With my build now reaching final stages ( abou f..kn time after 8 years) I decided to put in a reverse box. To cut a long story short I removed my 1 piece prop to make space for the new props. After reading a couple of topics on thsi forum related to vibration, adoptors coming loose etcc.. I went on to check my my stuff and this is where I got shocked.
Upon ratating the adoptor flange freely, I noticed that the there was free play along the splined shaft. I also noticed that the outer diameter seemed to rotate eccentric as well so I removed the plate and had it checked on a measuring machine worth over £50K. Here are the results measured taking the spline diameter (engine shaft) as datum:
The outer diameter was off centre by 1.5mm!!!
The prop shaft mounting holes PCD as ok but the PCD was again offset in relation to the splined shaft PCD by 0.3mm
The faces back and front were not paralell and offset by 0.25mm!!!
I wll not mention the name of the company from where i bought the flange as it is beyond my scope but my message is: please do check that this item is manufactured to the highest tolerance possible as the probability is that there are some more out there in the same condition if not worse!
I have now had it machined with new holes (PCD) and everything is sqaure, through and paralell at a cost of 3 times more than what originaly paid. Do not assume that what you buy is of good quality...
