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Flywheel Bolt Tension.. Urgent! 

 

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 Post subject: Flywheel Bolt Tension.. Urgent!
Posted: Mon Aug 14, 2006 10:32 pm 
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Hey im putting an AU engine into my EB and we snapped a flywheel bolt the other day... so i bought 6 new ones i was just doing one up and snapped it again.. im doing em up to 100 - 115NM that it says in the ellerys manual

so whats the correct tension in NM?

 

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Posted: Mon Aug 14, 2006 10:35 pm 
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haynes say 110nm

 

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Posted: Mon Aug 14, 2006 10:38 pm 
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does your tension wrench need re-callibration?

 

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 Post subject: Re: Flywheel Bolt Tension.. Urgent!
Posted: Tue Aug 15, 2006 1:19 am 
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TickfordXR wrote:
Hey im putting an AU engine into my EB and we snapped a flywheel bolt the other day... so i bought 6 new ones i was just doing one up and snapped it again.. im doing em up to 100 - 115NM that it says in the ellerys manual

so whats the correct tension in NM?



yeh youve got it... do em up til they break, then back off half a turn :)
ie back to where they were tight again :)


if your breaking them, is there something in the bottom of the holes? oil, grease? anything that could cause hydraulic lock? they shouldnt break at 110nm..

-mitch

 

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Posted: Tue Aug 15, 2006 1:26 am 
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use a bit of brake clener spray some in the hole and it will dry up any oil and stuff

 

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Posted: Tue Aug 15, 2006 9:57 am 
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More reading: http://www.fordmods.com/forums/viewtopic.php?t=30043

If you haven't got a thread locker with your bolts, use Loctite 262 or similar.

 

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Posted: Tue Aug 15, 2006 11:59 am 
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The flywheel bolt holes in an AU crank are a fair bit shorter than in previous cranks and require special shorter bolts. Its possible the bolt is bottoming out and snapping.

Are you using the AU specific bolts, or trying to use your existing EB bolts?
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Posted: Tue Aug 15, 2006 1:39 pm 
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1989 - 2005 use the exact same bolt

 

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Posted: Tue Aug 15, 2006 1:42 pm 
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TickfordXR wrote:
1989 - 2005 use the exact same bolt


Nope... I know of 4 syle bolts used in that time.
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Posted: Tue Aug 15, 2006 2:03 pm 
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Who else other than ford would sell flywheel bolts, just places like repco and stuff?

 

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Posted: Tue Aug 15, 2006 2:05 pm 
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Well i just rang up ford..

AU = 75NM
EB = 115NM

I also got him to check on the computer and they both have the exact same flywheel and bolts

so why the tension change between years?

 

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Posted: Tue Aug 15, 2006 2:12 pm 
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TickfordXR wrote:
Well i just rang up ford..

AU = 75NM
EB = 115NM

I also got him to check on the computer and they both have the exact same flywheel and bolts

so why the tension change between years?


different crank

 

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Posted: Tue Aug 15, 2006 2:14 pm 
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TickfordXR wrote:
Well i just rang up ford..

AU = 75NM
EB = 115NM

I also got him to check on the computer and they both have the exact same flywheel and bolts

so why the tension change between years?


Technically Ford is wrong. If they look into microcat they will see the bolt has been superceeded a couple of times.

I have been in the situation where microcat gave the me 'right' flywheel bolt, but it didnt suit the application. A little investigation into the part found that microcat was wrong.

Obviously there has been a torque setting change and that we didnt know about, and that would be the problem.
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Posted: Tue Aug 15, 2006 2:23 pm 
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TickfordXR wrote:
I also got him to check on the computer and they both have the exact same flywheel and bolts
Maybe this is like head gaskets, where the AU parts are the only ones available any more, and th AU bolts will still fit earlier models, despite being shorter??

TickfordXR wrote:
so why the tension change between years?
In the link I posted earlier, the torque variations were substantial depending on the grade of bolt, hence the other reply where it has been said that there are a number of bolt types.

Might be best to talk to an engine reconditioner/rebuilder and ask them, and ask what they do when fitting a falcon flywheel.

And let us know what the reply is . . . . . .

 

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Posted: Tue Aug 15, 2006 2:28 pm 
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I spoke to my uncle whos a mechanic...

He said he does to em 75NM

so that it is then

 

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