Where/how to put a cyl. head temp sender?

[saumon]

With my fishing rig, i do a lot of fast (4-5mph) shallow (2'-6' ft) trolling in weedy areas so i sometime pick up debris and, in the past 6 years, my '93 60hp 2-stroke had a couple of overheat episodes resulting mainly from the telltale being completely blocked.

Now that i've rebuilt it, cause compression was going south (cylinders were scored), i want to avoid the same situation and i add a water pressure gauge, but it's not the end of all. If, by example, the water discharge get clogged again, i know the pressure will remain high but the engine will still overheat so i also picked up a 60?-220 cylinder head temp gauge

They recommend to put the sender on the upper head bolt but, as you may know, those triple were ?blind holes?, i.e. they don't have a removeable head, so there's no bolts and, unlike the 75-90hp, they don't even have a removeable water jacket cover.

Where should i put the sender? It's a contact type and the bolt is only for holding it against the block. I can drill and tap a hole but i don't want to screw the water passages...There's bolts on the t-stat cover but my thoughts are this may be too cool there...

Any ideas?

 

[donzi gt230]

Re: Where/how to put a cyl. head temp sender?

How 'bout drilling into the fitting where the tale tell hose connects or using a different fitting if necessary. You could drill & the tap the fitting and bend the sensor tab as needed or add a tab to keep it pressed to the block when bolted to the fitting. The other that comes to mind would be a bridge shaped piece of metal epoxied to the block-drill & tap (or use a nut) right in the center, slip the sender under the bridge and use a bolt through the bridge to push the sender against the block. Heck, you could probably just hose clamp it to the brass fitting, that's getting the hot water on exit right?

 

[saumon]

Re: Where/how to put a cyl. head temp sender?

That brass fitting is for the water pressure gauge, it's not the tell-tale, so no water exit there, but i like the idea of the sender bracket held against the block by the fitting.