Hi Jim,
No I dont mind at all. I am more than Happy to be able to share what I know. Without this forum I would have been lost multiple times.
Here are some Pictures:
There is a thread somewhere here talking about these modified Pumps. Someone used to make them. I have tried to get in contact with him but I believe he is not active anymore.
Some facts I know:
-The pump is not a high Capacity one. Its the early type. (Unfortunately)
- It has metal plates screwed on the outside, which are fitted with a rubber sealing. They seal of the ends of the pump gear shafts. This is against wet sumping. See pictures.
-For the same reason, the gear shafts are also sealed on the other side (towards the cam shafts).
- Then the high pressure valve is fitted. As can be seen on the pictures. Inside there is a metal ball pushed against the overflow oil hole, by a spring.
- The pump was also reworked. Meaning the pump housing was sanded down in order to lower the endplay of the gears. I have an article that describes on how to do this for our pumps. It even provides the desired endplay values. I can share if you like, and if I find it. I have noted down the values from the article in order to not loose them:
Oil Pump :
Teeth to Housing = 0.002“
end Play = 0.003“
shaft play = 0,002“
Oil in Sump after running: 200-300ml
Now to the gauge and the oil pressure:
I have a completely reworked Engine. With freshly grinded crankshaft barings. I am running modern 20-50 oil, with the old felt filter and a modern oil filter in the scavage line.
Before i had freed my pressure relief valve I was seeing up to 100 or more psi when cold.
Now with a self selected spring that fitted into the valve, I am seeing 60psi constantly when cold. Even at idle.
When hot pressure starts to drop down to about 20psi at normal cruising revs. 50km/h 4th gear.
At idle she puts out about 10psi when hot. (I like to have her idle at the lowest revs possible. Because I like to listen to her slowy ticking over)
When comming from a long run on the highway at 37degrees Celsius outside, I could see the pressure to go down even below 10psi. Which has me worried a bit. If any body can sooth my soul there that would be nice.
That pretty much wraps it up I guess.
I would be interested in what kind of problems you are seeing with your pump. Would you mind telling us ?
If you have any more questions, let me know.
Cheers Yves