Bleeding air at injector

[casey1999]

Originally Posted by jslade8581

The banjo bolt on top does not require the line wrench (that's what I was calling the fuel return bolt). You can use a regular wrench - I feel like it was a 12 mm, but I'm not sure. Just be careful of the copper washers.

The line wrench is used to break the injector from the injector fuel line, which comes in at a 90 degree angle at the side of the injector. The line wrench has 5 sides vice a normal wrench's 2 sides, so that you can slip it over the line. There's no packing that I saw in the 2 GM - there was a little metal-shaped nozzle at the end of the fuel injector line, but the line was relatively easy to manipulate.

Would you know if the fuel injector sprays fuel directly into the top of the cylinder? If this is the case, just wondering how the fuel injector makes a good seal as when the diesel fuel explodes, very high combustion pressures result. I was curious how the injector seal is made good to hold this pressure.

[hellosailor]

Thin copper washers are normally crush washers, use once then dispose of it and replace, or it will come back to haunt you. Cheaper by the box or dozen.

PBlaster and Kroil (not sold in stores) are very different from WD40 or Liquid Wrench, they chemically attack the corrosion they are not just lubricants.

But there's also a new product on the market from Loctite, a FREEZE and release spray. It ices down the parts, like dry ice, but comes in a convenient spray can with a special penetrant in it, designed to work with the freezing. If I ever see a can on a shelf, I'm buying it for the arsenal.

[jslade8581]

Not sure if anyone was tracking this still, but the problem wasn't the fuel or the compression. It turned out to be the mixing elbow. It had gotten so corroded on the interior that it wasn't letting the engine breathe.

It ran for 10 minutes then stalled out because of the built up back pressure. When I disconnected the cooling water line from the mixing elbow, I heard it depressurize!

Anyway, I replaced the mixing elbow today, and the engine fired right up.

And to think, the diesel mechanic I hired to take a look at the system was willing to charge me only $2500 for the parts to rebuild the diesel engine. I won't be doing business with him again.

(How'd I figure this one out? When I was at the Miami Boat show, my dad and I stumbled on Carl, a Yanmar mechanic who was about to do a Blue Water Sailing magazine seminar on Diesel Engine maintenance and troubleshooting. We saw him next to the food tent, and with about two minutes to go to his seminar, we engaged him conversation and described the engine symptoms. He looked at us for a minute and said, "Sounds like you need to replace the mixing elbow." And then he excused himself to give his seminar. So Carl, if you're reading this - THANK YOU.)

[jrd22]

Good news! Glad to hear you got it going and didn't get suckered into a rebuild.

[Faster]

Thanks for the follow-up!

[SloopJonB]

Originally Posted by jslade8581

Not sure if anyone was tracking this still, but the problem wasn't the fuel or the compression. It turned out to be the mixing elbow. It had gotten so corroded on the interior that it wasn't letting the engine breathe.

It ran for 10 minutes then stalled out because of the built up back pressure. When I disconnected the cooling water line from the mixing elbow, I heard it depressurize!

Anyway, I replaced the mixing elbow today, and the engine fired right up.

And to think, the diesel mechanic I hired to take a look at the system was willing to charge me only $2500 for the parts to rebuild the diesel engine. I won't be doing business with him again.

(How'd I figure this one out? When I was at the Miami Boat show, my dad and I stumbled on Carl, a Yanmar mechanic who was about to do a Blue Water Sailing magazine seminar on Diesel Engine maintenance and troubleshooting. We saw him next to the food tent, and with about two minutes to go to his seminar, we engaged him conversation and described the engine symptoms. He looked at us for a minute and said, "Sounds like you need to replace the mixing elbow." And then he excused himself to give his seminar. So Carl, if you're reading this - THANK YOU.)

I had the same situation with my Perkins except it would only fire two or three times before stopping - the water injection pipe into the elbow was plugged almost solid with salt crystals. Once they were cleaned out it ran just fine.

[97fxdwg]

Originally Posted by jslade8581

Not sure if anyone was tracking this still, but the problem wasn't the fuel or the compression. It turned out to be the mixing elbow. It had gotten so corroded on the interior that it wasn't letting the engine breathe.

It ran for 10 minutes then stalled out because of the built up back pressure. When I disconnected the cooling water line from the mixing elbow, I heard it depressurize!

Anyway, I replaced the mixing elbow today, and the engine fired right up.

And to think, the diesel mechanic I hired to take a look at the system was willing to charge me only $2500 for the parts to rebuild the diesel engine. I won't be doing business with him again.

(How'd I figure this one out? When I was at the Miami Boat show, my dad and I stumbled on Carl, a Yanmar mechanic who was about to do a Blue Water Sailing magazine seminar on Diesel Engine maintenance and troubleshooting. We saw him next to the food tent, and with about two minutes to go to his seminar, we engaged him conversation and described the engine symptoms. He looked at us for a minute and said, "Sounds like you need to replace the mixing elbow." And then he excused himself to give his seminar. So Carl, if you're reading this - THANK YOU.)

Thanks for the update, and congrats on your success. I'll put that one in my memory bank for "In Case Of." (Assuming I have more room for stuff up there.)