rev tec
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Stellar HDF Member
Joined: May 2018
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From: australia
i started it up today and followed the trail of oil it is running down the air filter backing plate on to the cam cover then to the ground but only marginal compared to yesterdays puddle. sounds to me its normal after the trike sitting for so long. agreed ?
Stellar HDF Member
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From: College Station, TX
Not very familiar with RevTec engines, but I believe they use the same top breather set up as HD EVO engines with umbrella valves in the rocker boxes. If the oil is coming from the air cleaner and the breather still vents to the air cleaner then I'd look at how it is vented. And how much oil is inside the air cleaner? Either way, that is way too much oil coming out to be normal.
Paul
Paul
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From: Cental, MI
Not very familiar with RevTec engines, but I believe they use the same top breather set up as HD EVO engines with umbrella valves in the rocker boxes. If the oil is coming from the air cleaner and the breather still vents to the air cleaner then I'd look at how it is vented. And how much oil is inside the air cleaner? Either way, that is way too much oil coming out to be normal.
Paul
Paul
On Bottom Breathers I do Not route to Air cleaner... Invariably ruins/contaminates the Air Cleaner!! With Head Breathers, I have Never had a Problem, routed to air cleaner...and I know from experience, that any "low pressure" on the vent breather...is a Good Thing... why Drag Racers use Vacuum Pumps to evacuate bottom end!!!
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Stellar HDF Member
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From: australia
thanks ive had the trike for around 5 yrs and had sat unused before for about 3 mths with no issues.is the oil pump the same as a shovelhead ?that way i can trace where the crankcase breather hose goes from the pump. from what im reading here if its a stock set up like the evo it goes to the air filter ? this could be a check ball issue , correct ?
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From: Cental, MI
thanks ive had the trike for around 5 yrs and had sat unused before for about 3 mths with no issues.is the oil pump the same as a shovelhead ?that way i can trace where the crankcase breather hose goes from the pump. from what im reading here if its a stock set up like the evo it goes to the air filter ? this could be a check ball issue , correct ?
Identify if Head Breather, or Bottom Breather...First step
Pics of Right side of Engine should Identify!!!!
Edit; "Issue" suggests something is Wrong...May Not be the case.. One small drip a Day, into engine case, for 3-6 months, looks like alot of oil on the Concrete, when she ***** it Out!!!
Last edited by Racepres; Aug 9, 2023 at 05:23 PM.
HDF Community Team
Joined: Jan 2020
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From: Colorado
Bottom breather has the breather ports here,
While later evo top breathers had the breather ports at the top of the heads isntead.
As for the problem, its the tank oil that is making it way past the pump check valve that is filling up the case when the motor is off and sitting for any length of time, over just what should be falling from the upper motor during such down. When the bike is started up with too much oil in the case, it's being shoved out the lower breather,since the pump can not pull that excess oil out of the case fast enough to send back to the tank instead.
So check valve ball is #11 in the pump.
So on that note, drain the oil from the motor/ from the tank, pull the check valve apart and start with making sure there is not debris at the ball seat that is not allowing the ball to seat correctly and allowing it to leak. If nothing is obvious as the problem of why the check ball is leaking, then at least pick up a new check ball and spring. The old check ball can be used to make a tool to recondition the seating surface if needed. Hence either as a punch tool with is welded to a rod, or if you are going to lap the seating surface, then pump needs to be pulled, so you can clean out the lapping compound in the end.
Or as stated, seat may be fine, the ball has corrosion wear, or spring has gone weak, and just new spring and ball may solve the check ball leaking problem with their replacements alone isntead.
http://www.bigboyzheadporting.com/showthread.php?t=87
While later evo top breathers had the breather ports at the top of the heads isntead.
As for the problem, its the tank oil that is making it way past the pump check valve that is filling up the case when the motor is off and sitting for any length of time, over just what should be falling from the upper motor during such down. When the bike is started up with too much oil in the case, it's being shoved out the lower breather,since the pump can not pull that excess oil out of the case fast enough to send back to the tank instead.
So check valve ball is #11 in the pump.
So on that note, drain the oil from the motor/ from the tank, pull the check valve apart and start with making sure there is not debris at the ball seat that is not allowing the ball to seat correctly and allowing it to leak. If nothing is obvious as the problem of why the check ball is leaking, then at least pick up a new check ball and spring. The old check ball can be used to make a tool to recondition the seating surface if needed. Hence either as a punch tool with is welded to a rod, or if you are going to lap the seating surface, then pump needs to be pulled, so you can clean out the lapping compound in the end.
Or as stated, seat may be fine, the ball has corrosion wear, or spring has gone weak, and just new spring and ball may solve the check ball leaking problem with their replacements alone isntead.
http://www.bigboyzheadporting.com/showthread.php?t=87
Last edited by Dano523; Aug 9, 2023 at 05:28 PM.
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Stellar HDF Member
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From: australia
why couldnt the lapping be done with the pump on. with a small rag in the hole and a pair of tweezers to remove it. also a air compressor to blow out the residue before removing the rag
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Stellar HDF Member
Joined: May 2018
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From: australia
will a over filled oil tank cause the problem.mines about 1inch from the top. im just about to drain some out
Last edited by john lee; Aug 9, 2023 at 08:43 PM.
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From: Cental, MI
people add oil to a Cold Engine...Oops
