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techtalk:ref:svcproc21 [2019/01/09 03:42] ixl2relax [REF: Troubleshooting - Engine - 04] |
techtalk:ref:svcproc21 [2021/07/31 22:38] hippysmack [Interpreting the Readings] |
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| * See [[techtalk:ref:svcproc20|Performing a Compression Test]] in the REF section of the Sportsterpedia. | * See [[techtalk:ref:svcproc20|Performing a Compression Test]] in the REF section of the Sportsterpedia. | ||
| * Generally if a compression test shows anything suspect, the next step is a leak down test. ((milmat1 of the XLFORUM http://xlforum.net/forums/showthread.php?t=26208&page=2)) | * Generally if a compression test shows anything suspect, the next step is a leak down test. ((milmat1 of the XLFORUM http://xlforum.net/forums/showthread.php?t=26208&page=2)) | ||
| - | * A leak-down test checks the cylinder's ability to hold pressure (seal) and will reflect where the leak is occuring. | + | * A leak-down test checks the cylinder's ability to hold pressure (seal) and will reflect where the leak is occuring. \\ A leak down test is the best way to check the mechanical integrity of the motor without tearing it down. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=15705)) |
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| - | * The actual numbers are not as important as the relationship of each cylinder. As long as both juggs are close to each other, don't sweat the actual readings. There are lots of variables that can affect those readings. ((scottfisher of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311&page=3)) | + | * The actual numbers are not as important as the relationship of each cylinder. As long as both jugs are close to each other, don't sweat the actual readings. There are lots of variables that can affect those readings. ((scottfisher of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311&page=3)) |
| * Make a note of the reading and the date you took it, check it again after a few rides and see if it reads the same using the same equipment. ((scottfisher of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311&page=3)) | * Make a note of the reading and the date you took it, check it again after a few rides and see if it reads the same using the same equipment. ((scottfisher of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311&page=3)) | ||
| Line 174: | Line 174: | ||
| * Check pushrod length (86 and up engines). ((86 HD XL FSM pg 3-11)) | * Check pushrod length (86 and up engines). ((86 HD XL FSM pg 3-11)) | ||
| - | |{{:techtalk:ref:trouble:sticking_valve_3_by_73hardtail.jpg?direct&300|}}|{{:techtalk:ref:trouble:sticking_valve_4_by_73hardtail.jpg?direct&300|}}|{{:techtalk:ref:trouble:sticking_valve_5_by_73hardtail.jpg?direct&300|}}| | + | |{{techtalk:ref:svcproc:sticking_valve_3_by_73hardtail.jpg?direct&300|}}|{{techtalk:ref:svcproc:sticking_valve_4_by_73hardtail.jpg?direct&300|}}|{{techtalk:ref:svcproc:sticking_valve_5_by_73hardtail.jpg?direct&300|}}| |
| | Excess carbon between valve and seat causing a leak on this 73 XLCH. ((photo by '73hardtail of the XLFORUM)) ||| | | Excess carbon between valve and seat causing a leak on this 73 XLCH. ((photo by '73hardtail of the XLFORUM)) ||| | ||
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| * Running and re-testing the cylinder may rotate the gaps out of alignment and yield higher psi readings. | * Running and re-testing the cylinder may rotate the gaps out of alignment and yield higher psi readings. | ||
| - | |{{:techtalk:ref:trouble:piston_rings_by_04xl1200c.jpg?direct&300|}}| | + | |{{techtalk:ref:svcproc:piston_rings_by_04xl1200c.jpg?direct&300|}}| |
| |Top 2 rings are lined up vertically on this piston ((photo by 04xl1200c of the XLFORUM http://xlforum.net/forums/showthread.php?t=1836174, edited by Hippysmack))| | |Top 2 rings are lined up vertically on this piston ((photo by 04xl1200c of the XLFORUM http://xlforum.net/forums/showthread.php?t=1836174, edited by Hippysmack))| | ||
| * **Ringland Failure**: | * **Ringland Failure**: | ||
| - | |{{:techtalk:ref:trouble:ringland_failure_by_aswracing.jpg?direct&300|}}| | + | |{{techtalk:ref:svcproc:ringland_failure_by_aswracing.jpg?direct&300|}}| |
| |This piston is just about to break from too much \\ cylinder pressure. This is from a race motor using \\ Nitromethane ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=616889))| | |This piston is just about to break from too much \\ cylinder pressure. This is from a race motor using \\ Nitromethane ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=616889))| | ||
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| * **A hole in a piston would probably tell on itself** as in the pics below. \\ A dual psi gauge was set up at 92 psi, then the outlet was opened up, full hose, with the readings recorded in the second pic. \\ This left an inlet side 60 psi and outlet side of 48 psi while flowing from a small peanut air tank. It was more of a high pressure sound than a hiss. | * **A hole in a piston would probably tell on itself** as in the pics below. \\ A dual psi gauge was set up at 92 psi, then the outlet was opened up, full hose, with the readings recorded in the second pic. \\ This left an inlet side 60 psi and outlet side of 48 psi while flowing from a small peanut air tank. It was more of a high pressure sound than a hiss. | ||
| - | |{{:techtalk:ref:tools:hf_leakdown_tester_9_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:hf_leakdown_tester_10_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:trouble:holed_piston_by_ironmick.jpg?direct&300|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=896763))| | + | |{{:techtalk:ref:tools:hf_leakdown_tester_9_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:hf_leakdown_tester_10_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:svcproc:holed_piston_by_ironmick.jpg?direct&300|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=896763))| |
