76 CB360 oil pressure, clogged filter (help!)

edukaycheon

edukaycheon

Been Around the Block
So lately, my bike has been shooting oil out of the clutch rod bearing. Not just dripping, a pretty strong stream. Today we took the crankcase open to find the cause of the pressure build up, and found that the oil filter is completely clogged and has to be replaced. Does anyone know if this could be the cause of the pressure? Right now that's how we're treating it, so along those lines does anyone have a new/relatively clean/intact oil filter they could send me? I'd pay of course, just looking for one and hoping I could get one for cheaper/faster than having to order online, with all the holiday rush.

P.S.: There are bits of rubber around the shift rod, which make it look like the pressure is breaking apart the rubber and shooting it into the fuel strainer, which explains some of the gunk on it.

hVAap.jpg


Here's a picture of the strainer. It's disgusting.

If anyone does have the part, it would be part number 15421-388-000 :D
 
I'd agree with PJ, that a clogged strainer will not create a higher oil pressure. That strainer is a mess and needs to be washed clean. The centrifugal filter also needs to be cleaned out.

Next issue to address is what is all that metal and where is it coming from? It looks almost like a cam chain tensioner breaking up or cam bearings failing, but most likely to be cam chain related I think. That needs to be investigated and fixed.
 
likely the tensioner from the rubber bits, the silver bits are probably from a whipping cam chain, when you change the oil in your bike, the silvery tint is from the cam bearings failing and the lack of lubrication on the cylinders and the small ends failing...
 
You don't need a new stainer. You need a new engine. For there to be that much debris in the oil pick up stainer, your engine is probably fucked up pretty badly.

As was already said, clogging of that screen would not cause excess pressure. It is the oil pickup strainer on the suction side of the oil pump, (not an oil filter,) and it being clogged would reduce the amount of oil flowing to your engine. Something is getting chewed up in your engine, and nothing short of a complete tear-down is required. All that shit that is in the strainer will be all through the engine, in the bearings and the passageways. The engine could even be beyond repair. You will find a huge mess when you get in there.
 
Okay I'm home now, I posted from the shop on my guy's computer.
What you guys are saying makes sense, for all that gunk to be on there I'm sure the internals don't look too great. My mechanic seems to be pretty sure that replacing the oil filter would fix the pressure problem, if the fuel pump is sucking oil but nothing's getting through because it's clogged, couldn't the clog cause a pressure buildup instead of a fluid transition? Does anyone have any ideas what the pressure problem could be if not this?
 
Suction and pressure are opposites. That clogged screen is on the suction side. It CAN'T cause excess pressure.

You are hung up on the idea that you have too much pressure causing your leak. Get off that idea. What you have is a fucked up seal because of all the crap that has been in your oil.

You only have one course of action, and that is engine tear down. Your mechanic is wrong. No way in Hell could there be that much shit in the oil strainer without there being engine damage, which is where all that shit came from. That shit used to be part of your engine. Your problem is not shit in the pick up strainer, your problem is that the shit exists at all.
 
Thanks for the advice, not something I'd like to hear but I'll go back and see what we can do. Also, I'm not saying the pressure is causing the leak, of course there has to be a problem where the oil is coming out, but I'm saying the oil isn't just dripping out, it's shooting out in a stream horizontally from the clutch rod bearing (around the sides, not from where the clutch rod goes).

7T9oP.jpg


That's leading us to think that the engine isn't breathing properly, but we checked and it seems to be, so besides that I'm not sure why the oil is coming out like that. I'm relatively new to bikes so it could just be my lack of knowledge, but that doesn't seem right.

When we were cleaning the bike up for today, we noticed some bits of rubber on the clutch rod (I believe) that looked like it could be part of the gunk on the filter.

Appreciate the help so far
 
Two things need to be changed immediately, your oil and your mechanic. Both are obviously no good. ;-) Your mechanic is on the wrong track and if he thinks that cleaning the crud off is enough to fix a problem he needs to go back to school.

The leak is oil leaking past the seal in the side cover. It could be that oil feeds to the head are clogged and all the flow is going through the transmission or it could be that the bores are worn and crankcase pressurization is causing the leak.

With that much debris the motor has to come out and be completely stripped, cleaned and inspected.
 
teazer said:
It could be that oil feeds to the head are clogged and all the flow is going through the transmission or it could be that the bores are worn and crankcase pressurization is causing the leak.
Click to expand...

I think you are absolutely correct.
This engine is hosed.
 
Uh, where is the seal that's supposed to be in the hole?
Metal on strainer looks like its part of the cam chain 'horseshoe' pivot, cam bearings are 'different
Blocked strainer will prevent oil pressure getting too high so a constant flow to top end may actually have saved it (unlikely but possible)
That motor must have been rattly as hell?
It's going to need a minimum of top end strip for investigation and probably full bottom end to fix tensioner pivot
Have you had any drive chain problems?
 
edukaycheon said:
Thanks for the advice, not something I'd like to hear but I'll go back and see what we can do. Also, I'm not saying the pressure is causing the leak, of course there has to be a problem where the oil is coming out, but I'm saying the oil isn't just dripping out, it's shooting out in a stream horizontally from the clutch rod bearing (around the sides, not from where the clutch rod goes).

7T9oP.jpg





That's leading us to think that the engine isn't breathing properly, but we checked and it seems to be, so besides that I'm not sure why the oil is coming out like that. I'm relatively new to bikes so it could just be my lack of knowledge, but that doesn't seem right.

When we were cleaning the bike up for today, we noticed some bits of rubber on the clutch rod (I believe) that looked like it could be part of the gunk on the filter.

Appreciate the help so far
Click to expand...

whoa, wait, that's how the crankcase is now??? or did you take the clutch rod seal out before shooting the pic? if your mechanic is suspecting an oil filter but missing the fact that the seal is gone, you need to never ever ever bring anything to him again, not even a blender
 
The fact that the clutch pushrod is also AWOL suggest to me that the seal was a loos fit and came out with the pushrod. That mechanic is still a twit, but I don't think they missed the seal and pushrod.
 
Took that picture after we took the seal out and the pushrod. I'll talk to my mechanic about what you guys said (except for the part where he's a bad mechanic, because no matter how good or bad he is, he's a nice guy and doesn't deserve to hear that) once he comes back in after Christmas. Seems like the general consensus is that I need to get into the motor, so I foresee a lot of work. Again, thanks all, I'll keep this thread updated.
 
I'm less politically correct than the others so I'll say it. He needs to know that he is so far wrong it's not funny. This is not about him being nice or any sort of insult to him as a person. Just his professional opinion is way off in this case.

It is however, entirely possible that he thinks the motor is junk and not worth spending a lot of money on and that he suggested an oil change as a cheap way to get that out of his shop. So it's possible that he was trying to protect your feelings. So he's a nice guy, but some of us disagree with what he suggested.
 
The inverted 'Y' shaped pieces are the oil feeds to bearings, you can just make out the opening at top left.
Metal pieces in sump are bad news but the 'leak' may just need a new seal?
 
I'm with Teaser on this. Your mechanic is waaay off the mark in his advice. He can learn from it or not. Your choice.
 
I know a bit about 360 motors, ;)
It's possible to completely strip motor, shorten a heavy duty CB750 'race' cam chain (and rivet it back together at 360 length), strip and check oil pump, check transmission forks and gears then reassemble and have owner ride it away in 10 hrs without actually working too fast or hard (I know because I've done it)
Crank is probably OK as it doesn't need much oil, big ends rely on a centrifugal feed and don't rely on any pressure feed cam bearings and tensioners will probably be an issue which is why I say strip top end.
That should only take an hour
 
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