injection pump timing?

[Justin]

i am going to time my injection pump by ear and performance and i know that i need to advance the timing just a little bit so which way do you turn the pump for advanciing it??

thanks in advance
justin

[chrissev]

i am going to time my injection pump by ear and performance and i know that i need to advance the timing just a little bit so which way do you turn the pump for advanciing it??

thanks in advance
justin

ummm, don't do that.  Just touching it can throw the timing right out, and the tolerance is very small.  If you want advanced timing, just drive with the cold start pulled out.

[Justin]

my dial indicator isnt in yet and it seems that when my cold start lever is pulled out (timing advanced) it clatters a little more, but for some reason i think that it doesnt turn off at 1500 rpms on mine, because if i keep it pulled out then when it is time to shift it is still running strong and smooth, if i have the lever pushed in then it seems to miss and wants to studder

any thoughts?

[jtanguay]

heh sounds like my car... when its warm though it doesnt miss.. only on a cold startup.  Maybe its all in my head, but I think I get crappy mileage with it pulled out???

[QuickTD]

If your cold start advance continues to have an influence at RPM's above about 1500 I would suspect that the internal transfer pump in your injection pump was not up to snuff. Injection pump housing pressure controls the advance and it should be high enough by 1500rpm to push the advance piston off of the cold advance cam. It should not have any effect on mileage, unless of course you are cruising around at 1000rpm.

[fspGTD]

The RPM point where the cold start knob no longer matters, according to the SAE papers, is actually approx 2000 RPM.  Do you have a tach?  I would suggest that if you do not have a working tach, that you probably aren't really conscious of what RPM you're actually shifting at.

The difference the cold start makes should also gradually taper off approaching 2000RPM.  It should be most noticeable at starter motor cranking RPM (which would be, 300RPM or so if the starter and battery are working as designed I believe), less noticeable at idle RPM, and even more progressively less noticeable approaching 2000RPM.  Sometimes people don't notice a difference at idle, and claim it makes no difference at starting.  :wink:

[Dr. Diesel]

if your pump's fuel return banjo bolt doesn't have OUT stamped on it, you'll not get any dynamic timing advance as you increase RPM. Check the out banjo and make sure it says out. if you've got an inlet bolt on the outlet, then the coldstart knob will make a difference at all rpms.