Milky Oil |
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3592 |
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Posted: September-17-2019 at 3:45pm |
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MrMcD you were correct. This weekend I pulled of the exhaust hoses an sure as you said it a collapsed hose. Completely caved in solid. I cant believe you cant tell anything is wrong from the out side.
Our Buddy Pete nailed the collapsed hose before I did. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Regarding the impeller:
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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It originally overheated due to the impeller
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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The exhaust tube was definitely collapsed. The outside of the tube looked normal. It is completely blocked!
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Plus 1 |
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RealDeez
Senior Member Joined: August-01-2019 Location: MI/IN Status: Offline Points: 125 |
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If it was just the thermostat the exhaust would still be getting water and the pipes wouldn't have melted... I think that's why there's still a question. RWP problem or something maybe.
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Lake James, IN
93 Sport Nautique |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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Wasn’t it a backwards thermostat?
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3592 |
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I forgot about the oil being better, do we know why it overheated and burned the exhaust tubes yet? It would be a shame to install new tubes and burn them again.
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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Thats usually unlikely, I have grasped at that straw a few times without catching it. However depending on the still relatively sketchy order of events. If you had blocked off exhaust manifolds on a commander and had fixed whatever was causing the first overheat (which was water flow related if the hoses melted, and not due to a faulty thermostat that would have heated the engine but not the exhaust hoses) you very well could have enough water back up enough to settle in the exhaust ports and make its way into the crankcase. |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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I thought that was solved—oil change after high bilge water?
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3592 |
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Glad you found that and maybe the collapsed hose shut the engine down before it was damaged. That is what they were designed to do. They used to be the USCG standard but the standard changed some time back and newer boats no longer have collapseable hoses. Now for that milky Oil. Any cause discovered yet.
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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MrMcD you were correct. This weekend I pulled of the exhaust hoses an sure as you said it a collapsed hose. Completely caved in solid. I cant believe you cant tell anything is wrong from the out side.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10652 |
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This may be rather silly of me, but there have been 29 posts in this thread with nobody asking how hot your engine got.
So i'll ask, how hot did it get? Was it billowing steam out from the engine box/exhaust or did you just notice the temp gauge going up? Smell like hot rubber? Your earlier threads dealt with a bad impeller and overheating at idle, how hot were these temperatures at the time? |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13510 |
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Could be a cracked intake manifold letting water into the oil.
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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Thanks guys. I have learned a bunch!! I hope it is just a hose collapsed!!
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Absolutely!! |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Mark, Yes, it's a Commander. The 70's were pretty lean years for CC with lots of cash $$$ flow problems so they bought what engines they could. Go back a few years and it was standard to offer 4, 5 or even more brands of engines. Also many models had the OMC upgrade option. |
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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Remember I just bought this boat. I think that sticker is most likely the real problem with it. It is coming off. lol Go bucks!!!
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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Ohio guy with the block M?
Go Blue |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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Whew. Dats a sweet ride you got der!
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3592 |
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Your marine conversion looks differant than my 78, mine was a PCM yours looks to be a Commander, they both work fine' I am just wondering why Nautique would use two sources for engines in the same model year. Good Luck finding the problem.
Nice Looking 78! |
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Andrew, Click on the full reply icon above. It's the arrow pointing northeast. Then click the image upload icon. It's the tree with the up arrow. Then a browse box will come up allowing you to select anything off your computer. Mobile devices don't work very well with the site. |
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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Thanks for your help guys. before any of this the engine ran like a sewing machine. Ill check all the hoses for collapse and top of cylinders for water. Wish I knew how to post pics on here. The boat was a one owner is all original.
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3592 |
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The only way to know is the fix the problem and find out what you have after the repair.
Hard to say where the water came from we would only be guessing. You need to check it out and learn what you can. The biggest danger from taking on water would be HYDROLOCK. If water is on top of a piston and you hit your start key it can bang the piston against the water compressing the water against the cylinder head. This can bend a connecting rod and then you are in to a full rebuild. If you hit the starter and your engine spins but then locks pull the spark plugs and let the water out before ever hitting the start key again. The exhaust tubes are pretty strong and not easy to pull off. Warm the exhaust hose up at the connection with a Hair dryer, Warm hoses are much easier to work with. Have a squirt bottle with strong soapy water. Slip a small flat blade between the exhaust manifold outlet and the exhaust hose and run soapy water inside. Work your flat blade around and keep adding soapy water inside. Pull it off the exhaust manifold. If it is collapsed it will be collapsed very close to the exhaust manifold where the heat is the hottest. When you look inside you will see the tube collapsed and burned rubber. They stink when this happens you can smell that the tube gets hot when the engine overheats. |
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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I'm not sure where water came from. plug was in the boat.
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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Also what is the correct thermostat for this old 78 351 commander? I m sure I put it in correctly. Someone stated that without a thermostat and running at idle for a long period of time in cold water can cause water in the oil. Below is what they described. we were running at idle in no wake zones for a while in cold water but am not sure how that will allow water in engine
1. Water in boat bilge Boat has been submerged or bilge water was high enough to run in through dipstick tube 2. Water seeping past piston ring or valves Refer to "Water in Engine" ("On Top of Pistons") 3. Engine running cold Defective thermostat, missing thermostat; prolonged idling in cold water 4. Intake manifold leaking near a water passage Loose or cracked intake Bad intake gasket Corroded head or intake 5. Cracked or porous casting Check cylinder head, cylinder block, cylinder walls, and intake manifold 6. Valve cover cap or breather missing, ( only gets water when it rains) |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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I think you’re figuring it out with our help. The exhaust hoses collapsed. This killed your power. The high bilge water probably led to the milky oil.
Fix: Change exhaust hoses Change oil Enjoy the waning days of Summer! |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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The water would need to be higher to get into the oil. Where did the water come from? |
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Evilsizer
Groupie Joined: August-29-2019 Location: Ohio Status: Offline Points: 62 |
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MrMcD what you just described is what seems to ne happening. Boat has no power and exhaust sounds funny. Will this engine need to be rebuilt now since water has ran through it?
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