Tony Wells
Senior Member
3508 CAT sn BPX00105
I suppose this belongs under Forestry. If not, maybe some Mod could move it for me.
I have a rough running engine in my tub grinder, and have the injectors out. CAT is selling me new o-rings to reinstall them after a mild cleanup. My engine guy advises me that we should try this as a next step, since several of these seals are cracked. Cheap enough to chance it before replacing the injectors. I have a kind of twofold problem. The rough running, possibly, has caused about 3 pages of DTC's on my Diesel Lappie, but I think most are old and just stored in memory. I don't have the printout in front of me atm, so can't provide a list. But my thinking is to clear the codes if I cannot determine which are live/current and which are old, fixed and are just stored for reference and start over with no codes stored at all. Then any that pop up I know would be current. I'd like opinions on that.
The other thing is I am in need of a schematic for this engine control system, based on the overall hodge-podge of codes that are there but don't seem related either to the current rough running or the cracked injector seals. Something tells me there is a problem between the engine and fuel control modules in the harness, so rather than peel it all open and try to find an open or short, or possible bad ground, I would like to have more info. So far, I am told that CAT will furnish a complete engine diagram that includes the ECM and fuel module where I can get the pinouts for all the connectors. I believe I can find a harness issue with that information. We don't do much of our own heavy engine work, and this is about a $100k engine, so I use an outside specialist I've come to trust. Problem is, I really don't want to pay CAT $800 and wait two weeks for their manual only to use (at this point anyway) only the electrical information. But I do need to eliminate any potential problems with the electrical system. If anyone can help me locate a generic 3508 schematic, it might go a long way to help find some ghost problem. I do pretty fair on the electrical/electronics side of things, and my health doesn't let me do the heavy lifting any more so I feel I need to start there. I'm pretty well equipped with instruments of various types to test most anything common in a harness. Plus a have a decent helper to do the climbing around. He's learning.
Naturally, the manufacturer of the machine doesn't offer the same level of information as I believe I need. I want sensor outputs, ranges, etc so I can test them directly after the injectors put back and it is ready to run again. Right now I will not even turn the key. Power is locked out to protect it from dummies anyway.
So I rest it's fate in the HEF Brain Trust to guide me through this, hopefully with some insight and experience. I'll settle for good guesses though. They often lead the right direction. And as always, I appreciate any tips offered.
Some of you fine folks have my email, or maybe it's in my profile, but if you'd rather talk to me off record, feel free to contact me that way. Or PM me and ask for it. I'll happily provide it.
If any additional information will help or is needed, let me know and I'll get it.
Tons of thanks,
Tony Wells
I suppose this belongs under Forestry. If not, maybe some Mod could move it for me.
I have a rough running engine in my tub grinder, and have the injectors out. CAT is selling me new o-rings to reinstall them after a mild cleanup. My engine guy advises me that we should try this as a next step, since several of these seals are cracked. Cheap enough to chance it before replacing the injectors. I have a kind of twofold problem. The rough running, possibly, has caused about 3 pages of DTC's on my Diesel Lappie, but I think most are old and just stored in memory. I don't have the printout in front of me atm, so can't provide a list. But my thinking is to clear the codes if I cannot determine which are live/current and which are old, fixed and are just stored for reference and start over with no codes stored at all. Then any that pop up I know would be current. I'd like opinions on that.
The other thing is I am in need of a schematic for this engine control system, based on the overall hodge-podge of codes that are there but don't seem related either to the current rough running or the cracked injector seals. Something tells me there is a problem between the engine and fuel control modules in the harness, so rather than peel it all open and try to find an open or short, or possible bad ground, I would like to have more info. So far, I am told that CAT will furnish a complete engine diagram that includes the ECM and fuel module where I can get the pinouts for all the connectors. I believe I can find a harness issue with that information. We don't do much of our own heavy engine work, and this is about a $100k engine, so I use an outside specialist I've come to trust. Problem is, I really don't want to pay CAT $800 and wait two weeks for their manual only to use (at this point anyway) only the electrical information. But I do need to eliminate any potential problems with the electrical system. If anyone can help me locate a generic 3508 schematic, it might go a long way to help find some ghost problem. I do pretty fair on the electrical/electronics side of things, and my health doesn't let me do the heavy lifting any more so I feel I need to start there. I'm pretty well equipped with instruments of various types to test most anything common in a harness. Plus a have a decent helper to do the climbing around. He's learning.
Naturally, the manufacturer of the machine doesn't offer the same level of information as I believe I need. I want sensor outputs, ranges, etc so I can test them directly after the injectors put back and it is ready to run again. Right now I will not even turn the key. Power is locked out to protect it from dummies anyway.
So I rest it's fate in the HEF Brain Trust to guide me through this, hopefully with some insight and experience. I'll settle for good guesses though. They often lead the right direction. And as always, I appreciate any tips offered.
Some of you fine folks have my email, or maybe it's in my profile, but if you'd rather talk to me off record, feel free to contact me that way. Or PM me and ask for it. I'll happily provide it.
If any additional information will help or is needed, let me know and I'll get it.
Tons of thanks,
Tony Wells