Keeping your hot nuts tight

[davedave]

Well I visited Coventry fastners @ Artarmon and they were more than happy to help and also suggested the cone lock nuts (but called them something else).

The thread slightly changes in the last couple of threads causing them to exert constant friction.

Anyways, I've installed them and in the couple of hundred kays I've done since last week, they've stayed perfectly tight and my engine sound better (quieter) and boosts stronger than it ever has. They must have come loose pretty close to the start of getting it on the road. Wish I had used them from the start, I probably would have passed my engineers noise test first time.

Anyways, thanks to all that helped!

[o_man_ra23]

Whenever putting nuts anywhere near the exhaust, you should always use brass nuts(see tips and tricks thread). On the 22RE at least, toyota used nuts which had slots in the top, and were then pressed inward slightly on the top thread or 2. These work a charm and seem to be multiple use.

Cheers, Owen

[1JZ-Rolla]

so these cone lock nuts, do they damage the threads on removal, or is it just the nuts themselves that become throw-aways?

[o_man_ra23]

They do no damage to the thread whatsover. In fact, i find they are re-useable a couple of times... but maybe thats uni student cheap.

Cheers, Owen

[EldarO]

Is this application not suited to lock-washers?

i find they work well in every other high-vibration environment :/

Eldar.O.

[o_man_ra23]

by lock washers do you mean spring loaded washers, or star washers(like the ones on ya steerin wheel). If you mean spring washers, its already been stated that they work. If ya mean star washers, you may need to test their resilience to heat.

Cheers, Owen

[takai]

Spring washers, or split washers however have a tendency to break at high torque yields. So if you are doing up your manifold quite tightly then I would not reccomend them. I found this out the hard way when doing up the bolts on my pressure plate and thought that new bolts with spring washers woudl be a good idea.

[limbo]

try using gasket glue instead of loctite it works for me just as well. You use what you got. The gasket glue i had lying around was for engine gaskets so i assume it will survive the heat and keep from coming loose