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Post by CaptWoody on Jan 9, 2012 14:24:35 GMT -6
My 90 HP Merc Saltwater has a water hose connections for a fresh water flush. Should the engine be run (at idle speed) as part of this flush, or just let the water run with the engine off? I've read it both ways, some saying the impeller still remains dry with the flush out hose. Of couse I can add the muffs and run it on that, but the build in hose connection is much more convenient.
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Post by Simple Man on Jan 9, 2012 14:29:11 GMT -6
...some saying the impeller still remains dry with the flush out hose... This. If you want to crank it, put the muffs on or submerge the lower unit in a trough/tub. If you are just flushing saltwater out of the motor there is no need to crank it up though. Just let it flush for 5-10 minutes on the flush connection.
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Post by CaptWoody on Jan 9, 2012 15:13:58 GMT -6
Thanks Simple Man -- keep shaking that bush!
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Post by T-Topless on Jan 9, 2012 17:21:12 GMT -6
You can also run it with the muffs on occasionally. Some (including me) feel that warming the motor helps clean it out.
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Post by CaptWoody on Jan 10, 2012 8:38:54 GMT -6
Thanks Capt. Sounds like I need the muffs on her if I'm going to run it in the driveway. I was told otherwise by the previous owner, but I'm finding out he didn't know a lot about it. LOL I suppose that is normal when buying from an individual.
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Post by T-Topless on Jan 10, 2012 9:16:01 GMT -6
The flush connections does NOT supply water to the water pump down in the lower unit, so running the engine with just the hose on the wash out will ruin the impeller.
You must use Muffs or have the lower unit in water to run the engine.
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Post by T-Topless on Jan 16, 2012 8:49:16 GMT -6
I dug a bit more, and found that Mercury has conflicting information, so I would check YOUR engine's manual! To be safe, I would always use muffs to run the engine myself. How else will water get to the impeller, which is down in the lower unit? I own and have owned many OBs, and have used muffs for 40 years with no issues. 1) The "Flushing The Cooling System" procedure page from the Maintenance Section of the Operations and Maintenance Manual supplied with a 1999 4HP motor, states" NOTE: Do not run the engine while flushing the cooling system." 2) Some Mercury 2-Stroke manuals state:" Do NOT perform this procedure while the motor is running. The water pump may be damaged and severe damage from overheating may result." 3) On the other hand, their online "Engine Maintenance" page says:" IMPORTANT: The engine must be run during flushing ..." and adds: " IMPORTANT: Do not run engine above idle when flushing" www.mercurymarine.com.au/home/service--warranty/service--maintenance/engine-maintenance.aspx4) The manual for a 2003 115hp 4-Stroke says:"Flush the internal water passages of the outboard with fresh water after each use in salt, polluted, or muddy water. This will help prevent a buildup of deposits from clogging the internal water passages. IMPORTANT: The engine must be run during flushing in order to open the thermostat and circulate water through the water passages. NOTE: You can have the outboard tilted or in the vertical operating position during flushing. ! WARNING To avoid possible injury when flushing, remove the propeller. Refer to Propeller Replacement. 1. Place the outboard in either the operating position (vertical) or in a tilted position. 2. Remove propeller. Refer to Propeller Replacement. 3. Thread a water hose into the rear fitting. Partially open the water tap (1/2 maximum). Do not open the water tap all the way, as this allows a high‑pressure flow of water. IMPORTANT: Do not run engine above idle when flushing. 4. Shift outboard into neutral. Start the engine and flush the cooling system for at least 5 minutes. Keep engine speed at idle. 5. Stop the engine. Turn off the water and remove hose. Reinstall the propeller. " forums.iboats.com/showthread.php?t=492747 5) Final confusion: 2003 Merc 2 stroke 90 HP Mercury owners manual says:" NOTE: Engine can be stopped or running at idle speed while flushing the cooling system. Do not flush engine using a water system that exceeds 45 psi."
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Post by T-Topless on Jan 16, 2012 10:05:23 GMT -6
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Post by CaptWoody on Jan 17, 2012 8:34:53 GMT -6
You are right, there is confilicting info! My motor is a two stroke so I'll check that over carefully. Thanks for the link to the manuals as thus far I haven't any manuals on that engine at all!
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Deleted Member
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Post by Deleted on Jan 22, 2012 19:58:27 GMT -6
My problem is when i use the muffs on my 150 Yamaha no water comes out the pee hole talk to rep at boat dealer said don't run motor when using flush connector, hook up muffs and flush connector i was told with two hoses then i can run motor safely.
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