1275789 Volvo.Penta Bracket

Measurement Of Exhaust Temperatures
Use the 1U-8865 Infrared Thermometer to check exhaust temperature. Instructions for the test procedures can be found in Special Instruction SEHS8149. These instructions are included with the infrared thermometer.Checking Aftercooler Operation
Use the 4C-6500 Thermistor to check the operation of the aftercooler.Refer to Special Instruction, SEHS8446 for more information about the 4C-6500 Thermistor .Turbocharger
Inspect the bearing for the turbocharger. This bearing should be inspected after 7200 hours or service. This check should also be made if any unusual sound or vibration is noticed in the turbocharger. The turbocharger does not need to be disassembled in order to perform this quick check. Remove the piping from the turbocharger and inspect the compressor impeller. Inspect the turbine wheel and the compressor cover. Rotate the compressor and turbine wheel assembly by hand. Observe the compressor and the turbine wheel by feeling for excess end play and radial clearance. The rotating assembly should rotate freely with no rubbing or binding. The impeller should not rub against the compressor cover. The turbine wheel should not rub against the turbine housing. The turbocharger must be reconditioned, replaced, or rebuilt when any of the above conditions exist.End clearance should be checked with a dial indicator. Attach a dial indicator with the indicator point on the end of the shaft. Move the shaft from one end to the other end. Take note of the total reading on the indicator.End play for the turbocharger should be 0.08 to 0.25 mm (.003 to .010 inch). If the end play is more than the maximum end play, the turbocharger should be rebuilt or replaced. If the end play is less than the minimum end play, carbon may be built up on the turbine wheel. If this is the case, the turbocharger should be disassembled for cleaning and inspection.
Illustration 1 g00320945
Typical example of checking the end play of the turbochargerA more reliable check of the bearing conditions can be made only when the turbocharger is disassembled. The bearings, the shaft journal, and the housing bore diameters can accurately be measured when the turbocharger is disassembled.
Illustration 2 g00320963
Checking turbocharger radial clearance (typical example)Radial clearance can also be checked with a dial indicator. Remove the oil return line from the turbocharger. Attach a dial indicator with an indicator point that is extended to the shaft. The indicator point must be extended to a length that will allow the dial indicator to contact the shaft through the oil return hole. Make sure that the contact point is centered on the shaft. This will provide the highest indicator reading. Raise both ends of the shaft upward. Push both ends of the shaft downward in the opposite direction. The total movement of the indicator should be between 0.076 mm (0.003 inch) and 0.178 mm (0.007 inch). If radial clearance exceeds 0.187 mm (0.007 inch), or if the minimum clearance is under 0.076 mm (0.003 inch), the turbocharger should be disassembled and the bearings should be checked. Note: Do not cock the shaft. A false reading will be obtained if the shaft is cocked.Crankcase Pressure
Damaged pistons or piston rings that are broken or damaged can be the cause of too much pressure in the crankcase. This condition will cause the engine to run rough. A large amount of fumes may come from the crankcase breather due to this condition. This crankcase pressure can also cause the element for the crankcase breather to have a restriction in a very short time. If oil is leaking at the gaskets, or seals, there may be too much pressure in the crankcase.Compression
5P-7307 Engine Turning Tool An engine that runs rough may have a leak at the valves, or the engine may have valves that need adjustment. Run the engine at the speed that produces the rough running. Remove the wires from the transformers one at a time. This will help in detecting a cylinder that has low compression. This will stop the flow of current to that cylinder.Repeat this process for each cylinder. When a wire is removed and the engine performance is not affected, the cylinder with low compression has been detected. Be sure to install the wire for the transformer at the proper times. Install the wire after each cylinder test, and before removing another wire. This test can indicate a faulty transformer. A malfunctioning spark plug can be found with this test as well. Continue to test the cylinder.Condition of the valves, valve seats, pistons, piston rings and cylinder liners can be tested by checking the compression in each cylinder. Refer to the chart in the Operation and Maintenance Manual, "Every 750 Hours Cylinder Pressure Blowby" section.This test will detect the cause of loss of compression in a cylinder. Removal of the head is necessary to find small defects. Inspection of the valves and valve seats is necessary to find those small defects. Repair of these problems is normally done when the engine is reconditioned.Cylinder Head
The cylinder head has valve seat inserts, valve guides, and bridge dowels that can be removed. Replacement of these components can be made with the tools that follow.Valves
Use the 5S-1330 Valve Spring Compressor and the 5S-1322 Valve Keeper Installer in order to remove a valve. These tools can be used to install a valve.Valve Seat Inserts
The tools that are needed for removal and installation of the valve seat inserts are in the 166-7444 Valve Seat Extractor Tool Group. Refer to Special Instruction, SMHS7935. Lower the temperature of the valve seat insert before installing into the head of the engine. This will make the installation process easier.Valve Guides
The tools that are needed in order to install the valve guides are the 5P-2396 Bushing and the 9V-7349 Driver Assembly. The counterbore in the driver bushing installs the guide to the correct height. Valve Guide Bore
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Valve Guide GaugeUse the 5P-3536 Valve Guide Gauge Group in order to check the bore of the valve guides. Refer to Special Instruction, GMG02562 for complete instructions on the 5P-3536 Valve Guide Gauge Group .Bridge Dowel
Use a 5P-0944 Dowel