I'm looking to replace the nozzles on my '78 300D (280,000+ and I don't think they have ever been replaced). Hopefully, it will improve my mileage some, decrease some of the smoke I get occasionally on start-up, etc. I am considering the Monark nozzles many of you have written about on this site. I don't have a pop tester, so I went looking around Oklahoma City today for a shop that could test them for me. I got a price quote of around $20 per injector - sound reasonable? I don't even know what to ask them to make sure they know what they're doing...? Do I have to pop test new nozzles?

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

Ask (via private message) Sean Watts at Hessin Imports.

Is that the price only to test them or the pric to rebuild them with your new nozzles?

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84 300D, 82 Volvo 244Gl Diesel

Rebuild them with the new nozzles - I think. He just wanted to know if i was going to supply the nozzles - but he could have heard me say that I would bring them in already rebuilt with the new nozzles.

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

Call them on the phone and ask them again. I think $20 for eachinjector is OK if they rebuild them with your nozzles. It takes 15-30 minuets per each nozzle to clean, lap the precision surfaces and re-set the opening pressures (Pop-Test). If you figure a labor rate of around $50 per hour that $20 each is not far off from that.

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84 300D, 82 Volvo 244Gl Diesel

I agree that $20 per injector to rebuild them with your supplied nozzles and set pop pressures is more than fair. Just make sure you tell them you want them matched to spec (within about 100 PSI is usually the spec most shoot for). If they don't set the pop pressures and match them then you could do the rebuild yourself and save $80.

Just to pop test them alone many shops do for free or a very nominal charge.

I'm not sure how crucial matching the pressures is, but it is a "best practice" to do so and as long as you are going to the trouble of replacing them you might as well do the best job you can.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz

Matching the pop pressures is very crucial.

"The difference between any two injection nozzles within one engine must not exceed 5 bar positive."

http://www.pauldrayton.com/uploadfiles/merc/Service/W123/Index/617T/07MechElec.html

Build your own pop tester:
anyone know how to use a diesel pop tester?

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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A set of injectors NOT operating at the same pressures have a different injection timing for each cylinder. (Lower pressure = earlier injection, higher = later) When they are off it causes, among other problems, torsional vibration in the crankshaft. Then you suffer rougher running, less economy, power loss and worse emissions as well.

To pop and balance, H.A.I. charges $12.00 per injector regardless of set size. Also, don't forget to use new heat shield washers regardless of where you get them.

RYAN, I sent a regular email.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!