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techtalk:evo:engmech02 [2020/03/02 04:42] hippysmack [Sub-Documents] |
techtalk:evo:engmech02 [2020/06/11 03:42] hippysmack |
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| ====== Tappets (lifters) ====== | ====== Tappets (lifters) ====== | ||
| - | + | \\ | |
| - | ==== 86-90 models ==== | + | |
| - | {{:techtalk:evo:engmech:86_engine_8_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) {{:techtalk:evo:engmech:86_engine_4_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) \\ | + | |
| ====== Hydraulic Lifters ====== | ====== Hydraulic Lifters ====== | ||
| ===== Sub-Documents ===== | ===== Sub-Documents ===== | ||
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| Hydraulic lifters self-adjust over about a .100" range, from .050" preloaded to .150" preloaded. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1720575)) \\ | Hydraulic lifters self-adjust over about a .100" range, from .050" preloaded to .150" preloaded. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1720575)) \\ | ||
| They'll actually work outside that range but they might make noise, so it's best to stay in that range. \\ | They'll actually work outside that range but they might make noise, so it's best to stay in that range. \\ | ||
| + | |||
| + | * **Measure at the rocker box how much the lifter will get preloaded at the rocker box**. ((http://www.hammerperf.com/ttpushrodlength.shtml)) | ||
| + | * Put your pushrods in place (remember, the longer one goes on the exhaust). | ||
| + | * Set the gasket and rocker box on top, and start the four big screws only. | ||
| + | * Finger tighten the left (spark plug) side. \\ (while making sure the right side is resting with the upper pushrod ends sitting in the cups on the rocker arms) | ||
| + | * Now take a simple caliper and measure how much gap you have between the rocker box and the rocker box gasket, as shown in the photo below. | ||
| + | * This won't be an exact answer, but it'll be pretty close. \\ Remember, you'd like to see the plunger preloaded about .100", but anywhere between .050" and .150" should work. \\ You can order pushrod lengths that are longer or shorter than your stock pushrods by the amount it takes to achieve .100" of lifter plunger preload. \\ If you don't have a caliper to measure your stock pushrod lengths, the information is available in most factory service manuals. | ||
| + | |||
| + | The lifter plunger should be preloaded between .050 and .150. Make the measurement if you're not sure. \\ | ||
| + | {{:techtalk:evo:engmech:checking_lifter_preload_by_aswracing.jpg?direct&300|}} ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=113818)) \\ | ||
| + | |||
| ===== Oil feed to lifters ===== | ===== Oil feed to lifters ===== | ||
| Line 138: | Line 147: | ||
| |91-99 engines have a single passage in that top \\ area, the tappets are connected by internal \\ passages from this small cavity.|On 2000 and up engines, oil travels to each lifter \\ individually from this cavity. ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1611832))| | |91-99 engines have a single passage in that top \\ area, the tappets are connected by internal \\ passages from this small cavity.|On 2000 and up engines, oil travels to each lifter \\ individually from this cavity. ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1611832))| | ||
| |{{:techtalk:evo:oil:cam_alignment_by_aswracing.jpg?direct&300|}}|{{:techtalk:evo:oil:lifter_oiling_by_aswracing.jpg?direct&300|}}| | |{{:techtalk:evo:oil:cam_alignment_by_aswracing.jpg?direct&300|}}|{{:techtalk:evo:oil:lifter_oiling_by_aswracing.jpg?direct&300|}}| | ||
| + | |||
| + | ====== 86-90 models ====== | ||
| + | |||
| + | Per HD Service Bulletin M-030A; \\ | ||
| + | Beginning with crankcase #1786 127 043 (883cc) and 1886 127 001 (1100cc), new style hydraulic lifters were installed at the factory. \\ | ||
| + | New style lifters can be identified by the presence of notches in the pushrod socket. \\ | ||
| + | [[techtalk:miscres:miscres05#tsb_900-949|Click here to go to the service bulletin page]] where you can download the service bulletin. \\ | ||
| + | |||
| + | - A piece of wire can no longer be used to dra1n lifter during installation. | ||
| + | - After push rod lengths have been measured and the correct length push rods selected, remove lower rocker boxes. | ||
| + | - Rotate engine so both lifters from the cylinder being serviced are on the base circle (lowest position of the cam). | ||
| + | - Install push rods and push rod tubes. Install new gaskets under lower rocker box. \\ Place lower rocker box assembly (with rocker arms and shafts) in position. \\ Place push rods in rocker arm sockets. | ||
| + | - Slowly snug all rocker box fasteners in small increments (one turn at a time). \\ Use a cross pattern on the four large bolts that fasten the lower rocker box to head. \\ This will bleed the lifters. Tighten fasteners to the correct torque. Refer to the 1986 XLH Service Manual for the proper tightening sequence. \\ **CAUTION**, Do not turn the engine over until both push rods can be turned with fingers to avoid damage to push rods or rocker arms. | ||
| + | - Repeat Steps 2 through 5 for other cylinder | ||
| + | |||
| + | |||
| + | {{:techtalk:evo:engmech:86_engine_8_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) {{:techtalk:evo:engmech:86_engine_4_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) \\ | ||
| + | |||
| ====== 91-99 Lifters ====== | ====== 91-99 Lifters ====== | ||
