Vehicle & Technical > Discovery
Vibration..
4 landies:
Will the TD5 dc prop fit on a 200tdi aswell as a 300 if i change the flange
clbarclay:
--- Quote from: "Darren" ---The castor correcting radius arms are designed to correct the steering geometry, which can be upset by a lift because the axle is tilted forward. They also solve the problem of the UJ's not running parallel with each other when the suspension is lifted, which puts extra strain on the joints, although that's not their prime purpose. However, this does mean that the whole propshaft does run at a steeper angle, which can be on the limit of operation of the original joints.
As suggested above, the solution to that problem is to fit a double cardan jointed prop from a TD5, or a wide angle standard prop, both of which are able to run at steeper angles.
--- End quote ---
Close but no cigar, I've been here before with land rover props :roll:
Coil sprung Land rover transpher box output and diff input are designed not to be parrallel. When standard the UJs have the same working andgle and are phased so that the constant acceleration/deceleration of the first UJ is canceled out by the second UJ.
If you ever pull the sliding part of a propshaft apart mark it first so that when reasembled the UJs are still correctly phased.
When lifted the UJs no longer have the same working angles, with means for a constant transpherebox output the diff will be constantlly accelerating/decelerating which causes vibration on vehicles that have been lifted too much.
<pausesforbreath>
On vehicles that are lifted and then fitted with castor correction arms the working angles of the UJs are further changed. The top UJ is at an evan greater angle and the bottom UJ has a reduced working angle causing greater inbalance than before the arms were fitted.
A double cardon joint is effectively 2 UJs phased and constantly at the same working angle so that there is virtually not vibration. This replaces the top UJ which is at a greater working angle. The bottom UJ on a lifted and arm corrected land rover has little working angle and which changes very little, so a basic UJ can still be used withough casuing noticeable vibration.
:D
Range Rover Blues:
What he said.
As a bodge you can remove some of the vibration from a lilfted LR by lining uup the UJs on a standard propshaft, as the lift alters the UJ phasing, but once you fit castor correctio there is now better way than fitting some sort of CV joint.
Out of interest I have noticed that the phasing of the front prop is greater on later RRC, being about 45degrees.
barmiebrumie:
--- Quote from: "fabiocars" ---Will the TD5 dc prop fit on a 200tdi aswell as a 300 if i change the flange
--- End quote ---
Yes, just done mine :wink:
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