135 runs then stops

witzend

Member
OK, next stop is the Funny Farm.

Tractor starts really easily, any weather. Runs perfectly between 10 minutes and 45 minutes.

Then, out of nowhere (though revs usually rise just before) the engine cuts out.

After bleeding the fuel system it restarts.

I've tried:
New primary fuel filter and housing.
New thermostart tank and associated pipework.
New rubber olives throughout the fuel system.
Reseated glow plug (which doesn't work and seems pretty pointless) with ptfe and fibre washer.
Fuel tank removed and rinsed with clean diesel.
Fuel tap and filter removed and cleaned.
New fuel lift pump fitted.
Fuel tank brim full.
Doesn't seem to be any water in the filters (doesn't run long enough for it to build up!)

This is really driving me crazy as the tractor is great in all other respects, but this is making it useless.
 
You say that the engine restarts after bleeding the system - when you do this do you get air from the bleedscrews?

You make mention of replacing the rubber seals on the fuel pipes so I presume that you have fuel pipes with a crimped shoulder for the rubber seal
to sit against and form the seal. If this is what you have then carefully check each pipe union to ensure that there are no cracks or wear at the
point where the union nut presses on the crimped shoulder as it is tightened.

Ray.
 
Check for a plugged constant bleed fitting on top of the filter base, it's there to remove any trapped air in the system. When it gets plugged any trapped air then goes to the injection pump, causing engine shut down. It's usually a banjo bolt with a small bleed hole , or could be a straight fitting that's connected to the injector top leakoff line that goes back to the tank. Also could be incorrect filter installation, if NAPA/WIX filters are used. The filter top outer groove is the fuel inlet, the mistake of putting an O ring in that groove happens a lot. That can stop or severely restrict the fuel flow and cause problems too. You say a new feed pump is in place, with the engine running and the injection TOP bleed screw is loose fuel should come out. If it doesn't the supply pump is not working correctly. Any one of these problems can cause the exact problems you're having.
 
Hi Ray,
Thanks very much for getting back to me. All the new pipes have those "factory" flared ends, but will check carefully ...

BTW, in the huge wide world that is Yesterday's Tractors it was a pleasant surprise to come across such a near neighbour: I was in Dover this evening as it happens. Do you get your spares at Arter's?
 
Hi Dieseltech,

Much appreciate the response – between you and Ray UK i'm going to have a busy Saturday splashing around in fuel oil. Will keep you posted.
 
What a small world, are you local to Dover?
I have used Arters for spares but not recently, I don't own or use tractors but like to keep a track on what is happening in the tractor world
especially the 100 series Massey Ferguson tractors that I worked on during my days at Lenfields Canterbury. Following their closure I came to
work in the Port of Dover where I remained until I retired.

Returning to your problem 135 there is another possibilty to consider and that is to check that the operating lever of the fuel lift / feed pump has
been placed on to the correct side of the camshaft when it was fitted to the engine. I have seen cases where the pump lever has been fitted on
to the wrong side of the cam which restricted its movement / flow of fuel not to mention destroying the camshaft.
Ray.
 
Absolutely, who'd have thought it?

I'm not a big user of tractors myself, this one is just to control a very few acres of paddock (brambles) and because I really like the way they were built.

Bit of a concern about getting the wrong side of the camshaft: if something can be fitted upside-down or inside-out, no matter how difficult it might be, I'm the guy. I'll add it to my list of checks and thanks very much for the warning. Looks like it's going to be pretty blowy and wet tomorrow, good shed weather!
 
It's official, I have now spent more time trying to fix this problem than actually using the tractor ...

Have acted on all Ray UK's and Dieseltech's suggestions, problem persists. (Incidentally there are usually some air bubble from the upper bleed screw on the injector pump. Once
these are out and after 30 seconds, at least, cranking on full, it usually starts. Have hardly ever had to bleed at the injectors themselves.) Currently it will only run for less than 5
minutes. Also, have tried running with the non-standard fuel cap off in case this was creating a vacuum but no change.

If I can't sort this I'm going to have to get some help in, do you know anyone locally Ray? Payment in wine ...
 

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