shutter location

[boat4fishin]

mercruiser 140, 18' bow rider. where is the infamous falpper/shutter valve in this engine/lower unit?

 

[stonyloam]

Re: shutter location

mercruiser 140, 18' bow rider. where is the infamous falpper/shutter valve in this engine/lower unit?

Really need to know the year, but it is #7 here for a 79-82 140: http://www.mercruiserparts.com/Show...nbr=1058&bnbr=19&bdesc=EXHAUST+ELBOW+ASSEMBLY Good luck.

 

[Bondo]

Re: shutter location

Ayuh,... It should be at the Top of the Down-pipe, just downstream of the riser....

 

[boat4fishin]

Re: shutter location

Really need to know the year, but it is #7 here for a 79-82 140: http://www.mercruiserparts.com/Show...nbr=1058&bnbr=19&bdesc=EXHAUST+ELBOW+ASSEMBLY Good luck.

sorry it 1984 mercruiser 140
they say the flapper will burn up and thats ok, but can it come apart in big enough pieces and get stuck in the next elbow before the exhaust/water discharges the boat.

 

[boat4fishin]

Re: shutter location

is there a shutter valve in the drive unit, just below the pilot and just above the shift shaft coupler? just wondeering. i will have to rome drive unit to inspect this area and it will cost a gasket.

 

[stonyloam]

Re: shutter location

sorry it 1984 mercruiser 140
they say the flapper will burn up and thats ok, but can it come apart in big enough pieces and get stuck in the next elbow before the exhaust/water discharges the boat.

The shutter is mostly steel coated with rubber, the rubber will burn, but the large steel pieces will be somewhere in your exhaust system. If you pull your drive you should find the pieces in there. There is no shutter in the drive, except the pieces of yours. As Bond-o says the shutter is located at the top of the exhaust pipe. Illustrated here: http://www.mercruiserparts.com/Show...63&bnbr=230&bdesc=EXHAUST+SYSTEM+(NEW+DESIGN) Note there is an old and new shutter, don't know which you have, but both in same place.

 

[boat4fishin]

Re: shutter location

thank you very much, i have some work to get done tonight for tomorrows fishin trip.

 

[whistle]

Re: shutter location

I found the remnants of mine (1990 3.0 Liter) behind the prop. After I found water in the oil pan. Rodded and tested the manifold, put in a new shutter(old style I guess) and it runs fine in the driveway with the muffs but in the lake the water in the oil came back. Cyl. compression is perfect and will run for an hour on the muffs fine but once in the lake the oil in the water came back. Boat shop reccomends a block or extension on the riser pipe. Any thoughts? Aftermarket manifold?

 

[Don S]

Re: shutter location

You need to start a new thread with your question whistle, this is boat4fishen's thread.

 

[whistle]

Re: shutter location

ok, thanks Don