Need some help!

[BD240sx]

Ok I have a 94 240sx se, so i have had this problem for a little while now. 1st off it was a freeze plug that had a hole in it. Ok, well I just went ahead and got some sealant and it seem to solve my problem. Its been fine up until a couple of days ago and it basically blew the seal on freeze plug, and I lost my coolant and whatnot. So I take it to the mechanic and he tells me there is big hole in freeze plug and I get it fixed. Then I leave and it overheats quickly when I leave, bring it back and another freeze plug had holes in it as well. So i get it fixed it starts heating up a little by the time i got home, I open up bleeder screw and run it for about 20 minutes and it drops down to normal running temp. Ok, so next day I go to work, its fine, I go to the bank its fine, and then I start going to the store and by the time I get there its starting to heat up again. I get out check fluid and its low. I go into store get coolant fill it up and it basically coming right out of the bottom. Take it back(had it towed) to mechanic and he said it blew out the freeze plug they replaced and he would go ahead and put another one in and see if he can get it a little farther in. He also told me he thinks there might be another problem that is causing this. Blow by or pressure building up causing this. So he replaced it and they bled it, test drove it and got about a mile before it blew out again. He then basically told me he is not sure what is wrong with it and they can't just keep replacing that freeze plug cuz its just going to come out again. My question is what other factors could be leading to this problem. He did tell me there seems to be alot of calcium build up in the radiator, could this be a problem? Any ideas?

[BD240sx]

Bump!

[480sx]

Bleeding the air out of the coolant system on a ka24 can be a PITA. If you dont do it right you can have overheating problems. Search this site the info on how to do it right is somewhere.

[BD240sx]

Well yeah, that would explain an overheating problem, but not the blowing out of the freezeplug.

[vancouverbc]

zer...age=1

the above thread has the exact same problem as you.

Out of curiosity, what did you pay to replace freeze plug? One of mine is leaking. What size and type of freeze plug did you use? did mechanic take off exhaust manifold? what was location of freeze plugs? i would get some rubber ones for emergencies.

zerothread/294409
Modified by vancouverbc at 9:08 PM 11/25/2007

[BD240sx]

They were steel plugs I believe. They were on the passenger side. Just to refresh. I am not having a leak problem, it is completely shooting the plug out of the block.

[BD240sx]

He charged me 54 bucks for the install.

[vancouverbc]

T

They were steel plugs I believe. They were on the passenger side. Just to refresh. I am not having a leak problem, it is completely shooting the plug out of the block.

Mine are driver side. The guy in the linked thread is popping his plugs like you and trying to find out where the high pressure is coming from.

[BD240sx]

Oh ok.

[311 RB26DETT]

yeah that um... shouldnt be happening. freeze plugs are usually pretty good in there. you mechanic might be doing something wrong. i would try tapping the sides of the freeze plug with a punch to put some more pressure between the 2...