Smoking Yanmar 2GM20F

[bignick]

I wonder if it’s a problem with the governor or something?
Could explain why the fuelling is off when accelerating or decelerating, but is ok when at constant load.

 

[olly_love]

That's a good shout,

looking at the files for it, I`m not sure what could go wrong but something!

But normally governor issues mean it hunts for revs when under load?

ours has a very smooth delivery

 

[olly_love]

Update,

There is some scoring on the fuel pump so this maybe letting more fuel in that it should

Downdate, parts from Yanmar are on backorder for all the pipework etc.

 

[bignick]

Found this, which may come in useful to someone reading this thread at some point…

2gm20f High Pressure Fuel Pump Re-Assembly

There’s a copy of the Yanmar Fuel Pump assembly instructions embedded in it.

 

[olly_love]

The Fuel pump guys have said that the pump has failed its test and letting too much fuel through ( scored internals)

So looks like we have found the route of the issues.

However a fuel pump is £1500 and repair £850.

Why is this more for a 2cylinder than is for a V8 automotive!

 

[westernman]

The Fuel pump guys have said that the pump has failed its test and letting too much fuel through ( scored internals)

So looks like we have found the route of the issues.

However a fuel pump is £1500 and repair £850.

Why is this more for a 2cylinder than is for a V8 automotive!

BOAT (Bring Out Another Thousand).

Of course if it was for a small private plane, it would be another 5x the cost for a simple 4 cylinder engine designed 75 years ago.

 

[bignick]

Ouch!