ARPs torqued to 245 not 210...now probs

[raisemhigh]

2004 F250 w/ 80k. All the fixes back in April...oil cooler, egr delete, victor rienz gaskets and studs, fluxed heads, coolant flush, and turbo cleaned.

I have also replaced the remainder 6 of 8 injectors this past month.

Ran awesome for a few months, then noticed some puking recently (before the 6 injs were swapped). Then followed with constant tea kettle whistle under load/higher boost. My mechanic had it for a couple days and found that I'm getting exhaust pressure in my coolant....degas bottle would max out the pressure gauge within a min of driving. We have determined that it has to be one of the gaskets allowing exhaust to mix w a coolant passage.

I found out my mechanic did not torque the ARPs to the new rating. He has never had a truck come back, and is doing all labor for free.

Would this over torque cause my head gaskets to leak after 3 months? Why does the grease used, change the torque? Should I use the VR gaskets again, or should I buy OEM?

[Snake]

The over torque would not cause the gaskets to leak. Under torque would, but over torque not so much. By any chance did you have your heads checked for flatness and/or cracks when the studs were done? Were the head gaskets already blown when you had the truck studded the first time?

[jtk27]

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[Fantom]

Originally Posted by Snake

The over torque would not cause the gaskets to leak. Under torque would, but over torque not so much. By any chance did you have your heads checked for flatness and/or cracks when the studs were done? Were the head gaskets already blown when you had the truck studded the first time?

He said they were fluxed, but not decked or machined.

[pizza pig]

well thats the answer to your question, theyre probably warped and leaking, studs or not non flat heads will leak all day

[jbenford]

i heard you have to tap your stud holes before installing new arp studs?? is this true???

[Abrannan19]

probably a warped head or cracked cylinder wall.

[War Eagle B]

Originally Posted by raisemhigh

Why does the grease used, change the torque?

When calculating the preload from torquing bolts/nuts (the amount of stretch load on the bolt shank) the engineers take into account the friction of the nut threads to the bolt threads. Changing the grease changes the frictional coefficient so the amount of torque will go up or down to get the same tension load in the bolt.

[jbenford]

That is a great explanation! Thanks. Was wondering the same thing

[Abrannan19]

New Preload (torque) Recommendations for 6.0 ARP studs