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lach

Transmissio Drain and Fill plug...are they one in the same??

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I am wanting to change my trans fluid, and when I get under the car I see the 17mm fill plug half way up the trans (looks like a tough one to get to!) but do not see a drain plug.

Do you use the same plug to drain and fill?

IF so, how do you get ALL of the old fluid out??

Thank you in advance!

lach

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Thanks...I will look again for the drain plug.

Can you give me a general location?

lach

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If you have an early car, the drain and/or fill may be a 17mm hex-head (normal) bolt. Sometime in production, they shifted to 17mm socket-head plugs. I think my original 4-speed (car mfg. 11/30/1970) had both as hex-head, but others have reported the socket-head on '02 4-speeds. It's possible the change happened with the switch from Porsche to Borg-Warner synchros at about the Modell-71 switch in the spring of 1971. My 1981 320i 5-speed has the socket-head plugs.

BTW, I remember the size as 17mm, but it may be a different size. Others can confirm.

-Dave

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A word of caution...do not remove the drain plug until after you have made sure you can remove the fill plug.

Earl

74 02Lux

02 M Roadster

72 Volvo 1800ES

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This is a good point about making sure you can remove the fill plug. I found my big allen wrench would not quite turn the corner to get into the plug - it hit the transmission tunnel. Bang in the tunnel -- or - I cut off about a 2 inch piece off the long end of the allen and that peice would fit the fill plug and I could turn it with a 17 mm open end wrench. Could be a problem it you drain the oil and then need your ride to go get the needed tool.

Pete

68 1600

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Harbor freight has an allen plug set for 3/8 socket drive, though it still wouldn't quite fit with ratchet, so I used a box end around the 17 mm allensocket and pulled for all I was worth. tight was reasonable but this was to the extreme I think.

Good idea, don't drain till filler is opened, I learned the wrong way but I think I learned.

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