Red arrow is your sending unit.
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| Where is the thermostat? https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=13166 |
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| Author: | mark1190 [ Sun Jul 13, 2014 6:26 pm ] |
| Post subject: | Where is the thermostat? |
After changing belts (another thread) I spent some time wiping bits of old rubber of my engine. When I took the boat out for a test run, the temp gauge was flatlined (all the way down)(off the gauge) - never moved. Clearly I inadvertently disconnected the sending unit? Anyone able to tell me where it might be? I don't want to spend my upcoming trips through the San Juans with nothing giving me engine temp. Thanks, everyone here is a life-saver. Mark 1996 FOUR WINNS SUNDOWNER 205 5.0L (fuel inj) |
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| Author: | NiagaraChillin [ Sun Jul 13, 2014 7:00 pm ] |
| Post subject: | Re: Where is the thermostat? |
Red arrow is your sending unit.
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| Author: | mark1190 [ Fri Jul 18, 2014 12:35 pm ] |
| Post subject: | Re: Where is the thermostat? |
Niagra, thanks for the reply. I don't understand a bit of that diagram, I'm sorry. ANy chance you could point me in the right direction from this photo? The thermostat on the dash is just dead. Thanks! 
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| Author: | NiagaraChillin [ Fri Jul 18, 2014 1:06 pm ] |
| Post subject: | Re: Where is the thermostat? |
I can't view your pic on this computer (dang work filters  ), but as you look at your engine from the front, that sending unit should be to your left, in the front area of the intake manifold.
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| Author: | deafwish [ Fri Jul 18, 2014 7:06 pm ] |
| Post subject: | Re: Where is the thermostat? |
^^^ Correct. Almost underneath the starboard side of your thermostat housing (tricky to see!). It will be a brass plug, with an electrical terminal on top... |
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| Author: | crossram [ Fri Jul 18, 2014 7:57 pm ] |
| Post subject: | Re: Where is the thermostat? |
see the wire under the thermostat ? follow that wire should be it |
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| Author: | mark1190 [ Fri Jul 18, 2014 10:23 pm ] |
| Post subject: | Re: Where is the thermostat? |
This wire? Looks like it's plugged into the block. I removed the nut (it was loose) and lost the washer. I used a common washer and put it all back on and somehow stripped the thread on the nut. Now it won't tighten or loosen. AND, now the engine won't start. Am I screwing this thing up royally? Engine just clicks, really fast then slows down to nothing. Dead battery is almost impossible...could I have shorted out something? 
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| Author: | LouC [ Sat Jul 19, 2014 1:07 pm ] |
| Post subject: | Re: Where is the thermostat? |
Not sure what that is (never had a Ford marine engine) but based on the schematic that Niagara posted, the temp sensor should be underneath one of the hoses coming off your thermo housing. Cold reading on marine inboards in my experience about 90% of the time is a sticky thermostat that does not close all the way. It could be a gauge, sender or wiring problem, but I've replaced at least 5-7 'stats over the years for this same problem. A piece of rust gets in the seat. So what I learned: run the boat up on plane, let the engine get at least to 160 where the stat starts to open. Then take a large wrench and tap on the thermo housing, this can dislodge a piece of rust stuck there and lets the stat close. Then it will run at normal temp. If this does not work, you have to change the stat. Your engine is EFI, this should be what you got: http://www.crowleymarine.com/johnson-ev ... /56697.cfm this # 25 is the water temp switch here you go the thing you fiddled with is in the water pump actually....it is also a sending unit...probably for the EFI system.. http://www.crowleymarine.com/johnson-ev ... /56696.cfm |
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| Author: | mark1190 [ Sat Jul 19, 2014 3:40 pm ] |
| Post subject: | Re: Where is the thermostat? |
Thanks for taking a look. Here's a closer shot of it -- is it indeed the sensor? It's screwed into the block (I see threads). And it has a tan wire leading to/from it. I appreciate the feedback. Trying to learn. But I may be screwing this up and making it worse. 1 week to go to our long trip into Puget Sound -- I figured I wouldn't want to do it without a temp gauge working properly. 
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| Author: | mark1190 [ Sun Jul 20, 2014 4:07 pm ] |
| Post subject: | Re: Where is the thermostat? |
Yep, that's the guy. I took a tester to it and when I touched it the gauge popped up and down. Very easy to find, not hidden at all on the Ford version of a Four Winns 205 Sundowner. So on another thread I told you about how, after cleaning what I thought was the thermostat connection, the engine bonked. Just went dead. Turns out it was a starter connection. I had THREE connections go bad within one week: Belts got loose (that started my adventure) because alternator got loose. Thermostat wire was loose. Starter connection loose. Once I got the starter figured it, it all came together - including that gauge. The thermostat popped right on and works. Sometimes, however, those Volvo Penta/Ford machines are so efficient it's hard to tell if the engine even heats up. it rarely ever got to 140 degrees over the years. Usually sits around 125-130 (sea water and cold river water are our two main running sites) I am composing a polite note to the mechanics who worked on my boat the last three years. So disappointed the shop would do such shoddy work (not even putting a nut on the alternator bolt, etc) I pay these guys every year a lot of money IMHO to winterize and make sure all connections are secure. These would appear to be basic maintenance procedures that I pay someone to look after. I've learned a lot in this process. I will always follow up and check these things myself out before I go out on long trips - even if I pay someone to (supposedly) look after them. Thanks, everyone. Mark |
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