TCPDRETIRED218
Member
I have just recently pretty much restored a 1960 Minneapolis Moline Jet Star.
Heads,valves, engine bored to.42 over, new pistons, rings,rods, mains etc. The machine was done by a machine shop.
Hears the deal, I bought the tractor in non running condition. Pistons Seized up!! Got the engine torn down as far as I could, and took it to the machine shop for the engine work, and did the rest of it myself.
Once I got it all put back together got it started up and with a little fine tuning it runs fine, expect for the oil preasure
Start up and engine cold it holds around 25lbs of pres. Once warms up to operating temp. The oil preasure fluctuates with the R P M's. An idle 600/700 rpm the oil preasure gage reads about 3 or 4 lbs. Bring the engine speed up to 800/900 rps oil gage comes up to around 23/24 lbs
When I shut off the tractor the oil guage drops past the 0 preasure reading on the M M gage about a 16/32 inch
Is the low oil preasure the result of a faulty gage ( the way it goes past 0 psi when shut of)
Does adjusting the pres from the pump to the motor the useing the adjustment on the side of the block be enough difference to increase the oil preasure .AT Idle
Should I change out the oil pump?
Looking for some ideas. You guys have helped me out in the past, could you try to do it again ?
This is only the 2nd tractor I've done extensive work on, the first being a 1948 Ford 8n
Thanks sorry for being so long winded
Heads,valves, engine bored to.42 over, new pistons, rings,rods, mains etc. The machine was done by a machine shop.
Hears the deal, I bought the tractor in non running condition. Pistons Seized up!! Got the engine torn down as far as I could, and took it to the machine shop for the engine work, and did the rest of it myself.
Once I got it all put back together got it started up and with a little fine tuning it runs fine, expect for the oil preasure
Start up and engine cold it holds around 25lbs of pres. Once warms up to operating temp. The oil preasure fluctuates with the R P M's. An idle 600/700 rpm the oil preasure gage reads about 3 or 4 lbs. Bring the engine speed up to 800/900 rps oil gage comes up to around 23/24 lbs
When I shut off the tractor the oil guage drops past the 0 preasure reading on the M M gage about a 16/32 inch
Is the low oil preasure the result of a faulty gage ( the way it goes past 0 psi when shut of)
Does adjusting the pres from the pump to the motor the useing the adjustment on the side of the block be enough difference to increase the oil preasure .AT Idle
Should I change out the oil pump?
Looking for some ideas. You guys have helped me out in the past, could you try to do it again ?
This is only the 2nd tractor I've done extensive work on, the first being a 1948 Ford 8n
Thanks sorry for being so long winded