EVO: Oiling & Lubrication - Sub-01F

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====== EVO: Oiling & Lubrication - Sub-01A ======
====== Drain Oil Passages Through Pics ======
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===== 86-90 Engines =====
{{:techtalk:evo:oil:86-90_sportster_oil_drainage_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack))
==== Gravity Drains ====
  * __**Gravity oil**__ (drained from rocker boxes and head/cylinder drainage) falls on moving parts and into the crankcase.
    * Oil collected in the rocker box is returned to the crankcase through a passage in the cylinder and the head.
    * Oil collected in the push rod areas of the heads / rockers flows down the pushrod covers.
      * Then it flows down into the gearcase / cam chest through drain holes through in the tappet blocks.
      * Collected oil in the gearcase is routed to the crankshaft sump area via a low hole in the wall between them on the right side of the pinion shaft.
    * Excess oil mist drawn into the gearcase breather is separated from crankcase air pressure at the gearcase breather valve.
      * The separated oil (and condensed oil in the exit hose) flows into a drain hole below the breather valve and back into the gearcase.

Tappet blocks are directional (rear exhaust shown below). \\
{{:techtalk:evo:oil:tappet_block_1986-1990_sportster_pic1_by_robison_motorcycles.jpg?direct&300|}} ((photo courtesy of Ebay seller, Robison Motorcycles [[https://www.ebay.com/str/robisonmotorcycles?_trksid=p2047675.l2563|Link to Ebay Store]] )) {{:techtalk:evo:oil:tappet_block_1986-1990_sportster_pic2_by_robison_motorcycles.jpg?direct&300|}} ((photo courtesy of Ebay seller, Robison Motorcycles [[https://www.ebay.com/str/robisonmotorcycles?_trksid=p2047675.l2563|Link to Ebay Store]] )) \\

==== Splash ====
  * __**Occasional excess pressured oil (from the oil filter pad)**__ is dumped into the gearcase by the oil pressure relief valve.
    * High pressure oil, when cold (on startup), opens the pressure regulator.
    * The excess oil is dumped into the gearcase and routed to the sump area via the low hole in the wall between the gearcase and the crankcase.
  * __**Splash oil**__ in the sump area of the crankcase serves to lubricate the moving parts as well.


    * Splash oil (from the up and down movement of the connecting rods, crankshaft and pressure generated under the pistons on downstroke) serves to lubricate;
    * Cylinder walls
    * Pistons, piston pins
    * Cam gears and bushings
    * Main bearings


|  86-90 engine sump splash holes ((photo by Mini_blitz of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/183493-1986-evolution-sportster-cam-cover-install-help/page3?t=1974615&page=3))  |
|{{:techtalk:evo:oil:86-90_sump_splash_ports_oiling_by_mini_blitz.jpg?direct&300|}}|

==== Oil Pump Scavenge ====
  * __**Drainage**__

|  86-90 oil scavenging ((photo by Mini_blitz of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/183493-1986-evolution-sportster-cam-cover-install-help/page3?t=1974615&page=3))  |  86-90 cam cover ((photo by engine of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-styles/sportster-motorcycle-project/13592-1200-conv-progress?t=22717))  |  86-90 Oil Pump Oiling Paths. ((photo by Hippysmack))  |
|{{:techtalk:evo:oil:86-90_engine_scavenging_by_mini_blitz.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_cam_cover_by_engine.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_oiling_paths_by_hippysmack.jpg?direct&300|}}|

===== 91-Up Engines =====
{{:techtalk:evo:oil:91_sportster_oil_drainage_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:oil:92-97_sportster_oil_drainage_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack))  \\

{{:techtalk:evo:oil:98-03_sportster_oil_drainage_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:oil:04_and_up_sportster_oil_drainage_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack))  \\

==== Gravity ====
  * __**Gravity oil**__ (drained from rocker boxes and head/cylinder drainage) falls on moving parts and into the crankcase.
    * __**(91 only) - Occasional excess pressured oil (from the oil filter pad)**__ is dumped into the gearcase by the oil pressure relief valve.
      * 91 engines kept the oil pressure relief valve that opens at 30-35 psi and dumps oil into the gearcase.
      * The pressure relief was removed from future models.    
    * __**91-03**__
      * Oil collected in the rocker box is returned to the crankcase through a passage in each head and cylinder.
      * Oil collected in the push rod areas of the heads / rockers flows down the pushrod covers.
        * Then it flows down into the gearcase / cam chest through vertical drain holes in the tappet blocks.
      * Excess oil mist splashed into the rocker boxes is separated from crankcase air pressure at the breather baffles (plain umbrella valves).
        * The separated oil flows into drain holes in the rocker boxes and back into the crankcase.

|  Rocker box drainage ((photo by Hippysmack))  |
|{{:techtalk:evo:oil:98_xl_rocker_and_head_by_hippysmack.jpg?direct&300|}}|

|  91-03 breather holes in the rocker box sections and head ((photos by Hippysmack))  |||
|{{:techtalk:evo:oil:head_breather_holes_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:head_breather_holes_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:head_breather_holes_3_by_hippysmack.jpg?direct&300|}}|

|  91-03 style front head drainage hole  ((photos by Hippysmack))  ||  Head drains in the cylinders ((photo by Hippysmack))  |
|{{:techtalk:evo:oil:head_drain_holes_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:head_drain_holes_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:98_cylinder_head_drains_by_hippysmack.jpg?direct&300|}}|

|  91-03 style rear head drainage hole  ((photos by Hippysmack))  ||  Head drains at the cylinder base on the case. ((photo by isiahstites of the XLFORUM https://www.xlforum.net/forum/sportster-buell-motorcycle-racing/lsr-sporster-buell-motorcycle-land-speed-record/31067-my-ls-build/page5?t=51598&page=5))  |
|{{:techtalk:evo:oil:head_drain_holes_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:head_drain_holes_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:91-99_case_drains_by_isiahstites.jpg?direct&300|}}|

    * __**04-Up**__
      * Oil collected in the rocker box is returned to the gearcase through a passage in the head and the right case.
      * Oil collected in the push rod areas of the heads / rockers flows down the pushrod covers.
        * Then it flows down into the gearcase / cam chest through vertical drain holes in the tappet blocks.
      * Excess oil mist splashed into the rocker boxes is separated from crankcase air pressure at the breather baffles (fancy umbrella valves).
        * The separated oil flows into drain holes in the rocker boxes and back into the gearcase.

|  Head drains in the cylinders ((photo by JohnK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/132786-fixing-a-leaky-top-end-with-pics/page6?t=1422877&page=6)) \\ 1 hole is plugged on each cylinder during installation.  |  Head drains at the cylinder base on the case ((photo by JohnK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/132786-fixing-a-leaky-top-end-with-pics/page4?t=1422877&page=4))  |
|{{:techtalk:evo:oil:05_cylinder_drain_holes_2_by_johnk.jpg?direct&300|}}|{{:techtalk:evo:oil:05_head_drains_by_johnk.jpg?direct&300|}}|

|Milled slots in the left case match milled slots in the \\ right case for rocker box drain from valve side. ((photo by bsaman of the XLFORUM, labeled by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/rubber-mount-sportster-motorcycle-talk-2004-2006/87615-crank-replacement-documentation/page3?t=691283&page=3))|Lower part of slots in the right case exit thru drilled holes into the gearcase. ((photo by meherdad_it of the XLFORUM, labeled by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/105751-installing-the-90-nrhs?threadid=944843))||
|{{:techtalk:evo:oil:04-up_topend_oil_drainage_by_bsaman.jpg?direct&300|}}|{{:techtalk:evo:oil:06_right_crankcase_1_by_meherdad_it.jpg?direct&300|}}|{{:techtalk:evo:oil:06_cam_chest_head_drains_by_meherdad_it_-cropped-labeled_by_hippysmack.jpg?direct&300|}}|

|  Rocker box drains into the cam chest. ((photos by dieselvette of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/197307-sportster-crankcase-pressure-engine-breathing-wetsumping-and-mods/page67?t=2073932&page=67))  ||
|{{:techtalk:evo:oil:04_rocker_box_drains_into_cam_chest_wall_1_by_dieselvette.jpg?direct&300|}}|{{:techtalk:evo:oil:04_rocker_box_drains_into_cam_chest_wall_2_by_dieselvette.jpg?direct&300|}}|



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