Via the help of Black Adder I came in contact with a French M3W owner who also had a noisy bevelbox. He opened his unit and found out that the bearings on the pinion shaft where over tighten. From what I read in his answers it looks like that this didn't bring the result he hoped for. I have copied his post and let it translate by Google (sorry my French is not good enough for that)
This is his post on the French forum translated by Google:
I am once again shocked, not by imperfections made by Morgan, then I made a reason, but Quaife, the designer of the Bevel Box.
Why is it so noisy? Why neither Morgan nor Quaife does not bring the solution to the noise so unpleasant for all. I eventually dismantle so simply intend to change the pinion bearings or two bearings that hold the bevel gear alignment which results in the crown.
Being convinced that the noise comes from there, I have removed the nose bridge and found the following:
very important to toil hard spots tending to rotate the wheel by hand. Assumption: Wow, the bearings must be a big hit in the G .....
I undertake to remove the end piece which is fixed to the shaft, and then two shots impact wrench, the clamping nut move a "th" tour, and the gear becomes a facility to run, without any play. Just little noises suggesting they still suffered.
I realize I could have detonated the bevel box, or break a ball or whatever. It's hot, no wonder I was able to recover with bearings squarely HS. I had indeed felt some difficulty in advancing and retracting the three wheels, but then to think that the tapered bearings were tight to death, there they are as strong as Morgan. Now I can even throw the gear and it starts to turn again alone, whereas before, it was hard to turn by hand. Still, I will change the two conical bearings, Koyo, I went to Timken. Once removed, we can only note that this is the tightening that was excessive, the operator did not check whether the gears turning properly, he torqued and that's all.
I'll go all according to the rules of art (the old mechanical) or squeezing in approaching and no play, as soon as I feel a hard point, I will come back slightly.
Following the coming days but there is a good chance that I do not have this p ... noise that spoils partly pleasure. I hope, if only it could be that I shall be delighted.
And for those who feel the soul of an engineer, it's not that hard to intervene. The bearings are: HM88542-HM88510 HM89449-HM89410
Or make intervene the first mechanic that you find, the operation is very simple.
This is his answer to me via a PM
I'm sorry for not knowing properly speak English But I can try with the help of google translation using simple words After emptying It is possible to remove the front of the bevel box through the cockpit
We must remove the two large fixing screws on the frame and the 6 screws connecting with the back of the bevel box is very simple In this front bevel box, there are two tapered roller bearings I noticed that the large nut from the end was far too tight
I had trouble turning the pinion by hand Once disassembled, the raceways were very marked, such as bearings having very many miles. I changed these bearings respecting a moderate tightening necessary for tapered roller bearings. If you have questions, do not hesitate, I will try to help you.
