950562 Volvo.Penta Pin

Brakesaver Troubleshooting
There are two operation checks that are fast and need no special equipment. One check is the PULL-DOWN RPM CHECK to see if the BrakeSaver can give full braking force. The other check is the KLUNK CHECK to see if the valve spool in the BrakeSaver control valve has free movement. These two checks give and approximate indication that the BrakeSaver has the correct operation.Pull-Down RPM check
The engine must give rated horsepower for this test to have accuracy.1. Actuate the brakes, put the transmission in NEUTRAL and operate the engine at high idle rpm (accelerator pedal all the way down).2. Make a record of the engine rpm.3. Put the BrakeSaver control to the full ON position.4. Make a record of the engine rpm with the BrakeSaver full on.5. The engine rpm with the BrakeSaver full on must be 150 25 rpm less than the engine rpm with the BrakeSaver off. If the difference in rpm is less than 125 rpm, the BrakeSaver is not giving full braking force. If the difference in rpm is more than 175 rpm, check the air pressure to the BrakeSaver control valve. The air pressure must not be more than 50 psi (345kPa).
Do not run the engine at high idle rpm with the BrakeSaver ON for more than 15 seconds at a time. Let the engine run at low idle with the BrakeSaver off for five minutes to keep from getting the engine cooling system too hot.
Klunk Check (check for free movement of the valve spool)
1. Run the engine until the truck air system is at its maximum pressure and then stop the engine.2. Put the BrakeSaver in the full ON position before the air pressure in the truck air system gets below 70 psi (480 kPa).3. Put the BrakeSaver in the OFF position. A noise ("klunk") must be heard at the BrakeSaver control valve as the valve spool hits the cover at the air inlet end of the control valve.4. If the noise is not heard at the BrakeSaver control valve, remove and disassemble the control valve. Inspect the valve for: a. A damaged valve body.b. Damaged or worn springs in the valve spool.c. Damaged or worn valve spool.d. Damaged or worn O-ring seals or diaphragm in the control valve.e. Closed holes (small holes to feel pressure, in the side of the valve spool.For specific problems, make reference to the PROBLEM INDEX below.Problem Index
1. BrakeSaver Does Not Give Full Braking Force with the Mode Selector Switch in the MANUAL Position2. BrakeSaver Does Not Give Full Braking Force With the Mode Selector Switch in the AUTOMATIC-MANUAL Position3. BrakeSaver Oil Temperature is Too High4. BrakeSaver Does Not Turn OFF or Become Empty5. Oil Leakage from the Flywheel Housing6. Oil Leakage from the Clutch Housing or Transmission
GAUGE HOLES FOR TROUBLESHOOTING
1. Oil pressure from BrakeSaver. 2. Oil pressure from the engine. 3. Oil pressure to the BrakeSaver. 4. Test point for BrakeSaver oil temperature. 5. Oil pressure to the engine. 6. Air pressure hole from the control valve. 7. Oil pressure to the cooler. 8. Oil pressure from the cooler. Problem: 1 Problem: 2 Problem: 3 Problem: 4 Problem: 5 Problem: 6 Fuel System Identification
(1) Location of FUEL INJECTION PUMP GROUP identification plate on side of injection pump housing.(2) Location of stamped part number for later FUEL INJECTION PUMP AND GOVERNOR GROUPS. Fuel System
Either too much fuel or not enough fuel for combustion can be the cause of a problem in the fuel system.Many times work is done on the fuel system when the problem is really with some other part of the engine. The source of the problem is difficult to find, especially when smoke comes from the exhaust. Smoke that comes from the exhaust can be caused by a bad fuel injection valve, but it can also be caused by one or more of the reasons that follow: a. Not enough air for good combustion.b. An overload at high altitude.c. Oil leakage into combustion chamber.d. Not enough compression.Fuel System Inspection
A problem with the components that send fuel to the engine can cause low fuel pressure. This can decrease engine performance.1. Check the fuel level in the fuel tank. Look at the cap for the fuel tank to make sure the vent is not filled with dirt.2. Check the fuel lines for fuel leakage. Be sure the fuel supply line does not have a restriction or a bad bend.3. Install a new fuel filter. Clean the primary fuel filter if so equipped.4. Remove any air that may be in the fuel system. If there is air in the fuel system, use the priming pump and loosen the nuts holding the fuel lines to the outside of the cylinder head, one at a time. Do this until fuel, without air, comes from the fuel line connection.5. Inspect the fuel bypass valve to see that there is no restriction to good operation.Checking Engine Cylinders Separately
An easy check can be made to find the cylinder that runs rough (misfires) and causes black smoke to come out of the exhaust pipe.Run the engine at the speed that is the roughest. Loosen the fuel line nut at a fuel injection pump. This will stop the flow of fuel to that cylinder. Do this for each cylinder until a loosened fuel line is found that makes no difference in engine performance. Be sure to tighten each fuel line nut after the test before the next fuel line nut is loosened. Check each cylinder by this method. When a cylinder is found where the loosened fuel line nut does not make a difference in engine performance, test the injection pump and injection valve for that cylinder.Temperature of an exhaust manifold port, when the engine runs at low idle speed, can also be an indication of the condition of a fuel injection valve. Low temperature at an exhaust manifold port is an indication of no fuel to the cylinder. This can possibly be an indication of an injection valve with