Low temp readings,gauge |
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forvicjr
Gold Member Joined: August-24-2012 Location: sc Status: Offline Points: 692 |
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I'll check mine as soon as I get a chance I'll let you guys know what I find. Also optimum temps for these engines is 180* any less is more wear and less power, any more wear rate goes back up and power starts to drop. Wonder why the hell pcm chose the 145* temp? |
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Air206
Grand Poobah Joined: September-28-2008 Location: Roanoke, VA Status: Offline Points: 3000 |
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Are those your "Huntin' Nylons"?
Doh!....... |
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Is your Gun loaded..?
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Mr. Peter "
You are harder than my 11 grade Science teacher.. His Name was Mr.Ball. I use to call him to myself of course. Mr.Ball-Buster. So did my other brothers too. Since I do not have any of those. I kept the tradition alive .. The correct craft book says full circulation through-out the entire engine. Now maybe ,the wording is not exact, in the book as to what really takes place. I guess the mail water pump circulates the water in the block even though the thermo has not opened..? {hence the wording CIRCULATION}? I still like you,very much though-You are very helpful for sure.. Just a country girl, that likes to learn things.I can hunt deer,skin a a snake, and catch frogs, frog legs are good, Ever have them? Also a very good shot with a rifle. Pitty the person that ever breaks in my house..Or tries too. |
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Its easy to pop it in a pot and watch it open and know exactly what it's doing or not doing and at exactly what temps it does it.
Motors running that cold are not running efficiently. The thermostat is there to warm the engine up. and to keep it running at the optimum operating temperature(Not too cold) Anytime the cooling lowers the temp below the t-stat temp it CLOSES to warm up the engine. |
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This is the life
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forvicjr
Gold Member Joined: August-24-2012 Location: sc Status: Offline Points: 692 |
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I feel that the t stat will begin opening before the the 145* mark, 145* would be a full open temp. This would explain the low temps we're seeing. My gauge is on the money as I verified with a laser temp gun. If the t stat partially opens at lower temps this would in fact be a bypass type situation. I do know last year the hotter the lake temps got the hotter the motor got. Mine would even show a difference between hot mid day and night runs. Last year during the hottest days and me hauling a$$ to get five miles up the lake it would barely hit 140* and as soon as I come off plane it would barely read over 100*. What we are seeing I think is very efficient cooling systems. Those that are running higher might have rust scale impellor debre or what not making them run warmer.
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“Tact is the ability to step on a man's toes without messing up the shine on his shoes.” ― Harry S. Truman
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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I'm sorry but I feel you are WRONG!!! Until the T stat opens, no water goes through the block. It's ALL by passed to the manifolds. BTW Lin, please fill us in on your background. You seem to be more informed than the average male here! |
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TX Foilhead
Grand Poobah Joined: February-01-2009 Location: Kingsland TX Status: Offline Points: 2076 |
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I just looked at mine, and realized the hole was not where I thought. I do remember spending some time thinking about how that worked while I was taking it apart, but I can't picture exactly how the hoses were with it off right now.
My temp does move around some, but not as much as you would expect considering the water changes nearly 50 degrees. We get down to the mid 40's and I've seen it up to the mid 90's in August, the motor temp only varies by 20 degrees. |
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 809 |
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it's entirely possible that i'm full of it...i'll see how the temp responds as the season progresses...
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As far as I can tell, I'm not quite sure...
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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Kinda one in the same, but Tim's a little more correct. The "by pass" you are speaking of is really just the supply from the RWP. Once the block is full it's full. Besides some convection most of the raw water is going up over the t-stat and out the exhaust.
And Nick, I boat a lot in really cold water. Once that t-stat finally opens the temp drops drastically then takes a little while to catch back up to ~160 but always does (if doing more than just idling). |
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pmc incorporates a DUAl by-pass system.. Full circulation through out the ENTIRE engine even when warming up.
When the water in the BLOCK warms up enough, then thermo will open or should open.. See guys, I am learning.. This was my pre winter class last year...That is why you drain the block,, because you never know how much water to anti-freeze mixure is in the block...ha ha ! |
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TX Foilhead
Grand Poobah Joined: February-01-2009 Location: Kingsland TX Status: Offline Points: 2076 |
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I look when I get home, but that's what I though that hole was there for.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21131 |
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Are you sure about water bypassing the thermostat? That doesnt sound right to me. Last time I had a PCM Ford thermostat housing apart, I thought I remember that bypass hole existing on the inlet, not the outlet. That would allow the block to fill up regardless of thermostat being open/closed, rather than what you describe.
Chrysler marine engines were set up similar to how the go-fast guys would like. They had dual impeller RWP's, where one path is set up to pull (cold) lakewater and put it through the manifolds- the other impeller pulls warm water from the exhaust manifolds and puts it through the engine. Sort of disconcerting to have one half of the RWP always running warm/hot (same goes for the t'stat housing) but thats exactly what they were meant to do. |
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TX Foilhead
Grand Poobah Joined: February-01-2009 Location: Kingsland TX Status: Offline Points: 2076 |
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The way PCM sets up the thermostat the water can move though the engine and get out with the thermostat closed. The extra cool water may keep it from needing to open, the heater and extra lines for the vdrive could be regulating it to some degree too.
I was listening to the hot rod builders the other day talk about motor plumbing and they were concerned with getting the the forced induction BBC's to warm up enough on the winter. Probably has something to do with the cool water moving faster because of the speeds those boats run. One of the tricks was to cool the exhaust first and then the motor. Unfortunately not an option for us the way our risers are set up. |
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MI-nick
Gold Member Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 809 |
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this may be way off...but i think if you are running with cold water (say 40 or 50 degrees), the thermostat could be OK and temp could still be lower than normal (120 ish). when the t-stat is closed, water still circulates through the exhaust manifolds...which are bolted to the heads and then block. the manifolds stay pretty cold (~60)so the heat from the block will be transferred quickly to the manifolds and the engine would take a really long time or potentially never warm up. since it's an open cooling system, the t-stat can only do so much when the water is really cold. anybody buying this??
the first couple times out this year in my SAN, the temp was 130ish...160ish last summer...the water temp was probably 45...i think the t-stat is fine. |
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As far as I can tell, I'm not quite sure...
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You are correct! forvic...
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Mr.peter. I like to learn about the horse ,I ride on!Plus he is too busy at time chasing down the bad guys of this world we live in!
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Tim everything is in standard Ford locations.The temp does go a little higher if the water your in is higher. I have always wondered why HM eventually added a standard circulating pump,was it to even out the temps? I think this summer I'll check the 'stat and if it checks out ok I might just try a 160. Just looking in my parts book a 140 is listed but does not say what year or engine.The actual pages for my pump set up just says thermostat. A 160 is for '71 and up FW cooled and heat exchanger models,these models having the circulation pump too.
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JDD33
Senior Member Joined: October-20-2012 Location: Natick, MA Status: Offline Points: 499 |
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Interesting, my engine with the HM cooling system is doing the same thing. Last summer I replaced the t-stat and it ran at 140 consistently, then late last fall on the lake it wouldn't crack 100. This spring running on the hose it again wouldn't warm up to 140, I pulled the t-stat and checked it and it opened right at 140 ish, I checked the gauge and sending unit and with applied heat and it read correct. Can the single pump(witha new impeller ) push enuf water to make the engine run cool?
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Old school goin back to school!
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21131 |
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Gary, I assume the HM thermostat location is still in the same place? Where is your temp sensor? One would think that if the water temp at the thermostat has to reach 143 for it to open, that the sensor would be reading that temperature if it were mounted in the same vicinity. I wonder if your stat is faulty and opening early?
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Mine runs about the same,on shutdown rises,on restart goes right back down. I think it's just my goofy cooling system design. I have wondered if I put a 160 thermostat in place of a 140 what it would do. |
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forvicjr
Gold Member Joined: August-24-2012 Location: sc Status: Offline Points: 692 |
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Peter, she might like to service her boat sometimes, instead of having to depend on someone else to service her ummm boat.
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“Tact is the ability to step on a man's toes without messing up the shine on his shoes.” ― Harry S. Truman
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Lin, Since you brother seems to be up with impellers and oil, why not have him do the maintenance? |
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forvicjr
Gold Member Joined: August-24-2012 Location: sc Status: Offline Points: 692 |
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Buffalo, my housing came off over the winter. T stat housing is clear. Over in another thread I was trying to find a t stat. Tested mine and all is good. So t stat and housing is non issue. |
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“Tact is the ability to step on a man's toes without messing up the shine on his shoes.” ― Harry S. Truman
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Usually 2-3 bolts and a gasket.
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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The impeller is doing its job; thus the lower temps. The thermo regulates how much water goes through the engine or bypasses. It's a thermostat not unlike the one in your house.
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forvic--same thing as me...
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Buffalo-- I had the impeller replaced , my brother claims to replace those every 2 seasons...So after that my readings on the temp gauge went way down?
I doubt it was because of that.. Now earlier in the season I was getting uo to say 125 to 135 maybe.. I will have it gone over, thermo housing and all that ,, ty again... |
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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You may need to look inside as well. It's a simple operation. |
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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You need a starting point, and I'd say cracking the thermo cover to see if it's in there at all is a good place to start. A replacement thremostat should come with the gasket. |
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