The Fordson Tractor Pages Forum

Today I fired up newly rebuilt super major, she started very quickly very smoky. I ran her about 1/4 throttle up to temp. retorqued head and set valves to 12 and 15. Double checked pump timing right on 23 degree. removed exhaust manifold, ran her again intermittent puffs of white smoke at each cylinder, also oil passing out exhaust ports. I cracked fuel lines while running to bleed, fuel blasted out at each injector. Reckon I should reassemble tractor and put her to work for good break in ?. What are your thoughts? Oil pressure held at 42 psi whole time. Rebuild included new piston and sleeves, new cam and lifters, bearings and rebuilt injectors, new valves and guides, skimmed head. If interested I did post videos on Modified Majors site on facebook.

Good stuff, you'll want to get ploughing soon to clear the smoke.
Sandy

Oil pressure is spot on, so all is well with the rebuild.
The oil coming out of the exhaust ports will be unburnt diesel oil.
You didn't mention the injection pump. Did you have it overhauled? If not, suggest that you do.
Once done, do this to get the rings to bite.

Adrian is right, you need to take the injection pump to a fuel injection specialist and have it checked out. At the very least it will need re-calibrating and the phasing re-setting. As these inline pumps wear in use the cam lobes and cam followers wear at different rates for each cylinder so that eventually different quantities of fuel are injected to each cylinder on the same throttle setting and moreover the fuel is injected at different degrees before tdc for each cylinder. The timing procedure sets the injection point for number 1 cylinder but when the pump camshaft and follower for number 1 cylinder have worn in use this procedure will not produce an accurate injection point. Re-calibrating the pump ensures that the same quantity of fuel is injected to each cylinder, re- setting the phasing ensures firstly that the injection point of number 1 cylinder coincides with the scribe line on the pump timing plate and then that the injection point of each subsequent cylinder is precisely at 90 degrees after the previous cylinder. Recalibration and setting the phasing was a standard service procedure for these engines when they were in full time use, usually around 5 or 6 thousand hours unless there were problems beforehand.

Good point on the injector pump, but be aware it's very expensive, which I think is one of the many reasons it very often isn't done.
Sandy

If all that is needed for the injection pump is recalibrating and the phasing re- setting it is mainly a charge for the time involved plus a side cover gasket, so it should not he too bad and well worth it in my view. If other work is needed, well it needed doing anyway and if you have gone to the extent that you have in the rebuild why spoil the last lap to perfection? If the pump is faulty you will never be happy with your tractor.

shepp wrote: ↑

Sat Jun 18, 2022 8:39 pm

If the pump is faulty you will never be happy with your tractor.

Agree 100%.
Sandy

I used Welham Diesel, Leicester to completely overhaul my Super Major pump, very good service, pump spot on. Was £375 for complete rebuild including all parts. Maybe worth a phone call

That's a very good price, especially with so many new parts.
Sandy