Getting the rear coolant drainage plug out of the 24V engine - Alfa Romeo Bulletin Board & Forums

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post #1 of 5 (permalink) Old 03-09-2017, 05:49 PM Thread Starter
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Getting the rear coolant drainage plug out of the 24V engine

I thought some of you might be interested, removing the "hidden" rear coolant drainage plug from the 24V engine block is possible.
This is the plug located right next to the oil filter. I managed to locate it with a mirror, I was then able to reach it reasonably easily with my finger tips. A regular 22mm socket wouldn't fit, it's blocked by components around the plug. So... I cut down a regular 22mm socket so it was exactly the same depth as the coolant plug (using the front plug as a guide). I then had a friendly mechanic weld a cut down 1/4" socket into the original 22mm socket to convert it from 1/2" to 1/4". The new socket fits perfectly over the rear plug and with a 1/4" extension there is enough length to attach a ratchet. I broke the first 1/4 ratchet I tried, but with a 1/4" to 3/8" adapter it worked and the plug came out!

Not surprisingly no coolant followed, it was completely silted up. Even a small screwdriver couldn't get it flowing. In the end a bottle brush down the hole dislodged enough for it to drain completely.

Replacing the plug was easier than expected.

Not a simple job by any means, but it is possible!
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post #2 of 5 (permalink) Old 03-10-2017, 04:58 AM
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Nice tool you made for removing rear coolant drain plug on 24v engine.

I have been able to remove front and rear drain plugs on a 12v engine using 3/8" drive 7/8" socket set up but rear not hidden like 24v.

Ciao, Alfisto Steve
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post #3 of 5 (permalink) Old 03-10-2017, 05:07 AM
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Nice....Why did you need to remove the plug?
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post #4 of 5 (permalink) Old 03-10-2017, 10:54 AM
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Originally Posted by DanNZ View Post
Not surprisingly no coolant followed, it was completely silted up. Even a small screwdriver couldn't get it flowing. In the end a bottle brush down the hole dislodged enough for it to drain completely.
Richard, maybe wanted to have the engine coolant moving even in that part of the engine and change all coolant as well...

Cheers,

Robert

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post #5 of 5 (permalink) Old 03-10-2017, 10:59 AM Thread Starter
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I figured if I was going to do a coolant flush I was going to do it properly. There was 24 years worth of sediment in there!


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