874951 Volvo.Penta Oil pressure gauge, Reverse Gear

Problem
Pistons may scuff in the liners of certain 3508, 3512, and 3516 Engines due to improper combustion especially during cold starts. The new governor control reduces the fuel used during start-up. The new water temperature regulators and the change to the regulator housing will help maintain cooling system temperatures both during engine operation and while heating with jacket water heaters. The jacket water heaters or ether starting aid systems will provide improved starting with smooth combustion. All of these items will help prevent piston scuffing.
The use of a starting aid (either jacket water heaters or an ether starting aid system is recommended on any 3508, 3512, or 3516 Engine which is operated in air temperatures of 13°C (50°F) or lower.
Affected Product
Group 1
Model & Identification Number
3508 (23Z1535-3018)
3512 (24Z1736-3155)
3516 (25Z916-1866)
Group 2
Model & Identification Number
3508 (23Z1535-3130)
3512 (24Z1736-3265)
3516 (25Z916-1937)
Group 3
Model & Identification Number
3508 (23Z1535-3164)
3512 (24Z1736-3325)
3516 (25Z916-1942)
Group 4
Model & Identification Number
3508 (23Z1535-3475)
2512 (24Z1736-3690)
3516 (25Z916-2141)
Parts Needed
Group 1
4 - 7E7933 Regulator4 - 3S9643 Seal1 - 7N4927 Gasket2 - 3N3008 GasketGroup 2
1 - 7E5253 Governor Control GroupGroup 3
1 - 7F9504 Plug4 - 3S9643 Seal1 - 7N4927 Gasket2 - 3N3008 GasketGroup 4
If installing jacket water heaters:
All Group 4 Engines
2 - 7E6249 Heater (120 v)or2 - 7E6248 Heater (240/480 v)Plus the following for 3508 Engines
2 - 1S0724 Clip2 - 7K3377 Pipe2 - 0S1619 Bolt4 - 5M2894 Washer2 - 9S8752 Nut1 - 5N1649 Hose As.1 - 6H8297 Elbow1 - 6F0496 Tee1 - 3M7045 Plug2 - 5P0598 Clamp1 - 5N5988 Hose As.2 - 6B9081 Bushing1 - 4P4774 Bracket A.2 - 2H3745 Bolt2 - 5P8250 Washer2 - 8V2636 Spacer1 - 2R7712 Coupling1 - 7C1707 Bracket1 - 0S1571 Bolt2 - 9F7716 Clip1 - 5N1649 Hose As.2 - 5P8250 Washer2 - 9S1368 Bolt2 - 1S2303 Spacer2 - 5P0598 Clamp1 - 6F0496 Tee1 - 3M7045 Plug1 - 2B0858 Plug1 - 2R7712 Coupling1 - 8N0855 Hose As.1 - 043935 Elbow1 - 8N8550 Elbow1 - 7N4945 Gasket3 - 0S1594 Bolt1 - 5B4855 Bushing1 - 6H8297 Elbow2 - 8S5107 Spacer2 - 0L1329 Bolt2 - 5P8245 Washer1 - 1L4031 Tee1 - 6B9081 Bushing1 - 5F6371 Connector7E6249 Heater or 7E6248 Heater plus the following for 3512 Engines:
2 - 1S0724 Clip2 - 7K3377 Pipe2 - 0S1619 Bolt4 - 5M2894 Washer2 - 9S8752 Nut1 - 3N7223 Hose As.1 - 6H8297 Elbow1 - 6F0496 Tee1 - 3M7045 Plug2 - 5P0598 Clamp1 - 5N5988 Hose As.2 - 6B9081 Bushing1 - 4P4774 Bracket As.2 - 2H3745 Bolt2 - 5P8250 Washer2 - 8V2636 Spacer1 - 2R7712 Coupling1 - 7C1707 Bracket1 - 0S1571 Bolt4 - 9F7716 Clip1 - 3N7223 Hose As.2 - 5P8250 Washer2 - 9S1368 Bolt2 - 1S2303 Spacer2 - 5P0598 Clamp1 - 6F0496 Tee1 - 3M7045 Plug1 - 2B0858 Plug1 - 2R7712 Coupling1 - 8N0855 Hose As.1 - 043935 Elbow1 - 8N8550 Elbow1 - 7N4945 Gasket3 - 0S1594 Bolt1 - 5B4855 Bushing1 - 6H8297 Elbow2 - 8S5107 Spacer4 - 0L1329 Bolt4 - 5P8245 Washer1 - 1L4031 Tee1 - 6B9081 Bushing1 - 5F6371 Connector7E6249 Heater or 7E6248 Heater plus the following for 3516 Engines:
3 - 1S0724 Clip3 - 7K3377 Pipe3 - 0S1619 Bolt6 - 5M2894 Washer3 - 9S8752 Nut1 - 3N4911 Hose As.1 - 6H8297 Elbow1 - 6F0496 Tee1 - 3M7045 Plug2 - 5P0598 Clamp1 - 5N5988 Hose As2 - 6B9081 Bushing2 - 5P0598 Clamp1 - 6F0496 Tee1 - 3M7045 Plug1 - 2B0858 Plug1 - 2R7712 Coupling1 - 8N0855 Hose As.1 - 043935 Elbow1 - 8N8550 Elbow1 - 7N4945 Gasket1 - 4P4774 Bracket As.2 - 2H3745 Bolt2 - 5P8250 Washer2 - 8V2636 Spacer1 - 2R7712 Coupling1 - 7C1707 Bracket1 - 0S1571 Bolt6 - 9F7716 Clip1 - 3N4911 Hose As.2 - 5P8250 Washer2 - 9S1368 Bolt2 - 1S2303 Spacer3 - 0S1594 Bolt1 - 5B4855 Bushing1 - 6H8297 Elbow2 - 8S5107 Spacer6 - 0L1329 Bolt6 - 5P8245 Washer1 - 1L4031 Tee1 - 6B9081 Bushing1 - 5F6371 ConnectorIf access to an electrical power source for the jacket water heaters is not available, you may install an ether starting aid system.
If installing an ether starting aid:
1 - 7X1078 Nozzle As. *1 - 3B6768 Bushing *1 - 1N3416 Tube4 - 6V2686 Clip3 - 0S0509 Bolt11 - 5M2894 Washer4 - 0L2070 Bolt6 - 7B8167 Bolt12 - 5P0537 Washer6 - 9S8750 Nut5 - 5P9085 Clip12 - 7S1197 Screw24 - 6V9499 Washer12 - 4B2043 Nut6 - 5N6645 Shockmount1 - 9X3207 Control Group*2 - 7C0348 Bracket4 - 0S1618 Bolt20 - 9M1974 Washer1 - 5P0598 Clamp*1 - 9X9584 Resistor Assembly*2 - 7E8961 Bracket8 - 4B3388 Bolt8 - 5S0003 Nut1 - 9X7137 Valve Assembly*4 - 0S1594 Bolt2 - 7C0347 Bracket2 - 7C0346 Bracket Assembly1 - 6B1628 Bushing1 - 7X5988 Switch Assembly1 - 7X1062 Cylinder Assembly *2 - 3T3048 Clip Assembly2 - 3T3045 Clip Assembly1 - 7X1063 Fitting Assembly *1 - 4P2570 Harness Assembly **1 - 8C9812 Switch1 - 4P2569 Harness Assembly ****3516 requires 2**3516 only***3508 and 3512 onlyAction Required
Before or After Failure
Reference Service Magazine May 13, 1991
Group 1
Install low leakage water temperature regulators. See the article on Page 14 of the June 25, 1990 Service Magazine (Page 6 of the July 1990 Engine News).
Group 2
Change 2301 Governor Control to 2301A Governor Control. See Special Instructions SEHS9188 "Installation of 7E5253 Governor Control Assembly."
Fuel Limit/Ramp Time must be set during installation of 2301A Governor Control. "Maximum" fuel setting and "minimum" ramp settings must be set to prevent over fueling at startup. Se the fuel limit initially to minimum and the ramp limit initially to maximum acceptable and then adjust as needed.
Group 3
The hole in the bottom of the top regulator housing that allows coolant from the top housing to drain to the bottom housing when the engine coolant is drained needs to be plugged.
To plug the hole, remove the top regulator housing and tap the 10.5 mm hole (shown in the illustration) to accept a 7F9504 Plug (" standard pipe thread). When installing the 7F9504 Plug in the tapped hole, make sure top of the plug is flush with (or slightly below) the surface of the housing.
9Y9121 Housing (Upper Regulator Housing)Group 4
Install 6kW Jacket Water Heaters. See Special Instructions SEHS9340 "Jacket Water Heater Installation Procedures."
- OR -
If an electric