08-15-2011 11:57 PM
So we have a problem onboard with our 3516's. Crankcase pressure exeeds on one of our engines and we keep thinking this is because of the air pressure in the engineroom. Its only like 6 mBars in differential pressure, but the other three only have about 1-2 mBar. So something seems wrong.
Ive read that the sensor calculates the differential pressure between inhouse crankcase and outside the egnine.
The thing is that we have 4 engines and the one closest to the air inlet in the engineroom has a larger diff than the rest of them. Does anyone know how high the pressure should be in the crankcase. I believe also that there will be a different value if you let the sensor read the outside air pressure, instead of the inside, engineroom pressure. And could this be a solution to the problem?
But mainly Im concerned about the air pressure in the engineroom. Does Caterpillar have any reference values of some kind? How high pressure is recommended?
03-06-2012 04:21 PM
1 simple sweep the sensors with other engine and check.
2 check oil level in sump (exsassive oil make more pressure and normally crenkshaft seals make leak)
3 if u have cat ET connect and calibrate pressure sensors with atmospharic sensors.
4 check in monitering system set point for high crenkcase pressure.
if still problem then u need blow bay test and overhaule the engine.(compression is leaking from IC chamber to sump)