Home › Forum › Ask A Member › 76 Evin 15 LS lower unit water drains
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fleetwin.
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April 27, 2016 at 4:23 pm #4147
I ran the motor in a barrel and let the lower unit drain the water for quite a while before removing it from the transom to set it on the ground horizontally to grease the transom screws, tilt lock, reverse linkage etc. When later I layed it cylinder end down,water was pouring from a upper drain hole didn’t see exactly where, a bunch of water. Knowing that the water could possibly get into the power head , I quickly raised it up,put it back on the transom and pulled the plugs and turned it over with the owner watching for any sign of water escaping the spark plug holes. Good news ,no water. I probed the drain holes and tried to clear them to no avail. I had planned on pulling the lower unit this fall and do the water pump and clear those pesky lower unit water drain holes ,knowing they are problematic,but he needs the motor this weekend.
Question is ,in the meantime could the water backup enough to get into the powerhead even with the 1/4" drain hole in the 5" extention that is draining perfectly? Jim"Some people want to know how a watch works, others just want to know what time it is"
Robbie RobertsonApril 27, 2016 at 4:51 pm #35573I believe the lower crankcase seal would have stopped all the water getting into the crankcase and combustion chamber. Obviously it can get back into the water circulation areas but it would not hurt anything, since water is supposed to be there, and it would just drain back out when it is put back in its upright position.
April 27, 2016 at 5:32 pm #35576Just double checking. I thought it might flow up through the exhaust covers and into the cylinders,but it didn’t in my case. Owners manuals state that:" never tilt the lower unit higher than the powerhead as water may enter the cylinders causing damage " (something to that effect)
"Some people want to know how a watch works, others just want to know what time it is"
Robbie RobertsonApril 27, 2016 at 6:57 pm #35583Water flowing up into the cylinders through the exhaust ports has been warned about forever it seems. And people still don’t get the message. My, how many times have I witnessed people unclamping a motor and lifting it off the transom and up onto the dock with the lower unit higher than the powerhead. A true invitation to disaster in a salt water environment.
April 27, 2016 at 7:04 pm #35585Read Warning from 1947 Champion owner’s manual:
upload images freeApril 27, 2016 at 7:15 pm #35587Well OK, I will admit that the threat is lessened on some newer motors with inner exhaust tubes. But why take the chance.
April 27, 2016 at 9:36 pm #35596The little hole in the extension housing is only for the driveshaft tube. The water that dribbled out of the exhaust reliefs is trapped in the "wall of water" that surrounds the inner exhaust tube in the exhaust housing. Water trapped here will not get into the lower seal area of the powerhead. But, there are exhaust relief holes that connect to the "wall of water", so water trapped here could work its way into a cylinder through open exhaust ports if the engine is set down after removing it from the boat. Not real likely, but possible, so I would avoid setting the engine down immediately after removing it from the boat or tank.
You will probably have to remove that gearcase to clean out that pesky water drain on the gearcase, go ahead and enlarge the drain hole slightly as well. Replace that aluminum impeller housing (use the complete water pump kit) when you do the water pump job as well. Be sure to replace the driveshaft oring, and lube the splines with OMC moly lube as well. -
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