807252 2 Mercruiser THERMOSTAT, 71°C (160°F)

This Program must be administered as soon as possible. When reporting the repair, use "PI3249" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3249" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
This Revised Service Letter replaces the March 13, 1999 Service Letter. Changes have been made to the Affected Product.
Completion Date
September 30, 1999Termination Date
March 31, 2000Problem
New engine software is now available for 793 engines converted to EUI, for 793B and 793C engines. The new software will increase the service life of the wastegate and low pressure turbos. It will also make the wastegate respond faster and provide a 20% derate for high boost events at all altitudes and a 20% derate for low boost events if below 9000 ft.
Affected Product
Model & Identification Number
793 (3SJ1-56)
793B (1HL1-524)
793C (4AR1-424)
Spare/Reman Engines
3516 MUI 54Z1-99999 (IF CONVERTED TO EUI)3516 EUI 2PD1-15333516B 7TR1-7003516 MUI REMAN 6CL1-99999 (IF CONVERTED TO EUI)3516 EUI REMAN 7CL1-5073516B REMAN 7DS1-159Parts Needed
Dealers will need to order parts for this Program.
1 - 6V1179 * SEAL-O-RING1 - 1549148 * CONT GP (Low altitude only, 0 to 11,000 ft)1 - 1549149 * CONT GP (High altitude only, 11,000 ft and up)1 - 1688620 FLASH FILE (FOR 793C ONLY)*Parts marked with a ''*' are for 793 engines converted to EUI and for 793B engines onlyAction Required
Parts Stock
Remove all 3E-8668, 105-5404, 107-1892, 110-7479, 119-3357, 124-8687, 133-3992, 141-0053, 138-4797, 148-7197 Control Gp from Parts Stock.
Affected Product
1. For 793 converted to EUI, and for 793B engines, replace the personality module, and the ECM seal if needed.2. For 793C engines use ET to flash the new software. Follow steps 3 through 9 below if the 793C truck has a S/N prefix of '4AR'.3. After flashing the new software use ET and go to "Programmable Parameters". You must use ET version 2.2 or higher.4. Go to "Selectable Throttle".5. Selectable throttle defaults to a "zero". This is the value needed for this software to work properly when flashed in a 793C '4GZ' truck. For this software to work properly in a 793C '4AR' truck, change the "zero" to a "one"6. Exit ET and turn the key switch off for 15 seconds.7. Turn the key switch on for 15 seconds without starting the engine.8. Start the engine and take engine to high idle. If high idle can not be reached, the "Selectable Throttle" parameter has the wrong value.9. Steps 6 and 7 need to be performed only once following the changing of a programmable parameter. Steps 6 and 7 must be performed whenever any programmable parameter is changed before the new value will take affect.Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
Parts Stock
Submit one claim for all 3E-8668, 105-5404, 107-1892, 110-7479, 119-3357, 124-8687, 133-3992, 141-0053, 138-4797, 148-7197 Control Gp removed from Parts Stock.
Affected Product
This is a 1-hour job.
Use a '99Z' code for spare components in the serial number field when claiming against a spare engine.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach.(1-Owner Notification)Copy Of Owner Notification For U.S. And Canadian Owners