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Post by Eric R on Jul 16, 2016 9:32:13 GMT
Are tracking data sheets available for both the 3-litre and P5B? Specialists cobbled together such information as they could but still showing Bad front tyre wear but less than previously.
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Post by johnwp5bcoupe on Jul 16, 2016 15:30:42 GMT
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Post by lagain on Jul 16, 2016 20:50:56 GMT
I had problems with my front tyres wearing on the edges. The tracking was checked many times and they said it was OK, but they still wore on the outer edges. A few years ago I took my P5 to Discount Tyres in Worthing and they checked all 4 wheels with a laser tracking machine that showed that the front and rear wheels were not in line. Soon adjusted and no more problems
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Post by gingerbeer62 on Jul 17, 2016 7:28:50 GMT
Surely it matters not if the front and back wheels are not in line as long as they are the same both sides. Some cars are built that way with bigger tyres on the back than the front. Some cars have adjustable rear wheels for toe in/out. If the Both sides are out of line front and back the same way, then you have a bent car. My son once had a garage tell him that one front tyre was out of line and toed in. There is a lot of misinformation out there in garages. I bought one of these www.trackace.co.uk/ a while ago. Brilliant, simple tool and will check front and back wheels for toe in/out. Cheers Colin
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Post by enigmas on Jul 17, 2016 10:17:36 GMT
Gingerbeer, the tracking front to rear is due to production variations within the springs and/or their anchorage points. Sagged rear springs (to one side) can throw of tracking. Does your car sit level on flat ground? The laser system simply identifies inconsistences and then the technician dials in the necessary adjustment to compensate.
PS. You can confirm most of this by checking your car's chassis specifics with basic measuring tools.
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Post by gingerbeer62 on Jul 17, 2016 10:58:31 GMT
Gingerbeer, the tracking front to rear is due to production variations within the springs and/or their anchorage points. Sagged rear springs (to one side) can throw of tracking. Does your car sit level on flat ground? The laser system simply identifies inconsistences and then the technician dials in the necessary adjustment to compensate. PS. You can confirm most of this by checking your car's chassis specifics with basic measuring tools. I didn't say I was having a problem with the tracking on my Rover. What I was doing was questioning the statement about the front and rear wheels not being in line, made by a previous chap on this forum. The laser system I was recommending is only for checking the toe in/out setting, nothing else. Cheers Colin
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Post by enigmas on Jul 17, 2016 13:51:18 GMT
The term 'your car' gingerbeer was meant as a generality, referring to any P5 Rover.
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Post by lagain on Jul 17, 2016 19:46:38 GMT
All I can say is that once the four wheels were set up correctly so that the rear wheels followed exactly the path of the front, the front tyres no longer wore on the edges
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Post by gingerbeer62 on Jul 17, 2016 20:21:47 GMT
All I can say is that once the four wheels were set up correctly so that the rear wheels followed exactly the path of the front, the front tyres no longer wore on the edges Don't doubt you for a minute. But, how was it set up as I am interested in what they did in the garage. Cheers Colin
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Post by lagain on Jul 18, 2016 19:38:04 GMT
As far as I can remember the chap that did it, who was actually very good, put sensors on all 4 wheels, the laser then shone from the back to the front and he wound in the offside track rod and wound out the nearside to compensate. The difference was minimal but presumably enough to scrub off the edges. I would imagine that when our cars were built they did not have sufficiently sophisticated equipment to get the wheels set up 100 per cent.
I also had a problem with the prop shaft where the larger part had been balanced but not the shorter section and I could feel vibration through the steering. That is also now fixed, a bit late in the day after 41 years ownership but I suppose better late than never !
Years ago it was common to follow a car where you could see all 4 wheels as it went along in a straight line due to the car having been in a serious accident and then not repaired properly. My father had a friend who had a call from the police one day to tell him that the front of his Ford Escort belonged to Mr Smith and the back to Mr Brown, it must have felt strange to drive.
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Post by gingerbeer62 on Jul 18, 2016 20:19:31 GMT
As far as I can remember the chap that did it, who was actually very good, put sensors on all 4 wheels, the laser then shone from the back to the front and he wound in the offside track rod and wound out the nearside to compensate. The difference was minimal but presumably enough to scrub off the edges. I would imagine that when our cars were built they did not have sufficiently sophisticated equipment to get the wheels set up 100 per cent. I also had a problem with the prop shaft where the larger part had been balanced but not the shorter section and I could feel vibration through the steering. That is also now fixed, a bit late in the day after 41 years ownership but I suppose better late than never ! Years ago it was common to follow a car where you could see all 4 wheels as it went along in a straight line due to the car having been in a serious accident and then not repaired properly. My father had a friend who had a call from the police one day to tell him that the front of his Ford Escort belonged to Mr Smith and the back to Mr Brown, it must have felt strange to drive. So that would fix the toe in/out of the front wheels although the method your chap used is not like the method suggested on here. The back wheels are of course static, barring spring misalignment, and would not affect the front wheels. Hence my confusion. Cheers Colin
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Post by djm16 on Jul 19, 2016 2:22:26 GMT
1) The rear wheels are not adjustable. The camber castor and toe in are fixed because it is a solid axle. The leaf spring also has a locating lug to fix the position of the axle relative to the chassis.
2) There are two adjustments available on the front - the toe-in and the Ackerman angle. The latter determines the extent to which the inner front wheel in a turn is angled in further than the outer wheel. The Ackerman angle should be fixed and left that way (it is set by the length of the outer track rod ends - exactly 12 inches on a P4). Earlier Rovers had no provision for adjustment, and when I came to replace mine I welded up the adjustable outer trackrods so that nobody could fiddle with them.
That leaves only toe-in which should be set only by adjustment of the central link rod.
Where this goes wrong is when there is some play in the system: worn rubber bushes and worn TREs. You cannot compensate for this and it is pointless having tracking adjusted until this is fixed.
When I had my P4 tracked recently I stood over him while he adjusted the link arm to get 4mm of toe in. Gentle outward pressure on the wheels against the flexibility of the rubber bushes then could force the wheels out to 0mm.
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Post by gingerbeer62 on Jul 19, 2016 11:42:27 GMT
I never said that the back wheels were adjustable. My point being with the front adjustments and methods of doing that. These pictures are from the Manual and may be of help to some.
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