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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Prop shaft centre bearing.Views : 2263 Replies : 43Users Viewing This Thread : |
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Oct 25th, 2020, 11:46 | #21 | |
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I have a pit so access is easy. Thanks |
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Oct 25th, 2020, 12:10 | #22 |
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It's nothing more than the magic of physics - the propshaft is already balanced so will try to regain this balance when rotated if it's slightly out of line. If the bracket is in the wrong place (a fraction of a mm can be a lot!) then allowing the bracket to move slightly when the vibration happens means it will self-align.
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Oct 26th, 2020, 09:55 | #23 |
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I removed the whole shaft to check the spline alignment (it was correct) and when replaced, the vibration was less. Put that down to chance.
However, the bearing adjustment is only fore and aft which cannot adjust the deviation from a straight line (well only minutely). Despite that, I will do as directed. I have found this forum very helpful and non critical (unlike some!). Edit;- just remembered the bearing is not self aligning. Last edited by GrahamWright; Oct 26th, 2020 at 10:42. |
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Oct 26th, 2020, 09:56 | #24 | |
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Oct 29th, 2020, 11:05 | #25 |
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I have had two attempts to cure the vibration without success. The first was half a turn on the two bearing housing screws, the second a full turn.
Do I keep turning? There has been a slight improvement but still rumbly. I have checked the shaft to see if any of the balance weights had detached during the man-handling to remove the original bearing and split the spline but nothing is apparent. |
Oct 29th, 2020, 11:34 | #26 | |
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Are you sure you got the diagnosis right in the first place? What's the ride height, measured from the centre of the rear wheel vertically to the wheelarch?
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Oct 29th, 2020, 12:41 | #27 | |
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The bearing housing was disintegrating so diagnosis probably correct! Up to 40, there is no vibration. Starts at 40 and continues upwards. Same coasting out of gear. The bearing is new and came with the housing. The original bearing was moulded to the housing - the new one is a force fit. Would its longitudinal position affect anything? There is around 15mm to play with. Last edited by GrahamWright; Oct 29th, 2020 at 14:27. |
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Oct 29th, 2020, 12:44 | #28 |
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The ride height varies with the load and is "exercised"! I can measure with no load.
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Oct 29th, 2020, 14:16 | #29 |
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Yes please and also test drive without any load too!
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Oct 29th, 2020, 16:21 | #30 |
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What was the brand of the new bearing carrier that you installed?
Do you have picture of it? The reason i ask is because its 2 versions of bearing carriers and one of them is too stiff and will create the vibrations you describe. The more solid version of bearing carrier showed up a few years ago and a lot of people have had problems when they have installed it. The only way to solve it is to replace it with the old version. You can see pictures of the 2 different versions on the link below, the top picture is the new version that creates vibrations. https://www.jagrullar.se/forum/viewt...1612&start=190 |
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