Bleed Lines and Why ???????

[Liberator*21]

Still being a newbe at this and learning something new everyday.

Can somebody explain (in detail and plain english) "Motor Bleed Lines" and why they're needed and what happens if they're not used/plugged up..........????????????

I noticed that some bleed lines come from the center of a cylinder, and some come from in between the cylinders ???????

[rock]

Bleed lines pump fuel/oil from reed cages back into cylinders. Fuel/oil will puddle in the bottom of the cages and can create a rough idle. Those lines come from the sides of the cylinders. The ones in between cylinders are the oiling lines for the center mains.
Rock

[Liberator*21]

I'd have to disagree on the center bleed lines.

My 96 250 has the bleeds coming out from between the the cylinders, going to a manifold block, then a single line from the manifold block to a filter and back to the VST. This routing is per the manual too.

[HStream1]

I'd have to disagree on the center bleed lines.

My 96 250 has the bleeds coming out from between the the cylinders, going to a manifold block, then a single line from the manifold block to a filter and back to the VST. This routing is per the manual too.

Rock is right on :thumbsup: the center lines are oilers for the center mains. Maybe if you understood how a two stroke works the routing of those lines would make more sense. And why did you ask the question if all you were going to do is disagree.

[skydog]

Yea for sure...:rolleyes::rolleyes:

[squirtboat]

I know I do not know much about 2 stroke so when one of these guys tells me something I believe them and do not argue!

I am jetwash 127 but my work comp won't let me sign that way.

[Liberator*21]

Rock is right on :thumbsup: the center lines are oilers for the center mains. Maybe if you understood how a two stroke works the routing of those lines would make more sense. And why did you ask the question if all you were going to do is disagree.

Damm boys, we have'n a little PMS today..............some of you are a real trip.

Ok smart guys, then you tell me why the Merc manual doesn't show it as that, look it up man, it's not hard, even I was able to do that...........

I disagreed because that's not what the manual shows, simple as that. If you smart asses would quite trying to act so high and mighty there might be more of an education available instead of your "I know everything attitude".

[rock]

He might be right. Had he posted it was a 3.0 I would not have replied. I know very little about them. What I posted applies to a 2.0, 2.4, and 2.5.
Rock

[Bruster]

Might be, but the general premice behind the bleed system is to recirculate puddled fuel back to the motor where the fuel can become useful in some way. Without the bleed system, 1, it would be difficult to get sufficiant lubrication to the main bearings, especially the upper main, which is out of the way and above any lubrication that could fall from above, and 2, the puddled fuel would cause the motor to run rich whenever there was enough fuel to disrupt the normal fuel system. Once this fuel was consumed it would run normally.


He might be right. Had he posted it was a 3.0 I would not have replied. I know very little about them. What I posted applies to a 2.0, 2.4, and 2.5.
Rock

[Liberator*21]

Might be, but the general premice behind the bleed system is to recirculate puddled fuel back to the motor where the fuel can become useful in some way. Without the bleed system, 1, it would be difficult to get sufficiant lubrication to the main bearings, especially the upper main, which is out of the way and above any lubrication that could fall from above, and 2, the puddled fuel would cause the motor to run rich whenever there was enough fuel to disrupt the normal fuel system causing the motor to run good until again there was enough fuel puddled to cause a rich condition. Once this fuel was consumed it would run normally.

You guy's are right, my bad for not stating we're talking 3.0L.

Bruster: Thank you for an educational answer that I understand.

To simplify here's the sketch's from the manual, can't aruge about these..................

http://i45.tinypic.com/2cs9i76.jpg
http://i47.tinypic.com/144qwy.jpg

[HStream1]

Damm boys, we have'n a little PMS today..............some of you are a real trip.

Ok smart guys, then you tell me why the Merc manual doesn't show it as that, look it up man, it's not hard, even I was able to do that...........

I disagreed because that's not what the manual shows, simple as that. If you smart asses would quite trying to act so high and mighty there might be more of an education available instead of your "I know everything attitude".




I don't think any body was trying to be a Smart Ass, If I came across as a Smart Ass then I sincerely appoligize. But, A correct answer was given and then it was disputed.

As far a it being a 3L (like Bruster cleared up) the principal remains the same they are just plumbed differently using a distribution block. But Items 5 & 12 still feed the center crank bearings. While items 14 & 15 feed the upper and lower crank bearings.

Peace :cheers:

[Liberator*21]

Bud,

Ok man I'm with you.....Let just forget the whole thing and start over. It's all good.:cheers: I may still be somewhat confused.

Here's my take on it following the lines in the diagram..........
The lines from the Cyl.'s going to the manifold block are feeding the 3 most forward lines (Crank) and the excess is pushed through the single line to the VST as an overflow ?

[HStream1]

The VST (Vapor Seperator Tank) provides a clean bubble/vapor free fuel supply to the high or medium pressure pump on some motors. It is also for return fuel and as a mixing chamber for the two stroke oil thus feeding bearings. Without this system how would the bearings be properly lubericated at high RPM.










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[Liberator*21]

I yanked the VST and run 100% pre-mix. Where the bleed filter line used to go in the VST, it now goes to the intake nipple that's ported before the throttle plate.