25-07-2018, 09:25 AM
OK, I was able to blue up and work out where the interference was with the valves. I was going to try plasticine but I couldn't get any and in the toy shop I asked in first the guy didn't know what it was! I have some engineers marking blue so I used that. I just needed to grind the corners of the chambers a bit more square. I checked all the volumes matched and that there is no interference with no head gasket so that's all good now.
The issue now is twice a rotation there is a clicking noise. It took me a while to track down where it was coming from but it's from the cam and crank gears. I have plenty of backlash, perhaps too much because what is actually happening is at certain points in the rotation the cam gear jumps forwards fractionally. As it goes off one tooth and starts to engage the next. You can actually see it happening. Nothing is tight and the sound isn't there with the block off so I imagine it's to do with the pressure of the valves and springs on the cam shaft as it rotates.
Is this what is meant by noisy with gears that don't mesh well? I imagine in a running engine it would make quite a racket!
So do I have to find a better meshing set of gears?
The issue now is twice a rotation there is a clicking noise. It took me a while to track down where it was coming from but it's from the cam and crank gears. I have plenty of backlash, perhaps too much because what is actually happening is at certain points in the rotation the cam gear jumps forwards fractionally. As it goes off one tooth and starts to engage the next. You can actually see it happening. Nothing is tight and the sound isn't there with the block off so I imagine it's to do with the pressure of the valves and springs on the cam shaft as it rotates.
Is this what is meant by noisy with gears that don't mesh well? I imagine in a running engine it would make quite a racket!
So do I have to find a better meshing set of gears?