I have a set of 370 marine injectors that I had put in my truck, When I was putting them in I got brand new copper washers from the dealership at like 6 bucks each. If I remember correct, there were some sort of rings at the top of the injectors but when removing the stock injectors all of those things broke. How necessary are they? and what are they? I only asked because today while driving around I got a wiff of diesel after gettin outa my truck and there was some leaking from every injector.

 

Do you mean the wire rings around the body of the injector? If so thats what holds the injector in.

 

http://www.usdieselparts.com/moreinf...duct_ID/57268/

That is one kit that I found, I am not 100% sure about the wire rings are what your talking about...on the bolt/screw that holds in injector there was something that if i remember correct kinda looked like a lock washer. Also, when looking at the install kit, I don't remember ever putting on the rubber o-ring...It doesn't leak horribly, but just enough to smell and see bubbling from the area that is on top of the bolt/screw...really hard to explain

 

Heck, Idont even know what those black tubes at the top are. I just put the new coppers on the bottoms, dropped in the injectors and torqued the retaining nuts down. You might be leaking at the return line coppers. On those I just take them down to tight and back them off and retighten them.

The wires I was talking about are the ones that the retainer nuts push down on to keep the injectors in place. Maybe 370s are different???

 

I am not sure if they are. I do remember that when we pulled out the stock injectors we had to get a crowbar to pretty much pry them out because they were in there so tight. With these ones, once I get the retaining nut off i can just pull em right out...is that bad? or normal?

 

Mine came out pretty easy. Probably just had corrosion and crap in there from many miles of use.

 

There are (were) flat rubber o-rings that sit into a lip on the retaining nut. They help to keep junk from working past the injectors. They aren't essential but may make it harder to get them out down the line. Sounds like they had served their purpose when you took the first set out.

As for the leaks - did you clean out where the injector seats into the head? Sometime junk can get knocked down in their when you pry the old ones out then not seat even with the copper washers. Also proper torque. The 10mm bolts on the fuel return can also leak if not tight. I've heard that if the copper "horseshoe" washers leak you can heat them up with a torch, let them cool and then install them. This softens the copper and they seat better. Other wise, some will leak for a little while and then stop. Other times you may have to go back and try again.

Paul

 

Yea those are the things that I was talking about. But are those the rubber O-rings that are pictured in the link above? or are those meant to go back around the inlet on the injector?

 

On the link you provided, the top items are the dust shields. I've never figured out how to use them and they are not on stock vehicles. The rubber rings ('square cut O-rings") slip over the injectors after the holddown nuts are on and fit into a small recess between the top of the holddown nut and injector. It's nice to put them in to keep things clean but they do rot out with time. Can you tell where the leak is coming from?

 

Kinda...and I emphasize kinda. All injectors but #1 are leaking and it seems that they are leaking from the area that those rubber o rings you say would go. I just cleaned it all off and I'm gonna let it run and look from there

 

It can be hard to tell sometimes. If coming from the fuel return try and snug them up a little but be careful. This may make it look like it is coming from the holddown nut. The square cut O-rings won't keep it from leaking from the bottom up, but will keep crud out of the injector seat. You may have a problem with the copper washers on the injector tips not seating if you didn't clean up the bottom of the hole in the head for the injector. There is a special injector hole cleaning brush but I have used Q-tips and a mirror to reach #5 & 6. Hopefully the dribble will clear up and you don't have to reinstall.

 

Well after I cleaned it all off and let it idle and drove it alil I have come to the conclusion that I have 1 leaky injector and a leak coming from my valve cover gaskets that made it seem like all of my injectors are leaking because of all the build up around the injectors.

 

Did you also put on new rubber o-rings on the injector body? When replacing the injectors, the brass base washing and the larger rubber o-rings around the injector body should be replaced. Thats what makes the injector difficult to actually pull out of the head.

EDIT: Egnore me. I just realized you're talking 12 valve. I'm not too sure if the injectors are similar between 12 valve and 24 valve.

 

I thought that the o-ring was to seal up the injector for just incase you get some diesel that leaks out thru the connector tube and the injector. I would take the tappet cover off and see if you're seeping diesel into your oil. If you are change your oil ASAP. SIX BUCKS, ouchie You should have bought your o-rings and copper washers from your local cummin's service department. I think I paid a buck a piece and the o-rings was about the same. I keep a spare set of both sitting in my work bench just incase I want to do a midnight injector change out. Dodge is some time more, some times less. Shop around. I would also check your connector tube ends, if you do enough injector swaps, you can pinch the end off. I have a spare set of those too.

 

Tappet cover? what is that and how do i check?