Are you using Loctite Pipe Sealant with Teflon #592?

From a mercruiser service manual!
Fuel Supply Connections,
Apply #592 Loctite Pipe Sealant with Teflon to
threads of brass fitting or plug. DO NOT USE
TEFLON TAPE.
• Thread brass fitting or plug into fuel pump or
fuel filter base until finger tight.
• Tighten fitting or plug an additional 1-3/4 to
2-1/4 turns using a wrench. DO NOT
OVER-TIGHTEN.
• Install fuel line. To prevent over-tightening,
hold brass fitting with suitable wrench and
tighten fuel line connectors securely.
• Check for fuel leaks.

Typically lock tite should only be used when a fastener cannot be torqued to its elastic state. Such as a gr 5 bolt going in to aluminum.

Maybe in theroy, but i in reality.... vibration and shock. I raced in the desert for years. If red loctite wasnt used liberally, you left parts all over the desert regardless of what you torqued it to....... I love the smell of loctite in the morning, it smells like.........VICTORY!

Was it used on the head bolts and main bolts too? But I do get your point, a lot of movement with non machined surfaces and things might loosen up.

Vibration mostly.....

ok enough with the monkey phuckin the foot ball game..what did you use it on and what was the out come?? theirs different loctight's out their for different purposes..

not neccessarily. at the microscopic level, when the threads pull against each other some distortion in the threads takes place as the pre load strain occur . loctite fills those gaps and hardens there keeping the threads from moving back into those spaces and releasing the prelaod when subjected to shock or vibration. everything everybody says here about prep and cleanliness is the key to all this. loctite is a good company and their technical litterature is a wealth of great information. i simply did what their engineers told me to do ( and not do ) and never had any issues.

if you do some research,you will find that the blue is used in most automotive applications[and marine]the red is some strong chit and can cause smaller bolts to break upon removal unless heat is applied.

Ive been talking to loctite and trying to get some idears why the bolts backed, Im not a 100% sure it was red,but it looks like some kind of locker was used,this was the last reply from

I would think even when you torque a faster to its recommended TQ, stretch that the thread locker would be added insurance. What if the part that was flexing,wearing etc and the tension was not as high,wouldnt the loctite keep it from backing out?

Thanks
'Rob

I have used loctite clones and found they do NOT work anywhere near as good as the real thing...any chance it wasnt real loctite??