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Get off my lawn!
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915 transmission drain plugs
I have owned my 911 for 24 years, but my first Porsche was a 1974 914 2.0 that I bought new.
The 901 transmission is much like a 915, and the differences are irrelevant for this post. Way back when I first changed the transmission oil in my 914 I wondered why Porsche only put the magnet in the drain plug. I ended up ordering a drain plug to use as a fill plug. They are cheap, and any metal bits I can trap and get away from the bearings and expensive bits seems like a good thing to me.  I just finished up a transmission oil change. The top plug is my fill plug, and the bottom is of course the drain plug. If I had a normal plug in the fill, I would not have caught the crud on the magnet. These are the plugs as they looked when removed from my transmission.  The "stuff" on the fill plug is different than the metal pieces on the drain plug. The drain plug had the typical small metal pieces and are very difficult to clean off of the magnet. It takes lots of brake cleaner, compressed air and wiping to get that plug free of metal pieces. The second picture is the fill plug, and the gunk just wipes off easily. It is obvious that is has a metal component or it would not be stuck to the magnet. The gears and especially the differential, slosh the oil right to the area where the fill plug is. It is hard to describe the difference but the "stuff" on the fill plug was almost a paste. It has no sharp pieces of steel, just a paste like polishing compound. The stuff for sure I don't want in the oil to be run through the moving parts. Bottom line, I would recommend you order a magnetic drain plug and replace the fill plug in your transmission. It is a inexpensive item, super easy to do, and it does keep bad pookie out of the oil. (yep, bad pookie is the technical term for it)  As an aside, I do autocross my car, and I drive it. This was the result of about 15,000 miles of use, and I don't drive it nice and easy, it get driven as it was designed to be used.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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08-23-2019, 09:42 AM
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Get off my lawn!
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Dang it, I meant this for the tech site. Eric, please move it when you get a chance.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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08-23-2019, 09:45 AM
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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,717
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Quote:
BTW, good idea. If there's room, someone should make a DP with an extended magnet and also replace the weak unit with a rare earth. One or the other. |
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08-23-2019, 09:52 AM
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unindicted co-conspirator
Join Date: Jul 2007
Location: Fresno, CA
Posts: 1,660
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so was that crud on the fill plug floating in the diff oil?
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'03 996 - sport exhaust, sport seats, M030 sport suspension, stability control, IMS Solution ‘86 928S3 - barn find project car |
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08-23-2019, 10:08 AM
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Too big to fail
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Quote:
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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08-23-2019, 10:23 AM
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Get off my lawn!
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Quote:
The oil I drained out looked clean. But my drain pan is usually a bit dirty, and I can't care less out some grit in oil to go to recycle. That fill plug just caught that much gunk. I want to think, that is all of the gunk that was in the oil.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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08-23-2019, 10:49 AM
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Carrera
