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techtalk:ih:oil01 [2019/06/16 02:43] hippysmack [Wet Sumping] |
techtalk:ih:oil01 [2019/06/21 04:40] hippysmack |
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| The filter mount is mounted on the lower left front engine mount. \\ | The filter mount is mounted on the lower left front engine mount. \\ | ||
| This has also been a popular practice on earlier bikes. \\ | This has also been a popular practice on earlier bikes. \\ | ||
| - | | Filter installed on an 80 XLH motor mount. ((photo by hscic of the XLFORUM http://xlforum.net/forums/showthread.php?t=2053271&highlight=motor+mount+oil+filter&page=45)) | | + | |82-E84 motor / filter mount. ((photo by sifty of the XLFORUM http://xlforum.net/forums/showthread.php?t=1592463&page=22))| Filter installed on an 80 XLH motor mount. ((photo by hscic of the XLFORUM http://xlforum.net/forums/showthread.php?t=2053271&highlight=motor+mount+oil+filter&page=45)) | |
| - | |{{:techtalk:ih:oil:80_xlh_left_side_by_hscic.jpg?direct&300|}}| | + | |{{:techtalk:ih:oil:82-e84_front_left_motor_mount_by_sifty.jpg?direct&300|}}|{{:techtalk:ih:oil:80_xlh_left_side_by_hscic.jpg?direct&300|}}| |
| **----- L1984-1985 Models -----** | **----- L1984-1985 Models -----** | ||
| Line 355: | Line 355: | ||
| It opens solely from the pressure generated from the oil pump with the assistance of the check valve to hold some of that pressure in the pump. \\ | It opens solely from the pressure generated from the oil pump with the assistance of the check valve to hold some of that pressure in the pump. \\ | ||
| So, it is possible but not likely to have a stuck closed check valve with no oil light on. \\ | So, it is possible but not likely to have a stuck closed check valve with no oil light on. \\ | ||
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| - | |||
| - | ====== Crankcase Ventilation ====== | ||
| - | ====== (or Foo Foo Valve) ====== | ||
| - | |||
| - | ===== Ironhead Engine breather 101 Through 1985 ===== | ||
| - | WHAT IS IT? | ||
| - | * The slang term "FooFoo" comes from the annoying sound that it makes when it gets clogged up with oil residue. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1332902&page=3)) | ||
| - | * The engine breather, or crankcase vent as Harley sometimes calls it, is to allow air out of the lower crankcase, but not in, as the pistons rise and fall. Without some kind of controlled breather, the lower end would become a 1,000cc air compressor, robbing the engine of several horsepower. Old time tuners like Jerry Branch, Tom Sifton and Dick O’Brien paid much attention to the engine breather because they knew it could give them extra horsepower if set up right. | ||
| - | * One thing not to do with an engine breather is to simply plumb a hose to the crankcase without some kind of one-way valve or timed breather valve. It is commonly done, but it wastes power and is not good for your engine. | ||
| - | |||
| - | WHERE IS IT? | ||
| - | * **Pre-1977** | ||
| - | * There is a timed breather valve built into the oil pump drive, which vents crankcase pressure into the cam timing chest. A six-inch metal tube hanging down from the timing cover near the generator drive, at the 6 o’clock position vents that controlled pressure to atmosphere. A metal disc on the end of the generator drive gear centrifugally separates oil from the air as it is discharged overboard. | ||
| - | * **1977-78 only** ((Hopper)) ((HD Service Bulletin #M-708 dated December 1, 1976)) | ||
| - | * The timed breather on the oil pump drive was dropped. A new design breather valve (24633-77) was used in late 1977 model XL/XLCH/XLT engines produced around October 15, 1976. All 1000cc engine numbers (3A, 4A or 2G) 27940H7 and above had the new breather valve. It serves the same function as the gear driven breather valve used on 1976 and earlier engines to maintain a partial vacuum in the engine and prevent oil leakage. Due to it's improvements in doing so, it was suggested to be retrofitted to all 1977 XL & XLCH engines. | ||
| - | * The one-way valve is contained in a fitting which screws into the gear-case cover below the generator mounting boss. The existing breather outlet pipe screws into the bottom of the new fitting. The outlet pipe because of its lower position must be directed outside (instead of inside) the frame tube. The rubber hose at the pipe outlet must no longer be used. | ||
| - | * Because of the higher vacuum existing in the engines equipped with this new breather valve, a higher pressure oil pump check valve (26435-76A) was installed in L1977 oil pumps at the same time to provide higher oil pressure at the oil pressure light switch. | ||
| - | * The new valve opens at 4-6 PSI whereas the old valve opens at 2-4 PSI. Pumps having the new valve are identified with a green dot. The existing 0-ring (26433- 77) was used for both new and old valves. | ||
| - | * An external non-return valve was plumbed into the vent tube sticking down from the timing cover at the generator drive. This allows air out, but not in. It is sometimes referred to as the foo-foo valve. Searching the XLFORUM for __foo foo valve__ or __foo-foo__ will lead to extensive discussions of this mystical device. | ||
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| - | |{{:techtalk:ih:oil:77-78_ext_foo_foo_valve_1_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:oil:77-78_ext_foo_foo_valve_2_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:oil:77-78_ext_foo_foo_valve_3_by_hopper.jpg?direct&300|}}| | ||
| - | | 77-78 Crankcase Ventilation Valve ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?p=1960632)) | | ||
| - | |||
| - | * **1979-E1982**. | ||
| - | * The external foo-foo valve and the six-inch metal vent tube at the front of the timing cover were done away with. Instead, a one-way foo-foo valve was built inside the timing cover. A rubber breather hose then ran from the generator drive area of the timing cover, at the 9 o’clock position. It connected to the stock air filter so that any oil mist was fed back through the engine, making the EPA pollutocrats more happier than they were with the idea of engine oil spraying out into the atmosphere. The generator had a (1-5/8" O.D.) oil separator washer on the end of the armature shaft. ((HD Service Bulletin #M-848 dated April 9, 1982)) | ||
| - | |||
| - | * **L1982-1985** | ||
| - | * The internal crankcase breather valve was redesigned to incorporate a rubber umbrella valve attached to the base plate along with a larger diameter (1-3/4" O.D.) oil separator washer on the generator armature. ((HD Service Bulletin #M-848 dated April 9, 1982)) | ||
| - | |||
| - | Many of these bikes with custom air filters simply run that hose down to the bottom of the frame and let the oil mist blow out in the time honored manner. \\ | ||
| - | That is fine too, as long as you are not an EPA man. \\ | ||
| - | |||
| - | Just to add to the knowledge base, here is a pic of IronMick's internal foo-foo in his post-79 model on the left. \\ | ||
| - | You can see the 9 oclock fitting and the 6 oclock fitting both enter the same cavity. \\ | ||
| - | The pic on the right is of an 85 cam cover with the foofoo valve (baffle tube) off to the left of it. \\ | ||
| - | |||
| - | {{techtalk:ih:oil:ihcamcoverxlf.jpg?direct&250|}} ((photo by ryder rick of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&page=2)) {{:techtalk:ih:oil:85_cam_cover_1_by_billeuze.jpg?direct&300|}} ((photo by billeuze of the XLFORUM http://xlforum.net/forums/showthread.php?t=1103082)) | ||
| - | |||
| - | ALTERNATIVES | ||
| - | * There is a product called a Krankvent that can be plumbed into the lower, 6 o’clock position as an alternative to a stock foo-foo valve. But they are not cheap. | ||
| - | * Automotive PCV valves are not really made to handle the revs or air volumes of a Harley. While a car engine is bigger, it has one piston coming down while one goes up, so not much change in internal crankcase volume, so not much breathing to be done. A Harley has two pistons and rods on one crankpin, so is one giant air compressor. | ||
| - | * Some guys have found that plumbing in a 77-78 foo-foo valve on the later model engines improves breathing. | ||
| - | LINKS- Discussion on foo-foo valves and engine breathers pics etc here: | ||
| - | [[http://xlforum.net/forums/showthread.php?t=213630]] | ||
| - | |||
| - | There are other threads but this pretty much covers it all anyhow. Pretty simple but seems to cause repeated headaches for such a pesky little thing. ((Hopper from the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=wet+sumping)) | ||
| - | |||
| ====== Top End Oiling ====== | ====== Top End Oiling ====== | ||
| Line 416: | Line 368: | ||
| Remove both oil lines, and check the rubbers on both ends of each. \\ | Remove both oil lines, and check the rubbers on both ends of each. \\ | ||
| + | | Oil line sleeves. ((photos by sc72 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1704463)) || | ||
| + | |{{:techtalk:ih:oil:83_model_oil_line_sleeves_1_by_sc72.jpg?direct&250|}}|{{:techtalk:ih:oil:83_model_oil_line_sleeves_1_by_sc72.jpg?direct&250|}}| | ||
| ===== Rocker Box ===== | ===== Rocker Box ===== | ||
| The feed to the rockers is not a large diameter passage and not a lot of oil goes to the rocker gear. ((Ferrous Head of the XLFORUM http://xlforum.net/forums/showthread.php?t=753175&highlight=split+rocker+box)) \\ | The feed to the rockers is not a large diameter passage and not a lot of oil goes to the rocker gear. ((Ferrous Head of the XLFORUM http://xlforum.net/forums/showthread.php?t=753175&highlight=split+rocker+box)) \\ | ||
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| - | ====== Transfer Valve ====== | + | ====== Transfer Valve (76 and earlier) ====== |
| The foregoing by Dr Dick ((http://xlforum.net/forums/showpost.php?p=3886388&postcount=40)) | The foregoing by Dr Dick ((http://xlforum.net/forums/showpost.php?p=3886388&postcount=40)) | ||
