20460344 Volvo.Penta Hexagon nut

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
The following changes are adaptable to the products within the listed serial numbers, and are effective with all products after the listed serial numbers.Table 1contains the new and former software part numbers for this change.
Table 1
Required Software
New Software Part Number Part Name Former Software Part Number(1)
596-3705 Engine Software 572-0840
538-1204
(1) The former part number listed is for reference only and may differ.The new software is available in the form of a flash file through the Caterpillar® Service Information System (SIS). A newer part number may be available. SIS Web only displays the latest available flash file.De-rate Timer Strategy
The alarms signal a de-rate which occurs if a generator set is operated at above rated load for an extended period. The engine de-rates after 1 hour of operating above 100% generator set rating or 90% engine capability. The total accumulated limit is 1 hour within 12 hours of resetting at 12:00 am or 12:00 pm. The yearly limit of times allowed to operate of rated capacity is 25 hours and resets on January 1.When there are 5 seconds left on the hour counter, the engine Electronic Control Module (ECM) sends the 7426-1 through a Diagnostic Message 1 (DM1) over the J1939 Data Link to the panel. The Marine Engine Control Panel (MECP) panels read this alarm and drive a digital output. The PMS system reads this output and adjusts the load accordingly.Panels that are not Caterpillar made can read the 7426-1 over the J1939 Data Link and communicate this alarm to the load management system to adjust the load.Third-party panels can monitor the following counters:
SPN 7426 starts decrementing from 60 minutes. The de-rate induced by this counter resets at 12:00 am and 12:00 pm.
SPN 7719 starts decrementing from 1,500 minutes. The de-rate induced by this counter will reset on January 1 of the following year.That table below contains the explanation of de-rate time display event codes.
Table 2
SPN-FMI Code Event Trigger (Activation Conditions) Lamp Status Time Remaining Before De-rate Activation De-rate Action Event Reset Conditions
7426-18 50 Minutes has elapsed on 1-hour timer at or above 91% engine load capacity Amber lamp activated 10 minutes No de-rate applied 7246-1 active
12:00 am (1-hour timer)
12:00 pm (1-hour timer)
12:00 am January 1 (25-hour timer)
7426-1 59 minutes and 55 seconds has elapsed on 1-hour timer at or above 91% engine load capacity Amber lamp activated 5 seconds No de-rate applied
Digital J1939 signal output is available to external load sharing control 12:00 am (1-hour timer)
12:00 pm (1-hour timer)
12:00 am January 1 (25-hour timer)
7719-17 24 hours has elapsed on 25-hour timer at or above 91% engine load capacity Amber lamp activated 1 hour No de-rate applied 12:00 am January 1 (25-hour timer)
7425-31 1 hour or 25-hour timer expires Amber lamp activated 0 seconds De-rate applied at 1% per second until 20% de-rate is achieved(1) 12:00 am (1-hour timer)
12:00 pm (1-hour timer)
12:00 am January 1 (25-hour timer)
(1) The full rating de-rate will limit the displayed engine load to 90%. Refer to the chart below.