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post #1 of 19 (permalink) Old 03-29-2014, 08:12 PM Thread Starter
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Transmission and Primary Oils...

Why don't they need filters?

Overtime pays more because of what you're missing, money isn't everything.

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post #2 of 19 (permalink) Old 03-29-2014, 08:44 PM
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They are closed systems compared to the motor , the oils stay in the primary and trans compartments .. There is no contamination to filter like in the motor

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post #3 of 19 (permalink) Old 03-29-2014, 08:50 PM
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Same reason a manual trans on a car doesn't have a filter. Closed system with no outside contaminates.

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post #4 of 19 (permalink) Old 03-29-2014, 09:04 PM Thread Starter
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Fair enough, thanks fellas.

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post #5 of 19 (permalink) Old 03-30-2014, 02:34 AM Thread Starter
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OK, so just thinking about this a little more, what are the "outside contaminates" that are in the motor that need to be filtered?

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post #6 of 19 (permalink) Old 03-30-2014, 07:35 AM
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all the crap created by internal combustion doing combustion things , the oil is constantly picking up and moving minute particles of engine metals , and some of that stuff isn't caught by the filter , I have Used Oil Analysis done every oil change and it shows how much metals are still in the oil , the filter doesn't catch

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post #7 of 19 (permalink) Old 03-30-2014, 08:59 AM
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Originally Posted by The Volusianator View Post
OK, so just thinking about this a little more, what are the "outside contaminates" that are in the motor that need to be filtered?
soot from semi-burned fuel & oil, unburned fuel, Un-filtered particles of "dirty air", metal filings. those are the ones I can think of.


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post #8 of 19 (permalink) Old 03-30-2014, 09:47 AM
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Agree with the above posts, but you also need to consider that neither the trans or primary utilize a pressurized oil system that is normally associated with filtering. Small fuel burning engines such as found on lawn mowers do not use filters even though they are subject to combustion contaminates because they use a sling type oiling instead of pump style pressure.


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post #9 of 19 (permalink) Old 03-30-2014, 10:42 AM
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Fine time to bring up the point that this is why you shouldn't use engine oil, IE:the MoCo's SYN3, in transmissions and chain/clutch cases, and it has to do with detergent vs non-detergent oils.

Detergent oils: "Detergents" are chemical additives that pick up and carry foreign materials in suspension so that they can be filtered or flushed away. This is how your laundry or dish detergent works, it picks up the proteins and solids that the stains are made of, holds them in suspension and floats/carries them away with the water when it drains.
Detergent motor oils do the same thing, they pick up the foreign materials and contaminants and carry them to the filter where they get removed rather than being circulated continuously through the bearings and other tight tolerance areas of the engine. If there's no filter, it continues to carry the junk around through your motor.

Non-detergents do not have that additives that suspend and carry the contaminants. Anything produced by the engine or trans, or introduced from the outside falls out of suspension and ends up laying in the bottom of the cases. While it doesn't get filtered out, it also doesn't get continuously circulated through the gears and bearings either.

So, you decide. Most oils used in transmissions, gear cases or other non-filtered applications are non-detergent, most engine oils are heavy in detergents.

Which is the proper oil to use in your engine and which in your transmission??

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post #10 of 19 (permalink) Old 03-30-2014, 11:52 AM
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Quote:
Originally Posted by The Volusianator View Post
Why don't they need filters?
I do agree, but could be getting at the pressure plate debri and the greyish coloration of the primary oil (hydraulic), what ever happened to straining snythetic thru a loaf of freach bread? then reusing it. Just out there
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