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Torque To Yield Bolts


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I'm sorry, but if you consider information straight from VIDA specific to the application vs some random third party lexus hearsay to be a tie... you probably shouldn't be touching head bolts.

Dude, it would be so much nicer if you wouldnt follow up solid advice with a douchey comment. He wants outside advice, dont get mad because he doesnt take yours as gospel the minute he reads it. Its not personal against you.

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This is why they switched to angle torque by the way, it stretches the bolt a known amount based on the thread pitch regardless of the friction on it. The preliminary torques are low enough that it doesn't affect it a huge amount, and just ensure the parts are seated before the final force is applied. So in general, if you're angle torqueing the bolts it doesn't matter if they're lubed or not.

But lube makes the process smoother and also prevents corrosion.

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I dunk them in motor oil, then transfer them upright to a clean container, so that most of the oil can drain off. Usually 15 min or more to make sure there is just a light coat, not dripping oil when inserted into through head/ into block bolt hole.

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Deimos, let it go. The point of the thread was not to put down anyone who would take advice from a Lexus mechanic on Volvo engines, but to discuss, and hopefully learn whether or not one should lube head bolts. The way you stated that was absolutely insulting. Regardless of the engine, you ALWAYS lubricate the threads on TTY head bolts. It prevents seizure and helps in smoothly torquing the bolts properly. I haven't seen an engine yet with TTY bolts that doesn't specify lubricating the head bolts. Live and learn.

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You're right, that's not what this thread is about. I apologize for going off topic.

I haven't seen an engine yet with TTY bolts that doesn't specify lubricating the head bolts. Live and learn.

I had a 06 S40 with a B5244S7 profiled when I looked, it did not specify lubrication for head bolts. It does specify lube for 850s, as 5.0 linked. However, I checked and noticed the current Volvo head bolts themselves do not come dry, they've got something kinda sticky on them and the techs here shove them in a dried out block just like that. Guess Volvo removed the step because they made them pre-lubed.

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You're right, that's not what this thread is about. I apologize for going off topic.

I had a 06 S40 with a B5244S7 profiled when I looked, it did not specify lubrication for head bolts. It does specify lube for 850s, as 5.0 linked. However, I checked and noticed the current Volvo head bolts themselves do not come dry, they've got something kinda sticky on them and the techs here shove them in a dried out block just like that. Guess Volvo removed the step because they made them pre-lubed.

or to keep them from rusting

You're right, that's not what this thread is about. I apologize for going off topic.

I had a 06 S40 with a B5244S7 profiled when I looked, it did not specify lubrication for head bolts. It does specify lube for 850s, as 5.0 linked. However, I checked and noticed the current Volvo head bolts themselves do not come dry, they've got something kinda sticky on them and the techs here shove them in a dried out block just like that. Guess Volvo removed the step because they made them pre-lubed.

or to keep them from rusting
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I'd say lube em. Horsepower Tv toured the ARP factory and this topic was covered at length. They suggest to lube and they make a special lubricant specifically for that. They also did a side by side comparison between lubed and not lubed and illustrated how you can get false torque readings without. Anyway my two cents. Peace

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