Injectors require maintenance? - PeachParts Mercedes-Benz Forum

benhogan · #1 10-09-2009, 09:50 AM

Other than fuel filter replacements, can you do anything else to keep the injectors clean and spraying well?

barry123400 · #2 10-09-2009, 10:49 AM

Mercedes specifies a spray and pressure test of the injectors every 100k. Some cars have never been done. If fuel milage is pretty good and engine runs basically well just a cleaning with diesel purge will do no harm. Some people seem to forget that injectors are a periodic maintenance item.

They can and will wear with time and milage. Needless to say burning only real diesel fuel will prolong their serviceability. I tend to primarily only fuel at very busy diesel pumps. This goes a long way towards getting less water and other fuel issues. Even once bitten will usually will make a person adopt this habit.

lupin..the..3rd · #3 10-09-2009, 11:47 AM

Use Lubro Moly Diesel Purge to clean them out every 30k miles. Have them rebuilt every 120k miles using new nozzles. Your car will thank you with noticeably more power, better MPG's, and smoother running.

Oldwolf · #4 10-09-2009, 11:53 AM

Running a little 2-stroke TCW3 is supposed to help lubricate the injectors. At least that is what I read. I run with a 200:1 ratio. That means I add 12 oz per 18.5 gallon tank. Some say using it quiets down the injectors although for my car I could not really tell a difference. Try it and let us know what you think.

oldsinner111 · #5 10-09-2009, 12:15 PM

If you don't rebuild them,dribbling injectors can burn holes in pistons.

pawoSD · #6 10-09-2009, 12:54 PM

I've replaced nozzles on three of our 4 diesels (the 4th one runs so well I don't think its necessary yet) and it improved them all. I figure new nozzles every 100k is an excellent thing to do in keeping them running well.

ah-kay · #7 10-09-2009, 01:06 PM

Quote:

Originally Posted by barry123400

Needless to say burning only real diesel fuel will prolong their serviceability..

Anything to back up this statement?

Quote:

Originally Posted by barry123400

I tend to primarily only fuel at very busy diesel pumps. This goes a long way towards getting less water and other fuel issues. Even once bitten will usually will make a person adopt this habit.

I put a water diesel separator in mine. When I need diesel, that is not often, I buy diesel anywhere.

Oldwolf · #8 10-09-2009, 01:34 PM

Do you guys pop test your nozzles yourself? Can you buy them pre-pop tested?

KarTek · #9 10-09-2009, 02:05 PM

I built my own pop tester and do it myself.

dannym · #10 10-09-2009, 02:23 PM

I also built my own pop tester using a grease gun:

http://www.peachparts.com/shopforum/showthread.php?t=123573

The manual states that they should be tested and replaced if worn. It doesn't give any time interval for replacement.
Your supposed to remove the guts and holding the bottom section pull out the injector tip 1/2 to 3/4 of the way out. If the tip pulls back in it's good. If it doesn't it's bad. It should have a good coat of diesel fuel on the parts for this test.

That's what the manual says.

Danny

barry123400 · #11 10-09-2009, 02:44 PM

Quote:

Originally Posted by ah-kay

Anything to back up this statement?

I put a water diesel separator in mine. When I need diesel, that is not often, I buy diesel anywhere.

The remark was not anti wvo. Just less chance of carbonization or steam damage to nozzles from residual water in the wvo by burning the best and cleanest diesel you can get your hands on. Randomly purchasing diesel just anywhere will eventually sting you.

Most smaller volume dealers are fueled from multi use bulk carriers as well. This is asking for it if the carriers tank was was not cleaned out properly from its last type of cargo. There is no way a truck stop is going to survive having fifty non running trucks up the road from their fuel. Safest place of all to fuel.

Most wvo users do not have a good water separator installed with their setups. It is of course good you do.

Purchasing diesel fuel especially at very low volume outlets is bad. Difficulties occur at them too often to be random. For example low volume outlets may still vend summer fuel in the early winter months. If you ever see a heat device on a diesel pump in cooler weather never buy fuel there. They have to heat the pump to even get it to flow.

Diesel911 · #12 10-09-2009, 04:30 PM

Quote:

Originally Posted by Oldwolf

Do you guys pop test your nozzles yourself? Can you buy them pre-pop tested?

You can get them used and new on eBay, both can be expensive. You also need to be sure they have the fittings for Mercedes Injectors.

I bought a brand New one at what I felt was a good price but it did not have the Mercedes fitting. The company wanted $30 plus shipping just for the fitting.
I was able to modify one of the others that came with it so I did no have to buy one.

There is 2 do-it-yourself threads on building your own from a Hydraulic Jack.
There is also a company that will sell you nozzles and thier version of the Hydraulic Jackp pop tester.

pawoSD · #13 10-09-2009, 05:27 PM

I've never pop tested mine, I just replace the nozzles. Eventually I will build or obtain a home pop-tester.

Old300D · #14 10-09-2009, 05:44 PM

I've run 50k miles so far on a set of used, balanced injectors with straight homebrewed biodiesel and the engine still runs smooth and smoke free.