since somebody bought my first 4th cylinder coolant mod adapter, I had to make another one to test it, since I never got to install the first one.
but this time I tried out a face seal instead of the bore seal on the first one. so now the oring gets squished between the head outside surface and the adapter, instead of inside the freeze plug hole like a piston.
the oring is slightly smaller for this attempt and the gland adjusted accordingly.
sorry for no pics of the machined side of the adapter. i was in such a rush today to try this out i totally forgot to take pics.
i installed it on my 89 daytona with a generic, but correctly sized rubber oring (not viton like the first one). i filled the coolant back up, and installed plugs into the adapter and the bleeder hole on the tstat housing. so this is a test run with no hose yet..just to see if the oring seal works at all.
i let the car idle until the fan came on, and hooray no leaks!
its getting dark out so I will do more testing tomorrow. I have all my parts now (braided hose, hard tubing, an fittings galore) so if testing passes okay, I should be able to try out the whole setup.
note from the install:
-removing the bleeder plug can be difficult. mine wouldnt turn with an 8mm socketed allen bit, and ended up stripping its hex. i had to weld a piece of allen wrench into it to get it out.
-i ended up popping the freeze plug INTO the head, and then prying it out with vice grips acting as a lever and the edge of the freeze plug hole as the fulcrum. not that hard, but not exactly pretty. have yet to pull one out flawless.
-looks like the elbow that goes onto the tstat housing bleeder hole hits the valve cover when you try to install it..so you will need to take the valve cover off to do so :(. however, I found a swivel fitting that works and only raises the price about $10. its worth it IMO.
- there are some stamped numbers pretty close to the freeze plug, which would make the oring not seal if they were under it. looks like on my head they arent TOO close, but youd want to check your head for a nice surface around the freeze plug before you used this face seal version. I used a bastard file and lightly filed the area around the plug in case there were any burrs..then wiped it with acetone.
the pics are of the allen wrench i had to weld into the bleeder plug (which I replaced with a brass one with a big hex head like a nut), and the adapter itself at operating temperature (215+F)
more testing tomorrow!