When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Thinking of drilling into the driver's side manifold near the outlet. I got the manifold off, so I can drill it on my drill press. Any tips, tricks, links are appreciated.
I am a newbie to this engine, I was surprised there were no gaskets. I would like to hear people's thoughts going back together: gasket or no gasket. While I am at it, I am taking off the pass side, bead blasting and spraying them.
Also a good thing because I just put injectors on and after I cycled the motor, the manifold was full of diesel/oil. Worth the effort (note: this is a van and the body is off so the work is easy!)
I will say it's NPT threads, so don't bury the tap in the manifold like you would using a bolt tap. Run the tap in about 1/4 then test the fit, work the tap in a thread at a time or the tapered threads will be too large to seal if you run the tap all the way in
Regarding the gaskets, when I had mine off years ago, I put the driver's side on with a Felpro gasket, and the passenger's side on without one. Still no leaks on either side, but the visible part of the gasket is in rough shape. if you have them machined flat, I'd skip the gasket.
So you are going to paint the manifolds? Got something that can take the heat?
Below is a PDF with info on EGT probe install. Removing the manifold is not really necessary.
All duly noted on the drilling and tapping and thank you. I have some high temp ceramic spray paint that claims 1400-2000 degrees. I was going to bead blast them and check for straightness + replace the bolts. I know it wasn't necessary but the engine is easy to work on right now. After just putting injectors in, the manifold was full oily fuel so I didn't want to add some metal flakes to that and run it through my new turbo.
Sorry I am not seeing the PDF, can you direct me to it?
I'm definitely no pro at that kind of stuff but I did it with the manifold on the truck. I believe I drilled a pilot hole with a smaller bit and then drilled the proper sized one with the kit from Riffraff. Cant remember what size but the instructions will say. I only remember having to run the tap in about half way after pulling it out and checking a couple times until I could get the sensor to seat down flush against the outside of the manifold. Doing it on a bench should be even easier as long as you mark your spot good.
I think the consensus is the high temp black holds up the best. I did my turbine housing in the high temp silver and it looked cool for about a year then started flaking off. I don't think there is any coating or paint that will last forever on a surface that heat cycles that hot. Even the high dollar Jet Hot or Swain ceramic coats eventually flake off.
I would recommend mocking up the manifold on the head to get the proper location for drilling.
Gaskets… some like them, some don’t. I used gaskets to seal both side since they were slightly warped and leaking. It has worked well for years. If no leaks or warpage then should be fine without the gaskets. If you do use gaskets I recommend retorquing after warm. At least that’s how I did mine.