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Weekend Mechanic
 
vulcan300's Avatar
 
Join Date: May 2008
Location: Toronto, Canada
Posts: 740
IMS Bearing Upgrade Question

There are three chain tensioners on the 996 engine (Main Tensioner, 1-3 Cylinder Bank, 4-6 Cylinder Bank). Wayne's article only mentions loosening/removing the main tensioner and the 1-3 tensioner. Is the 4-6 tensioner (located under the AC compressor) not a concern?

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86 911 Carrera Targa
Old 06-27-2011, 10:30 AM
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When I did my IMSR, I loosened all 3, but I have read many times that the 4-6 is not necessary to loosen.
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Rick
99 996C4
06 525XI
87 944S - Sold
77 924 - Sold
Old 06-28-2011, 05:00 AM
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Thanks for the answer Rick. Did you remove the tensioners completely or did you just loosen them a bit? Did you use the set screws to secure the IMS sprocket or did you just lock the cams? Or both?
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86 911 Carrera Targa
Old 06-28-2011, 01:40 PM
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I just loosened IMS, 1-3, and 4-6. I just made sure that I didn't move the cams in the process and confirmed they didn't jump during the procedure.
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Rick
99 996C4
06 525XI
87 944S - Sold
77 924 - Sold
Old 07-01-2011, 04:37 PM
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pin the crank at TDC before you start and it should be OK. Fancy tool can be replaced by 5/16 metal rod


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2004 996 Turbo CAB X50
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Last edited by FPB111; 07-02-2011 at 06:28 PM..
Old 07-02-2011, 06:24 PM
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