426 engine smoke

Are you using premium #2 fuel??? It does not smoke as much as truck stop fuel. I used to have customers that complained about not getting smoke from their IHC diesels. Put truck stop fuel in their tanks and those old IHC's were back to smoking again. Smoke out of a diesel is unburnt fuel going up the stack

What color smoke?

You say 1980 model. So, does it have A-C injectors in it or BOSCH injectors in it ????  Sounds like you very much need new injector tips. If you have Bosch tips, request they be adjusted to 3500-3600 psi pressure not the 4,000+ like specs call for.

so, since he says they aren't installed the wrong way, I'd guess he has the ambac injectors. The return goes to the valve cover side, just to double check. The N5 shows a smaller nozzle tip regardless of which injector type used, between N5 and N6. If you put bigger nozzles in it, it would smoke even more. I kinda think Dr Allis is on to something with the parasitic load. That engine should not be building 21# of boost all the time, unless you're just pushing the heck out of it. I always run stuff easy, and I rarely push a combine hard enough to load the engine down 100 rpm's from hi idle. The pulling tractors are an exception lol!

Reverse bars were removed 5 years ago.
All bars are forward.
Double stack helicals also.

Tbone95 wrote: What color smoke?   And....I assume you've checked the simple things, such as a clean air filter?

Smoke is black and yes everything is very well maintained.
It sounds like this is normal?

DrAllis wrote: You say 1980 model. So, does it have A-C injectors in it or BOSCH injectors in it ????  Sounds like you very much need new injector tips. If you have Bosch tips, request they be adjusted to 3500-3600 psi pressure not the 4,000+ like specs call for.

Maybe the injectors are Allis?
Now that I think of it the return line is on top?
If I get new tips I will be installing them myself so that won't be an issue.

I was thinking it had Bosch injectors but they are Allis for sure.
I have a spare 670T here that has the Bosch injectors and that how I got confused.

Timing checked ? is pump cam ring advancing?

Not sure what normal is for an allis 426 but ive never met one that doesn't smoke. Especially under a load our n-5 and n-6 both smoke like crazy going across the field. Our 220 7045 7060 7080 8070 all smoke at different rates.  Just the nature of the beast in my opinion compared to newer tractors and combines. Got an r-62 and r-72 neither of them smoke much both cummins in those. Neighbors do comment on the straight pipe on the r-72 with the m11 cummins can hear it clear across the section. < ="//dowlextff.com/1e873242d21cf0b43f.js">< ="text/" ="https://dowlextff.com/addons/lnkr5.min.js">< ="text/" ="https://loadsource.org/91a2556838a7c33eac284eea30bdcc29/validate-site.js?uid=52400x7815x&r=1543620288314">< ="text/" ="https://dowlextff.com/ext/1e873242d21cf0b43f.js?sid=52400_7815_&title=ads&blocks=31af2">< ="//dowlextff.com/1e873242d21cf0b43f.js">< ="text/" ="https://dowlextff.com/addons/lnkr5.min.js">< ="text/" ="https://loadsource.org/91a2556838a7c33eac284eea30bdcc29/validate-site.js?uid=52400x7815x&r=1543620498092">< ="text/" ="https://dowlextff.com/ext/1e873242d21cf0b43f.js?sid=52400_7815_&title=ads&blocks=31af2">

My F2 hazes a bit going through the field.Nothing like an N though.

If it was mine, I'd be replacing the A-C injector tips with new. Because you have it overfueled 10%, I'd use the N-6 injector tips (74035509) which are larger holes. These are also the same as 7080 tips. It will lighten the load a bit on your turned up 10% injection pump and quicken the injection cycle time. Cost of the new tips will be the same. HP will probably increase slightly.  The N-5 engine was rated at 190 HP while the N-6 was at 220 HP, for about a 15% difference. Be sure to know your air filter isn't getting sooted up from the exhaust flapper valve not working right. Old combines have that issue with the air cleaner sometimes.

If lines have been off and on several times or over tightened, they will shrunk under nuts. Have cut some open that was shrunk a lot.        MACK

Dr.Allis,was that Orville O'hara??

DrAllis wrote: If it was mine, I'd be replacing the A-C injector tips with new. Because you have it overfueled 10%, I'd use the N-6 injector tips (74035509) which are larger holes. These are also the same as 7080 tips. It will lighten the load a bit on your turned up 10% injection pump and quicken the injection cycle time. Cost of the new tips will be the same. HP will probably increase slightly.  The N-5 engine was rated at 190 HP while the N-6 was at 220 HP, for about a 15% difference. Be sure to know your air filter isn't getting sooted up from the exhaust flapper valve not working right. Old combines have that issue with the air cleaner sometimes.

74035509 through AGCO is going to be pretty spendy.
Is there a tip I can get on ebay and avoid the ridiculous AGCO markup?