B7800 200hrs like new puff of blue smoke ,no power

[ohiojim]

tractor is in excellant condition, was mowing grass felt under powered watched the exhaust and I,d see a small puff of blue smoke , cleaned fuel filter put about three oz of sea foam in tank , mowed grass a bit, but still not right ,RPM,s will only tach 2k. I,m handy and can check things out, I though about pulling the injectors, but don,t no what I,d be looking for. any idea,s help appr. jim

 

[Toolguy]

Check the air filter. It will not make power if the air intake is plugged. The blue smoke could be oil being sucked past the rings on the intake stroke because of an intake restriction.
You could have a rodent making a home in the air filter. With only 200 hrs on the clock it must set idle much of the time. That is when the critters will move in.

 

[ohiojim]

OK and it does sit in a pole bldg most its life.going down now and take it apart. thanks. its a place to start.

 

[ohiojim]

I just took it offf apart and its clean just a little dust,BUT , its black smoke not blue , I idled the tractor then rev,d up each time I get a puff of black smoke. is there away to check injectors?

 

[Toolguy]

There are four injectors. The chance of all of them being bad at the same is very small. It sounds like something that is common to all of them. How old is the fuel? Diesel fuel does go bad at some point. If it has been a few years since you put new fuel in the tank it could be a problem. Or, you could have unknowingly bought bad fuel recently. I would drain the fuel and put some new fuel in from a different source and see if it runs better. That is a simple way to eliminate a potential problem. If that does not fix it then, depending on your mechanical expertise, you could check the pressure at the injectors or a trip to a dealer may be in order. Good luck.

 

[rswyan]

I just took it offf apart and its clean just a little dust, BUT, its black smoke not blue , I idled the tractor then rev,d up each time I get a puff of black smoke. is there away to check injectors?

Normal for a diesel ...

 

[ohiojim]

ok I,ll change it out, 2gal last years 4gal new mixed but I,ll chage it.

 

[kuboman]

You say you cleaned the fuel filter. Forget that, replace it. Cleaning does not work plus it is a good way to put a hole in the filter. Just replace with a new one.

 

[ohiojim]

changed filter and CLEANED TANK. new fuel .its running fine thanks jim

 

[sandyc]

Love it when a plan comes together! Good lesson for all of us......