The D6 Pony is different. The floor of the pony motor is actually the top of the flywheel housing and the oil drain is a passage through the flywheel housing.
All the original manuals I have indicate that the starting motor is splash lubricated and is a stand alone system, not connected to the D6 in any way.
So am I to understand that the hole is ONLY for and somehow connected to a drain plug?
I am contemplating brazing the hole shut and when an oil change is needed I can use suction to remove the old oil in the starting motor.
I appreciate all the feedback. The starting motor has been the main issue since I acquired "Bessie". She was always a reliable machine for the previous owner and I was lucky enough to acquire her when my friend passed a few years back. We pull started her to get her loaded up and let her idle for the hour ride home. Purred like a big cat kitten. One of the pony blocks has a broken skirt on the bore and cannot be used unless I get it sleeved. It was the block I had wanted to use since the bore was untouched since new. The other block is already been bored .020 over and finding pistons and rings have become a challenge to say the least. I have two good pistons that can be used but they are standard bore. The oil issue with the pony is what caught my attention because it appears both ponys failed due to lack of lubrication. I should have NEVER tried to fire them without going through them. Some learn the hard way. She will come together eventually and I will get her out and about on the back forty to "play". If anyone knows of any sources for the pistons and rings I would be grateful for the lead.
Will keep the site posted on my progress. Thanks again
You can pick up new pistons for whatever size you want from JP Pistons in Oz. The website is https://www.norndaautomotive.com.au/jp-pistons/find-parts/jppistonsproducts.html?make=Caterpiller&model=D6%20(D4600)%20Starter%20Engine%20RBP and the pistons are JPO-152. You'll need to talk to them about your oversize and I think, unless they have some already on the shelf at 020, you can just get your local machinist to whittle them down. I believe they supply at 060 and you whittle to whatever you need
"i reject your reality and substitute my own" - adam savage. i suspect my final words maybe "well shit, that didnt work"
instead of perfection some times we just have to accept practicality
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