Fuel Injector service

[Reefgeorge]

I have one minor fuel leak at one injector that is giving me fits trying to fix. I still can't tell if its the fuel feed union or the side mounted compound return attachments. Does anyone know the proper torque value for a 17mm metal fuel line union nut so I can check my tightening force? Related items suggest 15 - 21 ft lbs. Next week I will take a closer look to get it fixed completely but I have to move the boat today. I have already loosened, turned washers and retightened and that helped but did not completely solve the problem.

Thanks,

George

 

[Reefgeorge]

Does anyone know custom metal fuel line fabrication or repair capability. Looks like a may have a damaged line at the injector and MAN only sells the entire spider at the "entire"cost.

Thanks,

George

 

[Avenger]

Most fuel injection shops can re-flare the end for you.

 

[Reefgeorge]

I talked to the injector shop that rebuilt my injectors and he said he knows of no solution. These are steel lines with bulbs pressed onto the end of the steel pipe and are a specific metric ID which is apparently critical to the delivery rate. Does anyone know someone on the east coast of Florida that might be able to help?

Thanks,

George

 

[Fish Tales]

Jeff at Triangle Diesel in Lake County has built me lines in the past for some obsolete units.

Try him, 877-735-4999.

Hope this helps,

Tim

 

[Avenger]

So a separate piece pressed on the end like a ferrule? Or is the end of the line swaged into a shape?

 

[Reefgeorge]

Looks like a separate piece pressed on the end. I'll take a closer look when I get the boat out of the yard. I also now have the torque specs for the 17mm Union nut on the high pressure lines - 10nm, 60 degrees, then 30 degrees. So three passes.

George

 

[krush]

It's 2017....why don't you stop trying to describe it and take a picture? Prince is dead...we don't need to party like 1999

 

[Reefgeorge]

It's 2017....why don't you stop trying to describe it and take a picture? Prince is dead...we don't need to party like 1999

I will krush. The boat limped into the yard yesterday leaking fitting and all to make my immovable yard schedule yesterday. When I go to pick it up I will take this issue back up and will post some pictures.

Thanks,

George

 

[Reefgeorge]

I finally got a hold of the manual that contains the torque values for my engine. The value for the high pressure fuel line union nuts reads as follows:

Initial torque ...................................... 10NM (8 ft lbs)
rotation angle for first installation .......... 60 degrees
rotation angle for following installation .... 30 degrees

I was told this meant a 3 pass process each time. I take this to mean a 2 pass process, either 10NM plus 60 degrees or 10NM plus 30 degrees depending on if the fuel line is a new install. This would make sense based on the old rule of thumb of contact plus one nut flat which is 60 degrees on a hex.

How do you guys see this?

Thanks,

George

 

[Reefgeorge]

Here's what my injector fuel line connectors look like.

George

 

[Reefgeorge]

Inspection of the leaking fitting did not show any cracking or burrs. Since I finally got a hold of the MAN spec for torque at the hex nut for the high pressure supply connection to the injector I reseated that one and was surprised at how much torque was required to get the fitting rotated 30 degrees after seating. Most of my experience is in copper connections such as for refrigeration and not steel to steel such as here so hopefully I just did not use enough persuasion on these connections. Hopefully we can do another sea trial this weekend and try to button this up. If not I may be forced to buy the line set(s).

George

 

[Reefgeorge]

I am almost leak free after reseating these fittings and using the force appropriate for steel flares. I just have to access two more connections after the engines cool down and I can remove the schtuff thats preventing access.

I also found that if the pipe has a bias you have to straighten it out and wiggle it as you seat it with the flare nut to get good, even contact. Then crank away using light contact plus 30 degrees.

George

 

[Reefgeorge]

Here on the East coast Diesel Injection of Martin County are the best. Ask for John, (772) 283-8999

I want to thank you for your recommendation. John was very responsive, his pricing was fair and the rebuilt injectors work great from idle to full load.

George