Hi, I've got a question about my Canadian 85 BJ70 3B (no turbo). From another post black smoke should not be present and is caused by:
· Incorrect fuel injection timing
· Dirty or worn fuel injectors
· Over fuelling
· Faulty turbocharger, or turbo lag
· Faulty or dirty exhaust gas recycling (EGR) system
· Incorrect valve clearance
· Incorrect fuel to air ratio
· Dirty or restricted air cleaner systems
· Over loading the engine
· Poor fuel quality
· Cool operating temperatures
· High altitude operation
· Excessive carbon build-up in combustion and exhaust spaces
So far, I have done the following to try and correct the issue:
1. I've had the timing adjusted
2. I've replaced the injectors (they were super old anyway)
3. I've adjusted the fuel adjustment screw as far forward as it will go (and, oddly, have not lost any acceleration)
4. I have a clean air filter.
5. I don't overload the engine.
6. Fuel quality is fine.
7. Operating temperatures are generally NOT cool
8. I live in Calgary, AB - not especially high
9. I've run a Diesel Purge through it.
I'm thinking that I am kind of left with valve clearance as an issue.
A) Can someone explain to me why valve clearance would change in an engine? B) Is this something that can be seen to easily? I've been doing a lot of maintenance on this vehicle since I inherited it and if it's relatively easy to do, I will do it, but if you guys recommend taking it to a professional I will do that.
C) Is this a yearly maintenance type of thing?
D) Aside from the bullets I found above regarding black smoke causes, can you think of anything else that would cause black smoke? What about a dirty sedimenter - I honestly doubt my father-in-law ever saw to it in the hundreds of thousands of kms he's put on it - something I am going to see to tomorrow.
Sorry for the long post and thanks in advance for your help and advice!
· Incorrect fuel injection timing
· Dirty or worn fuel injectors
· Over fuelling
· Faulty turbocharger, or turbo lag
· Faulty or dirty exhaust gas recycling (EGR) system
· Incorrect valve clearance
· Incorrect fuel to air ratio
· Dirty or restricted air cleaner systems
· Over loading the engine
· Poor fuel quality
· Cool operating temperatures
· High altitude operation
· Excessive carbon build-up in combustion and exhaust spaces
So far, I have done the following to try and correct the issue:
1. I've had the timing adjusted
2. I've replaced the injectors (they were super old anyway)
3. I've adjusted the fuel adjustment screw as far forward as it will go (and, oddly, have not lost any acceleration)
4. I have a clean air filter.
5. I don't overload the engine.
6. Fuel quality is fine.
7. Operating temperatures are generally NOT cool
8. I live in Calgary, AB - not especially high
9. I've run a Diesel Purge through it.
I'm thinking that I am kind of left with valve clearance as an issue.
A) Can someone explain to me why valve clearance would change in an engine? B) Is this something that can be seen to easily? I've been doing a lot of maintenance on this vehicle since I inherited it and if it's relatively easy to do, I will do it, but if you guys recommend taking it to a professional I will do that.
C) Is this a yearly maintenance type of thing?
D) Aside from the bullets I found above regarding black smoke causes, can you think of anything else that would cause black smoke? What about a dirty sedimenter - I honestly doubt my father-in-law ever saw to it in the hundreds of thousands of kms he's put on it - something I am going to see to tomorrow.
Sorry for the long post and thanks in advance for your help and advice!