Coolant Block Drain Plug - don't skip this during a coolant flush
#1
Coolant Block Drain Plug - don't skip this during a coolant flush
I'm sure plenty of people here already know this, but a surprising amount of coolant stays inside the engine after you drain the radiator. The 14mm drain plug on the center iron helps get it out.
Apologies for the sound levels, my phone has seen better days.
Apologies for the sound levels, my phone has seen better days.
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#4
RX-7 Bad Ass
iTrader: (55)
It has an aluminum crush washer. It can be re-used a number of times but it's probably good form to replace it.
Dale
Dale
#6
RX-7 Bad Ass
iTrader: (55)
Nope it's quite small. Probably 8mm ID I would guess.
Dale
Dale
#7
Racecar - Formula 2000
I've been ignoring the block drain plug (changing AF every year) for years and no issues - related post:
https://www.rx7club.com/3rd-generati.../#post12338981
https://www.rx7club.com/3rd-generati.../#post12338981
Last edited by DaveW; 04-23-19 at 04:49 PM.
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#9
Racecar - Formula 2000
By design, coolant enters and leaves the block at quite a high level, so if you only remove the radiator plug you won't drain hardly any of the coolant from the block.
Last edited by DaveW; 04-24-19 at 07:26 PM.
#10
RX-7 Bad Ass
iTrader: (55)
If you are changing coolant once a year I don't know if it's totally necessary to do the block drain every time. The big thing is I think that gets more of the junk/sediment out since a lot of it settles in the block. It is a good idea, but I wouldn't lose sleep if you haven't done it this way in the past.
Dale
Dale
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XxBoostinxX (04-26-19)
#13
RX-7 Bad Ass
iTrader: (55)
Yeah, just snug it up so you feel the crush washer taking a good seat. I would guess 20-30 ft-lbs, in that neighborhood.
Dale
Dale
#14
Senior Member
Just for posterity, it's M10*1.5 and quite short. Maybe 8mm long max. Just got a 3 year project up and running for the first time. Car has been dead since 2006 at the latest. Probably longer.
Didn't even know the drain existed until I added coolant.
Didn't even know the drain existed until I added coolant.
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DaleClark (10-02-22)
#17
I've always wondered if a block drain valve from other cars or trucks might fit.
This looks like the block drain on my daily-driver LX470, with the right size hose it was completely mess-free to drain the coolant. I haven't tried it yet, but might get one the next time I need Toyota parts.
https://absolute-wits-end.com/block-...de-14mm-plugs/
This looks like the block drain on my daily-driver LX470, with the right size hose it was completely mess-free to drain the coolant. I haven't tried it yet, but might get one the next time I need Toyota parts.
https://absolute-wits-end.com/block-...de-14mm-plugs/
#19
Boilermakers!
iTrader: (157)
I've always wondered if a block drain valve from other cars or trucks might fit.
This looks like the block drain on my daily-driver LX470, with the right size hose it was completely mess-free to drain the coolant. I haven't tried it yet, but might get one the next time I need Toyota parts.
https://absolute-wits-end.com/block-...de-14mm-plugs/
This looks like the block drain on my daily-driver LX470, with the right size hose it was completely mess-free to drain the coolant. I haven't tried it yet, but might get one the next time I need Toyota parts.
https://absolute-wits-end.com/block-...de-14mm-plugs/
#20
Moderator
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so like the oil drain plug is 9956-41-400 is an aluminum 14mm ID washer. 9956-21-000 is the turbo oil feed, copper, 10mm etc etc
Mazda has washers from i think 6mm to something like 24mm
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scotty305 (10-04-22)
#21
Senior Member
iTrader: (7)
in a part number for hardware, 9956 tells you its a washer, 4 = aluminum (2 is copper) and then 1000 = 10mm ID
so like the oil drain plug is 9956-41-400 is an aluminum 14mm ID washer. 9956-21-000 is the turbo oil feed, copper, 10mm etc etc
Mazda has washers from i think 6mm to something like 24mm
so like the oil drain plug is 9956-41-400 is an aluminum 14mm ID washer. 9956-21-000 is the turbo oil feed, copper, 10mm etc etc
Mazda has washers from i think 6mm to something like 24mm
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