Injector wear after 30,000 miles

[Slim Shady]

Ok, to clear up the statement, I have my truck apart for some RD work and decided to check my injectors while I have it apart. I have an OTC nozzle checker. The injectors leaked down and four of them had a small peeing just before popping. Now if I hit the injectors fast they all had a decent pattern.

I decided to have them reset on pop pressure to make them all even, I had two at 1900, four at 2000 and two at 2100 psi. They are Bosch re-manufactured I bought through NAPA with India nozzles. The injectors were taken apart and the nozzles look scored on the side of the nozzle.

The shop I took them to informed me that I have a Lubricity problem and that he would not warranty the new nozzles if I came back in 20,000 miles with the same problem.

Now the quandary I have used bio diesel or two cycle oil religiously since the nozzles were replaced. I am going to have a machinist look at the nozzles and see if the Rockwell number is low or the material is poor.

I shouldn't have had to replace nozzles at this juncture! What do you guys think could have caused this problem? Can't imagine what the inside of my IP looks like then.

 

[bk95td]

I have read that the bosch -india nozzles are much lower quality materials than bosch germany. This came from a mercedes fourm. I found a place where I can get german made nozzles but minimum order was something like 200 and none were available to try because they were out of stock.There is some bosch -germany marine nozzles on ebay. I put a set in for Buddy.

 

[Crankme69]

Maybe the Bio is creating some corrosion issues?

 

[Acesneights1]

The India Nozzles are junk like everything else that comes from there. I'll sell you a set of brand new Bosch german ones cheap. I bought them by accident thinking they were the whole deal. They are just tips.

 

[bison]

That seems to be generally the thing with asian aftermarket critical engine parts.The quality just does'nt seem to be there.
I would rather pay a bit more and get the germany made bosch nozzles.

I would think bio diesel would cause a bit of gumming,not cause exessive wear.

IMO I think your IP will be OK cause if it would have the same wear as you noticed in the injectors it would've manifested itself allready by hard starting and less power

 

[buddy]

Why would lubricity cause scoring on the outside of the nozzle, what goes on on the outside? Its probably because you have low compression Either way they'll blame you.

 

[buddy]

Oh and its this kind of stuff why I have been recommending injectors as 50k mile maintenance, and having stock nozzles balanced/set to 2250psi, since it degrades over time it seems, and we put a lot more fuel in that they did stock.

 

[Veg_Out]

I think we all should check them over. Between out of balance injectors and a bad Harmonic Balancer, my Suburban's been down for 45 days. 3 piece crankshaft!

 

[Slim Shady]

The pintle in all of my nozzles has scoring on the body and shows scoring on the bore. I think there is more of a wear issue with nozzles than we might be aware of. I know I use a quart of two cycle oil to the tank every fill up. Guess I need more two cycle oil to stop the "lubricity issue"

 

[buddy]

It could just be because we push higher fuel rates, means higher peak injection line pressure and injection pressure and higher boost compressing hot air againt the injector, and plus those glow plug tips get pretty hot right next to the injector tips. The injector may be a casualty of the pursuit for power.

 

[Slim Shady]

That may be a true statement, and the reason, I just don't like purchasing something from someone with a preface that starts with if you have the same issue in 20000 miles I won't warranty them. Makes me kind of uneasy.

 

[buddy]

Well, you also need to take into account that in the truck they will work better than on the pop tester because the injection event is like milliseconds and in those milliseconds it goes up to 10,000psi not just the pop pressure the tester does.

 

[Slim Shady]

Yeah I know that as well, but I wanted the injectors set to a specific pop pressure and to be within 50 psi of each other. I want to see how smooth a 6.5 can run.

 

[bison]

IMO higher pop pressure is not the cause of the wear.
Most diesels i've rebuild injectors for ran between 2700 to 3400 psi pop press,some had over 10,000 hrs on them and were still decent.

 

[bison]

The pintle in all of my nozzles has scoring on the body and shows scoring on the bore. I think there is more of a wear issue with nozzles than we might be aware of. I know I use a quart of two cycle oil to the tank every fill up. Guess I need more two cycle oil to stop the "lubricity issue"

I done rebuild injectors for a friends 94 last yr,just because i figgured it was about time.They had over 250.000 on the originals,surprizing enough they all had a decent spray pattern but where less then 1800 psi,no pissers either.The guy never used an additive or oil in the fuel,never had a LP , OPS or PMD issue either.
You go figure

 

[dracor85]

while we are on the subject of Nozzles, would it be a possibility to have a billet set of nozzles machened and/or stockers either tempered or cryogenicly treated for extra strength? would that reduce wear on them over time? also how about the pintles with the same treatment? I havnt torn a injector apart or seen much with diffrent wear on diffrent metals but its just a thought, what do you guys think?

 

[NVW]

For the price of a set of rebuilt inj, 100k miles seems pretty reasonable maintenance.

 

[buddy]

If youre willing to wait until 100K miles. I wouldnt. Obviously people wiat longer, but a lot of people also have high EGTs, and cooling issues. Poor spray and low pop can cause less effiicent combustion and cause heads to heat up.