Originally Posted by rama
You have the flo torq 111, hub as supplied with all 1.5l optis, these are designed to reduce prop rattle with stainless props,
they should have +- 10 degrees of rotation and between 0.7620mm and 3.1750mm of end play
The brass castellated splined spacer supplied with the engine measures 118mm in total length which as you say this probably is a flo torq 111 hub, as supplied with all 1.5l optis, but unfortunately the brass castellated splined spacer is too long for the prop I have fitted, as it is noticeable that as I tighten the retaining nut it feels as though it comes to a sudden halt with a spanner as if the spacer has bottomed out before the prop becomes tight. When I removed the prop and inspected it you could see that the brass castellated splined spacer is about a couple of millimetres too long as it protrudes beyond the two piece plastic flo torque insert that also came with the engine. I have replaced this for one which measures 60mm total length from a flo torq 11 hub, and there is absolutely no play in the prop, and as it is tightened with the spanner you can feel it removes all the play in the prop. I have tightened the retaining nut to what feels right, but would be grateful if anyone could supply me with the correct torque value so I can check if it is set up correctly.
Thanks for the useful replies, I feel a lot happier with my prop set up, if I had ran the engine as it was it may have caused some damage.