I am getting to know our new to us 94 U-240, and I found a temperature probe between the turbo and the Pac-brake. The tube leads to what looks like a sensor on the inside firewall, with a green wire that disappears into the loom. Is this part of the engine or trans management system, or am I missing a gauge?
Cat 3116 and MD 3060
Matt B
94 U-240
bump! Someone go out and lift up their bed!
Matt B
Matt,
I think that's a aftermarket add-on to your coach. It's call a pyrometer and should feed to a gauge on the dash. It's usually used on diesels that have been "souped-up" to let you know when to back off on the throttle before you damage the engine. I don't know of any Foretravels where this was standard equipment.
An EGT (exhaust gas temperature) gauge was one of the things I added to our U270 (got it from Banks). (I think Barry Leavitt has one also.) I use it as another indication about when to slow down on a long hill climb, and also to tell when it's safe to shut the engine down without toasting the oil in the turbo. Also good as an early indication of a misbehaving engine, although I haven't had any misbehaving (e.g. engine running too rich) so far after installing it. Probably what it really is, is "comfort food" for the gauge junkies among us :))...
Not OE (Original Equipment).
We had a pyrometer on our recently-sold Safari Trek, and it was my main gauge for mountain climbing. When the temperature hit 1200, I would downshift to keep things from cooking. Would like to have the feature on the FT.
I will try to trace the wire on the FT when I am out there again. The installation looks professional or factory, and the wire from the sensor disappears into one of the looms.
Cummins Data: Max Turbo Temp in/out of exhaust side 1400f inlet and 1200f outlet. Much above these limits and the valves start to flow out the exhaust in liquid form.
I try to stay below 900 at the turbo outlet (I installed the pyrometer in the exhaust pipe after the turbo). The Cummins tech I talked to said stay below 1200 before the turbo, and there would be about a 300 deg drop through the turbo. So that's consistent with Dave M's data, with a little safety margin.