Thread: How to stop v8 thermostat housing from leaking?

Originally Posted by discomuzz

Sounds interesting.

Can you please give me a little more info. on this? I'm a jaded old man when it comes to sealants and stuff. Tried heaps, don't understand why we can't just have one product that does it all (viagara for example).

Aviation Hylomar is a blue non hardening sealant that was designed by Rolls Royce originally for use in their turbines.
The range they have now is quite extensive and is used and specified by Landrover for a variety of sealing jobs.
Take a look at the website.

Hylomar

Where can you buy this hylomar blue?

Is it something you can pick up at the local Sprints/Autobarn. I followed the distributors list on the Hylomar website and there is only one Australian company listed.



Cheers,
Harvs.

Yes, you can get it from a number of auto parts stores. I think I last got it from Auto One

When re-surfacing a casting like the thermostat housing, use the wet & dry paper as described earlier (start with 240 grit or even 180 if it's badly out of true and work your way up to 320 or 400 as it gets flatter) on a nice piece of 6mm glass preferably with the edges bevelled so you can't slice your hand open, and use a circular motion being careful to apply pressure evenly over the casting and not to rock it at all.

The tip is to use kerosene rather than water. It seems to wet the paper better and the aluminium swarf is less likely to clog the paper - you'll get a much better finish.