From:Mark L Hunnibell
Subject:RE: RE: Oil Level, First Time Crank Up Date:Tue May 16 07:32:46 2017
Response to:6580
There is no pressurized oil system on the 1919. It is a "total loss" system that lubricates itself with splash "paddles" that are part of the connecting rod caps. The operation of that pump, which is pretty much just a recirculating pump, as well as the "auxiliary oil valve" is described in the manual titled, "Instructions for Operation and Care of Henderson Four-Cylinder Motorcycles 1919 Model Z-2" some excerpts of which follow [I have inserted one note to make clear the location of the location of an adjusting screw]:
Lubrication of the Henderson motor is by means of the mechanical plunger pump, driven by worm gear, which automatically feeds oil in proportion to speed. This is correctly adjusted for normal use at the factory.

If radical changes in conditions, or use of different grade of oil, should call for change of oil feed, the pump can be adjusted by turning the screw at the lower end of the pump. [note from me: this is the screw that is vertical and sticks out of the bottom of the pump assembly]

To cause the pump to feed more oil, turn this screw a trifle to the left, screwing it out.

To cause less oil to be fed, turn it to the right, screwing in.

The sight glass at the point where the oil pipe enters the gear case at the front of the motor allows the flow of oil to be observed. When the motor is throttled down to very low speed, the oil feed should be at the rate of about 15 drops per minute, or one drop per revolution of the mechanical oiler.

The mechanical oil pump will take care of lubrication at all ordinary speeds and for normal conditions. When riding at high speed, or racing, oil is burned very rapidly, however, and additional oil should be supplied at regular intervals with the auxiliary oil valve, located under the left side of the tank below the oil filler cap.

The valve should be opened fully for about ten seconds in each mile when riding wide open, as this will allow sufficient extra oil to pass through to maintain the proper level in the motor base

You should probably get a copy of that manual. Several people sell reprints of it, but if you are a member of the Antique Motorcycle Club of America, you can download it for free starting here:

Mark Hunnibell

Ok, I got it running. Only ran it for a few
seconds, sounds great. Can anybody give me
some info on how to check oil pressure?
Looks like has a pump on front and 2 oil
lines. One goes up to a sight glass and
connects right above cam on front cover ( I
dont see any oil pass through sight glass).
Other oil line goes back mid point of oil
pan. Tried to post pic, mot sure if it
loaded. Help much appreciated. Thanks

I have a 1919 Z. Good spark and carb looks
good. Ready to see if she will fire up. How
do you check / set oil level on this engine?
Motorcycle mechanic / machinist many years
but first time owned Henderson 4. Any other
tips before crank, been sitting for years.