01 lb7
Registered User
well would the timing even need changing for bb codes?
Pensecola does not have the best reputation around here. I would remove those injectors and have them pop tested before you even consider touching the timing. I guarantee you they are not right based on what you say!
The guy that just "rebuilt" my injectors told me the following for timing by ear.
Install the "new" injectors, take the pickup out run till normal temps, shut it off and restart, dont wait for the glow plugs to cycle.
If it starts without much "turning over" it's close, then wait exactly 15 min.(actually wait that long, time it) Then after 15 min restart without waiting for the glow plugs to cycle. Engine should start with few revs. If the engine needs to whirl over then timing should be advanced. (advancing meaning the width of the mark movement).
Granted this is kinda vague, but its by ear. The guy has 20+ years rebuilding pumps of all kinds, pickups, tractors, etc.
Just my .02's
because they were leaking
remans from pensacola
old
no idea
no
no
but i wasnt complaining of blue smoke and roughness before i changed them. i replaced them because one or more was leaking and evertime i started it after it sit for more than an hour or two and it would miss and blow white puffs then clear up, and they had never ever been changed, the dates were 7/93 on em! what exactly are you looking for on the ' how did they look ' part? now it is constant blue and runs rough at 2k, but it could possibly still have some air bubbles it hasn't run more than 2-3 minutes, but it fires right up 100% better than before just slightly missing, 250k on truck was runnning great before except for start up for a few seconds
I know you say the injectors are an " unknown " variable but I just don't buy the injectors making it do this yet.
Ok so I just ran it for a half hour or so to make sure no air was in the system, and at idle, it is very shakey, raise it above 1k is normal and 2k it has a very slight miss, like one every5-10 seconds. Would you still say injectors or could it be that the pump isn't opening the injectors correctly. I know you say the injectors are an " unknown " variable but I just don't buy the injectors making it do this yet. And I understand everything that has been said thus far, I just don't want to miss something that could save a lot of time
the input pressure didn't make any difference at the same volume, as any excess would have just flowed out the bypass via the return line back to the tank, but a difference in pop pressure from a new injector, or even a different old injector will change the injection timing.I'm fairly sure that timing meters using the pulse method measure the pressure spike in the injection line which the injection pump delivers to fire the injector. Therefore I don't see how the timing meter would be able to tell a lick of difference between timing with new vs old injectors, even if they pop at different pressures, because the surge of pressure happens at the same time regardless of what kind of injector is attached to the end of it. The timing meter doesn't know when the injector opens, only when the surge of pressure happens in relation to crankshaft location. Unless it somehow senses when the pressure surges then drops off, which would actually measure when the fuel is injected, which would change with new or old injectors.
I would love for someone to measure timing with old, worn out injectors and then with new, and see if timing changes. I doubt it would be much if any measurable difference. I know that there has been speculation that changing feed pressure to the IP changes timing, however our member RLDSL did a test where he changed the pressure from low to high end of the range and checked timing, and it didn't budge.