ok guys question of the day is it normal to have steam coming out the Exhaust on a closed cooled motor took the top haft of the motors down and no sign of water getting into the cylinders     Thanks guys 

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I always get a little bit. More pronounced early and late in the season when the Bay is cooler. If it’s even out both sides and dissipates quickly, it’s normal. If it’s more of a smoke (ie, lingering and thicker) or grossly uneven between port/starboard then something’s up.

Agreed

Matt's questions are right on as to if it dissipates quickly or not.  Steam does, smoke does not... And is it consistent between the port and starboard sides?.....If so, it very well can just be an atmospheric condition thing.  If one is steaming more than the other it could be related to diminished raw water flow (partially blocked thru hull or a clogged strainer, bad impeller, etc)  You can measure the wet exhaust temperature P&S and compare. If you've owned the boat long enough to say that both sides are now steaming and even with change in ambient conditions with change of season over prior years the steam you are seeing now is "new" than both engines may need raw water system maintenance.

Captain  Thomas  ........ while you are in the engine room consider replacing the following items on the raw water pumps . Sherwood  #  10615 k  /  impeller kit  and  Sherwood #  10944  brass  wear plate inside the pump housing   .  Replace  " both items "  not just the impeller  for proper pump operation . The  brass wear plate  has a nominal  thickness of  .196 measured at the center radius when new . 

Sherwood  parts are the Oem spec . Do not use other aftermarket  parts . There is a difference .

How many hours or age of impellers / wear plate have you logged ?

Tim  /  with mighty 427`s

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How many hours you get out of yours, Tim?  I'm doing 50-60 hours per year, changing every other year, and seeing no real signs of wear.

Thanks Tim I replaced the inpellers wear plate and back plate as soon as I got the boat    Thank you 

Tim Toth said:

Captain  Thomas  ........ while you are in the engine room consider replacing the following items on the raw water pumps . Sherwood  #  10615 k  /  impeller kit  and  Sherwood #  10944  brass  wear plate inside the pump housing   .  Replace  " both items "  not just the impeller  for proper pump operation . The  brass wear plate  has a nominal  thickness of  .196 measured at the center radius when new . 

Sherwood  parts are the Oem spec . Do not use other aftermarket  parts . There is a difference .

How many hours or age of impellers / wear plate have you logged ?

Tim  /  with mighty 427`s

-----------------------------------

thanks Matt yes the same on both sides and only after I’m out of the canal and up and running just wanted to make sure seeing I have the motors apart and doing the top end     As alway thanks Matt it’s good having guys that have been there before me  



Matt Cowles said:

I always get a little bit. More pronounced early and late in the season when the Bay is cooler. If it’s even out both sides and dissipates quickly, it’s normal. If it’s more of a smoke (ie, lingering and thicker) or grossly uneven between port/starboard then something’s up.

Don't confuse a little steam on a boat with a car. Boat exhaust is water cooled. Car exhaust is not. You probably don't have an engine issue. Water coming out the exhaust on your boat is in excess of 100 deg F. at speed. If the air temp is 65 or below? Expect steam. Mine steams most of the year at speed. 

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