smokin black

[stevew]

My 2004 326 18hp yanmar with 150 hours at 2500 rpm has blk exhaust is this from bad fuel or should I have the fuel injector inspected? Also tips on changing cooling system fluid?

 

[CharlieCobra]

Nope, it needs run at WOT to burn the coke out.

We just did this for my Perkins 4-108 50 HP.

 

[stevew]

questions

Please explain. I teach school and dont get out in the real world.

 

[Don S/V ILLusion]

could be

is a sign of unburned fuel in the exhaust but could also be any of a number of things includingbad fuelclogged injectors (unlikely)clogged exhaust elbowoil leak (also unlikely)glazed cylinder wallsbad cylinder ring(s)crud built up on prop

 

[Mike]

Wide Open Throttle

Steve, I hope you don't teach english!

 

[stevew]

no art

It is my adult therapy job. I hang out with kids and fun staff members make a mess and go home to my three kid, dog and MD wife.

 

[NYSail]

I had

this happen a few weeks ago....First make sure the bottom and prop are clean as growth will cause a strain on the engine, thus causing too much unburned fuel...this time of the year around here (LI, NY), the growth can be pretty bad. It amazed me that what I thought was hardly any growth really put a strain on the engine and cause black soot.Run her hard for long periods......running at low rpm's builds up soot and garbage as is no good for the health of the motor.After I did these items, no problems at all....Run her hard, make her hot...SHE LOVES IT!! (that sounded bad)Then check the injectors, bad fuel etc.......Good Luck and let us knowGreg

 

[gr8_2_av8]

Air Filter?

Check your air filter, not enough air could cause rich running engine.