Indian four oil pump adjustment.

[Ivor]

Thanks Larry,
I don't know what the compression poundage of the spring should be. So, going back to basics, I now understand that too much oil pressure can erode the babbit, and from all of the information that I have seen, I feel comfortable with setting the spill pressure at 40lbs. BTW, I have just found this mentioned in a Indian 4 overhaul manual ; Gear oil pump, Adjusted pressure 30 pounds.
Maximum pressure after motor is warmed up - 15 pounds minimum. Light oil.
I'm assuming that this is a pressure gauge reading on an assembled motor.( Allowing for leakage from around the bearings )
Anyway, I'm testing the pump, just as in Roy's video and the pump reaches high pressure evan when turned slowly and takes a little time to drop to zero after I stop turning the pump. No noticeable end float on the oil pump shaft and it doesn't feel like it's binding either, so 'all-in-all' I feel happy with the pump.
What I have done is, cut the spring length down, so when the adjuster is wound in half way, the oil spills at 40lbs.
Thanks again for all your help, and I hope I'm not responsible for any grey hairs ! But this site is my only life-line.

[L Burke]

Ivor,
You are tenacious like a bull dog pup! Good approach on the spring. I urge you to set spill with a modern gauge....then read with your original US gauge and note the difference in reading......and remember it...for me that is sometimes hard to do, like to many PIN numbers.

[Ivor]

Yes, I went and got a new gauge as you recommended on one of your first replies, it reads in BAR, but translates to read 5lbs less than my original gauge.

[L Burke]

Ivor,
Hope all goes well with the 4, know it is frustrating, but persistence with a 4 is important!
Merry Christmas to you and yours.

[Ivor]

Thanks for those kind and supportive words Larry. It all took a turn for the worst yesterday when the front engine mount fell off ! I explained in a reply to my torque setting post.

Here's wishing you and yours a merry Christmas and a happy new year as well !
Ivor.