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Join Date: Oct 2007
Location: Idaho
Posts: 193
cam sprocket alignment question

I am putting the cams back in and have a question about alignment as outlined in the book. Please check my math.

I have an early case (79) so I am using the early case measurement for the intermediate shaft. Mine measures out to 2.043".

For the left sprocket measurement I get 1.110" and the book says to subtract 54.8mm (2.157") which equals -1.047.

It says these are supposed to be equal but this is an inch off so what am I doing wrong? Yes I subtracted out the straight edge thickness.
Old 05-20-2010, 12:21 PM
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beancounter
 
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I had the same issue...there is a typo in the book. Where it says to subtract, you have to add.
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Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 05-20-2010, 01:41 PM
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Thanks for the reply. I still haven't got it right.

Mine intermediate shaft measures out to 2.043".

For the left sprocket measurement I get 1.110" and if I now add 54.8mm (2.157") I get 3.267 which is worse.
Old 05-20-2010, 02:07 PM
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Drive it like u stole it.
 
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I just did this last weekend. Take a look at Figure 6-9 on page 159. Make sure you are going down the access hole to measure from the front flange to the intermediate shaft gear face.

First measure the thickness of your strait edge, write this down.

Next measure the distance from the front flange to the intermediate shaft gear face (down the hole) and write this down.

Add the thickness of the strait edge to the flange to intermediate shaft front gear measurement. This is now your reference measurement!

Now you have the desired measurement of the right side gear face (should be very close to your reference measurement). The right side should line up with the intermediate shaft gear face within .25mm

Now measure the left side. Write this down than subtract 54.8mm from this measurement. It should be within .25mm of your intermediate shaft measurement.
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77 Euro 911 3.0 Wide Body - under construction
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Last edited by jonesb930; 05-20-2010 at 07:16 PM..
Old 05-20-2010, 07:13 PM
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Join Date: Oct 2007
Location: Idaho
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I was making a rookie mistake. I was measuring the intermediate shaft correctly but not the cam sprocket. I was measuring from the chain case to the sprocket and not from the rear most face of the case to the sprocket.
I looked at a drawing of this being done on the internet and that's what clued me in. The drawing was from Wayne's other book.
Thanks jonesb930 for your instructions.
Old 05-20-2010, 08:17 PM
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Glad to hear you have it all worked out. I think I will set up my video camera in my garage and make a few youtube video's on my build. It's a shame the case is already fully assembled or I would have documented that as well.
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Bill Jones
Jupiter, FL
77 Euro 911 3.0 Wide Body - under construction
http://www.flickr.com/photos/rennsport/collections/72157618856489537/
Old 05-21-2010, 04:33 AM
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