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tailshaft unis in phase . What does this mean?
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Hi i have a vibration problem at speed 100 km plus . Checked all suspects and diff and gearbox angles . Someone said checkthat your unis are in phase !! What does this mean ? Thanks
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I dont know what car you have or"phase"but try this..1. mark your tailshaft,take it off and turn it 180 degrees and try that.. 2. failing that, check for balance or a bent shaft,next up is uni joints stuck or sticking and in good condition.see how you go,,!
Jim in Adelaide.. |
Jim in Adelaide.. |
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Phasing refers to the yoke on the ends of the tailshaft being parallel. It has more to do with truck or 4wd shafts that have a spline in them that allows the shaft to change length as the axel moves up and down. As far as I know most car shafts have the yolks welded to the shaft and rely on the shaft sliding in and out of the gearbox spline. This would mean that if the yolks are like this then the unis cant be out of phase.
I think the vibration could be something as simple as wheel out of balance. Are the unis worn out, is the shaft unbalanced?
I could be wrong on my definition of phasing but I know it is to do with how the unis are in relation to each other on the shaft. If they are wrong they will work against each other and cause heaps of vibrations and probably all the time .
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Hi If you dont cure your vibrations, post up what model you have and which engine trans combo you run, some body will then possibly have some product knowledge and be able to help you out.
1st- ensure your wheels are balanced as above and none of the tyres have cord separation.
2nd- ensure your uni joints and the engine and transmission mounts are good.
3rd- some vehicles with lockup convertors can vibrate if a plug lead is breaking down.
BIT OF TRIVIA HERE !, we once had a VN in the shop where I worked in the early 90,s that was just vibrating at 100 kph so after every one else had replaced plugs,leads,coil packs and the transmission with no success, we just fitted a new thermostat as it was running cold and all was good.
Didnt you just love what early VNs could throw at you.
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wbute is onto it here - commodore tailshafts have a centre CV joint (25 or 26 splines) so when you're re-assembling the tailshaft, in phase (or 0 degrees) is when they line up.
Some models had them out of phase - 90 degrees is common, but some also had a strange phase like 14 degrees - which is basically 1 spline off centre.
Cheers,
Mick
_______________________________________________________________
Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
Cheers,
Mick
_______________________________________________________________
Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
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I'm sticking with my answer!..lol
Jim in Adelaide.. |
Jim in Adelaide.. |
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Got my tailsharft balanced and straightened .The guy reckoned it was way out of wack.Didnt cost much and new unis aswell.(hk model)
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Just because they are welded together doesn't mean they welded them in the right spot.
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tailshaft unis in phase . What does this mean?
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