Nailing refers to valves that need adjusting. That's not just a diesel issue.

I give up
How many times has this been covered ?

http://www.greasecar.com/forum_topicview.cfm?frmtopicID=5518

http://64.233.167.104/search?q=cache:uPk6KTnIcXkJ:www.mbca.org/pages/Star/articles/Tech%2520Forum-S_O.05.pdf+diesel+injector+nailing+noise&hl=en

......."The spring inside each injector will weaken over time. When this happens, fuel gets sprayed into the engine too soon. This can lead to a pre-detonation condition inside the engine. The equivalent to this on a gasoline engine would be the "pinging" that you might hear when you accelerate. "Nailing" is the The term used to describe this condition in diesel engines. Nailing in a diesel engine is much louder than the gas engine's ping and sounds like a loud metallic noise. This is one of the main reasons why some diesels sound much quieter than others when they are idling....."


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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."

Raymond,

Of course you will find dirt in the fuel filters, that's what they are there for.

That doesn't mean the filters have to be changed. A long as the filters pass enough fuel for full engine power, they don't have to be replaced.

P E H

That's exactly right. I don't understand why so many people believe the myth that to keep the fuel system clean you have to change your fuel filters often. It's not like there's a filter bypass in the fuel system.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL