ turn,
take the PTO cover off the transfer box and rattle the input
gear - no rusty muck and/or play means thats probably ok. A bit
of a clunk isn't wildly unusal, and you may just have to wait
for the offending component to make itself known.

It quite unikely that the diffs are at fault - they are usually
very vocal about telling you when they are unhappy.

Richard
--
www.beamends-lrspares.co.uk [email protected]
RISC-OS - Where have all the good guys gone?
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Thanks for that, I don't think it is the UJ's when i rotate the
propshaft, the UJs at both ends also moves with the shaft.

I am puzzled.

colin

On or around 7 Aug 2006 08:01:46 -0700, "cg" <[email protected]>
enlightened us thusly:

>
>
>Thanks for that, I don't think it is the UJ's when i rotate the
>propshaft, the UJs at both ends also moves with the shaft.
>
>I am puzzled.

it can be CV joints in the front axle, if the axle's done a lot of miles.
However, if it's a 5-speed LTT77 then my money's on the gearbox output
shaft/transfer input gear splines. expensive fix, if so, so carry on
driving and be gentle with the clutch.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"If you cannot mould yourself as you would wish, how can you expect
other people to be entirely to your liking?"
Thomas À Kempis (1380 - 1471) Imitation of Christ, I.xvi.

In message <[email protected]>
"cg" <[email protected]> wrote:

>
>
> Thanks for that, I don't think it is the UJ's when i rotate the
> propshaft, the UJs at both ends also moves with the shaft.
>
> I am puzzled.
>
> colin
>

I think you are looking for the wrong thing. The UJ's will always
turn with the propshaft (belive me, if they don't you really would
notice ;-) ), the UJ's are X shape things that join the actual
shaft to the drive flanges (the bits with the 4 bolts in that go into
the gear box one end and the diff the other). The ends of each
arm of the X sit in little cups in the yoke (the sort of arm
things). You should be looking for sideways movement where the
X "legs" go into the cups - i.e with a wheel off the ground
try and push-up and pull-down the propshaft - it shouldn't
move except for the normal truning movenent.

That's probably worst explanation ever, but I've tried!

Richard

--
www.beamends-lrspares.co.uk [email protected]
RISC-OS - Where have all the good guys gone?
Lib Dems - Townies keeping comedy alive

On my old 200Tdi Disco it turned out to be the A frame ball joint, as
mentioned above.
TonyB