18-04-2022, 10:00 PM
I have now separated the block from the crankcase and this enables one to see the action of the jets.
Using a hypodermic syringe I can squirt fluid through the jets and see where it lands on the crankshaft.
It is immediately apparent that the jets do squirt onto the crankshaft, but in each case they miss the troughs. As suggested by one poster, it would appear wise to widen the troughs?
All other oil passages flow freely including those to the remote oil filter and from there back to the crankcase.
I did find evidence of a Mason Bee nest under one of the valves, so this does give credence to Ian's though about a Mason Bee somehow blocking an oil jet or crankshaft?
The Number 2 big end shows signs of just beginning to break down with the crankshaft lightly scored at one side.
Using a hypodermic syringe I can squirt fluid through the jets and see where it lands on the crankshaft.
It is immediately apparent that the jets do squirt onto the crankshaft, but in each case they miss the troughs. As suggested by one poster, it would appear wise to widen the troughs?
All other oil passages flow freely including those to the remote oil filter and from there back to the crankcase.
I did find evidence of a Mason Bee nest under one of the valves, so this does give credence to Ian's though about a Mason Bee somehow blocking an oil jet or crankshaft?
The Number 2 big end shows signs of just beginning to break down with the crankshaft lightly scored at one side.