TO 20 oil pressure guage/ Other questions/Long Pos

Is there a way to verify oil pressure other than the guage. It appears to be working and stays in the middle for the most part, however when I am under a load and need more throttle the pressure dips until I rev it up a little. Bascially, If I can calibrate a measurement on guage with PSI, that might give me some peace of mind. It is hard to trust a 50 year old guage.

Also, is some discharge from coolant exhaust normal. I had a few splatters of bright green on my distributor after recently plowing a ditch.

Lastly, I was told by the person I bought tractor from that the serial number was gone because battery leaked and ate them away. Are there any other number to help identify?

On the opposite side of housing, the battery acid actually ate all of the way through. I have a hole about the size of a quarter. Would the proper way to patch be JB weld?

thanks to all, great forum. This support network and the passion all of you contribute weighed into my decison on buying the tractor. (Just got it Saurday)

To get the SN of the tractor 1st varify the model. As it could be a TE-20.

1) Verify engine is a Z-120. (Cast number lowe left of engine) If yes then you had a TO-20 or a TE-20
2) look at gear shift cover plate. If a stand alone cover then it is a TO-20. (i.e bolted down on four sides). If it is integral with the steering column then it is a TE-20. (i.e. bolted on three sides and front is one piece with the column)

3) if a TO then the SN is at the top of the plate and will be "TO ######" if a TE then the sn is at the bottom of the plate and will read "TE #####".

Carefully remove the over paint and see if you can get the SN. The SN is stamped into the brass plate.

Jeff

As an engineer, I have never liked pressure gauges without numerical scales. You can buy a gauge that has numerical markings on it and for this series of Continental engines, the operating oil pressure on a new or rebuilt engine should be 25-30 psi (30 psi is the relief valve pressure setting); between 20-30 psi at 2200 engine rpm on any engine and the minimum acceptable pressure at idle is 15 psi. That's what the Ferguson Shop Manual says.

For your piece of mind. If you have any oil pressure you will be fine. rebuilt pressures of 30psi cold and 20 psi warmed up on a hot summer day are normal. Worn pump pressures as low as 10 psi are acceptable.

If you want, get a different replacement pressure guage. Couple post below your discusses nice replacements available,

The SN was on a plate that mounted on the steering column, It is hard to see how a batter leak could harm the sn plate. A battery leak could harm the engine SN plate which is mounted just above the starter.

Hote this helps
Jeff