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Author Topic:   Proper Engine Flush procedure.

Salmon Tub posted 08-28-2002 02:26 PM ET (US)
I read in a post here that you should not turn the hose pressure up all the way when flushing an engine. Why? How do you know what enough is? I always go at least 2 turns but don't want to damage anything. What does excess pressure do?
Bigshot posted 08-28-2002 02:58 PM ET (US)
Depends on your pressure. If using the factory flush you do not run the engine so no biggie. With earmuffs the pressure will blow the muffs off and or maybe fight the impeller. You just want to have enough water that the water pump can retrieve and circulate. If indicator is slow, pump up the pressure a bit but being the engine is only being flushed and at low rpm's, no need for full power.
Matthew posted 08-28-2002 03:35 PM ET (US)
The recommendation from Mercury on my 2002 2 stroke 90 was not to exceed 45 psi.
Matt
dgp posted 08-29-2002 09:15 AM ET (US)
The service manual for my '01 Mercury 4 stroke gives the following procedure for "Flushing the Cooling System":
"1. Place the outboard in either the operating position or in a tilted position.
2. Remove the propeller.
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 at idle speed.
5. Stop the engine. Turn off the water and remove hose. Reinstall the propeller."
Bigshot posted 08-29-2002 10:36 AM ET (US)
Remove prop? Gotta love the lawyers with that one. What next? Make sure boat is secured with chocks and all children within a 10 block radius restrained?
shoctor posted 08-29-2002 05:53 PM ET (US)
Believe me that is a good thing for the Lothars and people who ate paint chips as kids. Watched a guy ata local marina try and flush a motor at the ramp looked like he knew what he was doing until he had the motor in gear and turned the prop into a hose reel. (not the best part yet) Then tried to pull the hose off with the motor still running by having Wife (also a paint chip eater) put the motor in reverse while he maneuvered the hose. He rethought this idea after almost knocking his hands off leaving him with a name like
Bud "Stumps" McDuff
ShrimpBurrito posted 08-30-2002 01:04 AM ET (US)
Shoctor - that is hilarious.
"CAUTION: Be sure to dismount your engine from your boat before backing into your garage, as props and engine may damage drywall, causing serious injury or death."
bocadrew posted 08-30-2002 07:14 PM ET (US)
sometimes (most times)my engine stalls when I"m flushing it. I keep my boat in the water and I notice that If i lower the engine in the water to reduce noise it never stalls, as soon as I trim out of the water it wants to stall. Am I doing something wrong? 100 hp Johnson......drew
triblet posted 08-30-2002 11:20 PM ET (US)
bocadrew, the tilt is probably screwing
up the fuel system, most likely the level
in the float bowls.
All: You can force water past the seals
by turning the hose on full blast. Been
there. I now only open the hose bib 1/4
turn. I built a gizmo with a pressure
guage, and that gets it up to about 35 PSI.
The Evinrude manual says 50 max.
As BS pointed out, this doesn't matter with
the muffs, but with a direct attach, it
can.
The Evinrude manual says that you don't need
to run the engine if direct attached. My
neighbors appreciate that.

Chuck
Steve Leone posted 08-30-2002 11:44 PM ET (US)
Outboard Backflusher. Ebay Item # 1855534153. Check it out. Steve

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Author	Topic: Proper Engine Flush procedure.
Salmon Tub	posted 08-28-2002 02:26 PM ET (US) I read in a post here that you should not turn the hose pressure up all the way when flushing an engine. Why? How do you know what enough is? I always go at least 2 turns but don't want to damage anything. What does excess pressure do?
Bigshot	posted 08-28-2002 02:58 PM ET (US) Depends on your pressure. If using the factory flush you do not run the engine so no biggie. With earmuffs the pressure will blow the muffs off and or maybe fight the impeller. You just want to have enough water that the water pump can retrieve and circulate. If indicator is slow, pump up the pressure a bit but being the engine is only being flushed and at low rpm's, no need for full power.
Matthew	posted 08-28-2002 03:35 PM ET (US) The recommendation from Mercury on my 2002 2 stroke 90 was not to exceed 45 psi. Matt
dgp	posted 08-29-2002 09:15 AM ET (US) The service manual for my '01 Mercury 4 stroke gives the following procedure for "Flushing the Cooling System": "1. Place the outboard in either the operating position or in a tilted position. 2. Remove the propeller. 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 at idle speed. 5. Stop the engine. Turn off the water and remove hose. Reinstall the propeller."
Bigshot	posted 08-29-2002 10:36 AM ET (US) Remove prop? Gotta love the lawyers with that one. What next? Make sure boat is secured with chocks and all children within a 10 block radius restrained?
shoctor	posted 08-29-2002 05:53 PM ET (US) Believe me that is a good thing for the Lothars and people who ate paint chips as kids. Watched a guy ata local marina try and flush a motor at the ramp looked like he knew what he was doing until he had the motor in gear and turned the prop into a hose reel. (not the best part yet) Then tried to pull the hose off with the motor still running by having Wife (also a paint chip eater) put the motor in reverse while he maneuvered the hose. He rethought this idea after almost knocking his hands off leaving him with a name like Bud "Stumps" McDuff
ShrimpBurrito	posted 08-30-2002 01:04 AM ET (US) Shoctor - that is hilarious. "CAUTION: Be sure to dismount your engine from your boat before backing into your garage, as props and engine may damage drywall, causing serious injury or death."
bocadrew	posted 08-30-2002 07:14 PM ET (US) sometimes (most times)my engine stalls when I"m flushing it. I keep my boat in the water and I notice that If i lower the engine in the water to reduce noise it never stalls, as soon as I trim out of the water it wants to stall. Am I doing something wrong? 100 hp Johnson......drew
triblet	posted 08-30-2002 11:20 PM ET (US) bocadrew, the tilt is probably screwing up the fuel system, most likely the level in the float bowls. All: You can force water past the seals by turning the hose on full blast. Been there. I now only open the hose bib 1/4 turn. I built a gizmo with a pressure guage, and that gets it up to about 35 PSI. The Evinrude manual says 50 max. As BS pointed out, this doesn't matter with the muffs, but with a direct attach, it can. The Evinrude manual says that you don't need to run the engine if direct attached. My neighbors appreciate that. Chuck
Steve Leone	posted 08-30-2002 11:44 PM ET (US) Outboard Backflusher. Ebay Item # 1855534153. Check it out. Steve