Head bolts 8n

[Jeremiah's Tractors]

I have an 8n that I am rebuilding when I torqued the head down this happened at two spots!!....... What do you guys think? I didn't over torque it.

 

[soaked]

I have an 8n that I am rebuilding when I torqued the head down this happened at two spots!!....... What do you guys think? I didn't over torque it.

View attachment 110545
View attachment 110546

Each hole seems to show a "countersink", like a drill cut into the head. Are bolt heads too small? Wonder if instead of 11/16 headed bolts, yours are 5/8, and too small to span the hole properly.

 

[Non-farmer]

Henry sure loved 11/16" fasteners.

 

[Eman85]

I'd say washers and a little lube under the head of the bolt would have went a long way.

 

[Jeremiah's Tractors]

Each hole seems to show a "countersink", like a drill cut into the head. Are bolt heads too small? Wonder if instead of 11/16 headed bolts, yours are 5/8, and too small to span the hole properly.

Yes they are 5/8

 

[Jeremiah's Tractors]

They are bolts not studs

 

[used red MN]

I didn't over torque it.

The question is what did you torque them to?…65 to 70 ft. lbs is the speck. Show a photo of a couple of your bolt heads what do the shoulders under the heads look like? As much as some of these guys think that if Henry did it one way that is how it should be I don’t see how a washer would be of any harm here. I would use machine washers, these would be less noticeable to the scrutiny of those that concern themselves with such things.

 

[Jeremiah's Tractors]

I do have some studs from a different engine (I have a engine that has bad bearings that I can get pieces off of like a head...) that I can use (they have 11/16 nuts)

 

[Jeremiah's Tractors]

The question is what did you torque them to?…65 to 70 ft. lbs is the speck. Show a photo of a couple of your bolt heads what do the shoulders under the heads look like? As much as some of these guys think that if Henry did it one way that is how it should be I don’t see how a washer would be of any harm here. I would use machine washers, these would be less noticeable to the scrutiny of those that concern themselves with such things.

I torque them to 68 ft.lb.

 

[Jeremiah's Tractors]

I think I have two options: use my studs with the 11/16 nuts or use my bolts with washers

 

[used red MN]

Show a photo of a couple of your bolt heads what do the shoulders under the heads look like?

Bolt heads! I agree some lube on the bolt to head surfaces probably would have helped.

 

[Jeremiah's Tractors]

Sorry

 

[used red MN]

Sorry


View attachment 110600

No problem, I can see where this may have led to your problem. Small block Chevy V8s used 7/16” bolts head bolts with 5/8” heads and they never had a problem with this. The Ford OEM bolts had 11/16” hex heads so probably a bit wider shoulder. If you go back with these use machine washers as I recommended above. I will let the Ford experts hash it out from here.

 

[Jeremiah's Tractors]

some of the small block Chevys had washers under the head bolts

 

[Jeremiah's Tractors]

I think I will use washers under the head bolts

 

[Non-farmer]

I think I will use washers under the head bolts

You're going with 11/16" bolt heads, right?

PS: It would not surprise me if Henry put a hex on anyone who replaced any of his beloved 11/16" fittings with another size.

 

[Jeremiah's Tractors]

You're going with 11/16" bolt heads, right?

PS: It would not surprise me if Henry put a hex on anyone who replaced any of his beloved 11/16" fittings with another size.

I was planing on using bolts with 5/8 heads with washers

 

[Jeremiah's Tractors]

I got my engine in last night. Don't worry have a new radiator

 

[used red MN]

PS: It would not surprise me if Henry put a hex on anyone who replaced any of his beloved 11/16" fittings with another size.

I don’t know about a “hex”.. he has on occasion caused me to be vexed!

 

[Jeremiah's Tractors]

I have been running my 9n and today torqued the head bolts to make sure they weren't loosening up and they were still tight, so the washers worked!