Low temp readings,gauge

Peter, she might like to service her boat sometimes, instead of having to depend on someone else to service her ummm boat.

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?

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.

You are correct! forvic...

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.

I look when I get home, but that's what I though that hole was there for.

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).

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.

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.

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.

Are those your "Huntin' Nylons"?

Doh!.......

Air.....Only in warm weather conditions...

with a pair of cut off jeans.. Seems to have a nice contrast ,that look..

eljayrx wrote: Mr. Peter " You are harder than my 11 grade Science teacher.. His Name was Mr.Ball. Mr.Ball-Buster.

Ask your brother(s) if you don't understand. Sorry!

Mr. Peter ,I do understand, it!

When the block warms up enough, The thermo opens to allow the cooler water to flow into the block and have the hotter water exit the block.

Like I said- maybe the wording in the book,could be mis-understood?

There is no need to file for a divorce. Small things like this can be worked out..

eljayrx wrote: When the block warms up enough, The thermo opens to allow the cooler water to flow into the block and have the hotter water exit the block.

No, you do not understand. Cold water is always trying to get it. It will fill an empty block. Once it's full, this water is trapped in the block until the thermostat opens. Once this happens the hot water exits, new cold water can go in. The thermostat is the back door out of the engine. The front door is always open, just sometimes the block is at max capacity and raw water gets turned away (by pass).