Clipper
New Member
Progress, but...the saga continues...
My original post, "4300 dollar repair bill"
http://www.dieseltowingresource.com/showthread.php?t=6417
I had white smoke on startup...You guys said "air in the system,"
Couldn't find air leak, 6.5 expert diagnosed it as a bad injection pump. Changed out pump, problem not solved. After weeks of wrestling with the problem, it seems that several of my fuel hoses started leaking at once...so...YOU GUYS WERE CORRECT! AIR LEAKS!!! ):h :mad2:
I have (had) clear braided polyurethane hoses (due to my WVO setup) that are only a year old. Because of the braid, the leaks were acting like a check valve...letting air in, but not showing a leak under pressure. Finally the leaks got worse and started to leak fuel out, that's how I diagnosed the problem.
So I had the expert put the old IP back in. He warns me that the timing ring is sticking intermittently...swapped out stepper motors, the timing is still not advancing...sometimes. (intermittent problem.)
But...he is willing to buy back the new pump from me, leave the old pump in, and take it off the bill.
And the truck is running fine with the old pump, EXCEPT:
When I start it, hot or cold, it starts easily, normal little puff of white smoke cold. Runs well for about 5-8 seconds, then suddenly the idle RPM drops for about a second or two, and I get a LOUD diesel rattle. After a second or two, the loud rattle stops, and everything is fine for the rest of the time I'm running it.
If I use no throttle on startup, the loud rattle (and RPM drop) lasts for maybe two seconds.
If i give it a little throttle, rev the engine a little, the rattle comes on quicker and is much shorter...maybe a half a second.
This happens every time I start it...whether It's been shut down for five seconds or twelve hours. Hot or cold.
I'm thinking I still have a slug of air going through there somehow, though I can't imagine how...I decided I could live without clear hoses, so I've replaced all the hoses with Goodyear J30R9 (the high-temp, chemically-resistant, blue-liner fuel injection stuff.) For it to happen so soon after startup, any leak would have to be pretty close to the IP, or maybe in the IP itself (few seconds for the air to hit the injectors.)
Or could it be that the timing ring is sticking a little bit, for a second or two, on startup?
Or...??!! Any and all comments/theories welcome...Thanks....
My original post, "4300 dollar repair bill"
http://www.dieseltowingresource.com/showthread.php?t=6417
I had white smoke on startup...You guys said "air in the system,"
Couldn't find air leak, 6.5 expert diagnosed it as a bad injection pump. Changed out pump, problem not solved. After weeks of wrestling with the problem, it seems that several of my fuel hoses started leaking at once...so...YOU GUYS WERE CORRECT! AIR LEAKS!!! ):h :mad2:
I have (had) clear braided polyurethane hoses (due to my WVO setup) that are only a year old. Because of the braid, the leaks were acting like a check valve...letting air in, but not showing a leak under pressure. Finally the leaks got worse and started to leak fuel out, that's how I diagnosed the problem.
So I had the expert put the old IP back in. He warns me that the timing ring is sticking intermittently...swapped out stepper motors, the timing is still not advancing...sometimes. (intermittent problem.)
But...he is willing to buy back the new pump from me, leave the old pump in, and take it off the bill.
And the truck is running fine with the old pump, EXCEPT:
When I start it, hot or cold, it starts easily, normal little puff of white smoke cold. Runs well for about 5-8 seconds, then suddenly the idle RPM drops for about a second or two, and I get a LOUD diesel rattle. After a second or two, the loud rattle stops, and everything is fine for the rest of the time I'm running it.
If I use no throttle on startup, the loud rattle (and RPM drop) lasts for maybe two seconds.
If i give it a little throttle, rev the engine a little, the rattle comes on quicker and is much shorter...maybe a half a second.
This happens every time I start it...whether It's been shut down for five seconds or twelve hours. Hot or cold.
I'm thinking I still have a slug of air going through there somehow, though I can't imagine how...I decided I could live without clear hoses, so I've replaced all the hoses with Goodyear J30R9 (the high-temp, chemically-resistant, blue-liner fuel injection stuff.) For it to happen so soon after startup, any leak would have to be pretty close to the IP, or maybe in the IP itself (few seconds for the air to hit the injectors.)
Or could it be that the timing ring is sticking a little bit, for a second or two, on startup?
Or...??!! Any and all comments/theories welcome...Thanks....