'87 3CX Perking 4.236 Injector Pump Problem
Posted: Sun Jun 27, 2021 2:04 pm
Ok, so it's been a while since I've had an actual fault with the JCB, but now I seem to have one :/
Yesterday I ran out of fuel while moving a soil mound about, or at least I thought I did as the engine died suddenly and wouldn't restart. My fuel gauge is duff, and you can't dip the tank as there's an elbow and a gauze in the filler neck.
So I grabbed a jerry can and transferred over 15 litres or so of *cough* heavy fuel oil, went round bleeding the fuel system, and on the third circuit of injector line cracking it fired into life. Rather than carry on digging, I decided to bring the JCB back to the yard and put more fuel in. It was getting late by the time I'd completed the palaver of fuel transfer so didn't fire the engine up, leaving the JCB blocking the exit from the yard to the field...
This morning I went out to fire up the JCB and while it cranks it won't fire, I've been going round trying to bleed the fuel system again and am getting nowhere, in a change to yesterday's bleeding session I don't seem to be getting any fuel worth mentioning coming out at the injectors, just the slightest dribble after about 30 seconds cranking on each injector, cracking on of the unions on the back of the pump distribution housing has the same effect. Pleanty of fuel comes gushing out of the two bleeds on the pump body and atomiser, just not after the distributor.
Cracking the fuel line from the mechanical pump to the engine mounted filter sees pleanty of fuel there, but it is less energetic on the other side of the filter on the feed to the injector pump, and actually seems more lively on the bleed back from the injector pump to the filter.
Before I go removing the injector pump and getting myself into a world of pain and trouble trying to 'fix' it, can anyone shed any light on what might be going on?
Could it be a clogged filter? In that there's enough fuel getting to the injector pump for it to pressurise internally, but not enough to make it out of the pump to the injectors themselves?
Yesterday I ran out of fuel while moving a soil mound about, or at least I thought I did as the engine died suddenly and wouldn't restart. My fuel gauge is duff, and you can't dip the tank as there's an elbow and a gauze in the filler neck.
So I grabbed a jerry can and transferred over 15 litres or so of *cough* heavy fuel oil, went round bleeding the fuel system, and on the third circuit of injector line cracking it fired into life. Rather than carry on digging, I decided to bring the JCB back to the yard and put more fuel in. It was getting late by the time I'd completed the palaver of fuel transfer so didn't fire the engine up, leaving the JCB blocking the exit from the yard to the field...
This morning I went out to fire up the JCB and while it cranks it won't fire, I've been going round trying to bleed the fuel system again and am getting nowhere, in a change to yesterday's bleeding session I don't seem to be getting any fuel worth mentioning coming out at the injectors, just the slightest dribble after about 30 seconds cranking on each injector, cracking on of the unions on the back of the pump distribution housing has the same effect. Pleanty of fuel comes gushing out of the two bleeds on the pump body and atomiser, just not after the distributor.
Cracking the fuel line from the mechanical pump to the engine mounted filter sees pleanty of fuel there, but it is less energetic on the other side of the filter on the feed to the injector pump, and actually seems more lively on the bleed back from the injector pump to the filter.
Before I go removing the injector pump and getting myself into a world of pain and trouble trying to 'fix' it, can anyone shed any light on what might be going on?
Could it be a clogged filter? In that there's enough fuel getting to the injector pump for it to pressurise internally, but not enough to make it out of the pump to the injectors themselves?