Head bolts tightening

[jsilva]

Forgive me if this has been discussed, but I was curious about the tightening procedure of the OEM head bolts regarding whether people do it dry or with lube—and if lube is used, what kind and if they alter the procedure.

 

[Mikey27]

Always lube.
Engine oil.
Same procedure.
I'm pretty certain it's called for in the book.

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[jsilva]

Always lube.
Engine oil.
Same procedure.
I'm pretty certain it's called for in the book.

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Thanks Mikey. Actually it doesn’t say it in the service manual, at least in the two places I see. It’s curious, because even though it’s mostly an angle-based tightening rather than a torque measurement I’d assume lube or no lube would make somewhat of a difference, and for something so important that would be a problematic oversight in the service manual. Maybe the difference isn’t significant enough?

 

[Mikey27]

Thanks Mikey. Actually it doesn’t say it in the service manual, at least in the two places I see. It’s curious, because even though it’s mostly an angle-based tightening rather than a torque measurement I’d assume lube or no lube would make somewhat of a difference, and for something so important that would be a problematic oversight in the service manual. Maybe the difference isn’t significant enough?

I just looked it up, and what I saw in the book was the main bolts, it shows those to be oiled. They're also torque then torque angle procedure.

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[jsilva]

I just looked it up, and what I saw in the book was the main bolts, it shows those to be oiled. They're also torque then torque angle procedure.

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Do you mind posting a screenshot? Here’s a screenshot of mine. All of the other places I see reference to the cylinder head bolts are basically the same and don’t say anything about oiling.



What I meant about it being primarily angle tightening is that the torque procedure is relatively minimal—34 ft lbs is small compared to two turns of 90°.

 

[Mikey27]

Do you mind posting a screenshot? Here’s a screenshot of mine. All of the other places I see reference to the cylinder head bolts are basically the same and don’t say anything about oiling.

View attachment 17403

What I meant about it being primarily angle tightening is that the torque procedure is relatively minimal—34 ft lbs is small compared to two turns of 90°.

Mains are what I was seeing that are to be oiled, definitely doesn't call for it for head bolts. I would still do it anyway, there's a lot of friction going on when you do the final torque angles, and the lube won't affect that. It will change the initial a bit, but tbh not enough that I would worry about it, just use the low end of the range.

Here's the page's I'm referring to.

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[jsilva]

Mains are what I was seeing that are to be oiled, definitely doesn't call for it for head bolts. I would still do it anyway, there's a lot of friction going on when you do the final torque angles, and the lube won't affect that. It will change the initial a bit, but tbh not enough that I would worry about it, just use the low end of the range.

Here's the page's I'm referring to.

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Oh right, sorry I missed what you said. Yes I did see about oiling the main bolts.