Retirement is great when you have a hobby like this to keep busy with!
Hi George, 100% agreed.
One of the last functional things to adjust, there at the valve train, the bevel gears.
First the up right shaft had to be cut to the right length.
For position check of the small gear some washers are added to keep it temporally.
Looking at the situation in place at the second picture, I have been a bit surprised.
The angle of both bevel gears engaged didn´t look as expected and the sound of the motion was strange too.
For a better check I took them out again.
Some head scratching and irritation was the result after holding them in my hand like in the picture.
The first idea was, to have a look in the file folder, because there I have kept all labels from the wrapping.
The printed part numbers are right, the Boston catalog says, this are the numbers for a set of bevel gears with 18 and 36 teeth.
Looking more detailed to the small gear, I could see the part number stamped into it, it says G461Y.
After another detailed view, I recognized this as the part number of an 18 teeth miter gear.
There is only one place where a miter gear is used in this engine, that is at the lower end of the upright shaft.
I have bought all Boston gears for this engine in one lot some time ago.
So the upcoming question, did I have made a mistake and the wrong gear is soldered into the spur gear down there ?
To get it clear the lower gears has been disassembled and checked alone.
As seen in picture 33, everything fine.
Than I took the 36 teeth bevel gear for the cam shaft and made the visual check like in the last picture #32, it did not match.
So it was clear now, lower ratio and gears are correct.
One is stamped with G461Y, 18 teeth miter gear, the other one, soldered into the spur gear is the same and this lower pair does match each other.
So the very easy conclusion now, everything fine, excepted the very last upper ratio.
Labels from packing are right, but one gear was wrong.I have bought all Boston gears via Amazon so far, the easiest and cheapest way concerning freight cost also.
It was coming via U.K. for less than EUR 10. May be today after the Brexit history also.
Looking nearly one week dally into the Amazon offers, this only gear as a replacement was currently not available.
If have found an industrial dealer in the Netherlands, he has offered me the missing miter gear, only as a bunch of two for nearly EUR 150,00.
It was still possible to order by one of the known American dealers, with a similar result concerning cost.
A new conclusion was coming up my mind which means, Achim it is time to say good bye to imperial ratios and gears.
It was easy so far using the imperial stuff of the shelf, no modification of surrounding design was necessary.
But I have to realize also, that currently "global" means the same as much more difficulties for me as a simple Model Engine Maker.
An order in the U.K is a nightmare too in the meantime.
In my understanding it is a pity, that after years of coming closer together in this world, the things are developing opposite way now again.
But for this case I have found an easy solution with some metric bevel gears, available of the shelf from the German company Mädler.
