Paul,
Sorry for the previous email misfire.  I'm still learning how to use this iPhone.

I've been making steady progress on my 20B rebuild.  Rotors are all rebuilt with all new parts except rotor bearings which were in great shape.  Should receive my 3 new aluminum side housings from Racing Beat on Wednesday.  BTW, Jim Tanner and Jim Mederer at Racing Beat have been a pleasure to work with.......always willing to answer questions without trying to make a newby like me feel stupid.  Anyway, I'm ready to do final P-Port Housing prep work while waiting on the new AL side housings and was wondering if you can confirm the steps, as I believe there has been some changes recommended and I want to get it right on the first pass.

This is what I planned to do:
1)  Grind down and chamfer the weld
2)  Drill and tap sealing block retaining bolt holes in the housing.
3)  Clean and etch housing under sealing block and inside water jacket and build up machined area under sealing blocks with JB Weld.
4)  Seal around tubes on the inside of the water jackets with low viscosity conformal silicone.
5)  Mount sealing blocks over a layer of RTV and seal the bolt thread with something. What do you recommend for this?
6)  Pressure test

Is there anything else I've left out?

Don Mitchell

1. go easy on the chamfer as all you are looking for is flush. 2. correct.
3. correct put plastic under the sealing block so the JB Weld does not adhere to the sealing block. Just to the rotor housing. 4. correct belt and suspenders for the welded in SS tube end. 5. Correct. Use a bit of RTV or the conformal coating on the threads. 6. Correct.

Nothing I can think of at the moment. The whole idea here is to be able to correct coolant leaks, if any, without disassembling the entire engine.

Paul Lamar
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Paul,
A source for the MG Chemicals "conformal sealing silicone' pictured?
McMaster Carr or ? Haven't seen that around here. Marc Wiese

Most electronic stores sell it.
Try DigiKey or Mouser.

Paul Lamar

Also don't forget to clean and Clean etch inside housing around tubes to ensure good adhesion inside the water jacket area... Of course that is "After" you take the area down to bare material.

Mike C.

That assume you are going to pot it with Devcon but that is no
longer necessary.

Paul Lamar