Transmission drain plug - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 13 (permalink) Old 06-05-2019, 04:12 PM Thread Starter
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Transmission drain plug

1988 Spider Quad

So, I mangled the tranny drain plug trying to get it out. Finally got it with an extractor socket and ground it down so I could use a 3/4 wrench to put it back in. Now, it drips a little everyday and I'd like to replace but can't find anywhere. No, I did not put a new washer on. Can't even find what size it is.

Not sure why these are made of soft brass. Probably something to do with the magnet. I'm not a metallurgist, but I was wondering if brass and aluminum expand and contract at the same rate. I say this because it only leaks after a drive.

Anyway, I'd like to get a new plug if anyone knows who has these or at least knows the thread size.

Alternative is try to get old one out again and use a new washer but afraid I'll end up plug less.

KJW
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post #2 of 13 (permalink) Old 06-05-2019, 04:32 PM
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post #3 of 13 (permalink) Old 06-05-2019, 04:43 PM Thread Starter
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The link is for the differential. Think there the same?

KJW
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post #4 of 13 (permalink) Old 06-05-2019, 05:07 PM Thread Starter
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Just got an email from Jon at Alfa Parts in Berkeley, Ca. He has in stock. $22.+

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post #5 of 13 (permalink) Old 06-05-2019, 06:03 PM
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The brass will not gall in the aluminum, and when overtightened, it does what yours did rather than strip out the aluminum threads. Some later ones were steel. Not as user friendly as brass.


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post #6 of 13 (permalink) Old 06-06-2019, 04:34 AM Thread Starter
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Makes sense. I learned something today. Thanks Gordon.

KJW
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post #7 of 13 (permalink) Old 06-06-2019, 06:21 AM
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Quote:
Originally Posted by kentjw View Post
The link is for the differential. Think there the same?
They are the same.

Chris

1990 Spider Veloce
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post #8 of 13 (permalink) Old 06-06-2019, 08:07 AM
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when you order a new one ask for a new copper washer too...it won't come with it.

odd the OKP link says it fits the top of the cylinder head too..........not sure you really need a magnet there!

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post #9 of 13 (permalink) Old 06-06-2019, 08:46 AM Thread Starter
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New washer for sure! I guess they're referring to the freeze plugs...agree, strange place for a magnetic plug.

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post #10 of 13 (permalink) Old 06-07-2019, 07:56 AM
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Quote:
Originally Posted by spiderserie4 View Post
odd the OKP link says it fits the top of the cylinder head too..........not sure you really need a magnet there!
I imagine that it just happens to be what they have with the right threads and length. My parts manual shows a common part number for the drain plugs (60703262) but a different number for the head plug as you would expect.

Chris

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post #11 of 13 (permalink) Old 06-07-2019, 05:39 PM Thread Starter
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Alfa Parts thought they had tranny drain plugs but, no. Does anyone know if the oil sump plug is the same size? This is frustrating not being able to find any info on this part.

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post #12 of 13 (permalink) Old 06-09-2019, 04:28 PM
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Centerline has them I think.
Part # OP622B
https://centerlinealfa.com/sites/cen...xle/op622b.jpg
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post #13 of 13 (permalink) Old 06-09-2019, 05:29 PM Thread Starter
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Thanks Yachtman but that's not it...might fit though. Anyway, it's fixed. I drained out the Redline into a clean container so I could reuse ($$). Then I found a 22mm new copper washer at local hardware store. I filed the bolt down so a 19mm wrench would fit then put a thin coat of gasket goo on and snugged it down but not to tight. No more leaks!
So, that's it until the next issue pops up which I think is going to be new exhaust gaskets as I'm getting that ticking sound at hot idle. Been there and done that with my '74.

Thanks again.

KJW
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