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[DBS88]

The oil pump is driven directly from the engines crankshaft, so a 1 to 1 ratio, the first photo shows the pump as its been removed from the engine assembly.
The oiling system use three valves, the first is a non return valve at the base of the pump, the cam driven piston forces oil past the stainless steel ball and into a pipe - second photo.
The pipe carries oil up to a second valve attached to the top of the oiling cup. The valve lifts and allowing oil to pass to another pipe, at the same time excess oil is also returned via an overflow back to the oil reservoir - third and fourth photo
The pipe from the second valve carries the oil to the metering valve, which is a needle valve with a lock nut, adjusting the needle valve controls how much oil passes into the steam line. It is the excess Oil that can't pass the needle valve on each pump stroke that is returned to the reservoir. Photo 5, 6 and 7 show the steam line, the oil arrives at the bottom of the red valve body then passes into the steam line.
Hope this makes sense?

[1967Brutus]

It does make sense...

I would have expected that the oil flow would be controlled by throttling the return to the tank, that way forcing oil into the steam line, but the other way around also works, I guess.

[DBS88]

Here is a better photo showing the pipe the carries the oil from the valve at the top of the steam oil reservoir to the metering valve and into the steam line.


The reassembled oil pump was reinstalled and connected to the engines crankshaft. Then using a cordless drill to slowly rotate the engine the operation of the pump was checked, oil passed up the pipe and to the regulator and also out via the overflow back into the oil resivoir - success!


No, not success, the oil did not enter the steam line, the regulator was either blocked or closed. I therefore dissassembeled the regulator, cleaned it and reassesmbled it. I then set the regulator so I could hear air passing through it, knowing this would allow too much oil to pass. When I turned the engine over again, oil passed into the steam line, so 3 problems with the oil pump had been fixed.


The last job with the oil pump is to finalise the the oil flow to the steam line, which will be trial and error, by screwing down the regulator a bit at a time until the full oil reservoir takes an hour to an hour and a half to reach empty

[1967Brutus]

which will be trial and error, by screwing down the regulator a bit at a time until the full oil reservoir takes an hour to an hour and a half to reach empty

no different than an adjustable displacement oiler, or even the cylinder lubricators of the big marine twostroke diesels I used to work with...

Setting lubrication rate on those took me several days (engine running 24 hr/day) if I had to do it inbetween jobs, and at least 5 or 6 hours if I could focus on just that job alone (which was rare...).