I have a t04s single setup on my 3rd gen and the oil hole next to the transmission on the pasenger bottom will not seal. I have tried the non hardining,hardining silicone and gasket material and it will not seal. With the material it will seal for a few days then the oil soaks through. What have you guys used to seal this blockoff plate??

 

had no problem with either of mine the oil return one or the one thats blocked off
there must be a problem with the surfaces not being exactly flat.

 

did you buy a blockoff, i cut my stock flange off the twins and welded the hole shut, no issues here.

 

oh and i used ultra grey silicone.... you gotta let it set up for a day before you start the car or it wont work

 

Also, when you use silicone like ultra grey you need to make sure both surfaces are VERY clean with absolutly no oil residue at all. If there is any oil residue the silicone wont adhear to the surface right and it will leak.

Stephen

 

when i tried the silicone i cleaned both surfaces good(blockoff and engine) with degreaser and let it setup for 24hrs. I am thinking about J.B welding it on.

 

It really shouldn’t be that hard, what kind of gasket material are you using?
I used honda bond on most of my engine sealing components at the suggestion of Rob.
I can only guess maybe your blockoff plate could be bent or have a slight depesion in it that would let oil leak. Though it would be odd if you prepped it right and used a good sealant on top of that.
Could the leak be coming from anywhere else and it just appear to be coming from the blockoff plate? It is such a simple place to make good seal, its kinda hard to believe it could be leaking at all.
Did you make the plate or did you purchase it from somewhere?

 

it is the same plate that was on there before. i tried some thick paper gasket and it stops for a couple days, so i know that is the place of the leak. I am going to try the grey sealant again and make sure both are super clean. If this does not work then i am going with the quick weld.

 

I just used a stock gasket.

 

Stock there should have been an accordion looking oil return line that came from the stock twins. Maybe a stock mazda gasket would be the ticket as they are a rubber encapsulated crush gasket. I don’t think trying to seal it up with jb is a very good idea as it could easily pop out if the surface you are applying it to is not thoroughly cleaned and prepped for a mechanical bond. It will be oily smooth and round in the oil return so as the metal heats up and expands it could easily pop the “plug” loose and you would be much worse off than a leaky blockoff plate. I just think that maybe the material for the gasket you are using may not be sufficient for the heat that is in that area possibly. Plus it really should be easier and more dependable to just correct the leaky blockoff problem.

 

Well i dont have any of the old lines from the stock twins. Think i will go over to atkins and see if they have the stock gasket. Ill try that.