Fulltext results:
- EVO: Engine Mechanicals @techtalk:evo
- crankcase_vent_3_by_norsexl.jpg?direct&300|}}| | Umbrella (check) Valves \\ L - (26856-82), R - (26856-89) ((photo by Gary... ds. * The new breather system uses (2) one-way umbrella valves (26856-89) placed in the rocker boxes (1 each pla... here is no dedicated section on the rocker box or umbrella valves (which seem to be regarded as mere gaskets). **I... e-rocker-cover?t=382922)) * **However, only one umbrella is used in each middle section**. \\ (only 2 umbrella valves are used in the entire engine.) ((Graywolf of the
- REF: Engine Mechanicals @techtalk:ref
- 16)) \\ The biggest problem occurs when the stock umbrella valves blow out or get hard and quit working as one way valves. \\ The purpose of one way valves is to allow the... if they are maintained properly. \\ Stock rubber umbrella valves will harden over time and need to be replaced. \\... er hose is always a trade off. * If the OEM umbrella valves are in good condition, there should be very littl... ne. \\ If anything can get back in, it means your umbrella valves are shot. \\ There will be quite a bit of oil com
- REF: Engine Mechanicals - Sub-04A @techtalk:ref
- ative pressure in the crankcase. Several breather valves use the "umbrella-type" valve heads ("umbrella"). For instance, in U.S. Pat. No. 5,067,449 to Bo... in the normally-closed position.// //Thus check valves of the umbrella-type are known and they are all of the normally-closed, one-way variety. Accordingly, while these valves permit flow out of the crankcase on over-pressure... mp.** \\ This is true. * **It also says the OEM umbrella is normally closed**. \\ But it isn't sealed all
- REF: Engine Mechanicals - Sub-04K @techtalk:ref
- he heads. \\ The new breather system uses one-way umbrella valves in the rocker boxes. \\ These exit crankcase vap... s functionally the same as 91-03 with the one-way umbrella valves in the rocker boxes. \\ These exit crankcase vapo... the air by hitting the underside of the screen / umbrella valve and dropping back down into the rocker box.... t again and take oil with it. * We have check valves in the rocker boxes (or cam chest respectively) t
- EVO: Oiling & Lubrication @techtalk:evo
- snorkels, there should be some resistance if the umbrella valves are closing properly. * Verify oil pressure a... ck the breather valves (umbrellas)**. * The umbrella valves are simple rubber flaps that will get hard over h... stall an external reed valve inline when your OEM umbrella fails. * 91-03 models have the umbrellas vi... ting crankcase pressure. | L82-90 cap, tube and umbrella ((photo by norseXL of the XLFORUM https://www.xlf
- REF: Engine Mechanicals @techtalk:ref
- ning air/oil mix is blown to two separate one way umbrella valves (one in each rocker box). \\ The cam cover no lon... le rocker box on the intake side. Each of the two umbrella valves are identical and smaller than the 86-90 umbrella... ning air/oil mix is blown to two separate one way umbrella valves (one in each rocker box). \\ The air/oil mix is f... embly with an umbrella inside. \\ Each of the two umbrella valves are identical as before but the breather assembly
- REF: Engine Mechanicals - Sub-05K @techtalk:ref
- for separating the oil mist from the air and the umbrella valves are the last collision point in the system. \\ Most of the oil falls off the bottom of the umbrella back into the lower rocker box section where it f... ngine. \\ The residual air pressure runs past the umbrella, out a hole in each middle rocker section to a ho... uppose to collect oil spits that make it past the umbrella and route it back into the engine. \\ The problem
- REF: Engine Mechanicals - Sub-05J @techtalk:ref
- e frame. * **79-90 engines** with the reed or umbrella valves can simply remove the OEM valve itself from the a... rect&300|}}| ====== List of Aftermarket Breather Valves ====== **Finding a better breather valve**: ((bu... by-article/page2?t=15705&page=2)) \\ The breather valves that work best on crankcase breathers have severa... ush-fit into your breather line. Metal diaphragm valves with e.g. springs are hopeless. \\ Also avoid oth
- EVO: Engine Mechanicals - Sub-04A @techtalk:evo
- ure there is no oil globs inside. \\ Replace the umbrella valves (91 and up). \\ Even the 04-up breather valve assemblies have an umbrella in each one. \\ These rubber parts will become br
- IH: Oiling & Lubrication @techtalk:ih
- l and stop working properly. * 79-up rubber umbrella valves can get hard and stop working properly. * D... nd loosen (unstick) the disc or reed. * L82 umbrella valves are simple rubber flaps that will get hard over h... stall an external reed valve inline when your OEM umbrella fails. * **Confirm how well the rings seal by... ting crankcase pressure. | L82-90 cap, tube and umbrella ((photo by norseXL of the XLFORUM https://www.xlf
- IH: Engine Mechanicals @techtalk:ih
- rpedia: \\ * [[techtalk:ref:engmech04k|Breather Valves (1957-Up)]] (list of breather valve changes) * ... )]] * [[techtalk:ref:engmech07s|XR-750 Breather Valves]] * [[techtalk:ref:engmech05|Breather Venting /... se volume is constantly changing. There are check valves in line with the breather outlets. \\ Their funct... is that beyond the first revolution, if the check valves are working properly, all you see out the breathe
- REF: Engine Mechanicals - Sub-07N @techtalk:ref
- iguration, the crankcase vents through a pair of "umbrella" valves, which are essentially check valves. \\ There is a slight air inlet into the motor fr... xpelled with the air being forced out through the umbrella valves. \\ But when the pistons go back up, the umbrella valves block the inflow of air, causing a slight vacuum in the ... the condition of the motor. Properly functioning umbrella valves therefore serve the purpose of significantly redu
- EVO: Engine Mechanicals - Sub-03M @techtalk:evo
- ker box that has a check valve incorporated (aka "umbrella" valve). * Rubber mount models use an air/oil s... except that small 1.580" intake & 1.350" exhaust valves are used. \\ And the valves are longer to work with the more shallow and smaller diameter chamber. \\ In... ake/1.480 exhaust) and special longer "conversion valves" are available to do this upgrade. \\ You can hav
- REF: Engine Mechanicals - Sub-05F @techtalk:ref
- were removed. \\ The rocker box mounted breather valves replace the OEM XL breather / umbrella valves. Vent lines off the breathers were tied together, into a catch can and to the rear of the bike. \\ |Both breather valves are connected to a ‘Y’ connector that runs along
- REF: Engine Mechanicals @techtalk:ref
- se volume is constantly changing. There are check valves in line with the breather outlets. \\ Their funct... is that beyond the first revolution, if the check valves are working properly, all you see out the breathe... a good motor, it's very little. But if the check valves are not working properly, the motor goes into an ... reather oil is caused by poorly functioning check valves. **Engine Breathing Cycle**: A mixture of crank
