Antifreeze

[RJ]

Laryn (and others) -

Here you go, right from the horse's mouth, so to speak:

http://www.detroitdiesel.com/support/on-highway/manuals/Lubricants_Fuels_Coolants/7se298.pdf


FWIW & HTH. . .

[Barn Owl]

Great link Russ. It is getting late, and was only able to give it a glance; therefore, I might find more details during a later and more through read. This is a 2002 publication and it gives the reason for not using conventional automotive antifreeze is due to high silicate or possible phosphates that were used at that time (4-16) and because it offers no liner pitting protection (4-9). From reading the side of the newer automotive antifreezes the formulation has changed to a non-silicate formula. I have been in several truck shops over the past year and they sell the same stuff in a jug for trucks that one can get for cars at any local parts store. The difference being they will also sell the SCA's to add to it and the test kits to check it. All of the antifreeze listed in the dd manual on the supplied chart is "fully formulated antifreeze" and the DDC Power cool does contain nitrites that are added to "inhibit cast iron corrosion and cavitation".


Having read several old manuals and publications, and because of this post,  going back and rereading some, I have noticed that nowhere is it mentioned to add any additives to prevent cavation. I am lead to believe that cavatation was either not well understood then, or because of the design and/or low hp engines, it was not an issue and therefore wasn't addressed. I would also think it would be wise to obviously use the most recent publication available, and if the new standard is to use SCA's in all engines, then that is what one should do. I also need to add that apparently the 8V71 will run a long time without SCA's and have no ill effects due the many testimonials that "old time" mechanics have given. As I have stated earlier, I have it in my bus, but I wouldn't loose any sleep over it if I didn't.  Everyone that has an interest in this needs to educate themselves and do what they feel is in their best interest.


Phew! I am running out of time and steam tonight but I have read a few articles that I want to follow up on regarding the new automotive formulation. It seems that some might meet the requirements for the fully formulated recommendation. I have a tile floor to install tomorrow in the laundry room and I had better move on for now. Maybe someone else could follow up on this.

[gus]

As I remember reading the 4104 manual recently the only anti-freeze recommended is the plain old ethylene glycol type used in autos.

The filters discussed in the manual are mostly for keeping debris out of the circulation.

The additives discussed in the manual are to replace the anti corrosion additives normally included in AF which wears out in 6 mo to a year. The freeze protection part of AF does not wear out but the anti-corrosion additive does.

From reading the manual my interpretation is that regular AF will protect any series 71 DD all it needs to be protected.

Cavitation of pumps knowledge has been around as long as rotating pumps. Probably the first knowledge of cavitation was developed when ships first started using propellers which is a really big problem.

[jackhartjr]

Gus, the big ole Scenicruiser manual I have says to not use the water filter when using AF, it says to block it off.
I do know that for years Greyhound did not run AF, they kept them running and had instuctions for the drivers to drain them if the motor quit in the cold!
For what it's worth.

[makemineatwostroke]

Ok guys i will take one more shot at this topic there is two designs of the 8v71 engine the old and the newer.The old one had the oval inspection covers and had no coolant around the cylinder walls this engine was redsigned in the 70s because the top half would move and cause liner problems.The new design has smaller inspection ports and the cylinder walls are surrounded by coolant by far the better engine.All I am trying to tell you is a manual written in the 50s,60s and early 70s may not apply to the engine you have in your bus as most of the old style 8v71 are not around anymore but a few are   Happy New Year everyone

[Barn Owl]

there is two designs of the 8v71 engine the old and the newer

I didn't know that.

Thanks,

Laryn

[gus]

2stk,

Very good info, I didn't know that either!