Installing an Audible Overheating Alarm

Thanks for the vote of confidence Trucky!!! haha

Actually an engine temp alarm is one thing I didn't actually have fitted to the old 4.2TD. I had EGT gauge with 2 different sensors, coolant temp gauge (in top radiator hose) and an oil temp gauge with sensor in sump. I had alarms for low water & oil pressure.

On the Chev I have oil pressure and low water alarms as well as one for the doors on the cargo box (after my mishap in Alice Springs...haha).

With the external temp alarm sensor, I would suggest it be bolted to a suitable size piece of flat steel plate (say 3mm thickness) which can then be bolted to the head, possibly using one of the bolts that secures the rocker cover in place.

On the Chev, I haven't bothered whacking a hole in the sump to mount the oil temp sender, so I've done what I consider to be the next best thing and mounted the sensor in a blind hole in the block. It was a threaded hole just ahead of the starter motor and had no apparent use. The brass sender unit fitted up neatly after I filled the hole with grease first (to transmit the temp to the sender). It registers around the 90o mark most of the time when I'm on the hwy.

Good luck.....

Cheers

Roachie

Doug

the above link is for a low coolant level alarm, I think what the original poster was after was a high temp alarm IMHO

Cheers ob

Mike & All,
Having worked in the aircraft industry for the past 18 years - please let me offer some advice. Heatsink compound is used extensively within, mainly the avionics side of things, throughout various aircraft types. The mistake many people make is that "more is good". Not so. A VERY THIN film of heatsink compound is the go. Anything more, defeats the purpose by starting to insulate against the heat - the very thing you are trying to measure! Trust me, there is chapter's in aircraft publications on this very subject!

Cheers, Matt.

You are quite correct Matt, thanks for the correction.