crank pulley torque - wrong in books?

[Remco]

Hi all

Got the Impreza engine all back together and was just triple checking
what I have done - it will be going back in tomorrow if all goes well.

Just read a post that states that the crank pulley is supposed to be
tightened to over 100 ft/lb and that the manuals are all wrong. Is this
true?
Both my impreza manual say that it is supposed to be 69-76 ft/lb so I
tightened it to 73. Is that right? Does it require blue locktite? If
the manual is wrong, is it wrong elsewhere I need to know about?

tia
Remco

 

[Edward Hayes]

130 ft/lbs is the magic number for my 2.5L Forester 2000.

 

[Remco]

130 ft/lbs is the magic number for my 2.5L Forester 2000.

Thanks - looking at the engine manual for a 2.5, that is also
considerably higher. I'll retorque mine.
Wonder why these manuals are so consistently off..?

 

[S]

Hi Remco!

Hi all

Got the Impreza engine all back together and was just triple checking
what I have done - it will be going back in tomorrow if all goes well.

Just read a post that states that the crank pulley is supposed to be
tightened to over 100 ft/lb and that the manuals are all wrong. Is this
true?
Both my impreza manual say that it is supposed to be 69-76 ft/lb so I
tightened it to 73. Is that right? Does it require blue locktite? If
the manual is wrong, is it wrong elsewhere I need to know about?

You will have noticed that only the last 10mm or so of the crank and
key actually engage the pulley. If it _does_ loosen in service, at the
very least it buggers up the end of the crank. I generally get the
bolt as tight as I can; probably in the 150ftlb range. I don't use
loctite, but it certainly won't hurt anything to add a dab.

If this seems excessive, think back to how much trouble it was to
loosen that sucker . . . that's where you want it.

Mmmmm, what else? Resist the temptation to over-tighten the exhaust
manifold nuts. I don't know what the book says, but these should only
be tight enough to compress the gasket a little, not crush it.
Probably around 10ftlb-ish. Also put some antisieze compound on the
studs; somewhere on down the road, someone will thank you for it.
Nothing else stands out in my memory; reasonable torque values
achieved with the hand tools that fit the fasteners should be fine.
"And the tears of it are wet" ;-)
(Mark Antony, from Shakespeare's Antony and Cleopatra; look it up if
you want a chuckle.)

Plan on going over everything after the new motor has been run a bit.
Just to put your mind at ease, don'cha know.

ByeBye! S.

Steve Jernigan KG0MB
Laboratory Manager
Microelectronics Research
University of Colorado
(719) 262-3101

 

[Remco]

Hi Remco!



You will have noticed that only the last 10mm or so of the crank and
key actually engage the pulley. If it _does_ loosen in service, at the
very least it buggers up the end of the crank. I generally get the
bolt as tight as I can; probably in the 150ftlb range. I don't use
loctite, but it certainly won't hurt anything to add a dab.

I was wondering about that - It looked the same when I took the crank
off (took pictures of everything) so figured that was normal.

If this seems excessive, think back to how much trouble it was to
loosen that sucker . . . that's where you want it.

Yup -- I used an old Radio Shack antenna pole to loosen it.

Mmmmm, what else? Resist the temptation to over-tighten the exhaust
manifold nuts. I don't know what the book says, but these should only
be tight enough to compress the gasket a little, not crush it.

That's what I did. I've had suckers like that break on me on a
different car - not fun.

Probably around 10ftlb-ish. Also put some antisieze compound on the
studs; somewhere on down the road, someone will thank you for it.
Nothing else stands out in my memory; reasonable torque values
achieved with the hand tools that fit the fasteners should be fine.
"And the tears of it are wet" ;-)

Antiseize compound is our friend

(Mark Antony, from Shakespeare's Antony and Cleopatra; look it up if
you want a chuckle.)

LOL! There's a reference I had forgotten about.

Plan on going over everything after the new motor has been run a bit.
Just to put your mind at ease, don'cha know.

That's an excellent thought and will follow that advice.

Thanks!
Remco