| Author |
Message |
CaptBob (129.44.212.84)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 11:04 am: | |
I have a 1986 6V92TA, recently I have seen heavy puffs of smoke (white/gray) from the exhaust intermitently, when the smoke appears there is a slight engine sound change, almost like an engine miss. Going to set up appointment to have injectors checked and timed. Does this sound like I'm in the right ballpark?
Thanks Bob |
TWO DOGS (63.156.216.14)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 11:17 am: | |
I would say you are in the correct area |
dave (209.137.231.95)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 1:32 pm: | |
injector problems will give you black or dark smoke if your overfueled. white or grayish smoke almost always is water [ engine coolant] vaporized. and yes you will hear the engine sound a little different when it tries to burn that coolant. check pressure in radiator when up to operating temp. should be around 14#psi. if more substantially, could be leaking head gasket |
BrianMCI96A3 (65.173.87.31)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 5:24 pm: | |
Just what driving conditions are you experiencing when you observe the smoke?
I am more inclined to think along the same lines as Dave, but more info... like how often does it occur, for how long etc, is it only after warm-up, only when driving? etc. etc. would be helpful to diagnose the origin of the problem
Brian |
James Maxwell (Jmaxwell) (66.81.49.251)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 6:12 pm: | |
I'm inclined to think along the line of Two Dogs when he says grey and if it is not steady. I don't know where the 14# pressure comes from (which bus or engine) because I have a 6v92 and a 8v92 and both are 4# on relief valves, not caps, from the factory. I'm not sure that there is a set figure for all applications.
Let it set a couple of days then crack the oil pan drain plug very carefully. Do not remove it, just back it out enough for fluid to seep around the threads. If you are loosing coolant into the crankcase, it is the first thing out of the drain plug. |
don (Bottomacher) (66.216.217.11)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 6:24 pm: | |
I just bought a MC9 which is blowing a bunch of heavy black smoke on acceleration. The seller drove the bus at about 8000 feet elevation and claims to have set the injectors to suit the altitude. It ran very well otherwise on the 2000 mile trip home, and I expect that it just needs to be reset for sea level. Does anyone know a good DD mechanic in the Atlanta area who can tune a 6V92? Thanks
Don |
TWO DOGS (4.226.105.157)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 6:57 pm: | |
good two-cycle mechanics are hard to find...look in the yellow pages & call around the different truck repair places..NOT dealerships...tell them you need your injectors set on a 8v71...even the little small towns around you... |
Dallas Farnworth (Dallas) (172.146.88.7)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 7:26 pm: | |
Don and anybody else that is interested:
You may want to joint the 2stroke diesel group at Yahoo to find out more than you ever wanted to know about our wonderful engines.
The address is:
http://autos.groups.yahoo.com/group/DetroitDiesel/ |
Lorin David McCleary (Wacoastmci) (148.78.247.10)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 7:38 pm: | |
White diesel smoke puffs can also indicate some air in the fuel system. Found this out after having fuel filters changed on our 102D. Had puffs of white smoke and intermittent rough running for short while very much like Bob has described. Did you change fuel filters recently? |
CaptBob (141.149.236.150)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2004 - 9:59 pm: | |
Hmmmm, fuel filters were changed just before a 600 mile trip. There really wasn't any noticable smoking problems while cruising at 65mph for the 600 miles. I've noticed the problem of increased smoke and the puffing (which only occurs for a slipt second) while running on high idle. I also do have more smoke than normal in general. I though it might be an injector problem because I have read many places that white/gray smoke can mean unburnt fuel, while black is normally improper burning of fuel.
I was just thinking, I have a Cummins BG Series diesel in a piece of equipment and never have these problems.
But then if I didn't have a Detroit, I wold probably be bored.
Bob |
Geoff (Geoff) (66.238.120.31)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 01, 2004 - 8:26 am: | |
Tighten your fuel filters and cancel the shop appointment. |
don (Bottomacher) (66.216.217.11)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 01, 2004 - 4:57 pm: | |
Thanks, Dallas. I joined this morning. |