This subject may have come up in the past but this may be a good reminder for those of you with Yanmar engines in your John Deere CUT's. For some (myself included) the combustion noise or combustion knock (if you will) can be very irritating for the operator, especially when operating the tractor for long periods of time. I personally use a good pair of ear muff type hearing protectors but you can improve combustion noise level other ways too.
Injection timing can effect this noise but in this case unless someone has been working or adjusting the pump timing, I would assume it is set correctly. The combustion knock in some cases can be related to poor quality or low cetane fuel. (not likley but sometimes the case if using fuel that has been setting for a long time)
The minimum cetane rating for diesel fuel in the States is supposed to be 40. In this case the combustion knock can be reduced or minimized by the addition of a cetane rating level raising diesel fuel additive. Cetane rating of diesel fuel pertains to the delay of combustion upon completion of the ignition compression cycle. Lower cetane level fuels delay ignition longer; higher less delay and less noise.
The most you can reasonably expect to raise the cetane level in most fuels is around 6 points but this can make a noticable difference depending on the quality of the fuel it is added to. Mind you, no miracle claims here; just a reasonable improvement in some cases. It is a good idea to use a good fuel additive as it is cheap insurance maintaining the fuel system as a good fuel additive will:
1. improve cetane rating (minimum should be 40 but higher is better)cetane rating is not like octane rating. It effects the delay of ignition of the fuel upon compression the less delay the better.
2. add detergents to aid cleaning the fuel system
3. stabilize the fuel (diesel is far more stabil than gas but cannot be stored for extended periods without deteriorating. A tractor or farm fuel source may sit for long periods.
4. enhance the lubricity of the fuel to ensure lubrication of injectors and pumps.
5. rust and corrosion protection from water or other contaminants that may get into fuel.
6. lowers gel/cloud point or winterizes fuel
7. provides de-ice protection in that it soluablizes water deposits mixed in with fuel with the fuel itself; allowing the water to pass through the system (still not good for it) with as little damage/problems as possible.
Some fuel additives that claim to raise cetane are Power Service (regular formula), John Deere Summer Formula, Howes, and Amalgamated Inc.
You may want to try one of these and see if you notice an improvement. In any case it is still a good maintenance practice to run a good diesel fuel additive all the time.
In time you will come to either love or ignore the sound of a diesel at work.
Injection timing can effect this noise but in this case unless someone has been working or adjusting the pump timing, I would assume it is set correctly. The combustion knock in some cases can be related to poor quality or low cetane fuel. (not likley but sometimes the case if using fuel that has been setting for a long time)
The minimum cetane rating for diesel fuel in the States is supposed to be 40. In this case the combustion knock can be reduced or minimized by the addition of a cetane rating level raising diesel fuel additive. Cetane rating of diesel fuel pertains to the delay of combustion upon completion of the ignition compression cycle. Lower cetane level fuels delay ignition longer; higher less delay and less noise.
The most you can reasonably expect to raise the cetane level in most fuels is around 6 points but this can make a noticable difference depending on the quality of the fuel it is added to. Mind you, no miracle claims here; just a reasonable improvement in some cases. It is a good idea to use a good fuel additive as it is cheap insurance maintaining the fuel system as a good fuel additive will:
1. improve cetane rating (minimum should be 40 but higher is better)cetane rating is not like octane rating. It effects the delay of ignition of the fuel upon compression the less delay the better.
2. add detergents to aid cleaning the fuel system
3. stabilize the fuel (diesel is far more stabil than gas but cannot be stored for extended periods without deteriorating. A tractor or farm fuel source may sit for long periods.
4. enhance the lubricity of the fuel to ensure lubrication of injectors and pumps.
5. rust and corrosion protection from water or other contaminants that may get into fuel.
6. lowers gel/cloud point or winterizes fuel
7. provides de-ice protection in that it soluablizes water deposits mixed in with fuel with the fuel itself; allowing the water to pass through the system (still not good for it) with as little damage/problems as possible.
Some fuel additives that claim to raise cetane are Power Service (regular formula), John Deere Summer Formula, Howes, and Amalgamated Inc.
You may want to try one of these and see if you notice an improvement. In any case it is still a good maintenance practice to run a good diesel fuel additive all the time.
In time you will come to either love or ignore the sound of a diesel at work.
