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Position indicator on Flywheel. 

 

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 Post subject: Position indicator on Flywheel.
Posted: Thu May 26, 2011 2:03 pm 
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Hi folks,

I'm about to bolt my flywheel on to the crank and I just noticed a dimple on the outside of one of the holes like is't an indicator of some sort.
My Gregories manual doesn't mention it so I guess maybe it's not, but better to ask and be sure.. do I need to line the flywheel up on the crank in any particular way?

ta

Frank
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 2:10 pm 
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Flywheel only goes on one way. The holes are offset, so you will have to spin it until it lines up properly.

Might be some casting mark to assist in the balancing on manufacture or something.
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 2:16 pm 
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I think I just found what it is..

closer reading of the manual found this:

Locate a paint mark on the pressure plate cover which identifies the heavy point of the cover. The heavy point should be opposite the 5mm drilling on the flywheel which indicates it's hjeavy point.

So I guess it helps offset imbalances in the flywheel/pressure plate.

cheer

Frank
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 2:38 pm 
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oddly I can find no mark on the pressure plate to indicate it's "heavy side"... called clutch industries on their helpline and he'd never head of it..

asked me to fax the page of my manual to him....

Last edited by frankieh on Thu May 26, 2011 4:52 pm, edited 1 time in total.

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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 2:40 pm 
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What manual is it?

I've read the EF/EL manual from cover to cover and never read anything like that.
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 2:54 pm 
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Gregories No 270..

Here is the page in question with the paragraph I've marked in red.

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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 2:58 pm 
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That explains it then. Probably some left over passage from XA or XF days as they tend to do.

Every pressure plate i've seen was balanced at the factory, so was basically ready to slip right on. Whichever way.
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 3:02 pm 
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sweet, good to know, was just being extra careful.. not the sort of thing you want to find out you got wrong once it's in the car.

The genuine ford manual says this about the installation.


Hold the clutch disc and pressure plate and cover assembly in position on the flywheel and align the balance mark/s.


So it isn't just gregories, though neither give you a picture to show you want they mean.

There are locating pins in the flywheel that the pressure plate fits too.. but all the bolts line up regardless of which way you locate on the pins so it doesn't help. There is a tiny blue paint mark on one side and a "05" on the other.. so perhaps it's one of those?
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 4:17 pm 
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I just bolted everything up to the fly wheel without any aligning (besides pressure plate since you have to slot the input shaft through it) and haven't had issues for the last 2 years.

 

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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 4:26 pm 
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yeah... the clutchindustry guys are discussing it now, they've been CC'ing me..


It does say the flywheel is out of balance without the pressure plate round the right way.. wish they'd tell you what that way is though.

You have a one in 3 chance of just guessing the correct way since it can only go on three ways.. perhaps you guessed well? I'm not that lucky... :-(
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 4:41 pm 
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wow.. ive done few clutch changes in xd - xf a few years ago and never took notice or done anythin like this aligning the clutch.
never had a issue.

 

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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 4:44 pm 
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frankieh wrote:
You have a one in 3 chance of just guessing the correct way since it can only go on three ways.. perhaps you guessed well? I'm not that lucky... :-(


If its that much of a problem, it can go on 6 ways. Just need to take the dowels out. :wink:
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 4:49 pm 
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if it isn't much of an imbalance, you'd probably notice it as a roughish seeming idle.. which I have anyways.. but I'm supercharging this puppy, want to make sure I get it right.

I'm gonna dig up my two spare pressure plates and see if they can point the way.. if one is geniune ford it may have the mark on it and I can see it's orentiation.
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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 4:53 pm 
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I'm interested to see what the outcome is.
I've never located a pressure plate by these markings.
I've done at least 4 clutch changes (not the same car) and never had a problem.
Surely I cant be that lucky.

I wonder if they are only referring to the V8's that had an out-of-balance flywheel.

 

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 Post subject: Re: Position indicator on Flywheel.
Posted: Thu May 26, 2011 5:16 pm 
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Well, I dug out my old original ford pressure plate and cleaned it up and what do you know.. it has the paint mark that gregories were talking about.

Image

If the ford and gregories manuals are correct like this seems to indicate, it means that the flywheel has a heavy side that is meant to counteract the heavy side of the pressure plate.. meaning if it isn't the right way around, you have a one in 3 chance of having one side have the heavier side of the flywheel as well as the heavy side of the pressure plate.

Problem is that even knowing which was the right end on the factory ford one doesn't help that much because they are 3 way semetrical.. I can only make an educated guess and pick the side with the most balancing holes?
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