Aragorn Posted June 28, 2009 Share Posted June 28, 2009 Went to refit the front prop to the disco today, and noticed the phasing isnt right. As i understand it, the front prop should have one UJ slightly offset to the other one, on mine they're both inline. I'm not sure how the thing comes apart though to fix it? i tried pulling, but that didnt seem to work. Quote Link to comment Share on other sites More sharing options...
cipx2 Posted June 29, 2009 Share Posted June 29, 2009 Pull harder, it will come apart. To assemble it "in phase", you need to use some force 'cause the splines don't fit too well. As a result, there's a chance the splines are knackered. Examine their protective coat after you pull it apart. Quote Link to comment Share on other sites More sharing options...
bobtail4x4 Posted June 29, 2009 Share Posted June 29, 2009 if it came off the car, and wasnt a problem? leave it alone? Quote Link to comment Share on other sites More sharing options...
Night Train Posted June 29, 2009 Share Posted June 29, 2009 if it came off the car, and wasnt a problem?leave it alone? I'd agree, if it wasn't a problem then leave it as it is. If you must change it then have you unscrewed the collar on the splines that stop the splines coming apart? If you have then sometimes 'shocking' it apart works. Push it as far in as it will go and then yank it really hard outwards. If the grease on the splines makes it difficult to slide it quickly enough to shock it then wash off the grease with some parrafin or light oil and regrease after it is reassembled. Quote Link to comment Share on other sites More sharing options...
western Posted June 29, 2009 Share Posted June 29, 2009 this will explain, from my LR RAVE workshop manual Discovery section. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted June 29, 2009 Author Share Posted June 29, 2009 Well it was off the car when i got it, as the guy had swapped it onto his other disco because it had a duff UJ. He provided another shaft, but this doesnt seem to have the correct phasing (its streight, not offset like it should be), hence me asking how to change it. I guess the other possibility is that it is infact a rear shaft, but it seemed to fit the gap in the front just about right, and i think the rear is much longer? I tried just yanking it, but didnt want to pull too hard incase it wasnt supposed to come apart like that. Whats this collar that needs to come apart? i dont recall seeing anything that looked like it was supposed to come apart? Cheers Quote Link to comment Share on other sites More sharing options...
cipx2 Posted June 29, 2009 Share Posted June 29, 2009 There's no collar. The front prop is 604 mm long and the rear is 911 mm long, you can't use one in place of the other. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted June 29, 2009 Author Share Posted June 29, 2009 Right. I'll try pulling harder then! Quote Link to comment Share on other sites More sharing options...
TheRecklessEngineer Posted June 29, 2009 Share Posted June 29, 2009 Series front propshafts are not phased, and are of a similar length to discovery items. Might be worth checking your splines are in the middle of their travel. Quote Link to comment Share on other sites More sharing options...
Night Train Posted June 29, 2009 Share Posted June 29, 2009 Well according to Western's thumbnail attachment the splines are sealed and so to me that means that they don't come apart or are not intended to come apart. I would then suspect that it is the wrong prop shaft. Quote Link to comment Share on other sites More sharing options...
cipx2 Posted June 29, 2009 Share Posted June 29, 2009 The splines are sealed in the sense that there is a seal to keep the grease in and the water/dirt out (in theory). The seal is this one: I assure you that it does come apart, even if the prop is brand new Quote Link to comment Share on other sites More sharing options...
Aragorn Posted June 30, 2009 Author Share Posted June 30, 2009 hmm, the 90 prop i compared it with has one of those rubber boots, but the disco one doesnt i dont think. Perhaps i should post up an image of the prop to see what people think. Will try and get a photo of it tomorrow evening, as i'm going over to reattach the fan and airbox for its MOT on saturday. Quote Link to comment Share on other sites More sharing options...
cipx2 Posted June 30, 2009 Share Posted June 30, 2009 Besides the seal (dust cap) in the pic posted above, there's also the very early type of props where the cap can be unscrewed from the tube. But, unless the cap is cooked/old and lost its elasticity, you should be able to pull the splines through the cap. Quote Link to comment Share on other sites More sharing options...
TheRecklessEngineer Posted June 30, 2009 Share Posted June 30, 2009 I found it much easier to lever the rubber cap off with a screwdriver, then pull the splines apart. I actually went the other way - took a discovery prop and put it on a series. Quote Link to comment Share on other sites More sharing options...
muddy Posted June 30, 2009 Share Posted June 30, 2009 Some props have a steel threaded collar, some have that rubber thing and some have a sort of plastic collar that i had to prise over a lip to separate the splines. personally i would whack it on as it is and try it. Will. Quote Link to comment Share on other sites More sharing options...
Roverdrive Posted June 30, 2009 Share Posted June 30, 2009 Aragorn The Disco 1 and RRC front props are "phased" with the yokes at about 45 degrees to each other. The rear props are "in Phase" with the yokes in line. Mike Quote Link to comment Share on other sites More sharing options...
Aragorn Posted July 1, 2009 Author Share Posted July 1, 2009 Yep thats the whole problem Mine are in line. Quote Link to comment Share on other sites More sharing options...
landkeeper Posted July 1, 2009 Share Posted July 1, 2009 give it a good clean and look for the part number, from memory it's stamped into it Quote Link to comment Share on other sites More sharing options...
deepmud Posted July 2, 2009 Share Posted July 2, 2009 that 45 offset goes against what I was taught in college program - so what does it fix? normally, I ALWAYS set my ujoint in phase so that with the joints cancel out vibrations - and it looks like the rear shaft is set "normal" too - so I'm curious about the front - clearly it's there for a reason - i'm just not seeing it like this link is what I'm used to http://jniolon.clubfte.com/drivelinephasin...inephasing.html Quote Link to comment Share on other sites More sharing options...
Aragorn Posted July 2, 2009 Author Share Posted July 2, 2009 Its related to the angle of the axle flange vs the TXB flange on the rear both flanges are vertical, so as you say the speed differential will cancel out with both joints inline. On the front however the diff nose in inclined, so the axle flange is at an angle and the TXB flange is vertical. This difference creates the requirement for the offset joints to ensure smooth running. Quote Link to comment Share on other sites More sharing options...
deepmud Posted July 3, 2009 Share Posted July 3, 2009 Its related to the angle of the axle flange vs the TXB flangeon the rear both flanges are vertical, so as you say the speed differential will cancel out with both joints inline. On the front however the diff nose in inclined, so the axle flange is at an angle and the TXB flange is vertical. This difference creates the requirement for the offset joints to ensure smooth running. very smart - I get it. Thanks. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.