Could this be the cause . . .

odyssey · Oct 2, 2014

. . . of some 'harshness' at about 65-70mph?

It's a '98 4.6 HSE.

Harshness is the only word that sort of describes it, it's not really a vibration, or a rumble, it's just not as smooth as it runs at 60 or 75, and it's hard to identify where it's coming from.

Anyway whilst grovelling about underneath it recently, scraping dried mud and odd stones out from nooks & crannies, I found the piece in the attached photo (with a pound coin for scale) lying in the 'U' shaped thing that I assume stops the end of the rear propshaft flailing about if the UJ fails (don't know what it's called).

I think it may be a balance weight off the propshaft, 3 layers thick and it's about the right diameter - there is also very slight evidence of a couple of spot welds on the inside.

The question is, as I have no access to welding gear, if I can identify (via matching spot weld marks on the prop) the correct position it came from, would be worth trying to araldite it back on rather than replace the whole prop. Also wondered about testing correct position by using a cable tie.

Any thoughts will be greatly appreciated . . .

THX - Alastair

brianp38dse · Oct 2, 2014

looks about right for proshaft balance weight would need to go backin right place, my be better of getting another prop putting new uj`s in and fitting that

wammers · Oct 2, 2014

Put a couple of Jubilee clips on the prop should be easy enough to see where the weight came from. Move them round see if your vibration improves.

tomcat59alan · Oct 2, 2014

brianp38dse said:
looks about right for proshaft balance weight would need to go backin right place, my be better of getting another prop putting new uj`s in and fitting that

+1 on the balance weight, the prop should show some sign's of loosing it though. If you can see where it was fitted, whip the prop off, drill the weight in the middle and have it MIG welded back in place filling the hole in the process.

wammers · Oct 2, 2014

tomcat59alan said:
+1 on the balance weight, the prop should show some sign's of loosing it though. If you can see where it was fitted, whip the prop off, drill the weight in the middle and have it MIG welded back in place filling the hole in the process.

Don't forget to use some heavily corroded welding wire.

tomcat59alan · Oct 2, 2014

wammers said:
Don't forget to use some heavily corroded welding wire.

Metal should be clean where it's drilled, if it's not chuck it away

I'm only back one day and you fecking start on me.

wammers · Oct 2, 2014

tomcat59alan said:
Metal should be clean where it's drilled, if it's not chuck it away I'm only back one day and you fecking start on me.

Good holiday i take it Alan.

tomcat59alan · Oct 2, 2014

wammers said:
Good holiday i take it Alan.

Bit hot for the first two weeks so I took it easy. She had me painting the outside in the third week, looks good and well worth the effort. Spoilt her and got a new satt tv system, keep her quiet. All in all a great time

wammers · Oct 2, 2014

tomcat59alan said:
Bit hot for the first two weeks so I took it easy. She had me painting the outside in the third week, looks good and well worth the effort. Spoilt her and got a new satt tv system, keep her quiet. All in all a great time

Same as the ones in Spain were you pay some Russian company not a lot and get all the Sky and European channels?

tomcat59alan · Oct 2, 2014

wammers said:
Same as the ones in Spain were you pay some Russian company not a lot and get all the Sky and European channels?

No, but unless you've signed the official secrets act I cannot tell you. Does that give you a clue.

wammers · Oct 2, 2014

tomcat59alan said:
No, but unless you've signed the official secrets act I cannot tell you. Does that give you a clue.

I have indeed signed the official secrets act.

tomcat59alan · Oct 2, 2014

As have I

will pm the details

jamesmartin · Oct 2, 2014

tomcat59alan said:
+1 on the balance weight, the prop should show some sign's of loosing it though. If you can see where it was fitted, whip the prop off, drill the weight in the middle and have it MIG welded back in place filling the hole in the process.

that little piece would make no difference

wammers · Oct 2, 2014

jamesmartin said:
that little piece would make no difference

I agree James, certainly won't make the car rattle.

tomcat59alan · Oct 2, 2014

wammers said:
I agree James, certainly won't make the car rattle.

Didn't think it would myself but as he's got it........ Lost one off a Classic in Southern Spain, did the Jubilee clip job, got it back to England before the real reason came to light. Turned out a new U/J had been fitted into a worn yoke, after 5000 miles the bearing became oval

odyssey · Oct 2, 2014

Thanks for your thoughts (and the entertaining excursion into an alternate universe of spurious satellite tv and official secrets

)

Also - it's not really a rattle - it's a speed related 'lack of smoothness' . . .

Anyway - further research seems to indicate that props are supplied to LR ready balanced by the manufacturers, surely the bean counters wouldn't let them do it if it didn't 'make a difference'.

The bit weighs 20 grammes, I know it won't have the same centrifugal effect as 20g at a wheel rim but I think it's worth trying to re-attach it to see if it does cure the harshness.

jamesmartin · Oct 2, 2014

odyssey said:
Thanks for your thoughts (and the entertaining excursion into an alternate universe of spurious satellite tv and official secrets )

Also - it's not really a rattle - it's a speed related 'lack of smoothness' . . .

Anyway - further research seems to indicate that props are supplied to LR ready balanced by the manufacturers, surely the bean counters wouldn't let them do it if it didn't 'make a difference'.

The bit weighs 20 grammes, I know it won't have the same centrifugal effect as 20g at a wheel rim but I think it's worth trying to re-attach it to see if it does cure the harshness.

balance weights are commonly corroded off but no one notices

wammers · Oct 2, 2014

odyssey said:
Thanks for your thoughts (and the entertaining excursion into an alternate universe of spurious satellite tv and official secrets )

Also - it's not really a rattle - it's a speed related 'lack of smoothness' . . .

Anyway - further research seems to indicate that props are supplied to LR ready balanced by the manufacturers, surely the bean counters wouldn't let them do it if it didn't 'make a difference'.

The bit weighs 20 grammes, I know it won't have the same centrifugal effect as 20g at a wheel rim but I think it's worth trying to re-attach it to see if it does cure the harshness.

I would be looking elsewhere for the problem to be honest.

tomcat59alan · Oct 2, 2014

odyssey said:
Thanks for your thoughts (and the entertaining excursion into an alternate universe of spurious satellite tv and official secrets )

Also - it's not really a rattle - it's a speed related 'lack of smoothness' . . .

Anyway - further research seems to indicate that props are supplied to LR ready balanced by the manufacturers, surely the bean counters wouldn't let them do it if it didn't 'make a difference'.

The bit weighs 20 grammes, I know it won't have the same centrifugal effect as 20g at a wheel rim but I think it's worth trying to re-attach it to see if it does cure the harshness.

Stay confused, if we told you we would have to kill you.

Could this be the cause . . .

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