grahamwatson wrote: ↑Sat May 20, 2017 5:37 pm
I have recently cured a similar sounding vibration on another classic (Volvo Amazon) by correcting the prop shaft phasing. This involves making sure that the front and rear yokes are in the same orientation, and have not gone "out of phase" by being incorrectly reassembled at the central spline.
Not sure if this is relevant on a Dolomite but it is a simple fix and may be worth a try if your yokes are not aligned.
A Dolomite has a split prop too and, as with the Volvo, out of phase means out of balance too! This could certainly cause the problem and there is nothing to see apart from the misalignment of the UJs - which is easily missed!
Steve
'73 2 door Toledo with Vauxhall Carlton 2.0 8v engine (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine (The Dolomega)
'72 Triumph 1500FWD in Slate Grey, Now with RWD and Carledo powertrain!
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out of phase means out of balance too! This could certainly cause the problem and there is nothing to see apart from the misalignment of the UJs - which is easily missed!
How can you tell if the UJs are misaligned? The Haynes manual tells you to make a scratch on each surface but what if that has not been done?
I have the same vibration on my 1850 which happened after some work was done including changing the center bearing.
You need to compare the orientation of the front and rear UJ yokes. So if the front yoke of the front UJ is upright (i.e. UJ sockets at 12 o'clock and 6 o'clock), the front yoke of the rear UJ should also be upright. If you find that is not the case, you need to disengage the central spline joint and re-engage it on a different spline so that the yokes are aligned.
Hope that makes sense but there is some good stuff on google and youtube which will make it clear!
The scratching is usually done to the UJ flanges, where they connect to the rear of the gearbox and/or the front of the diff. This may preserve the balance but does not assist with the phasing.
If you have checked the phasing and also lined up any scratches, but still have a vibration, you should disengage the central spline and re-engage it 180 degrees, as that will preserve the phasing and may eliminate any imbalance.
I would check all the exhaust hangers too and check for the exhaust system fouling anywhere. The exhaust will twist slightly from its idle position when drive is applied and if clearances are small it may be just enough for it to knock against the body or running gear somewhere.
hi everyone,
many thanks for all the tips
it did turn out to be propshaft sinc, having re aligned it it is 75% better
so it hardly noticable now, i might try balancing with the old hose clip method if it starts to annoy me.
a big thanks to all cheers, tony.
cheers, tony.