MY BUS STOPPED RUNNING! any suggestions

[chriss]

My 4104 has a mechanical oil press gage installed back on the engine. I'm positive this was the way it was built because there are references to it in the MM and I assumed that all buses have them??

Presumably it was installed there for the use of mechanics working on the engine since there are starter and run switches there also.

Yes, I have one in the back above the engine, but it is broke. I'll end up pulling that out and replacing it.
Chris

[chriss]

If he didn't have oil pressure as much as he has started the engine it would be a basket case by now

No need to scare the guy.

He said his dash gauge is reading normal as it always has. More than likely, that means that he has not lost oil pressure.

Yes, he replace the mechanical gauge in the engine compartment. But it still sounds like a sensor in the safety shutdown system is causing the problem. I'd start with the temp sensors. They're easy to get to.

craig

is it common for the shutdown valve itself to go bad? is there a way of checking it, because maybe the valve itself is bad. just a thought.
Chris

[JackConrad]

is there a way of checking it, because maybe the valve itself is bad. just a thought.
Chris

Start the engine with the wire to the low oil pressure sender disconnected. With the engine running, with oil pressure (and air pressure for engine stop), connect the wire to the sender. If engine stops when wire is connected, sensor is bad.  Jack

[chriss]

is there a way of checking it, because maybe the valve itself is bad. just a thought.
Chris

Start the engine with the wire to the low oil pressure sender disconnected. With the engine running, with oil pressure (and air pressure for engine stop), connect the wire to the sender. If engine stops when wire is connected, sensor is bad.  Jack

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thanks Jack!