Mercedes 4.20 Nani

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Mercedes 4.20 Nani

Postby jcreilly » Sat Sep 23, 2006 12:20 am

My 1986 41T has the Nanni 4.20 72 HP diesel. It has just over 3,000 hours. I'm wondering what would be the optimum / desired RPM range to use without stressing the engine. I rarely go beyond 2100 / 2200 on the tach. I'm told that perhaps the engine should have more load put on it. An oil analysis last season revealed no issues. Other than several alternators over the years there are no other issues. Thanks for any comments. Jim
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Postby johnrobinson » Mon Oct 02, 2006 11:02 pm

I have the same engine and typically run at 2100 - 2250rpm for optimum fuel consumption . . . anymore RPM and with the marginal increase in speed becomes a large increase in fuel consumption . . if you look at the engine power curve in the engine manual this graph shows the "cruising" rpm range for best performance . . John Robinson s/v Crossings
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Nanni Deisel

Postby jcreilly » Mon Oct 02, 2006 11:10 pm

Great, John. Many thanks. I think that's about where I am with RPMs but I will dig out the manual, as you suggested. Best wishes, Jim
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Re: Mercedes 4.20 Nani

Postby olywadan » Sun Feb 11, 2018 10:06 pm

Blast from the past... I'm guessing these are the Mercedes 4.240 72hp models? Is there a way I could get a copy of said manual? I have this engine but no info on rpm and fuel consumption. Thanks!
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Re: Mercedes 4.20 Nani

Postby gaffer » Tue May 15, 2018 1:08 pm

I have a 1984 Merc 616 Nanni 4.240 72hp. Entirely rebuilt 2 years ago. I have workshop manual and the Nanni Parts catalogue. Let me know if you still need a copy. Mike
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