FX4S
Member
- Posts
- 76
- Location
- Sierning, Austria
Hello all - haven't been on in a long time because I haven't had any problems - until now!
A recap - I run a London Taxi with the LR Defender 2.5 NA diesel (with Sherpa timing case).
The engine was rebuilt by Turner Engineering about 18 months ago, and it has been running like a dream - even took it up the highest mountain road in Austria (bit of black smoke uphill on kickdown, but who cares) with no problem.
Over the last couple of weeks, I've noticed starting up was taking longer than it used to. It would normally glow and start as soon as the key was turned. But now, it takes a few turns before it catches - no problem I thought. Then, coming back home on the motorway recently, I heard a 'pop' noise, followed by a ticking noise, while at the same time, I started belching out white/blue smoke and lost power - on tickover, it sounded like a bag of spanners. I was able to get off the motorway and arrange a tow truck back home.
Immediate suspect was a timing problem with the injection pump - after removing the cooling system, I checked the timing marks on the crankshaft, camshaft and pump - all perfect. I have 2 spare injector pumps, so I put my original one back in and went back the timing mark set-up again, together with a locking pin in the side of the pump which fits into a notch in an internal part, so to the best of my knowledge, the timing is spot on. Bleeding the system is where I've hit a problem - the lifter pump primer lever has no bite to it - I've turned the motor by hand 1/8th turn at a time to see if the lifter pump lobe was causing the problem, but couldn't find a best position to pump the lever. I've managed to bleed the filter, and get fuel to come out of the bleed screw on top of the injector pump. Getting air free fuel up the pipes to the injectors is useless, so I've tried turning the engine over for more pressure - I can get #2 injector to drip diesel, but this ain't no hight pressure I'd expect from an injector pump!
It turns over, and "feels" like it wants to start, but I suspect either air somewhere, or there is no pressure/blockage somewhere?
So I'm back to the suspicion that either my old injector pump is playing silly buggers (worked fine before the engine rebuild), or my lifter pump isn't working - does the lifter provide such a high pressure supply to the injector pump? The fuel tank is new, and it has been running fine, so I'm open to suggestions of where I should look next?
Thanks for any help, hints or suggestions, and sorry for the long wall of text!
A recap - I run a London Taxi with the LR Defender 2.5 NA diesel (with Sherpa timing case).
The engine was rebuilt by Turner Engineering about 18 months ago, and it has been running like a dream - even took it up the highest mountain road in Austria (bit of black smoke uphill on kickdown, but who cares) with no problem.
Over the last couple of weeks, I've noticed starting up was taking longer than it used to. It would normally glow and start as soon as the key was turned. But now, it takes a few turns before it catches - no problem I thought. Then, coming back home on the motorway recently, I heard a 'pop' noise, followed by a ticking noise, while at the same time, I started belching out white/blue smoke and lost power - on tickover, it sounded like a bag of spanners. I was able to get off the motorway and arrange a tow truck back home.
Immediate suspect was a timing problem with the injection pump - after removing the cooling system, I checked the timing marks on the crankshaft, camshaft and pump - all perfect. I have 2 spare injector pumps, so I put my original one back in and went back the timing mark set-up again, together with a locking pin in the side of the pump which fits into a notch in an internal part, so to the best of my knowledge, the timing is spot on. Bleeding the system is where I've hit a problem - the lifter pump primer lever has no bite to it - I've turned the motor by hand 1/8th turn at a time to see if the lifter pump lobe was causing the problem, but couldn't find a best position to pump the lever. I've managed to bleed the filter, and get fuel to come out of the bleed screw on top of the injector pump. Getting air free fuel up the pipes to the injectors is useless, so I've tried turning the engine over for more pressure - I can get #2 injector to drip diesel, but this ain't no hight pressure I'd expect from an injector pump!
It turns over, and "feels" like it wants to start, but I suspect either air somewhere, or there is no pressure/blockage somewhere?
So I'm back to the suspicion that either my old injector pump is playing silly buggers (worked fine before the engine rebuild), or my lifter pump isn't working - does the lifter provide such a high pressure supply to the injector pump? The fuel tank is new, and it has been running fine, so I'm open to suggestions of where I should look next?
Thanks for any help, hints or suggestions, and sorry for the long wall of text!