Fulltext results:
- REF: Engine Mechanicals
- 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
- 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
- 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
- REF: Engine Mechanicals
- 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
- 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
- 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
- REF: Engine Mechanicals - Sub-04G
- \ The first test was on a cold startup with used umbrella valves. Just testing the waters using black coffee as a ... in tap water was used as the liquid media. \\ The umbrella valves were in used state. The front umbrella had about 6 months use. \\ {{:techtalk:ref:engmech:hst_testing_refe... 3932&page=79)) \\ ===== Test after replacing the umbrellas ===== Upon removal of the old umbrellas, the rea
- REF: Engine Mechanicals - Sub-07N
- 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
- REF: Engine Mechanicals - Sub-05F
- 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
- 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
- REF: Engine Mechanicals - Sub-04J
- 1986-Up)]] \\ \\ ====== Comparing L1984 and 1991 Umbrella Valves ====== L1984-1990 umbrella valve (26856-82). \\ 1... ather_baffle_tube_by_gary_e.jpg?direct&300|}}| | Umbrella (check) Valves \\ L - (26856-82), R - (26856-89) ((photo by Gary
- REF: General-MSR 05
- om**. \\ Hissing sound. \\ **Condition**: \\ Bad umbrella valves. ((rejeanprimeau of the XLFORUM https://www.xlfo... l set your timing off and both intake and exhaust valves can hit the pistons and bend valves and pushrods. ((wedge of the XLFORUM https://www.xlforum.net/forum/sp... =stethoscope&page=8)) \\ Too tight will leave the valves open off their seat. \\ (which will be even more
- REF: Carburetor, Intake Manifold & Exhaust
- Breather Hoses (91 and UP) ====== ===== How the umbrella ( head breather) valves work ===== Read more about the breather system he... utlets in the heads. \\ The breathers are one-way umbrella valves. \\ These exit crankcase vapors through vents in... rate from the air by hitting the underside of the umbrella valve and dropping back down into the lower end. ... Air pressure is designed to continue up past the umbrella valve and exit the hole in each head on the intak
- REF: Engine Mechanicals - Sub-04M
- me#post281111)) \\ Often the original breathers / umbrella valves will no longer work or will become less effective... bolts for tightness and seal after you change the umbrella valves. * Rocker box gaskets are also susceptible to
- REF: Oiling & Lubrication
- xact power loss is variable but true. \\ With new umbrella valves installed, the RPM did not change with the oil ca... condition when air pressure blows by the rings or valves. * Blowby has some to do with oil puking out ... which may or may not have to do with the rings or valves. * The oil level only matters if the tank has... be completely. \\ **Yet still, the 10 PSI relief valves will open even in the later upgraded oil tanks**.
