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new injector, now can't fire up

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tyssniffen:
So, after messing up my injector and creating a leak, I finally put in a new one.  Sounds great, with a nice tight squeak every squirt.

BUT, after a good crank, I can only get a couple of fires; it doesn't actually keep up.   Sounds a bit like low fuel, but it's definitely squirting...  so, somehow, the compression is messed up?    I had this experience maybe 5 times - crank, pull the lifter, fire, fire... die. 

How did it start up and run for hours with a leaky injector, but now, with a shiny new one, it won't?  I feel the new injector is definitely seated properly.  The top of my exhaust valve pin is definitely worn - could there be slack in the valves that somehow the leaky injector was covering for?

Anyway, any advice on what to do would be welcome.

ajaffa1:
Sorry to hear the new injector did not solve your problems. There are several things that will stop a diesel engine from running:
1. fuel injector/injector pump issues causing insufficient fuel to be injected. Perhaps there is still air in the fuel injector lines or the element in the injector pump is worn, also check that the rack on the injector pump is fully open, the older Bryce injector pumps had a starting pawl that over fueled the engine for easier starting, the later Bosch Mico pumps don`t have this facility.
2. Compression or lack of it, worn piston rings or poorly fitting inlet or exhaust valves can cause loss of compression as can wear in the big and little end bearings.
3. Dirty air filters can restrict the amount of air available for combustion
4. Blocked exhaust system preventing expulsion of waste gases.

My best guess is that there is still air in the injector line or you have a sticking exhaust valve. Try giving the exhaust valve a couple of taps with hammer.

Let us know how you go.

Bob

38ac:
Doubtfull that it is compression related. I assume you can hear the injector creak when hand cranking it? Start it and let it fire twice and quickly throw the decompression lever and listen for the injector to creak as it coasts down. I had a 3/1 Lister here with very similar issues that had been in 3 shops and they couldn't figure it out. The pintle wasn't seating in the tip and when that happens and the engine fires it pushes air into the injector and engine dies. :o

tyssniffen:

--- Quote from: ajaffa1 on December 12, 2022, 06:47:41 AM ---
1. fuel injector/injector pump issues causing insufficient fuel to be injected. Perhaps there is still air in the fuel injector lines or the element in the injector pump is worn, also check that the rack on the injector pump is fully open, the older Bryce injector pumps had a starting pawl that over fueled the engine for easier starting, the later Bosch Mico pumps don`t have this facility.
2. Compression or lack of it
3. Dirty air filters can restrict the amount of air available for combustion
4. Blocked exhaust system preventing expulsion of waste gases.
My best guess is that there is still air in the injector line or you have a sticking exhaust valve. Try giving the exhaust valve a couple of taps with hammer.

--- End quote ---

thanks for this reply. quick responses:
1. this actually seems like a real issue. messing around today, I put a spoonful of one of those 'injector cleaners' down into the chamber (by removing the injector for a moment) and cranked it and it fired a few more times than before, but then coasted down again, as though it wasn't getting fuel.

2. Nothing has changed except the injector swap - I do worry about my system being dirty/old/loose, but the thing was firing up no problem with the leaky old injector, so while I wonder if something about the proper amount of fuel (rather than an over-abundance from the old injector) is somehow revealing the lack of perfect compression??

3. I've had the intake filter off for a few days... while I'm sure there's build up of carbon everywhere, I don't think it's an air-in problem.

4. my exhaust system is a funky one, I have to admit... but again, it was working last week with the old injector. I did in fact take out my 4 foot horizontal run exhaust pipe as I was concerned about blockage, and the thing was just fine.  I then hooked it back into the rest of my muffler-ing system... perhaps I'll give it a try with just 4 ft of straight pipe tomorrow, just to see... but again, seems odd to suddenly develop this issue.

I love the idea of a hammer being the solution... and you mean, take the rockers off and smack it?  but isn't the rocker arm moving it up and down already (I see it moving) so how could it be stuck?

about air - I've cranked this thing to no start at least 20 times by now, and don't even pull the holder until I'm hearing the squeak of the injector... I've had air troubles in my time, but it seems crazy that it would be that.

tyssniffen:

--- Quote from: 38ac on December 12, 2022, 07:10:30 PM ---Doubtful that it is compression related. I assume you can hear the injector creak when hand cranking it?

--- End quote ---
I am hopeful it isn't compression related.  yes, I can hear a tight creak while cranking.


--- Quote from: 38ac on December 12, 2022, 07:10:30 PM --- Start it and let it fire twice and quickly throw the decompression lever and listen for the injector to creak as it coasts down. I had a 3/1 Lister here with very similar issues that had been in 3 shops and they couldn't figure it out. The pintle wasn't seating in the tip and when that happens and the engine fires it pushes air into the injector and engine dies. :o

--- End quote ---

I hear the injector creak as it coasts down yes, but IT DOES seem like it skips one creak when it's already slowing down. Is that similar to what you're talking about?

what does one do about a pintle not moving correctly??

and, of course, I should (confess?) that I bought this injector off eBay from India, thinking there couldn't be much difference between them.   I see now that the thing might be able to be adjusted for different 'ats'?  could there be something I need to do to this injector to have it do more or less spray?

a quote from the eBay page:

"A direct equivalent of the CAV injector used for Lister CS & JP Engines. CAV Holder Type BKB50S507B. Nozzle BDL30S46. Set at 90 ats. for engine types: CS 5-1, 6-1, 8-1, 10-2, 12-2 and 16-2 engines but also suitable for use with the 3-1, 3.5-1, 10-1 and 20-2 engine types when set at the correct pressure."

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