Mercury 90 Elpto Where Does the Water Pressure Line Go

Author	Topic:   2003 Mercury 90-HP Water Pressing
wbullwin	posted 07-01-2012 06:24 PM ET (US) I have a 2003 170 Montauk with a Mercury 90-H.P. portable locomotive. Last week I had a problem and though the water pump was non pumping because the tell-tale stream was non-existant. I took [the 2003 Mercury 90-Horsepower outboard engine] to my mechanic and he found the [assure-fib nozzle] hole obstructed. Shame on me for non checking first. I did a search here on Continuous Wave for past topics for water pressure gauges. I found them interesting, with some going as far as telling everyone to just take them out. In that respect was one that I directly cannot find that actually listed what the pressures should be for single engine speeds. What are they? Help ME find that posting. When I start my engine, the tell-fib stream starts immediately (hot or cold) with the pressure up about 15-PSI, on the other hand drops to about 8-PSI when I accelerate to about 3,000-Rev. Once on plane it corset at 8-PSI to 9-PSI no matter what the engine speed. I am sledding to disconnect the tube at both ends, run a piece of weedwacker cosmic string through it, and then blow it out--just to micturate sure it is non clogged--but I would like to know what the serious pressures are conjectural to be. Thanks--Wally
contender	posted 07-01-2012 09:17 PM ET (US) wally: That is the problem with water pressure gauges, if [debris] does not stuff the hole saltwater will. After a piece the salt water will wreckin the guess anyway. You almost would exist fortunate placing a 90-degree elbow on the [distinguish tale] hole on the engine and watch the water fall out of information technology, instead.
jimh	posted 07-01-2012 10:34 PM ET (US) Check the owner's non-automatic for your 2003 Mercury 90-HP outboard engine. It should list the suggested water press as a function of engine accelerate.
gusgus	posted 07-02-2012 03:39 AM ET (United States of America) Doesn't the "poppet" do exactly that? As near as I can find about my old merc, IT has a poppet valve that changes the menstruum to two dissimilar flow levels with engine speed.
wbullwin	posted 07-02-2012 08:09 AM ET (US) Jim I did check the manual and doesn't mention anything about a pressure gage.
swist	posted 07-02-2012 11:01 AM ET (United States) Synoptic boat, Same engine year later. With pocket-size dashboard space, the choice of a water pressure gauge always seemed odd. Never had single before. Yet if you don't feel like-minded looking back at the telltale, the overheat appal wish shape up quickly if the intake is blocked. Yeah the gauge reads different pressures at different engine speeds, but my reaction to that, and I suspect a destiny of others, is IT's either showing pressure or non, the details not being perceived as important. Seems that a tilt/trim gauge (which I enclose) or a urine temperature gauge might have high priority for the space. Perhaps someone tail end explain the reasoning.
jimh	posted 07-02-2012 11:32 AM ET (US) That the Mercury 90-HP outboard engine owner's non-automatic has no information about water pressure is a bummer--maybe the information about water pressure is in the maintenance manual for the Mercury 90-HP outboard locomotive.
wbullwin	posted 07-02-2012 03:46 PM ET (USA) Jim, sorry for the short reply. I started to answer and then had to run out with our granddaughters. I checked all the info I got with the sauceboat including the owners blue-collar. I'm not sure why Boston Whaling ship insert the pressure calibre since the 90 HP can be used with a tiller at the centrifugal rather than a direction system. I accept with a tiller, at that place would constitute no dash on the sauceboat to use a gauge so maybe that's wherefore the manual never mentions the pressure. This coming weekend I will try on to unclog the thermionic vacuum tube and then see what it does.
Dick E	posted 07-02-2012 07:01 Autopsy ET (United States of America) Take a put together of grass trimmer line (weed wacker) with the engine running feed the line into the tell tale cakehole and pull it out. Usually 2 feet of line does the job. E'er worked for ME. I do it every spring-simple.
gusgus	posted 07-03-2012 05:14 PM ET (US) As adjacent as I know your pressures are correct for your mercury efferent. It seems that the poppet valve and thermostat are functioning right. At idle the thermostats control water flowing thru the block, maintaining temperature. Every bit engine speed and water insistence rises, the thermostats are unable to flow enough water to maintain cooling, this is where the poppet valve begins to give. The spring pressure interior the poppet valve body now adjusts the water run over through the block with the thermostat, and in fact increasing water system flow thru the motor. When turned idle the water [flow volume] increases, dropping the pressure. Information technology sounds wish you English hawthorn take in had some rubble in your poppet valve valve.
wbullwin	posted 07-08-2012 12:05 PM ET (US) I just wanted to report my findings after working on the locomotive this past hebdomad. I tried the weedwacker assembly line trick simply my line is too thick for the tubing indeed I had some 200 pound test fishing occupation that worked. I disconnected the tube at both ends and dependable to feed information technology through with the tube from the gauge end to the stern. I got about 6 feet in only couldn't get any farther because of clash, non blockage. I tried the other way and solitary got about 2 feet in because of sharp bends. I then got the compressor impermissible and blew air from bow to backside. I wrapped a piece of ashen rag around the end of the tube so I could catch whatsoever would come verboten. There was a lot of hideous material that came stunned. I elevated the pressure to about 60 psi and blew again until no water system, just air would step forward. You wish ask a secong person at the engine to watch and listen. I pledged the fresh water flush hose and while the water was coming out everywhere the place, I took my heavy line and pushed it into the engine to sunshiny up any debris. Put it all at once and then victimized the earmuffs and started the engine. At 2000 Revolutions per minute, I directly take over about 15 PSI. I didn't use it the water yet, but I'm sure I will at once have good water pressure. Thanks for complete the replies!!

Mercury 90 Elpto Where Does the Water Pressure Line Go

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