!!!!!!!!!!!!!!!!Overheating!!!!!!!!!!!!!!!!!!

[Grizzly]

Did you change the water pipes that go to the Throttle body? Was there any steam etc coming from that area?

The Vac pipe take off\'s i usaly fill the end with 2 pack glue (it does\'nt blow off like the Rubber Blanking Nipples. (there a bit of a Waist of time and need to be Super glued on realy)

That stuff you found in the Spring looks very much like Mazda RTV sealer (simalar colour).

[Rixio]

Nop no steam that i could see, just the sound...RTV Sealer?

[nikp]

RTV Sealer?

Yeah, it\'s a type of silicone sealant, used on an engine rebuild for parts of the rotor housings and on the gearbox, and probably other places too. Used instead of a sump gasket too.

[Grizzly]

LOL, As well as a sump gasket

Thing is if RTV is over applied it will squash out into the oil/water ways (what ever its being used to seal) and if it brakes off will float around until its picked up by a Filter or in this case the Thermostat Spring. Not really a Big problem just means some one has been Generous with the sealer.

[Jonathan_F]

Takes around 20 mins to start leaking but itl start at 80\'c now...before i replaced all the pipes and hoses it took up to 2 hours...its very irratic and not consistant to any specific length of time or temp...very strange...

I tested the old and new thermostat and the new one actually opens later & less compared to the old one! Replaced it again with no joy...changed caps again with no joy...

I went to tesco just now, to put some fuel in it as it was almost out and by the time i got back and parked it it was maybe 6 mins? Left it 2 mins then it started leaking...it was also making a very strange hissing noise from around the plenum area which i tried to locate but couldnt because it was dying away slowly...hissing kind of bubbling...

I took a pic a while back of the original thermostat when i pulled it out of the car...it has some sort of silicon or elastic something stuck in the spring...

Also...where can i get some of these nipples from?

There are two vacuum tanks near the plenum. The hissing sounds like a small leak from one of the pipes to and from these tanks.

Good luck finding which one!!

[Grizzly]

Thats a good point arn\'t you having Boost problems too?

[nikp]

LOL, As well as a sump gasket

Not at all, in my case, and many others, instead of a sump gasket.

[Grizzly]

You mean everyone that uses Bruce T\'s rebuild Kits If you use OE they come with the Kit.

[nikp]

No, i didn\'t use Bruce T kit - I got mine from Tim at RX motors, and he doesn\'t use a sump gasket either.

[Grizzly]

No? So does he not use OE Gasket Kits then? Thats a Bit confusing? I was led to belive with Tin Sumps you need a Gasket as they are never properly flat.

I think its Personal Preference, If Mazda Use them In OE Kits and my car never leaked in its Ten years on the road then I\'ll be sticking to RTV and a gasket

Did you not get a Gasket or where you told not to use one?

[M@r]{]

Rixio, I havent read all through this thread, just a few of the last posts.  But it sounds like you have exactly the same problem I had with mine a few months back.  Turn the car off, few minutes later water starts coming out of the expansion tank.  It seemed to happen to me the most when heatsoak was pushing the water temp up after switching off.  Anyway, a new AST cap sorted the problem  (WGT diagosed it)

[Rixio]

Nop boost was sorted out a while back...i just broke one of the solenoid spigots to the "Double Throttle Control" its disconnected from the Plenum now...So seem to lose some boost in 1st at top revs...but other than that its fine

Going to the builders in a couple of weeks will see what happens there...if it does need another rebuild he said he\'d do it if its not a cracked housing or something that he doesnt cover under warranty. If its the seal then "It wont be a problem" so looks promising atm

[Martiny]

my car does the same thing with the coolant, although intermittently. I have replaced the cap and its a little better.

What I want to try next is replace the AST with a standard Mazda one and see.

I believe the aftermarket ASTs dont always have a good seat for the cap.

[ro284]

What rating is the cap on your AST Rixio, Martiny? the one i have on mine is marked LBS 1.3 which came with the alloy AST, i think the standard one is 0.9,(not 100% on that) i wonder if the 1.3  would help eliminate these problems or cause another problem in the system somewhere else! but iv\'e had no problems at all with it,
Bob

[Rixio]

Martin. With the Pettit one it still overheated it just took a little longer to do so. I dont have a spare stock one to try otherwise i would try it...
Bob the stock pressure caps are both 0.9 bar...
Mark all the caps have been changed 3 times each...