4.0 SOHC head gaskets/timing chains

[SenorNoob]

That's interesting. The exhaust uses bolts on my OHV. I did have to get some different length for the Ranger manifolds vs the Aerostar ones.

 

[JJMaine]

How about the flex plate bolts? I've read that they are TTY but many here have just re-used them and use the old torque spec from the OHV that weren't TTY bolts of 52ft lbs with loctite (and no TTY sequence)? Those darn things are $15 a piece!

 

[JJMaine]

This has got to be a typo right? The manual says the block and heads need to be flat within .0004". I'm thinking they meant to write .004"? I hope, if not I'm screwed haha

 

[alwaysFlOoReD]

This has got to be a typo right? The manual says the block and heads need to be flat within .0004". I'm thinking they meant to write .004"? I hope, if not I'm screwed hahaView attachment 135988

Go with the metric measurement, and cross reference. My bet is on .004....
Turns out it is .0004"
*** EDIT ***
The measurement of .0004 is for the straight edge, not the block or heads!
You could put a straight edge up against a piece of glass to check the straightness with feeler gauges.

 

[85_Ranger4x4]

Go with the metric measurement, and cross reference. My bet is on .004....
Turns out it is .0004"
*** EDIT ***
The measurement of .0004 is for the straight edge, not the block or heads!
You could put a straight edge up against a piece of glass to check the straightness with feeler gauges.

Yeah, a "straightedge" for checking heads is kind of special.

Don't be using your wooden ruler from 3rd grade.

 

[Shran]

How about the flex plate bolts? I've read that they are TTY but many here have just re-used them and use the old torque spec from the OHV that weren't TTY bolts of 52ft lbs with loctite (and no TTY sequence)? Those darn things are $15 a piece!

Maybe someone will correct me but I doubt they are TTY. I've reused them on older trucks every single time and it's never bit me.

 

[85_Ranger4x4]

Maybe someone will correct me but I doubt they are TTY. I've reused them on older trucks every single time and it's never bit me.

I have too but older isn't the same as newer...

And Ford can be more nitpicky than the average joe too. They also say u-joint flange bolts are one time use.

If it calls for the TTY sequence you probably shouldn't reuse them though.

 

[JJMaine]

I do have a machinist straight edge. I got it off Amazon but it's allegedly certified straight to within a couple thou. There's just one spot that worries me on my block and I can fit a .002" feeler gauge in, that's right above cylinder 4, the cylinder that leaked the most before.

At this point I've gone this far so may as well send it but it still worries me.

If that spec is for the straight edge, then what is the tolerance for the block deck does anyone know? I've done some reading and some say it's .003-.005"?