562 case bolts backing out?

[Okie294life]

I’m working on a 562xp which has quit running went to pull it apart and the cylinder head bolts had backed out. I’ve been told this is a common issue, any of you fine folks know about this one, and what the permanent fix is? It’s a good thing this thing has autotune because it looks like that helped save the cylinder and piston. If I can get the head back on solid this thing will be a screamer.

 

[Chevboy0167]

I suggest blue thread locking compound. Available at any parts or hardware store.

 

[Okie294life]

I was thinking that myself, considering new bolts also, any chance these could have stretched, or something else wacky possibly is going on?

 

[cookies]

I was thinking that myself, considering new bolts also, any chance these could have stretched, or something else wacky possibly is going on?

loctite #222 is the medium strength high heat version
Clean and dry the bolts, if possible torque to spec. This should more than double the required force to come loose and prevent back outs.

 

[Chevboy0167]

^^^You sure aboot that.....

https://www.henkel-adhesives.com/us/en/product/threadlockers/loctite_2220.html
https://datasheets.tdx.henkel.com/LOCTITE-222-en_GL.pdf

 

[cookies]

^^^You sure aboot that.....

https://www.henkel-adhesives.com/us/en/product/threadlockers/loctite_2220.html
https://datasheets.tdx.henkel.com/LOCTITE-222-en_GL.pdf

m4 and m5 being smaller need a weaker formula to be rated as medium/removeable
here is the back of the packaging
https://prnt.sc/JsPYupzeKVyn