TURBOCHARGER - TM-5-3805-263-14P-2

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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AIR INLET AND EXHAUST SYSTEM TM 5-3805-263-14&P-2 TURBOCHARGER Every 7200 hours or if any unusual sound or vibra- tion in the turbocharger is noticed, a quick check of bearing condition can be made without disassem- bling the turbocharger. Remove the piping from the turbocharger and inspect the compressor impeller, turbine wheel and compressor cover. Rotate the compressor and turbine wheel assembly by hand and check for too much end play and radial clearance. The rotating assembly must rotate freely with no rubbing or binding. If there is any indication of the impeller rubbing the compressor cover or the turbine wheel rubbing the turbine housing, recondition the turbocharger or replace with a new or rebuilt one. End clearance is best checked with a dial indica- tor. Install a dial indicator with the indicator point on the end of the shaft. Move the shaft from end to end making note of the total indicator reading. End play for the Turbocharger is .001 to .004 in. (0.03 to 0.10 mm). If end play is more than the maximum end play rebuild or replace the turbocharger. End play less than the minimum end play can indicate carbon build up on the turbine wheel. Disassemble for clean- ing and inspection. A more reliable check of bearing condition can be made only when the turbocharger is disassembled and the bearings, shaft journal and housing bore diameters can actually be measured. TESTING AND ADJUSTING Radial clearance can also be checked with a dial indicator. Remove the oil return line from the turbo- charger. Install a dial indicator with an extension in- dicator point long enough to contact the shaft through the oil return hole. Make sure the contact point is centered on the shaft (highest indicator reading). Raise both ends of the shaft all the way then push down in the opposite direction. If radial clearance is more than .006 in. (0.15mm) or mini- mum clearance is less than .003 in. (0.08mm), the turbocharger must be disassembled and the bear- ings checked. NOTE: Care must be taken not to cock the shaft or a false reading will be obtained. CRANKCASE (CRANKSHAFT COMPARTMENT) PRESSURE Pistons or piston rings that have damage can be the cause of too much pressure in the crankcase. This condition will cause the engine to run rough. There will also be more than the normal amount of fumes coming from the crankcase breather. This crankcase pressure can also cause the element for the crankcase breather to have a restriction in a very short time. It can also be the cause of oil leakage at gaskets and seals that would not normally have leakage. Normal crankcase pressure with a clean crankcase breather is 2 in. (50.8 mm) of H₂O or less. MEASUREMENT OF EXHAUST TEMPERATURES Use the 1P3060 Pyrometer Group to check ex- haust temperature. 1-58

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