| Author |
Message |
David & Lorna Schinske (Davidschinske) (64.24.236.114)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, September 02, 2001 - 4:01 pm: | |
8V71N: when idling makes blue smoke from passenger side muffler only.....under load makes LOTS of black smoke (Dad-in-law couldn't hardly see thru smoke when he followed me). Diesel mechanic at coffee shop said to change filters...Does that sound right? Where are the filters? Also not much power...still need to get it home under it's own power.
Dave |
Tom Caffrey (Pvcces) (12.146.32.12)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, September 02, 2001 - 8:32 pm: | |
David, check your air filters. If GM 4106, they're right above the engine and there are four of them. I don't know enough about the other busses to tell you where they are. If they're not clean, clean them. Also, on that engine, if the fuel return line from the engine or the orifice mounted right on the engine at the beginning of the fuel return line happens to have become obstructed, say from a crushed line, that will increase the fuel injected and could lead to black smoke.
This has a good chance of helping you with the black smoke. In a diesel, if there is enough air to the engine, and the fuel spray is fine enough and injected about the right time, combustion will be fairly clean.
The blue smoke is likely caused by other things. It can come from a broken ring or a scored liner passing some lube oil. If you get the black smoke under control and the blue smoke is only seen at idle, it probably will not be anything you will want to do anything about during your trip. Do make sure your engine oil doesn't get down too far. A good Detroit mechanic is probably needed if you want to run down all the ailments of the engine.
These engines start out with very little leakage and very little smoke, and increase both until it is objectionable enough to overhaul the engine. A good mechanic should be able to tell you where you are along that path, and if it seems safe to drive it home.
Hope this helps. Tom Caffrey |
Daris Bouthillier (4.41.181.6)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 03, 2001 - 12:07 pm: | |
Another quick and easy thing to check, is the screen on top of the blower. It's between the blower and the collector for the air cleanser. When I first had my bus services, it was almost completely blocked with oil and dirt. After the mechanic replaced it, the smoke was only there on hard acceleration and it felt like I picked up a littler power. I'm sure you can pick up a screen, and any truck parts place.
Regards,
Daris
64 PD4106 |
Al Moreno (64.12.105.176)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 03, 2001 - 12:29 pm: | |
David check the emergency shut down intake valve. The valve sometimes is set accidently and the valve dose not close all the way. The engine will start, but engine will have the air restricted ta power on,causing black smoke. |
Daris Bouthillier (4.41.181.6)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 03, 2001 - 1:11 pm: | |
If the emergancy shutdown valve is triggered, the bus won't run. |
JayJay (152.163.213.176)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 03, 2001 - 11:44 pm: | |
When I first got my coach the emergency shut down would not stop the engine. Someone had inverted the gaskets, i.e. top one on bottom, and the bottom one on top. This allowed the hinge side of the flapper to hang-up on the edge of the gasket, and not go completely shut. I pulled the blower cover, and installed new gaskets (From Florida Detroit Diesel, in N. Ft. Myers). This is not an Ad for them, but if you have a problem while on the southwest coast of FL. they are great to work with. Good luck,and Cheers...JJ |
Jim Wilke (199.181.167.68)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 04, 2001 - 8:48 am: | |
My 6-71 WILL start & run, but won't go much over idle. It smokes like a freight train but doesn't quite shut down. I'd be looking at dirty air cleaners or screens as mentioned.
Jim-Bob |
JERRY TERROVONA (152.163.197.79)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 24, 2001 - 10:23 am: | |
MY 4106 SMOKES BUT IT IS WHITE AND IF YOUR AT THE BACK THE FUMES WILL BURN YOUR EYES IS IT RUNNING TO LEAN ? CAN THIS BE ADJUSTED? |
Tom Caffrey (Pvcces) (12.146.33.248)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 24, 2001 - 11:14 pm: | |
Jerry, diesels can't run too lean. If the fuel is reduced, they just put out less power; increase the fuel, they put out more power until they run out of air. Then they black smoke.
They are what is called a compression ignition engine; the heat of compression starts the fuel burning. If there isn't enough heat, the fuel doesn't burn anything but your eyes.
If the smoke doesn't go away after the engine is up to temperature, you have too low of compression to be servicable. However, if it has been sitting a long time, it may improve after taking it down the highway. The improvement may not be permanent.
If it doesn't clear up after a little highway time, find and cure the loss of compression.
There are a number of things that can cause this and much of it can be found by an experienced Detroit Diesel mechanic, without tearing it down first.
I hope this saves you some trouble.
Tom Caffrey PD4106-2576 |
|