Removing an Injector and chambers

[NYSail]

Hello all,I am currently removing an injector on my Yanmar 3HM35F to replace the seats and chambers under the injector as they are worn and are leaking. I got the injector out, however need advice on getting the 2 chambers and washers out. I have heard of one technique by turning the engine over and letting the compression kick them out, however need first hand step by step advise.Thanks again in advanceGreg

 

[Fred Ficarra]

That's what I was going to suggest.

If you replace the injectors but bolt them in very loosly, they will catch the chambers so they don't become ballistic.

 

[NYSail]

Damage

will the force of the chambers damage the bottom of the injector? And what happens if when this is done, flakes of old crumbling washers fall into the engine?Thanks for you adviseGreg

 

[Benny]

Your concerns are well founded;

as you could damage the injector and trapped debri could get into the engine. If you already have a replacement heat shield and pre-combustion chamber and would not need to re-use the parts you can try blowing them out. Just lay a piece of thin cloth loosely over the injector hole so it can catch the flying parts. Try cranking the engine with the stop cable out. If that does not do it, place the injector inside a smal can to collect fuel and start the engine briefly on just 2 cylinders. The compression should blow the parts out together with any debri. Step out of the way and use safety glasses. The manufacturer recommends removal of the cylinder head to disloge stuck chambers but I think that is, if you want to save and reuse the parts. Don't forget there is a copper gasket under the pre-combustion chamber as it may not get blown out.

 

[Fred Ficarra]

Benny

Those parts live together under incredibly severe conditions. To dislodge the combustion chamber, keeping a loose injector in place (no more than 1/8" loose) is the safest way to prevent damage or injury. Debris is always a risk with this kind of work.And Benny, could you explain how and why an injector connected to the high pressure steel line (that can't move) is to be put into a can.