Andy1845c
Well-Known Member
Hey guys, wanna pick some brains on this-
I bought an older (early 2000's) Lull 644B that was a project someone gave up on. Story I got was the transmission stopped shifting, it sat and got algae in the fuel and plugged the injectors. Allegedly someone before me installed new injectors.
When I got it, it would start with either and run decent - although had a touch more white smoke that I would call normal - but even when warm the engine would not restart without either. It don't really even get much white smoke when cranking.
I pulled the injectors and did a pop test and found that they all popped at 4000 PSI. Searching the internet I see they should be set to 3500 PSI. Pulled them apart and removed the smallest shim and got all of them popping somewhere close to 3500. Reinstalled and it will restart when warm but still have to crank excessively. Sometimes it will run the battery down and not fire. Other times its start almost normal.
Still not getting a lot of smoke when cranking. Usually getting a belch of black when it finally fires.
Compression test was 400 on 3 cylinders and about 325 on 1. Sounds ok when it is running. Throttles up and idles down
I've messed with the fuel cut off. Wired it fully back.
Doesn't look like the pump has ever been off which makes me think the timing hasn't been messed with.
I am leaning toward pulling the pump and sending it off to a pump shop at this point. If there was crap in the fuel maybe it damaged the pump and I am not getting consistent pop off until the engine spins fast enough?
Anything else anyone would try first?
I bought an older (early 2000's) Lull 644B that was a project someone gave up on. Story I got was the transmission stopped shifting, it sat and got algae in the fuel and plugged the injectors. Allegedly someone before me installed new injectors.
When I got it, it would start with either and run decent - although had a touch more white smoke that I would call normal - but even when warm the engine would not restart without either. It don't really even get much white smoke when cranking.
I pulled the injectors and did a pop test and found that they all popped at 4000 PSI. Searching the internet I see they should be set to 3500 PSI. Pulled them apart and removed the smallest shim and got all of them popping somewhere close to 3500. Reinstalled and it will restart when warm but still have to crank excessively. Sometimes it will run the battery down and not fire. Other times its start almost normal.
Still not getting a lot of smoke when cranking. Usually getting a belch of black when it finally fires.
Compression test was 400 on 3 cylinders and about 325 on 1. Sounds ok when it is running. Throttles up and idles down
I've messed with the fuel cut off. Wired it fully back.
Doesn't look like the pump has ever been off which makes me think the timing hasn't been messed with.
I am leaning toward pulling the pump and sending it off to a pump shop at this point. If there was crap in the fuel maybe it damaged the pump and I am not getting consistent pop off until the engine spins fast enough?
Anything else anyone would try first?