flushing coolant system help

[trotter]

another quick point to make, the FD has two coolant drain points. One is on the bottom of the radiatior, the other is on the bottom of the block itself (kinda near the oil sump drain).

If you have a load of minging coolant trapped there you will keep seeing the dirty colour until it\'s diluted enough.

HTH

graeme

[Simaroon]

thanks for the latest 3 replies, i have searched a lot, and spent hours looking around the forum, its not just a lazy \'how to\' thread. its what i cant find answers for.
ill try the bottle technique now, altho i think a lot of air is out at the moment.
 
i think i may have to drain it again tho has i used de-ionised water not distilled. from what i have found thru searches on here, distilled should be used.
 
another thing was that the water drained was very gunky, i put a hose in the filler cap to flush thru and it worked lovely and ended up with clear water coming from the rad, how can i flush the block tho, no water was coming from there when i had the hose in, only from the rad. when i plugged the rad back up, it just spille dover where i was filling it, i couldnt get it to flush thru the block. any input into this.

[Bobbit]

Is this for an FD?

[Simaroon]

Is this for an FD?

yes it is....

[Bobbit]

Coolio, My advice when doing the coolant (which i\'m doing again this weekend) is to drain and flush like you have, then using de-ionised water (it\'s been cleaned so i\'m happy) to fill through the middle cap till it\'s full.
But it\'s not full yet, look down from the fill point towards the front of the car to the left slightly and you\'ll see a large softish pipe leading to the rad, give it a squeeze with the cap still off and you\'ll get bubble rising up if you look into the hole, then the level will drop further down than before, repeat untill the water level drops a few inches and then top up with coolant, repeat this process until the level does not drop and you are not getting any more bubbles. Drive the car for a few days, then check the levels and top up using the same method, repeat until you are happy.

[Bobbit]

Forgot to mention there is a drain point on the engine block, if you go underneath the car and on the drivers side you can just make it out, i\'ll have a dig and see if I can find any pics for you

[Simaroon]

thats more or less exactly how i have done it mate.
how do you flush the block tho, i know there must still be crap in there, (just by how filthy the rad was), how do you go about flushing the block?

[PDale]

Here you go bud  http://www.rx7.org/Robinette/flush.htm

Drain bolt is on passenger side just above the oil sump directly in line with the dipstick tube. There is a tapped hole to the right of it with nothing in. It is only a smallish bolt head, something like 12mm. Crush washer should be ok to re-use.

De-ionised water is good to use, it has all the impurities removed from it so it wont attack the aluminium.

To flush the block, your best bet is to drain the radiator and block, put hoses back on and bolt back in block. Fill system with regular water from hose (wont do any damage as you will be emptying it in no time) Run car up to temp for 5-10 mins, let it cool down and drain system. Keep doing this until it runs clear from the block. The heat of the water should clean out your radiator even more as well.


The bottle technique works, but I personally find it a ballache waiting for the system to cool down so the water goes back down out of the bottle. I prefer the throttle body hose technique myself but everyone has their own preferences.

[Simaroon]

thanks mate, i have already drained the block so know where that is thanks.
 
i should have checked how to flush it properly before filling it with coolant really, thats a waste now. will drain it tomorrow again tho and do as you just suggested with starting the engine and letting the water circulate, i should have thought of that really.
i will also check out that link now. thanks again,