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Om606 nailing HARD after new nozzles
I sent the injectors to be rebuilt to stock pressures, new nozzles made by bosio. New heat shields, installed correctly. OEM parts all the way. Injectors torqued to spec. Any ideas why it’s nailing like a ball peen hammer on a nail? All the fuel lines plastic have been replaced. There is zero leaks in the system. Car was quieter before the nozzles.
Do the nozzles need time ti break in a few hundred miles? Car has 228k. Religious oil changes. I was going to add cetane booster and take it down the highway up to 80 and see if it helps.
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Only diesels in this driveway. 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
#2
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With the presumption that everything else was done correctly (it is easy to get the heat shields in upside down). Normal stuff. Bosio's nozzles are a bit louder. Next people have reported that nailing demised in use. They say changing the opening pressure on the injectors changes the timing a bit. Retiming the fuel injection pump may or may not help depending on what the cause is. Did the engine sit unused for a long time? If so sticking piston rings can cause low compression which can contribute to nailing. Air in the system can cause nailing. Does the nailing decrease after the engine is up to the full temp?
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84 300D, 82 Volvo 244Gl Diesel |
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Only diesels in this driveway. 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
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Try the cetane booster. The problem might be with the fuel you use. It sounds as though you have the usual suspects eliminated.
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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now |
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This subject I have seen over the years come and go on the forum and most threads always recommend putting at least a 1000 miles on the car and normally this cures the nailing.
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How is your engine power? Is it difficult to start? If you have issues with either of these I would worry, but if not, you may be OK. When I rebuild mine I got a lot more power immediately, but it sounded like a rock crusher for the first 500 miles. Then all was smooth sailing. -Henry |
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Don't want to be a broken record, but this was my experience too. Cetane booster (almost any kind) in the fuel will help. And, it takes time for them to break in. In my case it was Firad nozzles in my om617 and it only took a few miles.
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Only diesels in this driveway. 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
#9
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I have wondered about this on and off for a long time.
Any possibility air is in the Hard lines and takes a long time to work it's way out? There has to be some form of rational explanation? |
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