The Fordson Tractor Pages Forum

Dear all,
I have totally rebuild my dexta engine (except the injection pump). It works very well: starts easy and run smoothly.
BUT: when hot, the oil pressure light is on under 1000 RPM????
How to explane this? Everything is new in this engine, including pistons, liners, valves, valves guides, bearings, and of course oil pump. As you can understand, I feel disapointed.
Best regards,
Constant

Hi,
It would be worth measuring the oil pressure with a calibrated gauge to check the oil pressure light is illuminating correctly.
All the best,
Ben

did you measure the crank to check for ovality and have it ground and os shells as it could be a bearing clearance problem and no fitting of shells will cure it only a regrind will.
change the oil pressure switch for a new one as this could be at fault.
checking the oil pressure with a guge is a good way of checking what is going on with the engine.

regards
James

A little varning about "new" oilpumps in general. I don´t know if it is the same thing with Dexta oilpumps, but when I renew my 590E engine I bought a new oilpump (of the wrong model so I returned it for two reasons), but it had over 0,2mm clearence inside when my old had 0,1 mm. So the new pump was worse than the old one. Perhaps it is the same with Dexta spare pumps.

I will check the pressure today. My guess is the same as you Grani: a bad new oilpump. Does anyone have that experience with a Dexta oilpump??
Have a nice day,
Constant

Hi guys,
the problem is solved: James was right, the oil pressure switch was faulty. I had one new in stock, did a replacement and everything works fine now.
Have a good week-end.
Constant