Author Topic: oil tank breather fron hell , someone please help (Read 6270 times)

Dr Rockso · « **on:** May 10, 2007, 12:19:48 PM »

i got this oil tank (thanks terry) but the connections are different from the ones on the tank i have . how do i hook this thing up ? mine has the breather on the top , and a line in the side for the hose from the back of the transmission . on this new one it looks like the breather is in the bottom (or thats for the trans line and there is no breather) and the fittings for the oil lines don't look like they're the same size . will this even work on my k0 ?

ProTeal55 · « **Reply #1 on:** May 10, 2007, 12:27:05 PM »

What kinda bike you got ?
(empty out that ashtray man !!

)

Dr Rockso · « **Reply #2 on:** May 10, 2007, 12:28:41 PM »

i have a k0 with a k2 engine in it . my current oil tank won't stop puking oil out the breather and has a big dent in the side . seems like every time i stop i'm treated to a wet foot from the overflow .

edit: mine is like this one

mlinder · « **Reply #3 on:** May 10, 2007, 12:32:06 PM »

I don't see a breather hose on that tank either.
My K0 has the 2 on the 'bottom' and the breather as well.
Was the breather tube attachment 'removed' from the tank pictured?

Dr Rockso · « **Reply #4 on:** May 10, 2007, 12:33:49 PM »

on the bottom pic the breather is at the top ,that round circle with the elbow fitting . on this new tank it's on the bottom .

mlinder · « **Reply #5 on:** May 10, 2007, 12:36:49 PM »

Why does your K0 oil tank look completely different than mine?
I'll pull mine off tonight and take a pic for you.

Dr Rockso · « **Reply #6 on:** May 10, 2007, 12:40:50 PM »

the guy i got this bike from pieced it together from a few different cb's of different years . my current oil tank is the same as the one on my friends 74 . according to the ebay auction this is for a 70 cb750 , maybe thats why mine keeps puking oil . but either way this new tank doesn't have the connection on the back for the hose that goes to the back of the transmission so i'm not sure what to do .

Dr Rockso · « **Reply #7 on:** May 10, 2007, 12:57:38 PM »

and see , this k0 diagram shows the oil tank i already have with the breather on the top . man i wish this bike would cut this crap out , i'm getting really tired of spending money on a bike i can't ride .

mlinder · « **Reply #8 on:** May 10, 2007, 01:00:27 PM »

Oh, looking at it again, your tank and my k0 tank are the same. I thought the elbow tube in teh second picture was on TOP of your tank, not on top the uh, protrusion, there. So it's the same as mine.

Dr Rockso · « **Reply #9 on:** May 10, 2007, 01:07:17 PM »

hmmm , i'm starting to think this new tank is for a 76 or something . anyone know if it'll work .....or wanna take a stab at why mine won't stop overflowing when i hit the brakes . it's not over filled , lines are new and clear . it makes no sense and if i miss any more riding because of it i'm going to kill this bike . literally .....theres a plasma cutter and a 4 foot wrecking bar here , i have a ton of money in it that i'll never be able to get back out of it and if i have to kill it to teach it a lesson i will .

mlinder · « **Reply #10 on:** May 10, 2007, 01:18:39 PM »

I think you've been asked this before.. but.. how much oil do you have in there?
The oil would need to be filling the tank in order to get out of the overflow tube :/
I don't think it's the tank. Either the pump isn't pulling new oil out of the tank, while it's still pumping it OUT of the block back into your tank (making your bike run without oil), or you have just too much oil in there.
When you changed the oil, how much did you take out? Oil filter and all? drain form crank case, oil filter and tank drain?
How much did you put back in??

Dr Rockso · « **Reply #11 on:** May 10, 2007, 01:24:50 PM »

3 quarts , when i changed the oil i drained the filter , oil pan , and tank . not a whole lot came out since it'd been spewing it all over my leg . but even with it as low as it was it'd still dribble out when i came to a stop . put in a new filter , and filled the tank with 3 quarts , kill switch off kicked it till the oil pressure light went off . came to a stop and supprise supprise , oil ,plenty of it . the oil light never flickers , and the engine runs great , nothing out the valve cover breather except alittle vapor . but this oil tank just won't quit overflowing . i'm at witts end and completely out of money now ( it's all inside the bike now) there is no reason at all it should do this , the only possible thing i can think of is the breather assembly inside the tank has a drain to let oil that gets in there go back into the tank instead of out the breather . that could be plugged up , but theres no way to get to it because it's inside the tank . i so hate this bike

edit: and it seems more like a sloshing problem , if i hold the front brake and rock the bike once it's warmed up i can get oil out the breather too .

mlinder · « **Reply #12 on:** May 10, 2007, 01:27:51 PM »

Quote from: Dr Rockso on May 10, 2007, 01:24:50 PM

3 quarts , when i changed the oil i drained the filter , oil pan , and tank . not a whole lot came out since it'd been spewing it all over my leg . but even with it as low as it was it'd still dribble out when i came to a stop . put in a new filter , and filled the tank with 3 quarts , kill switch off kicked it till the oil pressure light went off . came to a stop and supprise supprise , oil ,plenty of it . the oil light never flickers , and the engine runs great , nothing out the valve cover breather except alittle vapor . but this oil tank just won't quit overflowing . i'm at witts end and completely out of money now ( it's all inside the bike now) there is no reason at all it should do this , the only possible thing i can think of is the breather assembly inside the tank has a drain to let oil that gets in there go back into the tank instead of out the breather . that could be plugged up , but theres no way to get to it because it's inside the tank . i so hate this bike

edit: and it seems more like a sloshing problem , if i hold the front brake and rock the bike once it's warmed up i can get oil out the breather too .

Well, the newer oiltank appears to not need a breather. So #$%* it, put it on without a breather. No breather, no place for oil to get out.

Dr Rockso · « **Reply #13 on:** May 10, 2007, 01:30:27 PM »

the new oil tank has a breather , but it exits out the bottom of the tank via a tube that runs up to.....something near the top of the tank inside . i'd put it on but then i'd have nowhere to run the line from the back of my transmission to , and then that would probably start puking oil everywhere .

on the tank i have on the bike right now i cut a small section of hose and jammed a metal pin into the end to block the breather off . but no one would tell me if that would cause any problems or not .

Jinxracing · « **Reply #14 on:** May 10, 2007, 01:55:08 PM »

Dude, sounds like your bike is trashed and ready for the junkman...wanna sell it to me cheap?

I'm kidding btw. Seriously, it sounds like you've got a difficult to diagnose patient on your hands there Doc. The first logical step to isolate the problem is to hook up that other oil tank. Connect that breather hose to the new tank somehow and try it out. If it still pukes oil you know the problem lies somewhere else...if it stops pissing oil on your leg, then you know your oil tank was to blame. Then you can move forward and either get an oil tank that you like, fix the K0 tank, or just run the new one that you've got.

Dr Rockso · « **Reply #15 on:** May 10, 2007, 02:05:36 PM »

but what about the transmission hose , theres nowhere to put it on this new tank .

Dr Rockso · « **Reply #16 on:** May 10, 2007, 02:45:18 PM »

anyone ? what does that transmission line even do . what would happen if i block off the breather on my tank , and what would happen if i blocked off the transmission line .

Dr Rockso · « **Reply #17 on:** May 10, 2007, 05:33:12 PM »

so am i like the only person in the history of cb750's to have this problem ? i've been trying to solve this for weeks .

mcpuffett · « **Reply #18 on:** May 11, 2007, 02:08:36 AM »

Hi Doc, don't know if i will be much help but i will try on my ko the bottom breather goes to the crankcase tube and the top breather just goes to ground , cheers mick.

Terry in Australia · « **Reply #19 on:** May 11, 2007, 02:35:01 AM »

G'Day Tim, I'm glad you received the tank, but can you confirm that there is a "spiggot" for fitting the crankcase breather tube at the bottom of the tank? The routing should be as follows:

The crankcase breather (at the rear of the transmission) is connected to the LOWER spiggot, and the hose out of the TOP of the tank is directed down near the rear wheel.

The top breather tube (from the head) just runs over the top of the airbox into the atmosphere. (NOT connected to the oil tank in any way)

It's quite possible that if you're trying to connect both breather tubes (the one from the crankcase AND the one from the head) you may well be pressurising the oil in the oil tank, causing it to overflow all over your leg! Cheers, Terry.

Dr Rockso · « **Reply #20 on:** May 11, 2007, 10:56:25 AM »

basically this is what i'm saying

thats the problem i'm having hooking the new tank up .

the main problem tho is when i stop oil comes out the breather of my old tank , the only thing i see wrong with the old tank is this dent

aside from that everything is hooked up as it should be , correct ammount of oil , engine runs great ......see why i'm so confused ?

and just to be clear , the breather isn't steadily pumping out oil , it only does it when i put on the brakes or rock the bike back and fourth . and only once the oil is warmed out . it's actually sloshing out the breather . i don't think pressure has anything to do with it .

Jinxracing · « **Reply #21 on:** May 11, 2007, 11:08:26 AM »

Am I missing something? Why don't you connect the rear case breather to the breather inlet on the bottom of your new tank and try it out?

mcpuffett · « **Reply #22 on:** May 11, 2007, 11:12:04 AM »

thats one big dent in that oil tank and i don't think it will help matters , your old tank is the same as my ko's and your new tank is the same as my f1's, try connecting the breather pipe as jinx is saying

good luck , mick.

Jinxracing · « **Reply #23 on:** May 11, 2007, 11:27:40 AM »

Quote from: Dr Rockso on May 10, 2007, 02:45:18 PM

anyone ? what does that transmission line even do . what would happen if i block off the breather on my tank , and what would happen if i blocked off the transmission line .

After re-reading your posts it sounds like you're thinking that the breather hoses are critical oil transmission lines...they're not. You may be making this more complicated than it needs to be.

As far as I know, you can vent the breather ports on the engine any damn place you like...they exist just to keep the engine from becoming internally pressurized. You've probably seen those little oil breather caps that look like small pleated air filters? Same deal, they just vent to atmosphere. I assume that Honda ran hoses back to the tank so that any small amount of oil that did come through the breathers would be recaptured into the oil tank rather than dribbling out onto the surface of the engine or onto the ground. Especially that rear case breather port...any oil that might come out of there would be in a good place to cause a quick loss of rear traction!

If any of the more knowledgeable members want to correct me on the above, please do!

Dr Rockso · « **Reply #24 on:** May 11, 2007, 11:33:36 AM »

but if i connect the hose on the back of the transmission to the oil tank overflow then if it does overflow it'll dump all that oil into my engine instead of the ground , is that ok ?

is the new tank not supposed to have a breather tube to the ground like the old one ? how is it any different than just plugging up the breather on my old tank ?

dusterdude · « **Reply #25 on:** May 11, 2007, 12:46:45 PM »

one thing im not sure has been brought up,that dent in your stock tank,its big enough that it will displace a bit of oil,if you put the recommended amount of oil in the tank,it may be too much because of that dent.just a thought.

Dr Rockso · « **Reply #26 on:** May 11, 2007, 01:11:45 PM »

even with the oil level super low it'll still slosh out

dusterdude · « **Reply #27 on:** May 11, 2007, 01:58:09 PM »

damnit jim

Terry in Australia · « **Reply #28 on:** May 11, 2007, 05:11:16 PM »

Just try hooking that new tank up Tim, and let us all know if it fixed the problem? You might have some internal damage in your old thank that is allowing the oil to run out once it gets hot and thins? You'll only know, if you give it a go! Cheers, Terry.

Dr Rockso · « **Reply #29 on:** May 11, 2007, 05:39:14 PM »

thats the problem tho ,to hook up this new one i'd have to put the transmission line onto where the breather goes . with the breather now going to the transmission theres no way to see if everything is coming out the breather . but i pm'd a few people and it's sounding like blocking off the breather off the oil tank isn't that big of a deal since the engine can still breathe out the valve cover . that being the case i'm probably going to hook up the new tank since it doesn't have the big dent in it .

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Author Topic: oil tank breather fron hell , someone please help (Read 6270 times)

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