Mysterious washer, Yanmar 2GM20F

[matts997]

I had a remanufactured Yanmar 2GM installed last winter. Engine now has ~ 20 hrs on it and is running quite well. But after the last time out, I discovered what I think is a copper (or brass?) washer lying directly beneath the engine. It's ~ 1” in diameter (image attached). I don't see any obvious place where it came from. Does anyone recognize this, know what it's function is?
Thanks,
Matt

 

[kappykaplan]

Old crush washer from an injector?

 

[Weasel]

Yup, old crush washer for an injector. When an injector is pulled and replaced there needs to be a new”crush” washer installed. If not installed the fuel would be squirting out.

 

[heritage]

Yanmar also used copper crush washers on several of the banjo fittings on the fuel lines.

 

[NYSail]

Left over part. If it fell off from somewhere you would see fuel shooting all over.

good luck

 

[MikeHoncho]

And a bolt of some sort

 

[matts997]

Nope, no fuel shooting anywhere to my knowledge.

It is indeed an injector crush washer, which was replaced when the mechanics tested the compression of the reman engine. Not sure why it showed up now, 20 engine hours and 6 months after it was installed. After going through what I went through with my old engine (long, long story), I tend to be a little hypersensitive to any apparent anomaly in the new one! PTSD maybe??

Anyhow, thanks much for all the replies.

matt

 

[Ken13559]

Throw a bolt or two into the engine bay and drives the mechanic crazy