ive never used hylomar.

mazda used to have metal water seal protectors, i think in the late 70's



mike

If you use the teflon seals, hylomar does NOT hold them in place, you have to use vaseline. I learnt this doing my rebuild.

I have both. I hate the sticky mess that Hylomar leaves behind, but I also don't like the fact that Vaseline makes the outer coolant seal (black colored one) stretch. Since I always use new engine gaskets for all my rebuilds, and my engines last quite some time, I use the petroleum jelly. On the race engines I use the Hylomar. Sometimes race engines popped before you expect it and Coolant seals are still fresh and re-usable..Hylomar is a mess I hate it..

you've prolly tried this, but have you tried something else on the outer water seal? like a dab of silicon to hold it in place?



mike

i like hylomar, i think mostly for the name https://www.nopistons.com/forums/pub...IR#>/bigok.gif

Yes Mike. Works great But I noticed the silicon expand and creep between the rotor housing and side housing every time the engine was heated pretty good (leaned a little for power) https://www.nopistons.com/forums/pub...#>/biggrin.png I kept peeling the silicon strips out the edge of the rotor housings but more kept popping out and growing like a Chia Pet..

In the past I have always used Hylomar on the inners and an extremely thin coat of grey silicone on the outers. I have never had a problem with the outer seals doing it that way.



But, I think this time I am going to try the vaseline on both. Here's a question - when you use vaseline on the outer do you leave it off near the areas where you pick up with silicone beacaust there is no gasket?

yup, you dont need the vaseline all the way around, just enough to hold the seal in



mike

True story I swear... One time I ran out of Vaseline and had some Vicks menthal rub laying around and I used the VICKS Menthol jelly. When the engine fired up, it smelled like the engine had a cold. Vicks smell everywhere when it melted.. https://www.nopistons.com/forums/pub...#>/biggrin.png

haha, thats great https://www.nopistons.com/forums/pub...IR#>/bigok.gif



mike