engine hose wrap

[dlewis812]

motoring from winter storage yesterday (finally). smoke started coming out from engine compartment. after freaking out realized the engine hoses were rubbing one of the exhaust pipes (?).

immediately going to tie off the hoses and would like to add some insulating wrap at that area. also noticed the wrap used in the area of the radiator; other than old does look right?

so question is what's recommended to wrap the hoses?

(most likely going to have these replaced properly but want to make sure ok in the meantime)

thanks

 

[kloudie1]

Yeooww.. sounds like your seawater pump was not working ! That pipe should have sea water mixed into the exhaust and it should not be hot enough to cause smoke from a rubber hose.. The muffler is plastic, so it would be damaged fairly quickly by un-cooled exhaust.. Make sure the engine cooling sea cock is open .. Pull the hose off the intake side of the pump to verify good water flow.. Verify that the strainer is not leaking air and that you have no leaks in the hoses that might let air into the pump.. Check the impeller as it may have been damaged by dry running and not pumping.

 

[dlewis812]

Yeooww.. sounds like your seawater pump was not working ! That pipe should have sea water mixed into the exhaust and it should not be hot enough to cause smoke from a rubber hose.. The muffler is plastic, so it would be damaged fairly quickly by un-cooled exhaust.. Make sure the engine cooling sea cock is open .. Pull the hose off the intake side of the pump to verify good water flow.. Verify that the strainer is not leaking air and that you have no leaks in the hoses that might let air into the pump.. Check the impeller as it may have been damaged by dry running and not pumping.

have had some other issues and "trying" to get the marina to properly diagnose/repair. while i was at it had them go ahead and replace the impeller, hmm.

 

[dlewis812]

Yeooww.. sounds like your seawater pump was not working ! That pipe should have sea water mixed into the exhaust and it should not be hot enough to cause smoke from a rubber hose.. The muffler is plastic, so it would be damaged fairly quickly by un-cooled exhaust.. Make sure the engine cooling sea cock is open .. Pull the hose off the intake side of the pump to verify good water flow.. Verify that the strainer is not leaking air and that you have no leaks in the hoses that might let air into the pump.. Check the impeller as it may have been damaged by dry running and not pumping.

immediately checked to make sure water coming out of the exhaust which is was so therefore had seawater coming in. could it be that it's not enough? which again could be something that happened when they put in the new impeller?

 

[kloudie1]

May have had an air pocket that took a while to clear after they changed the impeller. That pipe should be cool enough there to put your hand on it without burning you. It takes about 450 degrees F for rubber to begin to smoke. That pipe should not be above 150F or so and usually much cooler .. Should be carefully looked at to make sure something is not starting a fire.

 

[Herrick18911]

Ok, you have water coming out the tail. That's a good sign. How did the engine sound? Was there a lot of engine noise, a deep sound like an airplane or car motor? If so, not enough cooling water being pumped through. The only time I have had smoke in the engine compartment it was from the mixing elbow which was cracked and letting out the exhaust gasses before the water was injected in to the exhaust. Those elbows are susceptible to corrosion and need to be checked for leaks. I suspect this might be the cause of your smoke - diesel and rubber smoke are easily confused.

Tod

 

[dlewis812]

plenty of sea water!

can rule out the pump as a problem

 

[Herrick18911]

Can you see where the smoke is coming from? I stand by my diagnosis as a hole in the mixing elbow before water is injected into the exhaust.

Tod

 

[dlewis812]

Can you see where the smoke is coming from? I stand by my diagnosis as a hole in the mixing elbow before water is injected into the exhaust.

Tod

Going to run it again. However when it happened I was at the helm. Another on board while looking for it visibly saw the smoke from the hose where it was touching the hose. Once moved it it stopped.

 

[Herrick18911]

Those exhaust hoses going into that box, which I assume is the muffler, are secured by hose clamps (as they should be). In one picture the 2 clamps look rather far apart. Usually the clamps are side by side. Can you check to see how tight the clamps are and see how secure the hoses are on the muffler? Is one of the hoses red? Is that actually the color of the hose? Is it painted? Taped?

Tod

 

[dlewis812]

properly tied the 2 hoses together and away from the elbow pipe (red). ran the motor at idle at high rpm's for about 15/20 minutes. no problems, red pipe just barely warm to the touch etc. inspecting the hose there is definitely a burn mark where it was touching the pipe. maybe it was just the new impeller getting worked in?

on another note, seems a strange way to run these hoses. hard to tell from the photos however instead of twisting them around the red pipe (what is the correct term for this anyway?) why not take them on the opposite side of the motor and then around behind the pipe. there's plenty of room that way. very soon going to have these hoses replaced so possibly will look into that.