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techtalk:ref:svcproc20 [2019/01/09 03:30] ixl2relax ↷ Links adapted because of a move operation |
techtalk:ref:svcproc20 [2019/10/16 22:16] ixl2relax [Test Each Cylinder for Compression] |
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[[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | ||
- | ====== REF: Troubleshooting - Engine - 03 ====== | + | ====== REF: Service Procedures 20 ====== |
====== Cylinder Compression Test ====== | ====== Cylinder Compression Test ====== | ||
A compression test should be done as part of each tune-up. Record the results and follow any changes over time. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) \\ | A compression test should be done as part of each tune-up. Record the results and follow any changes over time. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) \\ | ||
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- Ride the bike to get the engine up to operating temperature. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | - Ride the bike to get the engine up to operating temperature. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | ||
- Disconnect the power to the coil to prevent it from firing. | - Disconnect the power to the coil to prevent it from firing. | ||
- | * The extra two plugs (on dual plug heads) & wires can remain in place during this test. ((IXL2Relax of the XLFORUM http://xlforum.net/forums/showthread.php?t=2005378)) | + | * The extra two plugs (on dual plug heads) need to remain in place during this test. ((IXL2Relax of the XLFORUM http://xlforum.net/forums/showthread.php?t=2005378)) |
* If you can't disconnect power to the coil, ground out all the plug wires. | * If you can't disconnect power to the coil, ground out all the plug wires. | ||
- | - Clean the area around the spark plugs and remove them. ((79-85 HD XL/XR FSM pg 3-10)) | + | - Clean the area around the spark plugs __BEFORE__ you remove them. ((79-85 HD XL/XR FSM pg 3-10)) |
* If you haven't disconnected the coil, you can insert the plugs into the plug wires and press the plugs against the cylinder heads for grounding. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | * If you haven't disconnected the coil, you can insert the plugs into the plug wires and press the plugs against the cylinder heads for grounding. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | ||
- Connect the compression gauge to the first cylinder. | - Connect the compression gauge to the first cylinder. | ||
- | - Make sure the choke and throttle plate is closed before turning over the engine. | + | - Make sure the **throttle plate is fully open** (and choke, if present) before turning over the engine (not the enrichener). |
- | * If using a CV carb, hold the slide up. ((aswracing http://xlforum.net/forums/showthread.php?t=26208&page=2)) | + | * If using a CV carb, **hold the slide up.** ((aswracing http://xlforum.net/forums/showthread.php?t=26208&page=2)) |
- | * If the cylinder can't freely pull in air, the compression reading will be low. | + | * If the cylinder can't freely pull in air, the compression reading will be low. |
+ | * **Do NOT pull the enrichener knob** - The enrichener is mis-named a choke but it is not a choke plate. | ||
- Crank the engine continuously through 5-7 compression strokes. (until there is no further increase in reading at the gauge) ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | - Crank the engine continuously through 5-7 compression strokes. (until there is no further increase in reading at the gauge) ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | ||
- Record the readings at the end of the first and last strokes for this cylinder. | - Record the readings at the end of the first and last strokes for this cylinder. | ||
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- Repeat for the second cylinder. | - Repeat for the second cylinder. | ||
- | {{:techtalk:ref:tools:checking_compression_1_by_mathormell.jpg?direct&300|}} ((photo by MatHormell of the XLFORUM http://xlforum.net/forums/showthread.php?t=1976997&page=71)) {{:techtalk:ref:tools:checking_compression_2_by_mathormell.jpg?direct&300|}} ((photo by MatHormell of the XLFORUM http://xlforum.net/forums/showthread.php?t=1976997&page=71)) | + | {{techtalk:ref:svcproc:checking_compression_1_by_mathormell.jpg?direct&300|}} ((photo by MatHormell of the XLFORUM http://xlforum.net/forums/showthread.php?t=1976997&page=71)) {{techtalk:ref:svcproc:checking_compression_2_by_mathormell.jpg?direct&300|}} ((photo by MatHormell of the XLFORUM http://xlforum.net/forums/showthread.php?t=1976997&page=71)) |
====== Interpreting the Readings ====== | ====== Interpreting the Readings ====== | ||
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===== Tracking Your Test Results ===== | ===== Tracking Your Test Results ===== | ||
- | {{:techtalk:ref:trouble:sportsterpedia_compression_test_chart.jpg?direct&600|}} | + | {{techtalk:ref:svcproc:sportsterpedia_compression_test_chart.jpg?direct&600|}} |
\\ | \\ | ||
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**Full Article**: http://xlforum.net/forums/showthread.php?t=1567509 \\ | **Full Article**: http://xlforum.net/forums/showthread.php?t=1567509 \\ | ||
**Pics of the Damage**: ((Photos by sep69 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567509&page=2)) | **Pics of the Damage**: ((Photos by sep69 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567509&page=2)) | ||
- | |{{:techtalk:ref:trouble:piston_damage_1_by_sep69.jpg?direct&300|}}|{{:techtalk:ref:trouble:piston_damage_2_by_sep69.jpg?direct&300|}}|{{:techtalk:ref:trouble:piston_damage_3_by_sep69.jpg?direct&300|}}| \\ | + | |{{techtalk:ref:svcproc:piston_damage_1_by_sep69.jpg?direct&300|}}|{{techtalk:ref:svcproc:piston_damage_2_by_sep69.jpg?direct&300|}}|{{techtalk:ref:svcproc:piston_damage_3_by_sep69.jpg?direct&300|}}| \\ |