Bryan 2530
Well-known member
Does anyone have a heat guage on their yammis? I have everything but.....am I missing something on the display?
Heat guage??
- Thread starter Bryan 2530
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DaleH
FOUNDER of Classic Parker Forum
IMHO best used for 'trends', like typical running temp during start-up, idle running, and cruising speeds. But, NO TEMP gauge will protect the motor from an overheat situation if say a plastic bag wraps itself around the lower unit.
Only gauge that would help in that instance is a water pressure gauge, but you'd need to be watching it routinely to see the pressure drop off from > 20psi to 5 or less ...
That said, I run both a water pressure and temp gauge, but not on a Yamaha motor.
Only gauge that would help in that instance is a water pressure gauge, but you'd need to be watching it routinely to see the pressure drop off from > 20psi to 5 or less ...
That said, I run both a water pressure and temp gauge, but not on a Yamaha motor.
johnsw
Well-known member
That's not a feature that's part of my Yamaha digital guage set, so I added an analog temp guage to my '04 2120 / Yam 150 2-stroke this season. Being a V6 there are actually 2 overheat sensors that Yamaha uses, one on each cylinder head. I used the Teleflex OB temp kit, and an extra sender (and the needed thread adapter). Running the wires and making the dash cutout took the most time. Right now I've only got the starboard cylinder head sender wired in, but later this month I'll wire in the second one when I'm on vacation. Ran 2 wires while I was at it, so everything is just about in place. I'll be hooking the single guage to both senders through an SPDT toggle switch I'll mount on the dash. That way, I can switch between port and starboard cylinder heads if I need to. Today, the guage indicates my engine (starboard head) is running a cool 130 degrees. Right about where it should judging by the thermostat spec's for my engine.
John S.
John S.
DaleH
FOUNDER of Classic Parker Forum
Just be aware that while your gauge 130 'might' be darn close to your actual 130 ... they might not be linear at higher temps. Typical OB temp gauges don't use the 'sense wire' per se, but a dedicated (tested) sender attached deeper into the powerhead near the top cylinder(s). They simply close to ground in a heat situation and I wouldn't necessarily rely upon them to provide an accurate reading ... but that's me. I do agree it is better than nothing and can at least inform you to a 'trend' or if something might be going on.
In most cases, either the sense wire or temp sender into the block is TOO LATE anyway to prevent permanent powerhead damage, if say for example, your LU picks up a trash bag ...
In most cases, either the sense wire or temp sender into the block is TOO LATE anyway to prevent permanent powerhead damage, if say for example, your LU picks up a trash bag ...
johnsw
Well-known member
Just like everything else, there's no perfect solution and boats (just like real life) are all about compromises and what works best for the individual. No water will always be a problem and something to be aware of and catch as soon as possible. If you happen to be looking at a pressure guage, you'll probably be OK. But if you're watching other boats navigating a busy channel or looking at a fishfinder concentrating on something else, there's still the risk it will be noticed after the fact. But then again, maybe not. But, better to have it than not have it.
I use the guage just as you indicated...to spot a trend and what it reads today happens to match my thermostat open temp. It didn't have to work out that way, but the guage, sender and thermostat all seem to agree so it's probably accurate at that point. Anything beyond that is subjective.
The kit I installed uses senders that are screwed into a hole in the top of each cylinder head that originally only had a plug bolt. This puts the sender in the water jacket at the top cylinder of each head. The original Yamaha thermoswitches are still in place and operational so in a sense, I have an early warning system before my red line alarm goes off....as long as I remember to look at the guage. My intent is to use it as a tool. Are both cylinder heads hot? Or is it just 1 side overheating? I got caught with that problem when I overheated doing my spring startup and the water passage in my starboard thermostat housing was blocked with sand, but port side was was OK. Cleaning both out at the time seemed like the right thing to do, but if it's something I need to do on the water to get me home I'll know what I'm looking for.
JS
I use the guage just as you indicated...to spot a trend and what it reads today happens to match my thermostat open temp. It didn't have to work out that way, but the guage, sender and thermostat all seem to agree so it's probably accurate at that point. Anything beyond that is subjective.
The kit I installed uses senders that are screwed into a hole in the top of each cylinder head that originally only had a plug bolt. This puts the sender in the water jacket at the top cylinder of each head. The original Yamaha thermoswitches are still in place and operational so in a sense, I have an early warning system before my red line alarm goes off....as long as I remember to look at the guage. My intent is to use it as a tool. Are both cylinder heads hot? Or is it just 1 side overheating? I got caught with that problem when I overheated doing my spring startup and the water passage in my starboard thermostat housing was blocked with sand, but port side was was OK. Cleaning both out at the time seemed like the right thing to do, but if it's something I need to do on the water to get me home I'll know what I'm looking for.
JS
