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Post by Andrew Huxley on Mar 11, 2005 14:24:05 GMT
18 months ago the gearbox in my 1969 P5B ceased to function and I had it rebuilt. After only 1500 miles and 9 months of use reverse gear all but disappeared. The guy who did the rebuild took it back to fix and even though he has had the box out twice since I am still having problems. when first starting I often still lack reverse gear. It does eventually come in and when it does is tight and effective. I am not a very technical person (just love Rover P5B's ) but am trying to learn things as I am not actually rich enough to continue to be a cheque book owner.(The fuel bills are quite enough). Is this something I should really worry about or is common? Is it the bands or is it some pressure related issue? Do I live with this idiosyncrisy or can I fix it? Second query is hydraulic tappets. Are they fully automatic and cannot be adjusted at all? I always thought my garage was correcting them at each service as the car always ran smoothly afterwards but the garage I have just visited says they cannot be altered and that it is the oil change that brings them back on song. is that correct? Hope someone can clarify for me. I think I may have to become a regular for simple questions but I know there are loads of you out there prepared to share your wisdom. Thanks in advance Andrew
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Post by Roy Fellingham on Mar 11, 2005 15:02:48 GMT
My answer to your questions is like this.
If I paid to have my gearbox overhauled then it should be working! There shouldn't be anything wrong with it at all. This guy who is doing the work for you has obviously missed something (providing you have the correct level of oil in the box).
Regarding the tappets, yes they are manual and require no maintenance, being hydraulic means that they maintain their own clearance until they are worn out. As oil gets older the chemical links that are in it become broken and the oil becomes less sticky and more water like. This can be heard in the engine usually because it becomes slightly more noisy and the oil pressure can drop. Changing the oil restores the properties of the oil and quietens down the engine.
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Post by Smallfry on Mar 11, 2005 19:20:23 GMT
If your gearbox has been PROPERLY rebuilt, is correctly adjusted, and the oil is of the correct type and at the correct level, it should work perfectly.
No doubt this guy will claim thats it is because you do not use it much. You CANNOT recondition an autobox on the cheap, unless you do it yourself, paying more for the necessary parts, and nothing for the labour.
The tappet noise you are hearing is a classic case of the camshaft being worn out. It always improves for a while after an oil change. If you examine the camshaft you will find that some of the lobes are worn, with one or two of them being almost flat.
The other symptoms will be difficulty in getting the engine to idle slowly and smoothly, and it having almost, but not quite, a misfire. Its not easy to describe, but the engine should be rock steady at idle, not shaking about. Also, if you pull off the HT leads on by one, you will discover that an two or three cylinders, it makes nearly no difference to the running of the engine.
Sorry
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