1800 B oil pressure

I was messing around will my sickle bar and my 1655 a few days ago after running it at pto speed for about 10 min I noticed my oil pressure gauge was at 10 psi I took the tractor back up to the house and shut it off left it setting about 20 min and went back and looked the gauge was still on 10 psi. I had it hooked to a seed drill today and had 30 psi at idle starting using it pulling the drill at a little more than idle and noticed it had dropped down to 20 psi this tractor has had a motor swap ad 1800 b in it now. Could this just be some sludge that has gotten in the oil line to the gauge or could this be something more ???
 
The first thing I would do is take the line on the back of the gauge off and crank it over and let some oil come out to clear the line of oil that's in it(let a good bit out). Put the line back on and start it and see what it does then. If it does the same thing as before get another gauge and screw it in the block ware the oil line for the gauge hooks in and see what it does then. If it does the same thing as before then at least you know its not the gauge but something else.

I know this might be a dumb question to ask but how many hours were on the 1800B engine before the swap? And what kind of oil did you put in it? Bandit
 
I know I will get beat up for this but, That oil is to thin for the engine. Its a 50 year old engine that when it was new called for SAE 30W oil and 10W-40 when in use below 32*. So with and engine with unknown hours I would run a good 30W diesel oil and add 1 bottle of STP oil treatment per gallon of oil in the tractor, It cant hurt but it can help an engine. But that is what I would do, Its up to you. I have never had a problem doing this with any of the older engines I have and use.

I look at it like this, Have you ever seen 15W-40 that has been run for 10 min (warmed up)and drained that didn't look like water? But 30W still looks about the same (thicker) run for the same amount of time. Old engine older style oil, New engine new style oil simple as that. Bandit
 
15W/40 is a thicker grade oil than straight 30.

It is a misconception to think otherwise. The 15W refers only to cold starting, where there is clearly no problem with the oil pressure. It is at the operating temperature of the oil where the the problem lies.

I would think there is either too much bearing clearance, the pressure relief valve is not seated properly or the oil pump is getting worn. Of the three, I suspect the second as the most
likely culprit and easiest to fix. Next up would be crank bearings with excessive clearance (bearings or shaft).

Engine oil does not heat to full operating temperature in ten minutes from cold in my experience.

RAB
 
First off I'd hook up another gauge at the block to check the pressure reading.If it came up the same I'd change oil filters and put 50W diesel oil in it.
Sounds like some rod,main or cam bearing work might be coming up.With that 1800 engine I wouldn't wait to long.
 
Is this a gas or diesel? First off? If it's a
gas or diesel changing oil to a thicker oil
after noticing a pressure drop is the worst
thing possible to do! First things first I'd
check to see if the gauge is correct with
checking a gauge that is known to be correct.
2nd. I'd check to see if the engine is "making
oil" ie; diesel fuel in the oil. If it is a
diesel. That's what I'd start with. Not going
to a thicker oil.
 
(quoted from post at 02:09:34 03/18/15) Is this a gas or diesel? First off? If it's a
gas or diesel changing oil to a thicker oil
after noticing a pressure drop is the worst
thing possible to do! First things first I'd
check to see if the gauge is correct with
checking a gauge that is known to be correct.
2nd. I'd check to see if the engine is "making
oil" ie; diesel fuel in the oil. If it is a
diesel. That's what I'd start with. Not going
to a thicker oil.
I second that motion and move for a vote, check for increased oil level due to oil dilution. Could be a failed lift pump leaking, or a front injection pump seal (your tractor has a roosa-master if I recall correctly). Now due to the extensive use it is possible to take out your main bearings with the fuel thinning of the oil. If it is not making oil change to the !!!!CORRECT!!! oil as called for by manual. (I prefer shell rotella for my diesels IMO)
Mike
 
dont disagree on bearing problems or something other then oil wieght , but i will tell ya the book calls for 30w and use it, not 15w-40 i understand how oil wieght works but 30w will have more oil pressure , have tryed it , in a 1855 (310-TD)
 

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