CJ-4 class Diesel Oils

[Zoltan]

In addition to their on-highway applications, Chevron Delo 100 Motor Oils are recommended for use in two- and four-cycle diesel engines in farm machinery, marine service, construction equipment and other off-highway applications.

I am amazed that such thing as 2 stroke diesels existed. Are they still being made?

[asavage]

A 2-stroke diesel is nothing like a 2-stroke lawnmower or motorcycle. In particular, it has a poppet valve, at least the ones I've seen do, and the crankcase is not part of the intake system.



The common Detroit diesel 2-strokes use a blower (belt-drive supercharger) to pressurize the intake to make this work.

[plenzen]

Actually Nissan made a 2 stroke 75 series industrial/marine application as well. Other than the yellow paint and the metric fasteners it looked identical to the 71 series Jimmies. The big difference was the fuel system in that it used an inline pump the same as the 22 and 33's use. Jimmies had a pump/injector driven by the cam on each hole so it was much more reliable and not near as noisy!! If you ever heard a "Screamin Jimmy" then you have only heard half the noise that an engine that size can make! WOW!! They used to like to fling red hot pieces of stuff around engine rooms too. Blowers were gear driven and turned twice crankshaft speed. INTENSE!!! 3,4,5,6, and V8 configs. No longer made! Hmm wonder why? We used to get combat pay to go service them.

Paul

[asavage]

I think some of the UD engines are 2-cycle. Seems to me I read that somewhere. I've done maintenance on several UDs but you don't need to know much about them to change filters

I have a Nissan Diesel Engine Service Manual here for the the PE6 and PE6(T) engines, and it's four-cycle, a large straight Six with two three-cylinder heads. Displacement is 11,670cc. Yup: nearly a twelve-liter Nissan Six diesel. Think an SD33 is large?

[philip]

SNIP- I am surprised that you find this antique oil spec single-viscosity Chevron stuff a boon or at all desirable. -SNIP-

In Chevron distributors ... all over the world ... still sells Delo100 oil and in several weights for 2 cycle Detroits, agriculture, and some trans/box.

http://www.yachtsurvey.com/comparing_diesel_types.htm
"Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. Its service record is unparalleled."


I also found Delo 100 for sale ($8.99 gallon) at a distributors in Orange County, CA. So, I bought a couple and will try it on my next oil change.

http://www.chevron.com/products/prodser ... tobuy.shtm

[asavage]

Delo100 oil and in several weights for 2 cycle Detroits, agriculture, and some trans/box. . . . bought a couple and will try it on my next oil change.

Why?
What goal are you chasing?

[philip]

Why? What goal are you chasing?

As stated before ... these SD have cam/flat tappets which these new CJ have barely acceptable flat tappets. There are a couple of oil supplements for this but I'm looking out a ready to go oil. Delo will do that. The CF is close enough to the OEM CC/CD.

[plenzen]

Just as a side note here Yanmar Industrial and Marine engines all have flat tappets and they are reccomending the use of 15-40 with a CI4, CH4 or CF2 rating. Dont know if that makes any difference here or not.
I suspect that the valve springs in some old SD's are starting to get pretty peeked by now. What about some of the snake oil additives like
Z-Max or Dura-Lube or Slick 50 or some of the other "Witch Craft In A Can" thngs. Anyone tried any of those?

P

[asavage]

Slick-50 is BS, forget it.

SD valve springs are not highly stressed and will easily last the life of the engine.

[philip]

Slick-50 is BS, forget it.

SD valve springs are not highly stressed and will easily last the life of the engine.

The engine you disassembled, did you see any of this in your SD?

This is from Galen while overhauling his HOT SD22.

[weezledeezle]

Heya All, just noticed all the hubbub about oil, thought I might throw in my own two cents worth. Mobil1. I have been using 0w40 in everything I own from a Briggs 12hp genny I built, to my Honda 750 streetbike, and any other engine I come in contact with. I have gone 50k miles in my Jeep only changing filters and adding a bit for loss and could see no reason not to have left it in longer. Synthetic is good, chemists build these specific molecules exactly the way they want them, with very specific shear strengths and flow characteristics. The additives give better acid and soot control as well as altering viscosity curves where needed. They are far better at dealing with higher temps as well- I have heat seized many an air cooled engine from overworking- dead with conventional oils, unload and restart to cool if using synthetic. Not all synthetic are created equal though- hard to know whats in that walmart bottle that says synthetic motor oil. Amsoil or Mobil1 are the only things I will even consider, and I am sticking with M1 just for availability and cost. As for the little SD22 going into my Jeep, thats getting the M1 5w-40 for diesels and good filters after a good cleaning with delvac.

[asavage]

Not all synthetic are created equal though- hard to know whats in that walmart bottle that says synthetic motor oil. Amsoil or Mobil1 are the only things I will even consider, and I am sticking with M1 just for availability and cost.

In my book, the term "synthetic oil" is reserved for oils whose base stock is API Group IV. The applicable term is poly-alpha-olefin (PAO). Its presence indicates a Group IV oil. AMSOil, Mobil 1, Redline, Royal Purple are all retailers of PAO lubricants.

Castrol, Chevron, Valvoline, Pennzoil are not retailers of API Group IV oils, though Castrol once was, prior to about 1997. The formulation and refining process for Syntec changed from PAO to severely hydrotreated.

[asavage]

I finally saw Galen's pics. I did not scrutinize the cam in SD I tore down recently, because I left it in the block for the new owner to deal with, and that engine had a catastrophic failure due to unknown cause(s), so any data I'd glean from it would also be suspect.

[Nissan_Ranger]

If you ever heard a "Screamin Jimmy" then you have only heard half the noise that an engine that size can make! WOW!! They used to like to fling red hot pieces of stuff around engine rooms too. Blowers were gear driven and turned twice crankshaft speed. INTENSE!!! 3,4,5,6, and V8 configs. No longer made! Hmm wonder why? We used to get combat pay to go service them.

Paul

We used to say that a 'screamin' Jimmy' was a device to turn perfectly good diesel fuel into noise and smoke

N_R

[plenzen]

A bit "wordy" but here goes.

This is what I found today talking with a lab tech at Petro Canada. (Petro Can)

I originally enquired about the Zinc levels (ZDDP) in the newer classes of oils. I had actually called and spoke to the tech at Chevron as well and got very similar information from him, but unfortunately was not able to spend as much time on the phone with him as I did with the tech from Petro-Can.

I enquired about the Petro "Duron” 15/40 CI-4 that I presently use. (fyi: I got very similar, if not exact numbers for the Chevron Delo 400 CI-4)
The Petro-Can tech tells me that the CI-4 15/40 that I am presently using has 1380 PPM zinc. He says that the CJ-4 that will eventually replace it has 1200PPM.

I was advised by him that the older single viscosity oils, 30 and 40wt, are still manufactured and only have 1100 PPM. They, however, do not recommend the use of single “Vis” oils in 4 stroke diesels as they tend to "use it", and were, and still made to accommodate the 1000's of two strokes that are still around, mostly in industrial applications. He says that although the new single “Vis” oils are still made to the old CH specs, the zinc levels are only around 1100ppm, and, he did not have any data on the zinc levels in the CG and CH oils that were made in the 70'/80s. He thought that they were around 1500 to 1700 but had to be to make up for the "lesser quality" of the "base oils".

He went on to say that today’s "base oils" that the new oils are made from, are, by far, a lot better than the older ones where these high levels of zinc had to be added to make up for the difference. He said that the new additive packages of today more than make up for the slight loss in zinc and phosphorous that has occurred. He mentioned that the base oils of today by themselves, with no additive package at all, would provide better protection that the CH & CG oils of the 70's and early 80's. This is why they were able to reduce the zinc in the single “Vis” oils for the 2 strokes. The reduced amounts of ZDDP, phosphorous, reduced ash, and oxides, plus a bunch of other additives are to accommodate today’s particulate filters that are becoming ever present.

It is not word for word, but that is the gist of the conversation. I was on the phone with him for about 45 minutes.

I should have asked him where it was in fact I was calling, but it sure sounded like the US someplace, just because of his accent. (Southern, but to a Canadian y'all sound like Foxworthy,,,,,,,,,,, eh? )

I waited on “ignore” for about 15 minutes before actually getting through.

Paul