Quote:
Originally Posted by 78w72
Are the bearings in a 5 speed transmission the same as bearings in a engine? I'm not too familiar with manual trans internals but I don't think they are subject to the same type of forces that require an oil film under pressure to keep moving parts separated... let alone cam/lifter surfaces under extreme pressures and wear or piston to cylinder wall wear etc.
Just curious what others have done or heard about using trans fluid in an engine to help mike understand why it's not a good idea, Amsoil explains its pretty good about lowering oils viscosity when used at 1-2qts... but completely filling an engine seems very counterproductive and just asking for trouble.
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I want to make it clear to the new commers to this Thread that I don't run my Engine on Trans. Fluid. I only flush out my Engines for 1/2 an hour from time to time or when I purchase somebody else's junk ride that I know nothing about. Then I inspect the Timing Gear and chain to see how much slack is in the chain in order to get an idea on the milage of the Vehicle, providing it has not been changed before, there are differences between the factory Timing Gear with the Teflon coated sprockets and the aftermarket one that has not been coated.
Yes, the Motors Crank rides on a film of oil between the Journals as well as the "041" Cam in my 428 ci HO Pontiac. Without this film of oil, the Motor will seize up. Now Motor oil that I use is 10-30 Viscosity, I think for argument's sake that ATF is some ware in that Viscosity range? Thus, there is not a problem there.
Oil vs. Trans. fluid, Trans. Fluid has cleaners to keep debris out of the small areas that they have on the interior and exterior, like in the Valve Body. After building mine, that contains a smaller screen, before the Governer Valve to keep it clean so the Trans always shifts as it was designed to.
Motor oil does not contain the same detergents as the Trans., because they don't need them. Sure, the small gap in the Bearings is completely different than the Bearings in an Automatic Transmission. Have you ever seen or built one to know the difference between an Engine Rod/Cam Bearings VS. an AT Trans. Bearing? The Motor Vehicle Bearing rides on a film of Motor oil and they will never touch as long as the oil pressure is present all the time. Now, the Trans. Bearings are spaced throughout the entire Unit and are designed like wheel Bearings; in that they ride on grease and the Needle Bearings spin as the Wheel rotates while in the AT. Trans. the Shaft Ends ride on ATF and the Needle Bearings spin. The Thrust Throughout the Trans. Shaft ends carry the load throughout the entire Trans. and end at the rear of the Case. From there the Thrust goes out the output Shaft to the rear of the Engine to the Thrust Bearing out front, to the Crank Shaft to Harmonic Balancer. This is why I think that my Vehicle Trans. accident that lifted the Trans. , drive train, moved forward and caused the shock wave forward and cracked the Harmonic Balancer, because there was no problem with the HB before the Trans. was lifted up, while moving forward, on a driveway made of asphalt, without pouring the proper cement first.
The Transmission fluid is developed for Trans. only and should be used for that purpose. The Factory told us to use Oil in the Motor, so that is what I do. The Trans. Mechanic that drove his Vehicle for 300,000 miles doing a test, made out well. I don't think that I would ever use his idea, I follow the factory experts all the time. As far as flushing out my Engines that I own, I can and will experiment. For the past 10 years I have been experimenting with keeping the Engine Temps. down. I had a 1981 Camaro Z-28 that I had to stop at the Bridge as a Boat went by to open the Hood to let the under-Hood Heat out. I had add-on AC on that Vehicle, I never did figure out why that was necessary, now I think that is why the factory never installed AC on it to begin with. Of course, the Car came with AC, but the factory knew what add-ons they needed to add for it to work, I didn't.
So, Trans. fluid is slippery, uses detergents and is approx. 10 Viscosity, how could ATF hurt any Motor when flushing for 1/2-hour existing debris? Compared to Amsoil, Seafoam or any bodies flush solution and their perspective ingredients that do the same for more money?