Yanmar black smoke


3

37pc

New member
Hello. Maybe I just never looked back but is it normal to have black smoke as you accelerate for a few seconds? Thanks!
 
Pretty normal when you first start out especially if the oil is not up to normal operating temp it usually takes about 20minutes under a load
 
Thanks! It seems to happen even when the motors are warm. I have a lot of no wake areas by me so I could be almost idling for 30 minutes to 1 hour. If I go from 1500 to 2200 i get a puff of black smoke. Thanks
 
A small amount of Black (fuel smoke) is common on mechanical diesels. What you are seeing is the less than completely burned fuel coming out the exhaust. This is caused by delivering more fuel to to the engine than the turbo can provide air for (Turbo lag). Once the turbo spools up the exhaust should be clear. Yanmar recommends a "Turbo Wash" process that will reduce this by eliminating soot on the turbine. Depending on your accumulated hours it might be a consideration.
 
Thanks so much everyone. Ps anyone know if it is possible to snake cable or wired through an arch on a 40 pc?
 
It should not be a problem. I did it on my 40 with a hard top to install my radar. Also did it on my 98 34 Pc with an arch.
 
Regarding the black smoke, I get it too if I accelerate onto plain quickly, one big puff between 1500 and 2200 rpms.
If I slowly accelerate up to speed, there is hardly any noticeable black smoke.
 
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