Reuse head bolts when changing head or replace?!

[rydningen]

I managed to break a bolt on my head while changing to a PAR 12.5 on my 2011 800 this weekend.

I read through the install sheet that came mith the head and it said to replace all the head bolts.

Then I checked with what SLP recommended about this for the kits that comes with a different head, and I could not find anything about replacing the bolts there.

So, should I replace or reuse?

I have never had any problem reusing the head bolts, and I think my torque wrench was off and might have caused the bolt to break. But since it said they all should be replaced I started wondering what to do...?

 

[Seabass152]

No need to replace. I just took a look at my PAR head install sheet, and it reads "replace the bolts in the head". Meaning reinstall the bolts in the head.

 

[G-Force]

If it's the first time removing-reinstalling, I wouldn't worry too much, but they certainly CAN stretch, and not allow you to get proper torque.

 

[rydningen]

Thats what I read to, "Replace the bolts in the head". I guess I have misinterpreted it.

 

[gman086]

If you got any coolant into the bolt holes (when pulling the stock head) you can hydrolock the head bolts and they'll break under proper torque. Like others said - no need to replace, just make darn sure the holes are DRY!

Have FUN!

G MAN

 

[NapaMatt]

Got to Keep Q-Tips in the shop for this Reason!!!!

 

[Super Sled]

I always replaced head gasket every time, but if bolts look ok I reuse.

 

[NapaMatt]

Add a touch of Black RTV the the heads of the bolt too.. to seal out the Anit freeze!

 

[gman086]

Got to Keep Q-Tips in the shop for this Reason!!!!

EXACTLY what I use!

Have FUN!

G

 

[rydningen]

I did use q-tips to remove all the coolant so I know they didnt hydrolock.

But a friend of mine which is an airplane mechanic stated that there is a difference between setting torque "dry" or "wet". By setting torque when the threads are lubricated in some way this can cause overtorque even if the wrench says it is correct.

I have never heard of this before, but it kinda makes sense...and I would imagine he knows his stuff since he travels all over the world fixing rather expensive machinery