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Old 06-09-2023, 07:17   #1
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MD2020 Coolant Drain Plug Drip

Having recently changed the coolant on my MD2020, there's a slight weep of coolant from the drain plug.

This is of the type where there's a body that screws into the engine block, and then a threaded plug with a 'T' shaped handle on the end. There's a small spout to which a hose can be connected to drain off coolant without making a mess.

I just keep getting a small amount of coolant out of the spout - it's not leaking between the housing and the block, which suggests to me a problem with the seal made by the screw in plug.

Any thoughts on how to fix this appreciated. I can't find the part number for this - I'd be happy to replace it.
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Old 06-09-2023, 19:41   #2
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Re: MD2020 Coolant Drain Plug Drip

It only has a contact seat that seals the coolant and not much can go wrong with that. Try tightening it a little more or perhaps screw it out of the fitting and clean the seat. The part number is 966871
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Old 07-09-2023, 09:01   #3
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Re: MD2020 Coolant Drain Plug Drip

Thanks for the reply, skipperpete

I've tried slackening it off and re-tightening but that's not worked.

It's now apparent that it only weeps when the engine is running so possibly heat / pressure related. I think I'll need to try taking the plug out fully and checking for any damage.

Curiously, the drain plug doesn't look like the replacement part in the photo.
I've included a photo of the existing drain tap. The current one has a spout whereas the replacement part would appear not to have this. I wonder why the design was changed?
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Old 21-05-2024, 14:22   #4
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Re: MD2020 Coolant Drain Plug Drip

I got part number 966871 to replace the existing drain tap and the thread for the engine block is completely different!

I think the thread on the original might be 1/4" BSPT (taper) ???

No idea what the thread is on part 966871 but it's clearly smaller.

Does anyone know the correct part number, or whether some sort of adaptor is needed for 966871?

Currently trying to clean the old drain tap to see if I can get a decent seal.
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Old 22-05-2024, 02:36   #5
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Re: MD2020 Coolant Drain Plug Drip

To answer my own question, I believe that the correct part is VOLVO PENTA FAUCET 861824
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