Drain Plug on Block

krispoulin · Post by **krispoulin** » Sat Apr 18, 2020 6:12 pm

The coolant drain plug on the block (below carbs, just above starter) is weeping coolant. It's coming from the actual nozzle/drain, not from where it threads into the block. Is there an easy replacement for these?

Coolant has been drained, since I'm working on the water pump, so now's a good time.

I'm not having much luck finding info on this part.

Nissanman · Post by **Nissanman** » Sat Apr 18, 2020 8:14 pm

If you are not wanting to retain the OEM tap, you could replace it with a BSP threaded brass plug

Post by **spl310** » Sat Apr 18, 2020 9:21 pm

Later cars used a plug instead of a valve.

Post by **C.Costine** » Sun Apr 19, 2020 7:18 am

I know that it is difficult to get at but if you can get a screwdriver onto it to turn it it should seal up again. IIRC there is a tension spring on them so it should clean and tighten itself.

redroadster · Post by **redroadster** » Sun Apr 19, 2020 8:24 am

Yes when theyget some age its best to lesve alone.

Lexus 450 lx has brass drain plugs maybe some others , I believe are 1/4 pipe tread
Likely what yours are

jhayden · Post by **jhayden** » Sun Apr 19, 2020 10:55 am

C.Costine wrote: ↑Sun Apr 19, 2020 7:18 am I know that it is difficult to get at but if you can get a screwdriver onto it to turn it it should seal up again. IIRC there is a tension spring on them so it should clean and tighten itself.

Good advice, and in case it doesn't seal up:

https://www.ebay.com/itm/67-5-Datsun-Ro ... SwQNNem9sN

krispoulin · Post by **krispoulin** » Sun Apr 19, 2020 12:20 pm

C.Costine wrote: ↑Sun Apr 19, 2020 7:18 am I know that it is difficult to get at but if you can get a screwdriver onto it to turn it it should seal up again. IIRC there is a tension spring on them so it should clean and tighten itself.

I have the carbs off right now, so getting at it to turn it wasn't too much of a pain. I found what is clearly the Open position and assume that 180Â° from that is fully Closed. Is that right? If so, I'm still getting weeping at that Closed position.

If I decide to just replace it with a brass plug, would that just be something I could get at my local plumbing supply? Anything particular or special about it or just standard brass plug?

Thanks everyone for the helpful info.

Post by **Linda** » Sun Apr 19, 2020 3:49 pm

Did you try spraying it with PB Blaster or similar in case a piece of rust got in there or something? Then maybe a slight tap tap.
I would try that.
Linda

dynaguy · Post by **dynaguy** » Wed May 20, 2020 6:32 pm

Nissanman wrote: ↑Sat Apr 18, 2020 8:14 pm If you are not wanting to retain the OEM tap, you could replace it with a BSP threaded brass plug

I'm at that stage on my '66 r16 build. It appears to BSP thread.

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Drain Plug on Block

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