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Rank: Administration
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Joined: 12/3/2007
Posts: 225
Points: 424
Location: Stafford
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Flappers ... Keep water out the engine from storms.
If you've read Sorrydogs's sad tale, he lost a good 671 because of the lack of flappers. Storms and high waves push water into the exhaust and can back up into the engine. Who knew? Not me.... Will be buying them next week.
WD40 is a OK fix for water ... iff'n you know before you start.
Unzinced ships sink at slips.
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Please Register : New members may not post until approved. An email is sent after approval. We do this to reduce those who use these forums for spamming.
This forum is for Marinette Owners and other aluminum boat boaters who wish to share boating information. Aluminum Roamer owners are also welcome. (Do not post content you do not have the right to post and mass (robots) posters are unwelcome. We also have a marine electronics page and lots of Chrysler Engine info. State by what permission, you copy content and accredit properly.) The site is now fixed with some more Chrysler information. I will try to post more information soon. We have space for pictures on the new location. Use shinkpic to autochange size http://www.onthegosoft.com/sp_download.htm
Great Sites - http://www.marinette.com Marinette Company
http://www.geocities.com/dougmrose/ Wiring Marinette
http://fastjeff.tripod.com/ Repair Tricks and Techniques for Marinettes
http://www.greatlakesmarinetteclub.com/
PLEASE post in the appropriate folder. Please, do not post your actual email address in publicly readable websites.
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Rank: Top Rank Aluminum Star
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Joined: 12/5/2007
Posts: 981
Points: 1,793
Location: New Tripoli, PA
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I wouldn't rely on flappers alone. If your exhaust pipe is that low, you need to shift weight forward or add spacers to the risers to get them higher.
I recall that John Hall's old 32 footer--rafted right beside mine--had its exhaust openings virtully underwater where mine were way above. Not sure why.
Jeff
I'm STILL waiting for my bailout!
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Rank: Top Rank Aluminum Star
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Joined: 12/4/2007
Posts: 600
Points: -1,656
Location: White Lake MI. or on my BOAT
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Client number eight, (alias Jeff)  Seeing John Hall had problems with a low exhaust tube. Why did he take the flaps off his boat & sell them to me they where damn near new looking & still working fine. I was wondering if we could still get the exhaust dumps we use to use a million years ago when we teens to fool the cops & run straight pipes on our 40 & 50 hot rods  but in a 4" size & installed them just forward of the thru hull tube when one left the boat for any extended time they could shut the flap then open when the returned . One draw back would be U would surely have to remember to open them before U started the engines. Just a thought  Norm, BIG  s & DUX Live On 
KEEP YOUR BUTTS DRY &YOUR HOOKS WET. (also your whistle)
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Rank: Dedicated Tin Star
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Joined: 12/9/2007
Posts: 83
Points: -458
Location: Fayetteville, NC
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on my '64 the exhaust tubes exit the boat under the waterline also, i always wondered if that was a "muffling" technique used by marinette.... i was thinking of making a set of "caps" to use over the outlets for when im not around, or even something like a big rubber corks to plug the outlets, with "remove before flight" stringers attached and ran up over the transom to remind to remove......that would be a pain in the butt though, and a serious pain with a swim platform...... i like norms idea of the exhaust dumps.....hey, ya dont need to be an oldtimer to know about, or have used those !! what about something like a vernalift muffler ??
http://theboaters.com/boats/Powerboat/Classic_/_Antique/Marinette/express/1964/MHYZHENOne more busted knuckle and i'll have a complete set !
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Rank: Administration
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Joined: 12/4/2007
Posts: 252
Points: -324
Location: Potomac MD
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Vernalift:
We had a discussion on these a few years ago and I recall that they weren't made any more and when they were, were quite costly
Joel Albert, Potomac MD
"Charlie B" - 32' FBS
docked Deale, MD
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Rank: Top Rank Aluminum Star
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Joined: 12/10/2007
Posts: 310
Points: -2,143
Location: DeWitt, MI, but spend most of my time at work(LDT)
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Put them on last year. Thanks. 
 Surface Interval 1975 28' Express, Single Chrysler M360 ('87), Raymarine E120 MFD, HD digital sonar, GPS,
4KW radome, S1G AST autopilot, SIRIUS satellite weather, Floscan 9000, 25HP Mercury kicker,
24 volt stern thruster, Interlux Brightside paint ('06-'08) Trilux 33 on bottom,
Big Jon electric downriggers, Traxtech swivel mounts, Bert's track and ratchet holders. Click here for all the equipment details and here for the complete photo album. |
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Rank: Top Rank Aluminum Star
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Joined: 12/5/2007
Posts: 981
Points: 1,793
Location: New Tripoli, PA
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The important thing here is to LISTEN to the engine as you attempt to start it after letting it sit overnight (or longer). If it sounds like (this on the starter), RRRRRRRRR, you're okay; light her up. But if it does this, RRRR-hesitate-RRRR--hesitate, then do NOT try to start it! There's water in a cylinder and, since water doesn't like to compress, you can blow a head gasket, bend a rod, blow a piston or even blow the head off the motor!
Two full revolutions of the motor is all you need.
Note: If your motor is one that fires instantly you'll need to install a "bump" circuit to wheel it over without allowing it to start. I shudder to think of those new EFI motors that fire at the turn of the key!
Jeff
PS: You folks that only run your boat from the flybridge need to be especially careful on first start up since you can't hear as well as us "lower helm runners."
I'm STILL waiting for my bailout!
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Rank: Top Rank Aluminum Star
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Joined: 12/7/2007
Posts: 394
Points: 726
Location: Central Florida and the DC area
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I always start and shut down from the lower helm, I can hear the engines better. Boy can I hear them.
Since Sorrydog's sad tale, I hold down the "stop" button which turns of the fuel and then crank as recommended. Then I can let up on the button to start.
You could do this with a gas engine if you wired the start switch correctly, to allow starter with no ignition. Don't know how to wire this, but a pushbutton that kills the spark would work.
"I remember when welfare was for poor people..."
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Rank: Dedicated Tin Star
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Joined: 12/7/2007
Posts: 76
Points: 255
Location: Middle River
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Fastjeff wrote:I wouldn't rely on flappers alone. If your exhaust pipe is that low, you need to shift weight forward or add spacers to the risers to get them higher.
I recall that John Hall's old 32 footer--rafted right beside mine--had its exhaust openings virtully underwater where mine were way above. Not sure why.
Jeff Never had any problem with my exhaust, hydro-lock or anything like that (unlike some people :) . Only had flappers on there because it was required for the warranty on the repower. As I recall the exhaust was just above the waterline at rest. No water stayed in the tube. However I had a good 20" of drop from the elbow to the waterline. Plus 8' of run. Jeff maybe you were thinking of the underwater exhaust system I put on?
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Rank: Top Rank Aluminum Star
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Posts: 981
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Location: New Tripoli, PA
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I seem to recall being in the water behind your boat (at the Port Deposit races, remember?) and noting that your exhausts were several inches lower than mine. I guess they were not actually IN the water, though (unless I was, ah, sitting on your cockpit!)
Jeff
I'm STILL waiting for my bailout!
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Rank: Dedicated Tin Star
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Location: Middle River
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Fastjeff wrote:(unless I was, ah, sitting on your cockpit!)
Jeff That's scary. I was going to say exactly the same thing .... John
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Rank: Top Rank Aluminum Star
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Posts: 359
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Location: JACKSONVILLE,FL.
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Fastjeff is dead on it AGAIN!! Dont reley on FLAPPERS ONLY!! Raise your exhaust RISORS!! its okay for exhaust to be in water if has to be, like mine. Install $300 camera with micophone in engine room to HEAR ENGINES TURNING OVER!! You see them also, if you blow a oilcooler line as I did and shut them down before it registers on the gauge!! Some sarters I have found out, my 671 detroits included have enough torgue to turn over the engine, even if you have water in the cylinder!! Check your starters on Lehmans Doug. Recentley had 12 volt bilge pump fail on good side of my boat. 120 volt kicked in,but stll had boat heeled over.as it did on the bad engine side. No storm this time to rock boat. Instead of trying to start good engine, hired mechanic to come down and turn crank by hand!! No water!! Started rite up. SCAREDDOG
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