I have had an annoying higher speed vibration on my car ('74 TV8 BW 35 auto) for ever. Improved no end when I renewed the prop shaft, rear drive shafts, and gear box mounts. (All of which needed changing for other valid reasons). But still residually there, and these things annoy out of all proportion to their actual magnitude!.
I was thinking that maybe the new prop shaft was either improperly aligned (UJ wise) or not balanced properly, it was that kind of frequency, a vibe of the kind I have had and cured in other cars by attending to the prop shaft..
Last weekend, I had to change the cooling fan viscous coupling. I knew this was on its way as it had started to spin around more than it should (following advice here) when flicked by hand, and it finally let go with all the usual loud noises. At the same time, I treated the car to a new fan as well.
Although I have an electric fan as backup, I believe in keeping the original engine driven fan to keep under bonnet temps down.
The repair went smoothly, even the crank pulley bolt co-operated. I took the opportunity to thoroughly flush the rad (much silt removed, even though I flush the system annually) and block, (not much silt in that).
All back together, new antifreeze, no airlocks, no leaks. Marginal improvement in cooling, not that I really had a cooling issue anyway, even on v hot days like last Saturday (32.6C for us).
But the most amazing thing is - that vibration has gone, and the car is smooth as you like at all speeds. Makes for a far more relaxed drive. Just how it should have been all along.
I would personally not have thought that a rad fan assembly could cause a vibration like I had, but we live and learn. Hope this helps someone else in the future.
I was thinking that maybe the new prop shaft was either improperly aligned (UJ wise) or not balanced properly, it was that kind of frequency, a vibe of the kind I have had and cured in other cars by attending to the prop shaft..
Last weekend, I had to change the cooling fan viscous coupling. I knew this was on its way as it had started to spin around more than it should (following advice here) when flicked by hand, and it finally let go with all the usual loud noises. At the same time, I treated the car to a new fan as well.
Although I have an electric fan as backup, I believe in keeping the original engine driven fan to keep under bonnet temps down.
The repair went smoothly, even the crank pulley bolt co-operated. I took the opportunity to thoroughly flush the rad (much silt removed, even though I flush the system annually) and block, (not much silt in that).
All back together, new antifreeze, no airlocks, no leaks. Marginal improvement in cooling, not that I really had a cooling issue anyway, even on v hot days like last Saturday (32.6C for us).
But the most amazing thing is - that vibration has gone, and the car is smooth as you like at all speeds. Makes for a far more relaxed drive. Just how it should have been all along.
I would personally not have thought that a rad fan assembly could cause a vibration like I had, but we live and learn. Hope this helps someone else in the future.
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