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351W Intake EGR Block-off? |
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80SN Barnfind 
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Joined: December-13-2010 Location: Niagara River Status: Offline Points: 122 |
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 Topic: 351W Intake EGR Block-off?Posted: July-27-2016 at 3:22pm |
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Ok guys, need some help from the panel on correct gasket and/or install of carb spacer on 1980 SN with 351PCM. New gasket has burned thru to cavity of spacer now dumping exhaust below carb and motor will obviously not idle/run well. Question 1) Did PCM really just rely on the gasket to block off this port for marine use? Q 2) Is there supposed to be a block off at the intake gasket? What am I missing here?
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Knowledge comes by taking things apart: analysis. But wisdom comes by putting things together.
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cadunkle
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Joined: August-17-2012 Location: NJ Status: Offline Points: 66 |
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Posted: July-31-2016 at 12:58pm |
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I made the same mistake with my car once, not installing with some sort of blockoff. Fixed it on the road by cutting a piece of an altoids tin to go below the gasket and cover the EGR passage. Held for several years until I swapped a big block in it. If I were you I'd do similar with thin sheet metal, and see about using a solid spacer. If that one is tapered use a thin (1/2") aluminum carb spacer below the tapered spacer.
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Nelson
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Joined: September-02-2010 Location: Maine, Lewiston Status: Offline Points: 135 |
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Posted: July-31-2016 at 3:50pm |
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I just logged in to look up this very issue. I am having the same problem. Boat was not running well would backfire at higher rpm's. I took the carb off and found the same issue with a hole in the gasket. I installed a new gasket and the boat ran great for about 2 hours and is now slowly acting up. I haven't pulled the carb yet but I suspect the gasket is failing. Was wondering if I had the wrong spacer or something installed.
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1986 Ski Nautique 2001
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80SN Barnfind
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Joined: December-13-2010 Location: Niagara River Status: Offline Points: 122 |
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Posted: August-04-2016 at 2:54pm |
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Well, my solution was to add a slug of aluminum in the cavity of the spacer over the port. Filed it down smooth and now seals like a charm. Pic below after a few hard runs.
 If anybody out there has this type of intake manifold, I'd love to see the spacer & gasket being used. Thanks, Noel |
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Knowledge comes by taking things apart: analysis. But wisdom comes by putting things together.
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