Injector heat sheild gasket

[Doug]

On our yanmar 2gm20f, we are replacing the old injectors with new ones. We ordered the new injectors and "everything we needed to install" from our local yanmar dealer. We got 2 o-rings and 2 copper washers. We needed 4 copper washers (2 for each injector) and also the Heat sheild gaskets (round copper with hole in center) that we did not receive. They told me they dont usually send those with new injectors. They are gaskets!! I'm sure the crushed old ones need to be replaced. Anybody know the item # for those? Also, what type of gasket adhesive/sealer do we use to "glue" them to the head sheild? It looked like some silvery stuff was used on original ones.ThanksDoug

 

[Gordon Torresen]

Heat shields

Yes, you should replace the heat shields - and all four copper washers. There is no compound required. The silver you see on the old shields in some high temperature compound that is impregnated into the shields. Make sure to remove ALL of the old shields which is often a drawn out scraping proceedure.

 

[James Marohn]

Silvery stuff...

Hmmm... When I purchased spare parts for my 3GM30 (which is basically the same engine except with a 3rd cylinder), they sold me a copper washer AND a silver soft metal washer. The soft silver washer, they told me, fits snuggly into the upper peice of the precombustion chamber. Then the copper washer goes in before the actual injector.So to recap, this is what I've been told that goes into the bore, in the order of deepest to the injector:1) Copper gasket2) Lower precombustion chamber3) Copper gasket4) Upper precombustion chamber5) Silvery washer6) Copper washer7) InjectorThat silvery disk is a real pain to scrape out of the chamber piece. But it does need to be replaced, doesn't it?If not, this might be the answer to my problems (outlined in my previous posts).James Marohn

 

[Gordon Torresen]

Heat shield

The old heat shield is a pain to remove, but it must be done - completely. The new heat shield is then pushed into the recess where the old one came from before reassembly. You don't just drop it in the hole as you can with the copper washers. When removing ALL the old heat shield, don't be fooled by the metal innards of the shield. The silvery stuff is on both sides of a corrugated steel washer that is sometimes confused with the bottom of the recess. Keep digging.