Yanmar 3JH4E - Running on Gas

[nixxon]

Originally Posted by Mike Banks

Your mix was 60% diesel--so I think you will probably be fine.

The OP wrote that he put "...24 gallons of gas in a 33 gallon tank..."

Maybe the fuel ratio was 24 gallons of gas and 9 gallons of Diesel (total tank capacity: 33 gallons)

Then the Diesel content was probably 9/33 or ~27 % Diesel (73 % gas)

[a64pilot]

Originally Posted by Ecos

Ha! Finally we find a good use for a one time oil sample. Low psi from bearing wear is going to be giving really high readings of bearing material.

It may, or may not. Oil sample is good for microscopic metal.
But cutting open the oil filter will tell you if a bearing has worn excessively in a short period, you can’t miss the metal then.

[a64pilot]

Originally Posted by Midnight Son

A little reading:

https://oards.com/gasoline-fuel-in-d...gine-symptoms/
https://www.thoughtco.com/accidental...gasoline-85225


Have a great time on the water

Just because someone prints it on the internet doesn’t mean it’s true.
How can an engine detonate when there is no fuel present.
One I remember very well was a whole article written by an apparently well respected source claiming that high TBN oil will glaze cylinder walls, and then went on to “prove” it caused they glazed cylinder walls, and it therefore must have been the oil, couldn’t have been because they operated a low time engine at low load over an extended period.

Detonation is when a whole fuel charge is present and it instantaneously combusts. Why it’s harmful is that a normal burn is set off by the spark plug and the flame front proceeds across the charge and is gradual, detonation is instaneous.
Diesels can detonate, especially when cold, it’s when the fuel is injected, but ignition is delayed until there is enough compression heat to set it off.

However a Diesel up to operating temp and up to operating RPM and load, the fuel engines to burn the instant it becomes present, because there is enough heat in the engine to start the burn, at that point they can’t detonate.
So Diesels can tolerate light detonation, and in fact they do detonate under light loads, but they won’t detonate under a higher load, and that’s when detonation is most damaging.

Ether, or starting fluid can cause detonation in a Diesel, that’s how it can damage one, the reason it can cause damage is because it’s not injected at the right time, it’s sucked into the engine on the intake stroke, gasoline if it wasn’t injected at the right moment could cause detonation.

Cetane is the measurement on how easy it is to cause Diesel fuel to combust, the easier it is, the higher the Cetane, easy to initiate combustion Diesel fuel is good, but it of course is less resistant to detonation.

[Midnight Son]

Originally Posted by a64pilot

Just because someone prints it on the internet doesn’t mean it’s true.
How can an engine detonate when there is no fuel present.
One I remember very well was a whole article written by an apparently well respected source claiming that high TBN oil will glaze cylinder walls, and then went on to “prove” it caused they glazed cylinder walls, and it therefore must have been the oil, couldn’t have been because they operated a low time engine at low load over an extended period.

Detonation is when a whole fuel charge is present and it instantaneously combusts. Why it’s harmful is that a normal burn is set off by the spark plug and the flame front proceeds across the charge and is gradual, detonation is instaneous.
Diesels can detonate, especially when cold, it’s when the fuel is injected, but ignition is delayed until there is enough compression heat to set it off.

However a Diesel up to operating temp and up to operating RPM and load, the fuel engines to burn the instant it becomes present, because there is enough heat in the engine to start the burn, at that point they can’t detonate.
So Diesels can tolerate light detonation, and in fact they do detonate under light loads, but they won’t detonate under a higher load, and that’s when detonation is most damaging.

Ether, or starting fluid can cause detonation in a Diesel, that’s how it can damage one, the reason it can cause damage is because it’s not injected at the right time, it’s sucked into the engine on the intake stroke, gasoline if it wasn’t injected at the right moment could cause detonation.

Cetane is the measurement on how easy it is to cause Diesel fuel to combust, the easier it is, the higher the Cetane, easy to initiate combustion Diesel fuel is good, but it of course is less resistant to detonation.

1) Diesel fuel burns rapidly, as injected, to develop maximum power (Cetane in the fuel).
2) Gasoline burns slower (Octane), but flame propagation is more sudden when it starts (detonation), due to exceeginly more heat and pressure of a diesel engine.


or:


https://mechanicbase.com/cars/gasoli...diesel-engine/
https://www.topdriver.com/education-...-a-gas-engine/
https://jalopnik.com/i-put-diesel-in...now-1819452190




I can put more and more links up. How many more do you need?



Happy reading, have a great time sailing, wish I was out there sailing as well.