mclarkva
Registered User
I am a little confused on the the timing and the advance cam on the DB2 injection Pump.
Working on a 1989 F350 that seems to have timing issues, maybe some drippy injectors, and a bit of low compression miss on cylinder 3. (Aside: I have had 2 engines fail at cyl 3 one cracked cylinder wall- a Reviva reman and another lost rod bearing -what's up with cyl 3?)
Anyway the timing seems weird - using Rutunda with luminosity (have the pulse module but the Rotunda tool is 1982 and doesnt seem to work with the pulse mudule) If i set the luminosity into cyl 1 and set the timing offset to -20.0 and then set the timing at 2000rpm to 8.5 when dropping back to high Idle (its a refer truck and idle is set to 900RPM) I see 14 deg on the Rotunda ?!
Is this right? - well the truck can barely get moving out of a parking spot set like that and very smokey. So i retard the timing significantly from this carefully adjusted point and with idle at 900rpm at no more than 10 deg the truck will move nicely but by 2000rpm the timing is less than 4 deg still smokey. To clear most of the smoke (other than the #3 miss problems) and have the truck still move but not very powerful the timing ends up near 0 at 2000rpm and about 4.5 at 900rpm idle and of course its a bit harder to start.
I dont understand this IP timing behavior - is the IP advance cam gone wrong? it does seem to move the plunger ok from the outside view.
I have a rebuilt IP in a box and a reman set of 8 injectors and a pop tester at the ready, ive also arranged for a reman engine so i can pull this one to work on Cyl 3 but the refer truck is in use almost daily and we dont want to take this delivery truck out of service so I would like to get this running better until we can swap the engine - I am just obsessed with understanding why it is doing this and what I am not understanding - school me please!
Working on a 1989 F350 that seems to have timing issues, maybe some drippy injectors, and a bit of low compression miss on cylinder 3. (Aside: I have had 2 engines fail at cyl 3 one cracked cylinder wall- a Reviva reman and another lost rod bearing -what's up with cyl 3?)
Anyway the timing seems weird - using Rutunda with luminosity (have the pulse module but the Rotunda tool is 1982 and doesnt seem to work with the pulse mudule) If i set the luminosity into cyl 1 and set the timing offset to -20.0 and then set the timing at 2000rpm to 8.5 when dropping back to high Idle (its a refer truck and idle is set to 900RPM) I see 14 deg on the Rotunda ?!
Is this right? - well the truck can barely get moving out of a parking spot set like that and very smokey. So i retard the timing significantly from this carefully adjusted point and with idle at 900rpm at no more than 10 deg the truck will move nicely but by 2000rpm the timing is less than 4 deg still smokey. To clear most of the smoke (other than the #3 miss problems) and have the truck still move but not very powerful the timing ends up near 0 at 2000rpm and about 4.5 at 900rpm idle and of course its a bit harder to start.
I dont understand this IP timing behavior - is the IP advance cam gone wrong? it does seem to move the plunger ok from the outside view.
I have a rebuilt IP in a box and a reman set of 8 injectors and a pop tester at the ready, ive also arranged for a reman engine so i can pull this one to work on Cyl 3 but the refer truck is in use almost daily and we dont want to take this delivery truck out of service so I would like to get this running better until we can swap the engine - I am just obsessed with understanding why it is doing this and what I am not understanding - school me please!