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Wartsila’s User Group Forums 50 SG Engine Peak Pressure Sensor – 50SG

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    Upper Michigan Energy Resource Corp (UMERC) recently went commercial with ten 50SGs.  We’ve been going through what seems to be a plethora of cylinder pressure sensors (Wartsila PN 5063376, PAAF454764).  For other 50SG facilities, how many pressure sensors do you keep in stock and what is the lead time to get replacement pressure sensors?  Also, is the peak pressure sensor failure common or is UMERC experiencing infant mortality of the sensors?  Thanks much.

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    <p style=”margin: 0in 0in 0pt;”><span style=”font-family: ‘Arial’,’sans-serif’; font-size: 10pt;”><span style=”color: #000000;”>Cylinder pressure sensor</span></span></p>


    We have 20 in the spare parts which 10 belongs to Wartsila and 10 to us. There is a new design for the peak pressure sensor, you should try to get that one.

    Its better not to buy too many since the design on them is not final yet. Also, before to change the sensor make sure there is no issues with the cabling, we found that our female connectors where the pins weld to the cable had no protection “heat shrink tubing” and at one point the cables were shorting out inside the female connector, we had to open all the cables in all the engines to do inspections.

    Try to clean the contact in the connector with contact cleaner and add some dielectric grease before replacement, sometimes is just a connection issue. We clean and add dielectric grease every time one is replaced.

    So far the peak season is starting at the plant with hot temperatures, this is when we have more issues with them.




    When we first started we were going through sensors at about 3-4 a week.  Kept arguing with WNA until the design changed.  they are currently on rev 3, and there is a way to tell which rev of sensor you have but I cant find my documentation on how that is done.  Maybe someone else has it.  With Rev 3 we started to slow the rate of usage down, but it wasn’t until we had WNA come out and re tune the engines did we stop using sensors.  After tuning we are down to about 2-3 per year.


    I am down to just keeping 6 in stock


    Thank you for the responses – UMERC received Wartsila Parts Notice WS23P471 regarding a new type pressure sensor.  The new sensor type code is 6635Axxxx or 7635Axxxx.  The notice also included the instructions below.

    <p style=”margin: 0in 0in 0pt;”><span lang=”EN-GB” style=”mso-ansi-language: EN-GB;”><span style=”color: #000000; font-family: Calibri;”>From TS:</span></span></p>
    <p style=”margin: 0in 0in 0pt;”><span style=”color: #2f5597; font-family: ‘Arial’,’sans-serif’; font-size: 8.5pt;”>The de-rate of the engine is as it should be since the upper load level is controlled by the cylinder pressure sensors and if one have a failure, the load will be de-rated until the problem is solved.
    What should be checked is the behavior of the pressure sensor, since sometimes there is a small sooth build up that can affect the sensor and the pressures starts fluctuating.
    There is a spare parts notice WS23P471 (attached) which informs on a newer version that is more resistible to higher pressures and vibrations.
    If sensors failing they should be replaced with new version.
    According to system it shows that the engines were delivered with other version and should be checked on marking of the sensor according to the WS23P471
    The test mentioned should also be done before changing the sensor.</span></p>

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