Head Bolts

[SkipBurney]

Do the IDI engines use regular head bolts or are they those sorry torque to yield POS bolts

 

[nelstomlinson]

Torque to yield? Is that where one of the two bolt heads twists off when it's tight enough?

The one I just took apart had what looked like standard, 12 point bolts. I had to buy some 12 point sockets. It's been a long time since I got into an engine.

 

[homelessduck]

They are not TTY.

 

[SkipBurney]

Torque to yield? Is that where one of the two bolt heads twists off when it's tight enough?

The one I just took apart had what looked like standard, 12 point bolts. I had to buy some 12 point sockets. It's been a long time since I got into an engine.

The 6.0 and newer 7.3 engines used the torque to yield bolts and were notorious for leaking and blown head gaskets. As soon as my 6.0 F-350 went out of warranty I changed them out for a good set of studs and tossed the egr cooler.

 

[IDIBRONCO]

The one I just took apart had what looked like standard, 12 point bolts.

Those are the correct head bolts.

 

[Dane Rickford]

How many ft-lbs are stock head bolts good to? I torqued mine to 105, but are they good for higher torque?

 

[IDIBRONCO]

Factory spec is 100 lb/ft. I believe that I've seen people say they've gone to 110 but don't quote me on that. Even though they aren't TTY bolts, they can and do stretch some over time. The best bet is head studs.

 

[chillman88]

Factory spec is 100 lb/ft. I believe that I've seen people say they've gone to 110 but don't quote me on that. Even though they aren't TTY bolts, they can and do stretch some over time. The best bet is head studs.

Is that for the 7.3 or the 6.9? I assume they have different torque specs?

Is that spec oiled threads? I know it's supposed to make a difference if the threads are lubricated or dry.

 

[Dane Rickford]

Is that for the 7.3 or the 6.9? I assume they have different torque specs?

Is that spec oiled threads? I know it's supposed to make a difference if the threads are lubricated or dry.

That’s for the 7.3. And I did mine oiled just for a more accurate reading, but I don’t know if it’s supposed to be done oiled

 

[Jake_IN]

From the service manual.

"Lightly lubricate bolt threads and mating surfaces of bolt heads and washers with engine oil..."

Attached is the sequence.

You must be registered for see images attach

 

[Thewespaul]

Factory turbo engines have different head bolts and were torqued to 110 ft lbs.

 

[Dane Rickford]

Factory turbo engines have different head bolts and were torqued to 110 ft lbs.

How much psi are factory turbo head bolts good for?

 

[Dane Rickford]

Whoops, I meant how many psi of boost in the previous post

 

[Macrobb]

Remember, it's not boost that blows gaskets, it's the (much) higher pressures from burning that air with more fuel.
So 45 psi and no extra fuel may not blow a gasket, while 10 with extra fuel may.

That being said, I've run a N/A IDI block and bolts at 15 psi, ~250 RWHP for over a year before failure... and I cranked it up *after* I'd overheated the engine and had the gaskets weeping coolant when hot already...

 

[IDIBRONCO]

Is that for the 7.3 or the 6.9? I assume they have different torque specs?

From what I recall, 6.9's were torqued to 80 lb/ft. Maybe 85?