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techtalk:evo:engmech03 [2019/07/12 03:49] ixl2relax [Cylinder Pressure Test] |
techtalk:evo:engmech03 [2019/12/09 17:11] hippysmack [Heads] |
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| [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | ||
| ====== EVO: Engine Mechanicals ====== | ====== EVO: Engine Mechanicals ====== | ||
| + | \\ | ||
| + | ====== Cylinders, Heads, Pistons & Rods ====== | ||
| + | |||
| + | ===== Sub Documents ===== | ||
| + | * [[techtalk:evo:engmech03a|Cylinder / Head Bolt Issues and Repair]] | ||
| + | * [[techtalk:evo:engmech03b|Time-Sert Repair on Engine Case Cylinder / Head Stud Hole]] | ||
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| **Results** The difference between the two readings should not be more than 10%. A low reading on either cylinder indicates a possible valve or piston ring issue. To determine which, pour about 1/2 teaspoon of oil into that cylinder through the spark plug hole. Then repeat the compression test. If the reading returns to normal the rings may be defective. If the compression does not increase to within 10% then the valves of that cylinder may require service. | **Results** The difference between the two readings should not be more than 10%. A low reading on either cylinder indicates a possible valve or piston ring issue. To determine which, pour about 1/2 teaspoon of oil into that cylinder through the spark plug hole. Then repeat the compression test. If the reading returns to normal the rings may be defective. If the compression does not increase to within 10% then the valves of that cylinder may require service. | ||
| - | Compression test results vary on stock models but, typically expect a minimum of 120PSI. | + | Compression test results vary on stock models but, typical rule-of-thumb is a minimum of 120PSI for 883 engines & 150PSI for 1200 engines. |
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| |0.030 OS Bore|3.0328 in|3.3828 in|3.530 in| | |0.030 OS Bore|3.0328 in|3.3828 in|3.530 in| | ||
| |0.040 OS Bore|3.0428 in|3.3928 in|----| | |0.040 OS Bore|3.0428 in|3.3928 in|----| | ||
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| + | Take note:\\ | ||
| + | Since the 2009 model year, the 883 cylinder construction changed dramatically and you can no longer bore them to 1200 at all.((aswracing comment at http://xlforum.net/forums/showthread.php?t=1569673)) | ||
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| ====== Heads ====== | ====== Heads ====== | ||
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| + | Torque Sequence: \\ | ||
| + | {{:techtalk:evo:engmech:head_torque_sequence_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack http://xlforum.net/forums/showthread.php?p=5793537#post5793537)) \\ | ||
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| If you put an 88-03 style piston into an 04+ bike, the skirt on the side will smack into the oil squirter and break it off. \\ | If you put an 88-03 style piston into an 04+ bike, the skirt on the side will smack into the oil squirter and break it off. \\ | ||
| It's a full tear down to fix. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1842712&highlight=rocker+box&page=3)) \\ | It's a full tear down to fix. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1842712&highlight=rocker+box&page=3)) \\ | ||
