What type of Locktight should I put on these bolts in the Heat Exchanger?

[Hoohaa]

Could someone please suggest the correct Locktight to put on these bolts in my new heat exchanger?

[GordMay]

I’d use Blue Loktite #242, unless WM Diesel/Kubota say otherwise.

[Hoohaa]

Was thinking it should protect the bolt against water?

[Lepke]

I usually use Loctite 51147 or Never Seez NMCBT an anti seize thread lube. Around water, heat and cast iron, getting the old nut/bolt loose is the big problem. Properly tightened nuts & bolts don't seem to vibrate loose on engines I work on.

[Hoohaa]

Thanks Gord. I used the 242 blue and it was the right stuff.