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Bad oil pressure on dexta

D

DaveA

New User
I have a 1958 dexta diesel with bad oil pressure When I first start it the pressure is 45 to 50 lbs After 15 to 20 minutes use it drops to about 5 lbs any ideas on how to fix thanks
 
That's usually a sign of worn/loose main and rod bearings when pressure drops that much as oil warms up. What weight oil is in engine? Too light oil can cause it also.
 
As Dieseltech says, what oil are you running in her? 15/40W does not work well in these old engines according to my oil supplier. He recommends 20/50W and that is what I use in all my old tractors both diesel, petrol and petrol/kerosene models. They are working tractors not show queens. ;0)
 
Hate to be the bearer of bad news, but running "thicker" oil isn't going to do anything. Been there done that many times and it doesn't help a bit.

Was running straight 30, put in 20W50, oil pressure was the same if not worse.

Unfortunately the engine needs to be overhauled, and that is going to far exceed the value of the tractor AFTER the engine is overhauled. That is assuming you can find parts for a low-production tractor like a Dexta.
 
Do not know what you call a low production tractor, there were possibly
100,000 plus Dextas made between 1957 and 1964. Parts are still readily
available and not costly. Some engine parts are common to the MF35 and 35X
range.
 
Like others have mentioned, the bearings are getting loose. A lot depends what the tractor is being used for. For every day use a rebuild should be done. It has 5 pounds. The bearings are getting oil. The old chevy 6 motors only had a scoop that would pick up oil on every revolution of the rod. Meaning the rods had 0 oil pressure. they operated like that up until the early 50's.If the motor is not hamering I would just keeping using it. Stan
 
(quoted from post at 08:52:16 08/30/22) Do not know what you call a low production tractor, there were possibly
100,000 plus Dextas made between 1957 and 1964. Parts are still readily
available and not costly. Some engine parts are common to the MF35 and 35X
range.
Click to expand...

Interesting. I rarely see any Fordson tractors in my travels, not even specifically Dextas. Average 1 farm auction a week. This year I've only seen one Fordson, a Super Major as I recall. Fords with way less production than 100,000, are all over the place. Any Fordson is a RARE sight.

You'd think with 100,000 made there would at least be a couple at the tractor shows.

They must all be over in Europe.
 
Look around for the oil pressure regulator, or it might be in the pump itself. Make sure its not stuck or having a broken spring before you strip the motor down.
 
A Dextra is a pretty handy tractor worthy of a rebuild if it comes to that. Dad used FMDs to skid logs before he bought a skidder, they are one tough rig.
 
Main bearing jurnal on crankshaft is bad. Same problem as you have but it was a Ferguson TO30. Bought with good oil pressure when looked at and bought but when warmed up working no pressure. It was only one spot on crankshaft and as being a main no noise like a rod would have. Ended up thecrank was ground, only supposed to go to 3000 under but to get it to work had to do 4000 and it was good for several years before I traded it off. Been too many years to remember for sure but only part of the jurnal was worne away, and a rib of correct size still on the shaft. I am thinking the rib was on center of bearing with both sides gone. So part was still tight and could not be detected even with pan off, had to take the bearing caps off and problem was as plain as day or night. I had bought it at a dealer but a different shop did the work, close and Dad went to school with the owner of the shop that was the Ferguson dealer. The Dealer I bought the tractor was a Ford tractor dealer quit a bit away but they did have the crank turned. This was in the mid 60's.
 
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