I just replaced my injectors with Marines and I have this pesky leak. I have removed and reinstalled, etc., checked that the copper ring seams OK, etc. It is on the back pass. side and I know these back ones get the most heat (I can feel it!). Checking the return lines, replacing them and after I start it up it takes about 30 seconds to start dripping. That would lead me to believe that it is a return line. The injector line does not leak. When I look with a mirror-on-a-stick with a flash light it seems like the leak is peculating from the contact points injector to block. No squirts are evident. I just can't figure this out and the truck does run a little choppy like it is loosing some of the combustion from this cylinder, but not as bad as a typical inj. line leak. I know a return line can cause erratic idling, but this is a puzzler. When I took out the injector last lime, I had heavy carbon on the block side of the copper ring. I have these puppies in tight. The first time I had a problem, I went to loosen the line and the injector was loose and I had to use a 7/8" wrench to hold the injector while loosening the line. What a doozie that was. Anyway, after tightening up the inj. and the line and checking the returns, I noticed some fuel moving around the head to inj. seal. After reving, it went away. Then a day later I had a pretty good amount of diesel leaking on the ground on that side. Again, I took eveything apart and put it back (several times now) and can't get it to stop.

Any ideas?

Im sorry i dont mean to hijack your thread but what is a marine injector? How does it differ from a stocker?

Marine injectors yield better spray pattern and power. They spray more fuel (supposedly).

SMog pump - Is that the doodad on the valve cover going into the intake? If so you might want to put it back. I returned mine back to stock. I heard somewhere on here that it provides vacuum for the crankcase, thereby allowing lubrication of some crucial elements. Maybe those in the know can elaborate further.

I put marine injectors in mine 2 Thanksgivings ago and just before last Thanksgiving I noticed I started getting a leak. I cleaned it all off wth brake clean and dried it, and noticed it got wet again right where the injector halves go together. I called Heath diesel and Todd told me to take the injector out, loosen the 2 halves, and re-torque it. Then put it back in. It still leaked, so Todd sent me a new injector, and when I got it, I sent him, my other one back. It was wierd it would start leaking there almost a year after installng them.

Marine injectors yield better spray pattern and power. They spray more fuel (supposedly).


The Marine injectors do not spray more fuel. The fuel amount is controlled by the IP. Always has been, always will be. For the record the stock set injectors are more than capable of flowing twice the fuel that the IP feeds them.

Yes but they make the buyer think it has more power and makes the seller happy because they can charge over $100 more for them.

Yes but they make the buyer think it has more power and makes the seller happy because they can charge over $100 more for them.

exactly. dieselpro said he knows the difference between oem set and HO injectors. he didn't say what it was however.

To the Marine injector believers, the injectors in these trucks are opened via pressure, hence pop pressure. injectors in newer diesels are piezo-electric(i believe) and can be changed to allow more fuel, along with rail pressure adjustments. Mechanical pop pressure injectors cannot be adjusted for more fuel flow, as they don't control said fuel flow to begin with.

I know they sure look the same.

Any help on the leaker?

Spray the injector down with brake clean to clean it off. Then start the truck up to see where its leaking from. If its leaking from where the injector line attaches to the injectors, its probably cross threaded.

If its leaking in the middle of the injector body find a diesel shop to inspect it, or find the torque specs and see if you can tighten it up to spec(if said parts are loose).

The cheap 'MARINE" INJECTORS ON EBAY are Chinese and are known for leaking. The little tubes pull out and leak and the bodies leak

The cheap 'MARINE" INJECTORS ON EBAY are Chinese and are known for leaking. The little tubes pull out and leak and the bodies leak


Any Chinese injectors are cheap junk. You really get what you pay for with injectors, there's no doubt about that.

I went with heath just to avoid any possible issues if one starts to leak or anything like that. Don't use el-cheapo injectors, as you can do more damage to you motor which will cost more money that what you saved being cheap on the injectors. A bad injector can and will take pistons if not the entire motor with them.

Spray the injector down with brake clean to clean it off. Then start the truck up to see where its leaking from. If its leaking from where the injector line attaches to the injectors, its probably cross threaded.

If its leaking in the middle of the injector body find a diesel shop to inspect it, or find the torque specs and see if you can tighten it up to spec(if said parts are loose).


It ain't freakn' cross threaded...Daaaa......
I know what happened now..I got a PM from a guy that knows.
They are Bosch.
Thanks
Bob

I just replaced my injectors with Marines and I have this pesky leak. I have removed and reinstalled, etc., checked that the copper ring seams OK, etc. It is on the back pass. side and I know these back ones get the most heat (I can feel it!). Checking the return lines, replacing them and after I start it up it takes about 30 seconds to start dripping. That would lead me to believe that it is a return line. The injector line does not leak. When I look with a mirror-on-a-stick with a flash light it seems like the leak is peculating from the contact points injector to block. No squirts are evident. I just can't figure this out and the truck does run a little choppy like it is loosing some of the combustion from this cylinder, but not as bad as a typical inj. line leak. I know a return line can cause erratic idling, but this is a puzzler. When I took out the injector last lime, I had heavy carbon on the block side of the copper ring. I have these puppies in tight. The first time I had a problem, I went to loosen the line and the injector was loose and I had to use a 7/8" wrench to hold the injector while loosening the line. What a doozie that was. Anyway, after tightening up the inj. and the line and checking the returns, I noticed some fuel moving around the head to inj. seal. After reving, it went away. Then a day later I had a pretty good amount of diesel leaking on the ground on that side. Again, I took eveything apart and put it back (several times now) and can't get it to stop.

Any ideas?your injector is leaking between the 2 body halves,remember it coming loose when loosening the fuel line.
you will have to take the injector out,clamp it in a vice with the flats between the return tubes and torque the 30mm hex body to 55 lbs.
this may or may not seal it again, if still leaking, then the mating parts will need lapping as well.

Why do so many believe the marine injector BS?, if the rest of the engine is still stock.

your injector is leaking between the 2 body halves,remember it coming loose when loosening the fuel line.
you will have to take the injector out,clamp it in a vice with the flats between the return tubes and torque the 30mm hex body to 55 lbs.
this may or may not seal it again, if still leaking, then the mating parts will need lapping as well.

Why do so many believe the marine injector BS?, if the rest of the engine is still stock.


THanks, but I do know what happened now and I will relive it to help others that don't know much about what they are preaching. I had an inj. line leak on that injector and when I went to tighten it, the inj. was loose. I took out the inj. and put it back in. When I did that, I reused the crush washer and that is a no-no. Still learning and I am thankful for the PM's and good knowledgable folks out there. Blasting me about marine inj. is useless. I do believe in them as this is the 3rd truck that I have enhanced with increased fuel delivery with these injectors and some other tweaking. My Tahoe is a smoker. It is chipped out. My 96 K2500 is also. The K3500 in question has a marine DB2 pump that puts out the fuel much better than stock and it move out well.

The dis-information is something to weed through on here. I had a real time with the bad info in putting in the mech IP into the 1998 and w/o a standalone. Eveyone said it would not work. The stock ECM controls the tranny quite well, contrary to popular opinion. I found my way through the dis-information and now I just post my real life stories just to help people that need to know.

Thanks for the info.


Bob

THanks, but I do know what happened now and I will relive it to help others that don't know much about what they are preaching. I had an inj. line leak on that injector and when I went to tighten it, the inj. was loose. I took out the inj. and put it back in. When I did that, I reused the crush washer and that is a no-no. Still learning and I am thankful for the PM's and good knowledgable folks out there. Blasting me about marine inj. is useless. I do believe in them as this is the 3rd truck that I have enhanced with increased fuel delivery with these injectors and some other tweaking. My Tahoe is a smoker. It is chipped out. My 96 K2500 is also. The K3500 in question has a marine DB2 pump that puts out the fuel much better than stock and it move out well.

The dis-information is something to weed through on here. I had a real time with the bad info in putting in the mech IP into the 1998 and w/o a standalone. Eveyone said it would not work. The stock ECM controls the tranny quite well, contrary to popular opinion. I found my way through the dis-information and now I just post my real life stories just to help people that need to know.

Thanks for the info.


BobGlad you found your inj problem,but the only crushwasher used in the injector is onderneath the nozzle in the very bottom,and is a carbon seal, it will not cause leaking fuel.and a bad copper washer will leak combustion gasses,but no clean fuel either.

Glad you found your inj problem,but the only crushwasher used in the injector is onderneath the nozzle in the very bottom,and is a carbon seal, it will not cause leaking fuel.and a bad copper washer will leak combustion gasses,but no clean fuel either.


I thought that also. Maybe it is a stinking return line after all or a loose top-to-bottom seal. Sometimes common sense escapes me.

Thanks

Bob

i have the same issue, any developments?