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Im in the clear lake area, so i go out in galveston bay, texas intracoastal waterway, sometimes the Gulf. I bought the boat from Casey at Legend Marine Group. I did one day see on the boat that once had a sticker from a used boat dealer in Oklahoma.
Originally Posted by BUP
(Post 4491482)
So your in Texas ? and or the boat is curently ? Where did you buy it or from in Dallas ? If in fact was bought in Dallas probably repo boat and from the auction.
\ Salty dog internal cooling systems will have to be checkout very closely. I'm in DFW TX. |
good luck with it. If you end up pulling your hair out completely and parts change half the engine in which can break the bank and problems still exist. I'm half the day road trip away.
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Thank you! Really appreciate it. Im almost to that point. Been fkn with this since may 2015.
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Originally Posted by rocky z
(Post 4491202)
my apologies if this has been talked about but cant find anything on it. background, i bought the boat may 2015, every since then
the boat runs 190 degree and borderlines alarm status. i have changed seawater pump last year to the stainless hardin marine. all the hoses were flushed out and clean. did not see a big difference, this year, same thing, had a thru hull water pick-up installed because the plastic tube in outdrive was in bad shape. also, the hoses, heat exchanger all the coolers have been cleaned twice this year. a few weeks ago, my thermostat stuck closed, when it opened, again to 190. i am in the process of changing thermostat and water temp gauge sender. hoping this fixes it. However, here are my questions. if i use a heat gun to take temps off the motor, water, or ??? where do i aim the laser to get the most accurate reading. and 2, should i change out ECT sensor and the Exhaust manifold sensors too? i know these will also go in alarm. i dont have the scanner and trying not spend another 1500 dollars and not running the correct temp. i was hoping the wrong thermostat was the problem, but a 160 degree was in place. thanks for the help! |
yes sir, i am guessing. i am gonna get a scanner next week. i realized when i see multiple problems with same alarm, its very confusing and frustrating to figure out what it is.
thanks for reply!! |
What is boarderline alarm status ? do you have an actually alarm taking place or just going by that phrase cause your temp gauge reads 190 without having a real live alarm going off ?
The T stat being 160 degrees is completely not the same style / model as what a 454 / 502 big block take here from 2000 and back. You better make sure it is the correct T stat installed for a 496. Like I said you can verify your dash temp gauge with a hand held temp gun - 30 buck tool, to rule in or out for if in fact it is reading correctly. Do you have warning horn going off and engine running in a form % of guardian mode. (restricted / limiting rpms) I say this because EMCT sensors are not going to lower your temps at the dash nor will changing the water pressure sensor - if those faults are taking place you will be in a % of guardian mode. So what rpms can you reach while running full rpm range at WOT ? Just putting forth the question - Scanning for water pressure - if you monitor with the scan tool what are the proper specs for PSI ? If you do not know those specs how does one know if it is low water pressure especially without a current fault ? and if you have low water pressure, the scan tool does not pin point any mechanical cooling issues. What is the plan if you have low water pressure readings ? just asking not being a smart azz but curious. Not dogging you. |
hello, yes it keeps going in and out of alarm. rides 190 but as soon as it goes over the 190 mark, it alarms. gonna use one of those temp guns to get temp. im gonna be honest,
i am not a mechanic, just trying some things to see maybe its something simple. i do plan on getting a scanner but i dont know pressures like you say. tach says about 5100 ish wot |
So your temp rises and alarm comes in at 5100 rpms and goes away -- does the alarm ever happen at rpms say at 4800 and below ???
if the alarm ONLY happens at say 4900 rpms and or above - that is not alarm for overheat as I THOUGHT with the statement of boarderline. That's an OVERSPEED alarm. Hence why I asked to get very clear about. A OVERHEAT alarm will not come and go You have a overspeed alarm at 5100 rpms. lower your rpms with the correct running rpms - 5000 K is max recommended for WOT / 496 HO MAG --- 4800 rpms for an plain 496 Mag. the coming and going alarm is overspeed alarm. Still verify your temps to see how much your gauge is off and or running a hotter than normal spec. You can temp shot with gun at the t stat housing and at the coolant temp sensor to see what the readings are compared at the dash. |
if your alarm was an overheat this PCM 555 496 would never reach 5100 rpms NEVER for an overheat alarm. AGAIN NEVER to stress that issue. Guardian mode would set as soon as the first hundredth of a second sound of an alarm, limiting the engine to 5 % to 90 % available power depending on how hot the engine was getting.
PLUS overheat alarm is a continuous horn fault set. Its called ECT Overheat as a fault. Overspeed alarm is an alarm that can come and go even by a hair push back of the throttle as it still can bump off the rev limiter. So does your temp gauge creep back down or stays at or above 190 ? How much temp swing does the gauge show thru out rpms ? So when the alarm goes away what is the temp reading ? |
i dont always do WOT, the motor gets too hot. here lately i cant even get to 4800 rpms. just cruise at 40-45 mph.
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