il-bob Posted February 21, 2008 Share Posted February 21, 2008 Hi Guys, Maybe you can help me out... When I engage difflock, the rear passenger wheel gets stuck, and only turns when it meets an obstacle, like going over a large stone or so. Else, like for example driving in difflock on gravel, it just doesn't turn. To say the truth, I haven't dismantled anything to check out like bearing and so on. Funny thing, it only happens in difflock mode, otherwise everything fine. Any idea what might be causing this problem? bob Quote Link to comment Share on other sites More sharing options...
tacr2man Posted February 21, 2008 Share Posted February 21, 2008 Have you got contant 4 wd transmission as well as the 300tdi engine? Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 21, 2008 Author Share Posted February 21, 2008 I have LR 90 running gear, ie axles, gbox and transfer case. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 21, 2008 Share Posted February 21, 2008 And this is when you engage central difflock in the transfer box? Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted February 21, 2008 Share Posted February 21, 2008 Define stuck a little better ? with 3 wheels on the ground and a rear wheel raised then it should not rotate when the centre difflock is engaged ..................... What are your axle ratios' ............... they must be the same front & rear .............. if you had a 3.54 one end and a 4.7 in the other, then yes, driving in difflock will be impossible because it will 'wind up' to the point of lockup very quickly HTH Ian Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 21, 2008 Author Share Posted February 21, 2008 Define stuck a little better ? I mean all 4 wheels on the ground, driving on gravel, tarmac and so on, and rear passenger wheel just doesn't turn. with 3 wheels on the ground and a rear wheel raised then it should not rotate when the centre difflock is engaged .....................What are your axle ratios' ............... they must be the same front & rear .............. if you had a 3.54 one end and a 4.7 in the other, then yes, driving in difflock will be impossible because it will 'wind up' to the point of lockup very quickly HTH Ian Re axle ratios I'm not sure. Is there a way to check what type of axles I have, maybe by serial number or something? Tks bob Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 21, 2008 Author Share Posted February 21, 2008 And this is when you engage central difflock in the transfer box? Yep. Driving in low range and engaing central difflock Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted February 21, 2008 Share Posted February 21, 2008 Yep. Driving in low range and engaing central difflock sounds like you may have mismatched axles then .................however, it should also happen in hi range diff lock as well. Jack up the rear, make sure the diff lock is out........... mark the rear prop and the rear wheel. rotate the rear wheel and count how many times the prop rotates rotates to get one revolution of the wheel............... this will tell you the ratio ........... i.e with std 90 diff, 3.54 revs of the prop will give one rev of the wheel............... on a std series diff 4.7 revs of the prop give one rev of the wheel............. Do the same on the front and compare notes................... Ian Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 21, 2008 Share Posted February 21, 2008 If it is skidding along the ground, how about a really badly binding brake? Or does it not happen when teh centre diff lock is disengaged.....? Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 21, 2008 Author Share Posted February 21, 2008 If it is skidding along the ground, how about a really badly binding brake?Or does it not happen when teh centre diff lock is disengaged.....? Only happens when difflock is engaged Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 21, 2008 Author Share Posted February 21, 2008 sounds like you may have mismatched axles then .................however, it should also happen in hi range diff lock as well.Jack up the rear, make sure the diff lock is out........... mark the rear prop and the rear wheel. rotate the rear wheel and count how many times it rotates to get one revolution on the prop............... this will tell you the ratio ........... i.e with std 90 diff, 3.54 revs of the wheel will give one rev of the prop............... on a std series diff 4.7 revs of the wheel give one rev of the prop.............. Do the same on the front and compare notes................... Ian Tks Ian. I'll check out tn. Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 21, 2008 Author Share Posted February 21, 2008 Thinking about it, aren't axles from coiled LRs (range rover, diso and 90s) 3.54s? Quote Link to comment Share on other sites More sharing options...
Matt Neale Posted February 21, 2008 Share Posted February 21, 2008 i.e with std 90 diff, 3.54 revs of the wheel will give one rev of the propIan Other way around Ian old chap - 1 revolution of the wheel will give 3.54 turns of the prop with 90 Diffs, 4.7 turns of the prop for series diffs. Matt Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted February 21, 2008 Share Posted February 21, 2008 That what I meant Matt ............... I just typed it wrong .................. well I know what I mean I have now corrected the post ..........well spotted ................... I have the only 350mph land rover 90 in existence Ian Quote Link to comment Share on other sites More sharing options...
Mark90 Posted February 21, 2008 Share Posted February 21, 2008 Nah there's a lower TD5 one that can do that I had to think twice about it when reading BBC's original post. With many other posters I'd have dismissed them as being wrong, but Ian has had some credability to his tech postings Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 21, 2008 Share Posted February 21, 2008 Thinking about it, aren't axles from coiled LRs (range rover, diso and 90s) 3.54s? Yes but you can swap them out for 4.7:1 Series diffs, it wouldn't be the first time someone's done that. Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 23, 2008 Author Share Posted February 23, 2008 I've checked both font and rear diff ratios. I jacked up the rear first. While turning both wheel and prop, there's nothing holding the wheel. It just turns freely. For every approx 3.5 turns of the prop, the wheel turns 1 revolution. Also, its the same in the front. So, diff ratios eliminated. Pls inspie me on what might be causing this problem. Tks, bob Quote Link to comment Share on other sites More sharing options...
jimmy_neutron Posted February 23, 2008 Share Posted February 23, 2008 Jack one side of the car up so that 2 wheels are off the ground. Engage diff lock and gearbox in neutral, handbrake off. Obviously make sure the car isn't going to roll away. Mark both wheels at the top with some pink paint. Turn the back wheel 20 times. Watch the front wheel follow exactly. After the 20 turns, how many rotations did you miss and how many degrees are you out ? Quote Link to comment Share on other sites More sharing options...
il-bob Posted February 28, 2008 Author Share Posted February 28, 2008 So, I followed your procedure, and out of 7 turns of the rear wheel, the front wheel turned approx 9 and a quarter turns. What does this mean? Bob Quote Link to comment Share on other sites More sharing options...
sgnas Posted February 28, 2008 Share Posted February 28, 2008 Hmm. out by 4.7/3.54 (1.32*7 =~9) Looks like series diff in one axle and coiled in the other. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 28, 2008 Share Posted February 28, 2008 Ouch.... literally just did a diff swap on an Asia Rocsta because of this very reason -they drive a bit funny in difflock to say the least! Quote Link to comment Share on other sites More sharing options...
gruntus Posted February 29, 2008 Share Posted February 29, 2008 Guys, Just wanted to mention what a great example of problem solving that makes me love this forum. G Quote Link to comment Share on other sites More sharing options...
western Posted February 29, 2008 Share Posted February 29, 2008 jimmy_neutron -- with some pink paint. you big girl nearly as bad a Les H & his 'Peach' sofa. Quote Link to comment Share on other sites More sharing options...
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