Petter AA1 diesel pump

[drmcw]

Hi, I'm new to the forum having bought a water pump with an attached Petter AA1 diesel engine.

I knew it was a non runner and I bought it as a project for fun although a decent water pump may well come in handy.

I believe I have identified the reason the engine won't start and it's the diesel pump.

The governor has an arm that pivots and moves a toothed slide over the body of the pump which in turn rotates something inside the pump that adjusts the flow of diesel and thus adjusts the speed of the engine to its set fixed speed.

The arm moves freely but the sliding part doesn't move. It's this part https://injectionpumps.co.uk/product/bryce-faoar-pump-control-rod-11-116/  I know the arm moves freely as you can pop it off the sticking up ball and move back and forth.

I would remove the pump but the sticking up ball bit on the slide has to line up with a cut out in the casting and it's in the wrong position and won't move.

Can anyone make any suggestions as to what I can do?

I have tried filling the pump with penetrating oil but I suspect it doesn't reach the gummed up part - the engine will have stood with filthy diesel for a long time.

Mike

[listard-jp2]

This is a common problem on "Petter A range" diesel engines that have stood for some time.

When last run the engine was stopped with the fuel injection pump in the no fuel position which is at the far end of the rack travel (and this is the position the injection pump has seized in), but to get the pump out of the engine crankcase you need the pump rack to be in middle rack position.

The only way to get round this problem is to remove the timing cover and gently tap the rack operating lever until the rack is in the mid position. Thus, allowing the injection pump to be removed.