Mack Posted January 4, 2011 Share Posted January 4, 2011 Hi try to search, but.... How many degress is the misalignment between the propshaft ends? thanks Quote Link to comment Share on other sites More sharing options...
western Posted January 4, 2011 Share Posted January 4, 2011 Front Prop should be out of line [out of phase] by 30degrees -- UJ yokes rear prop should be in line [in phase] UJ yokes at both ends in alignment. surprised you couldn't find anything as this was talked about a few months ago. Quote Link to comment Share on other sites More sharing options...
Grant. Posted January 4, 2011 Share Posted January 4, 2011 Am I right thinking that it works out as 2 splines out of phase on the front prop? (or so ive been told...) Quote Link to comment Share on other sites More sharing options...
western Posted January 4, 2011 Share Posted January 4, 2011 something like that, 2 or 3 spline difference. Quote Link to comment Share on other sites More sharing options...
V8 Freak Posted January 4, 2011 Share Posted January 4, 2011 Yes.. and if you imagine standing underneath looking forward, the front yoke is approx. 2 splines ahead of the rear end in an anti-clockwise lead. (I think that makes sense..) Neil Quote Link to comment Share on other sites More sharing options...
JJB Serenity Posted January 4, 2011 Share Posted January 4, 2011 Can someone explain what this all means please sorry! Quote Link to comment Share on other sites More sharing options...
V8 Freak Posted January 4, 2011 Share Posted January 4, 2011 This may help JJB... http://forums.lr4x4.com/index.php?showtopic=61830 PM me if you want to discuss further... Neil Quote Link to comment Share on other sites More sharing options...
western Posted January 4, 2011 Share Posted January 4, 2011 Can someone explain what this all means please sorry! basically to kill driveline vibration & more here http://en.wikipedia.org/wiki/Critical_speed & in our very own International forum http://forums.lr4x4.com/index.php?showtopic=48581 Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted January 4, 2011 Share Posted January 4, 2011 This illustrates it quite nicely: Front prop on the top, rear on the bottom. Those ones were for my 200Tdi 90 The basic reasoning behind it is due to the universal joint's transmit motion. They don't transmit it in a smooth way when operating at an angle, they start varying the input and output speed in a sine wave sort of way, in other words it speeds up and slows down as the prop rotates. The amount is does this is proportional to the working angle of the joint. On the rear axle the line of the diff pinion and the line of the transfer box flange are parallel, they're both parallel to the centre line of the vehicle. This means that the two joints are at opposite angles at all times (if we discount other small factors like axle movement under extreme articulation etc.), and the irregularities in speed mentioned above are also equal and opposite and so balance out. On the front prop the diff pinion is pointed up slightly (have a look! ) and so the UJ angles are not equal. This would cause an imbalance, so there is a slight mis-alignment in the yokes to account for it and to minimise any vibrations through the drive-train. To try and level out the peaks of the waves, as it were. It's more complex than I understand, but that's my basic grasp of the concept! Quote Link to comment Share on other sites More sharing options...
JJB Serenity Posted January 4, 2011 Share Posted January 4, 2011 Thank you chaps, very helpful indeed! I understand now. What I'm not sure of now is how they get out of line to begin with. Furthermore, because I've got a bit of noise and vibration from my drivetrain I'm now paranoid that my props need realignment Quote Link to comment Share on other sites More sharing options...
Mack Posted January 5, 2011 Author Share Posted January 5, 2011 Front diff pinion flange is not contained in the same vertical plane with the Tbox front output flange ( A bit too the right) . In the 110" Puma the rear shaft are also not in "phase". So still not sure is those are 30 or 45º Quote Link to comment Share on other sites More sharing options...
western Posted January 5, 2011 Share Posted January 5, 2011 Thank you chaps, very helpful indeed! I understand now. What I'm not sure of now is how they get out of line to begin with. Furthermore, because I've got a bit of noise and vibration from my drivetrain I'm now paranoid that my props need realignment down to the gearbox/axle alignment, but initial set up is done at the factory/design stage on purpose to eliminate any vibs from drivetrain. Quote Link to comment Share on other sites More sharing options...
Mack Posted January 5, 2011 Author Share Posted January 5, 2011 This illustrates it quite nicely: I do not think the pic makes sense. The upper prop has yokes at 90º? Quote Link to comment Share on other sites More sharing options...
western Posted January 6, 2011 Share Posted January 6, 2011 This illustrates it quite nicely: I do not think the pic makes sense. The upper prop has yokes at 90º? top porp right hand end is not dead inline with the left hand end UJ, compared to the rear prop UJ's shown below Quote Link to comment Share on other sites More sharing options...
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