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Registered User
Join Date: Nov 2013
Posts: 6
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CIS airbox replacement... how long?
2 questions.
1. How long to replace a cis airbox 2. Engine in or out of the car. Which is easier and faster. |
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11-13-2013, 07:51 AM
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Fleabit peanut monkey
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Don't pull the engine.
Time for a pro to replace or time for a DIY guy that has never done it before? Pro - guessing up to 4 hours. DIY, budget a full day assuming you have all the parts at your side.
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1981 911SC Targa |
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11-13-2013, 08:13 AM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,482
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The later the model CIS, the longer it takes.
Bruce |
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11-13-2013, 12:58 PM
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Registered
Join Date: Feb 2006
Location: Ontario Canada
Posts: 2,947
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my 78 took me 90 minutes to drop the engine about 4 inches and remove the CIS , never done it before .. beginning to having it sitting on my bench ..
spend 2 or 3 days completely rebuilding CIS once i had the parts. about 45 mins to put back in ..about an hour of tweaking and CO adj ..    
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1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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11-13-2013, 01:38 PM
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Registered
Join Date: May 2008
Posts: 2,948
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A '76 (based on your user name) has auto cold-start, so my shop, depending on what we knew about the car, used either a partial drop (no oil leaks + clutch history), or engine removal. You'll want throttle bell crank/console bushings, thermostat o-ring, and an oil pressure switch, injector sleeves + o-rings; in addition to all the airbox replacement parts. It's an all day job to do right and clean, even for a "pro." You should know how to check/adjust the sensor plate height, and when the car is back together, be prepared to have a CO% machine available for tuning. After all that, you should probably plan on measuring cold control pressure (gauges required). Big job.
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Keep the Shiny Side UP! Pete Z. |
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11-13-2013, 04:00 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
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account for every nut and washer. check down all the ports and turn the engine over by hand before reinstalling to be sure nothing went in. 76 is pretty easy. a 3/8" drive swivel socket is handy for the manifold nuts. a 4-6" drop helps a lot. shop time about 4 hours.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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11-13-2013, 04:02 PM
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Registered User
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Tools for CIS Removal....
Swivel Sockets in both 1/4" & 1/2" drive with assorted extensions are key to removing the nuts under the runners.
I also found that a ratcheting articulating box end also was handy. On my 1980sc the nuts were 12mm. I am not sure what size they are on your engine. Watch those nuts and washers while you remove them. You do not want to lose anything down the open ports. Have a magnet handy. I used a tip from another Pelican board member and made up masonite covers for the intakes using the gaskets as templates. 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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11-13-2013, 04:22 PM
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Registered User
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Block off intake ports
Masonite block offs for intake ports prevents nuts and washers and debris from
falling in engine. 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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11-13-2013, 04:30 PM
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1981 Porsche 911 SC Targa
1980 911sc Targa
