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Post by quadecz on Jan 4, 2014 21:09:10 GMT
Hi everyone.
Today we got Tina, my 55 estate running and mobile for the first time since 1981 but I have a few questions about the belt set up:
If I run the transmission in drive with the wheels off the ground both sides change ratio but do so at different rates (the belts are new). Is this normal as in operation on the road they would have to work as a matched pair in a straight line?
I'm having difficulty getting correct adjustment on the belts with the offside one seeming slacker than the nearside so the gap between the pulley faces on the secondaries won't match.
When I turn a tight corner eg. A three point turn it feels like I'm getting axel wind up, you can feel the rear tyres fighting the tarmac when you move. Is this normal due to the lack of a proper differential.
Any thoughts most welcome thanks, Richard.
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Post by 33grinder on Jan 4, 2014 22:19:32 GMT
They should ideally be running at the same rates. The adjustment slides the secondaries forwards/backwards as a pair and individual adjustment is not possible. It's likely to be something internal that is causing the problem but someone more technically minded will be able to explain in more detail. The axle wind-up you describe on tight turns is right as there is no differential effect like on regular cars with a fixed rear axle.
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Post by macplaxton on Jan 4, 2014 22:42:49 GMT
If I run the transmission in drive with the wheels off the ground both sides change ratio but do so at different rates (the belts are new). Is this normal as in operation on the road they would have to work as a matched pair in a straight line? Each side should be doing approximately the same thing, if noticeably different, there's a problem. I'm having difficulty getting correct adjustment on the belts with the offside one seeming slacker than the nearside so the gap between the pulley faces on the secondaries won't match. Gaps should be 1.5mm - 2.00mm, and within 0.5mm side-to-side. If this isn't achieved, then swap the belts over from one side to the other. If still not achieved, then there's a problem. When I turn a tight corner eg. A three point turn it feels like I'm getting axel wind up, you can feel the rear tyres fighting the tarmac when you move. Is this normal due to the lack of a proper differential. Normal, it's the limited slip (of the belts) differential effect. Here's my 44 with the same arrangement in action. Both sides do the same. I've seen a 55 do the weird one-sided thing, but I don't know what the final cause was. |
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Post by quadecz on Jan 5, 2014 8:48:58 GMT
Thanks for the replies, I suspect either the range of movement on one of the sliders is slightly restricted or one side of the primary drive has got a bit lazy. Its probably a bit optimistic to expect it to work OK after thirty years of being unused. Further investigation next weekend I think.
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Post by quadecz on Jan 5, 2014 13:21:26 GMT
@ macplaxton - mines not as bad as the one in the second video you posted fortunately. Mine does seem to have the full range of movement and the belts do end up in the same positions and hold there, it just look like the adjustment is slower on side than the other. I'm suspecting now its just all due to lack of use.
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Post by Nick on Jan 6, 2014 22:05:46 GMT
or even something as simple as a slightly dragging brake  |
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Post by macplaxton on Jan 6, 2014 23:33:56 GMT
The one in the second vid was reported to always want to throw the offside rear of the car over the white line. The secondaries had the same ratio each side. Don't know if the primaries had the same governor weights. Pulley clamping spring may have been bust in the offside secondary. Whatever it was, it was most certainly the offside that was too quick going high ratio, rather than the nearside being too slow. |
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Post by quadecz on Feb 2, 2014 22:08:50 GMT
So here's an update on how Tina's running.
I tightened the belts up as they were very slack and put a 2mm gap between the pulleys. My manual says 3mm for new belts but I went a bit lower as they've done a few miles. The transmission is working beautifully but I can feel the belts going round (which I expect to some extent). The main issue now is the vibration from the transmission: at over 60mph the vibration through the car is evil, similar to driving at speed over cobbles. Its worse on a steady cruise and eases when more power is applied. Its got new Roflex belts.
Is this normal with new belts till they bed in or should I worry? Its nasty enough that 70mph is unsustainable.
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Post by macplaxton on Feb 2, 2014 22:25:37 GMT
My manual says 3mm for new belts Ignore the manual. Time has moved on. 1.5 - 2.0 mm is fine. The main issue now is the vibration from the transmission: at over 60mph the vibration through the car is evil, similar to driving at speed over cobbles. Its worse on a steady cruise and eases when more power is applied. Are you 100% sure it's the transmission and not some other rotating component?? |
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Post by macplaxton on Feb 3, 2014 0:24:54 GMT
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