Opinions Please: Rotor housing coolant seal pitting
03-12-13, 11:03 AM
#2
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I have good luck on using JBweld for aluminum pitting. GM V6's have huge prolems with pitting like that on lower intakes, I try to use a wire brush to get all of the crap out of the pits but do not make them smooth. I use normal JB, not JB quick. Once you lay it in and let it dry just sand it to make a clean surface. Not sure if this works on housing but same idea, aluminum mating to cast.
03-12-13, 11:36 AM
#3
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a little silicon would work too
03-12-13, 12:06 PM
#5
if the pits are deep i mix up some JB weld, dab it on, let it set up for about 3-4 minutes before it sets then run over it with a razor blade then block sand the area.
if the pitting is severe enough it will wear the coolant seals as they expand and contract. the pictures are a little hard to tell but the outer area is less critical than the inner coolant seal surfaces.
i do use high temp silicone on the inner surfaces but it still won't account for larger pits in the surface, it's mainly a sealing aid because but it will squeeze out during assembly..
if the pitting is severe enough it will wear the coolant seals as they expand and contract. the pictures are a little hard to tell but the outer area is less critical than the inner coolant seal surfaces.
i do use high temp silicone on the inner surfaces but it still won't account for larger pits in the surface, it's mainly a sealing aid because but it will squeeze out during assembly..
Last edited by RotaryEvolution; 03-12-13 at 12:08 PM.
03-13-13, 07:15 PM
#6
if the pits are deep i mix up some JB weld, dab it on, let it set up for about 3-4 minutes before it sets then run over it with a razor blade then block sand the area.
if the pitting is severe enough it will wear the coolant seals as they expand and contract. the pictures are a little hard to tell but the outer area is less critical than the inner coolant seal surfaces.
i do use high temp silicone on the inner surfaces but it still won't account for larger pits in the surface, it's mainly a sealing aid because but it will squeeze out during assembly..
if the pitting is severe enough it will wear the coolant seals as they expand and contract. the pictures are a little hard to tell but the outer area is less critical than the inner coolant seal surfaces.
i do use high temp silicone on the inner surfaces but it still won't account for larger pits in the surface, it's mainly a sealing aid because but it will squeeze out during assembly..
Is everyone thinking spread a thin layer of RTV on the rotor housing's mating surface? I've done a little research and read about people doing that and also spreading a little bit of hylomar on the housing's mating surface.
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03-14-13, 02:00 PM
#10
i would put sealant over the sealing surfaces for the whole housing, since you're going to use it you should probably not just do a small area. squeeze a little on a fingertip and smear it over the surface lightly, try not to get any too close to the inside of the engine otherwise you may have some difficulty starting the engine with all the silicone debris floating around when you first crank it.
03-17-13, 02:37 PM
#11
I cleaned up the pitting better. I got all the loose debris out as I could. Assembly got delayed by a single lost corner apex seal. While waiting for shipping to arrive I decided to get some macro pics to see if better pics changed opinions on whether I should simply assemble it, apply some RTV, or JB Weld.
The black in the middle hole I couldn't pick out.
The black in the middle hole I couldn't pick out.
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