Old Diesel Engines And ULSD Fuel - Mercedes-Benz Forum
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#1 (permalink) Old 02-16-2014, 08:18 AM
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Old Diesel Engines And ULSD Fuel

There are quite a few people in here, guests included, that have older and much older diesel running vehicles. They may not even be Unimog.

The given is that the fuel has changed over the years at least twice in the recent past.

This can and has caused problems with the oil burners.
Some has been said about fuel alternatives. Typically or for the most part, the topic is geared toward cost per liter or gallon., then as an example of using cooking oils.

Has everyone or just a small number looked at the fuel itself, and addressed the issues or just pull up to the pumps and fill it up ? and deal with the possible problems later ?
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#2 (permalink) Old 02-16-2014, 08:48 AM
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Diesel in Germany even in the early days of mogs never had as much sulfur as NA diesel. The difference is not as drastic as for domestic engines.
NA diesel is still of lower quality (lower Cetan number) than EU diesel. Makes for worse mog stink in cold weather.
NA diesel 500 ppm sulfur
NA ULSD 15 ppm
German diesel 70s 300 ppm
German diesel 80s 200 ppm
German diesel 90s 50 ppm
EU diesel now 5-10 ppm

Last edited by BloodyGerman; 02-16-2014 at 09:09 AM. Reason: Added ppm numbers
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#3 (permalink) Old 02-16-2014, 10:11 AM
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My point is just that what you posted. The ppm of sulphur in the fuels of yesteryear Germany going back to the 70's was 300 ppm.

lm not sure what the levels were in the 60's or further yet, the 50's. They can only be the same or even higher.

What we do know is, the engines manufactured (Unimog ) back then reflected the fuel they were fed.

Here in North America, the fuel had changed. Just one of those changes was a fair to say reduction of sulphur in the fuel (low sulphur fuel ) and then again to ultra low sulphur fuel. This has only been since the latter 90's, taking off since about 2003 and beyond.

The characteristic of that sulphur was lubrication of the fuel pump. With such low levels today, those old fuel pumps are now lacking the necessary lubrication because the fuels today are not available for those applications.

The end result is fuel pump failure or catastrophic failure. Steps can be taken to slow that down. Fuel additives. However, it isn't sulphur, rather another type of lubricity means. (That's why l didn't include cooking oils or bio-diesel)

There is no doubt that fuel pumps are more than expensive on these engines. End result, do something now, do what ? The older the Mog, the more critical it is. Are these older vehicles going the way of the dinosaur ?

Cetane on the other hand promotes a quicker ignition of the fuel and a more complete burn reducing particulates.
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#4 (permalink) Old 02-16-2014, 10:44 AM
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Pumps from the day differ very little from mechanical pumps of current day machines. I have zero concern. Plus the primary lubrication for the pump is the oil it contains in its case. The fuel lube issue is more of an issue for injectors, but again not much has changed from the 60-70's to the 90's and even early 2000's for road going trucks.

FOR SALE: 1985 U1300L 200HP $50,000
FOR SALE: 1969 404.1 crawler mog $25,000

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#5 (permalink) Old 02-16-2014, 10:53 AM
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And there's always:

-Trev
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#6 (permalink) Old 02-16-2014, 10:56 AM
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here a lot of People with old diesels add a little 2-stroke engine oil (like the one for a chain saw) to the diesel fuel with best results.
if interest i'll find out how much they add. it's only a few % ore even % of %.

Last edited by MagMog; 02-16-2014 at 11:02 AM.
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#7 (permalink) Old 02-16-2014, 10:57 AM
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Is'nt your fuel pump a Bosch ?
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#8 (permalink) Old 02-16-2014, 11:08 AM
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Every OM366a engine I've owned (and seen) has an oil line to the pump as well. Bosch pumps.

-Trev
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#9 (permalink) Old 02-16-2014, 11:18 AM
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Virtually all mog diesel have Bosch pumps. The old pumps are virtually identical in build all the way through into the 2000's. Not much has changed.

FOR SALE: 1985 U1300L 200HP $50,000
FOR SALE: 1969 404.1 crawler mog $25,000

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#10 (permalink) Old 02-16-2014, 11:20 AM
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IP lubrication delivery.
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-Trev
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