Threadlocker/sealant on lower intake manifold bolts

[glavey]

Nearly every write-up and how-to involving the bolts that secure the lower intake manifold to the heads say to use a thread locker, typically blue loctite, on the bolts. According to Permatex's technical data sheet on their blue threadlocker, it withstands temperatures up to 300F. That seems a little close to the operating temperatures of an engine.

Will blue loctite hold those bolts good enough or should I use something else? I found some loctite 246 on amazon, but I have a hard time believing that with the increased temperature resistance, the bolts will still be able to be removed with hand tools if the need arises.

 

[Mad_Coachman]

You only need thread sealant on the bolts that go through a coolant passage. 😉

 

[glavey]

Which, if any, of the lower intake (or upper intake) bolts go through a coolant passage?

 

[Mad_Coachman]

Only on the lower. You'll know when you pull them out if the lower hasn't been done before. When I did my water pump only some of the bolts had thread sealer....same goes for the lower intake.

 

[2000ltd]

So just thread sealer not both?

 

[BuickGirlFromMars]

So just thread sealer not both?

I would use a high temp thread sealer. Part of the reason is to prevent corrosion into the engine and other is to help lock the fasteners

 

[2000ltd]

I would use a high temp thread sealer. Part of the reason is to prevent corrosion into the engine and other is to help lock the fasteners

I have this

 

[02LTD2.0]

Should be okay.