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CIS to ITB EFI conversion
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dannichols1474
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Join Date: Sep 2019
Location: Milpitas, CA
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Once the engine was on the engine stand, the engine tear down began starting with the camshafts. If your engine uses nuts to hold the cam timing chain sprockets to the end of the camshafts, then you will need a pair of special tools the get the camshaft nut loose. The tools are described in Wanye's engine rebuilding book. One tool is a double D shaped socket that holds the camshaft steady and the other tool is a beefy 46mm crows foot to grab the camshaft nut from the side. The tools are 1/2 inch drive and my 1/2 inch drive ratchet is 24 inches long and my 1/2 inch drive breaker bar is 30 inches long. With the ratchet attached to the 46mm crows foot and the breaker bar attached to the double D socket, I was able to hold the camshaft from rotating while loosening the camshaft nut by myself. I point is the nut is on pretty tight and you need a long lever arm to get the nut loose.
Once the camshaft nut was loose, I removed the nut holding the chain tensioner in place and used a pry bar to gently persuade the tensioner to slide forward out of the chain housing and disengage the tensioner sprocket. That released the tension on the camshaft timing chain so the sprocket, etc can to removed from the end of the camshaft.
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Dan
1975 911 Carrera
"CIS to ITB EFI conversion" thread
Updated (2) Table of Contents pg17 post 339
02-17-2024, 02:03 PM
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