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Author Topic: Oil Leak, from a weird place  (Read 1395 times)

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Offline Bert_94

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Oil Leak, from a weird place
« on: April 22, 2015, 08:29:21 AM »
There is this oil leak that has pained me far too long. The area that the oil leaks from, behind the front drive sprocket; it's not the sprocket itself, but an area where the chain rubs against the engine.

I have tried sealing the area many times, the sealing only temporarily stops the leak after about a good one hundred miles the bike leaks again.

What I am wondering, is the chain not the right one? Or is there some type of spacer or washer that I am missing?

It's a pain, constantly resealing and adding oil; oil is not that cheap.
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Offline LesterPiglet

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Re: Oil Leak, from a weird place
« Reply #1 on: April 22, 2015, 08:37:45 AM »
Are you using an o-ring chain. O-ring chains are too wide and will eventually wear through the casing. Replace it with a standard chain and let's hope too much damage isn't done.
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Offline Bowswell

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Re: Oil Leak, from a weird place
« Reply #2 on: April 22, 2015, 08:49:30 AM »
the sprocket is on wrong side...it is a sprocket whit
 2 flat side?
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Offline flybox1

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Re: Oil Leak, from a weird place
« Reply #3 on: April 22, 2015, 08:58:50 AM »
+1 to both ideas above.  your chain has worn through.

a sprocket installed incorrectly would allow the chain to rub.
a (too wide) o-ring chain would rub.
both of the above might do the case in if not corrected.

wonder if that plug can be replaced without splitting the cases  :-\

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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline Tews19

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Re: Oil Leak, from a weird place
« Reply #4 on: April 22, 2015, 09:18:10 AM »
My buddy was able to replace that cap without splitting the cases.
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Offline Bert_94

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Re: Oil Leak, from a weird place
« Reply #5 on: April 22, 2015, 04:05:41 PM »
To LesterPiglet, if I replace the o-ring chain, because that is what is currently on, would that interfere with my torque? Also, a friend mentioned that a standard chain could bust because of torque. Could that possibly happen?

If not, I will replace with a standard chain.
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Offline Bert_94

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Re: Oil Leak, from a weird place
« Reply #6 on: April 22, 2015, 04:09:41 PM »
To bowswell, What does that mean exactly?

However, the sprocket appears to be the same on each side; flipping that baby around would appear to have no effect.

Could the sprocket be too wide? Or would getting a less wide sprocket be outrageous?
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Offline Bert_94

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Re: Oil Leak, from a weird place
« Reply #7 on: April 22, 2015, 04:11:12 PM »
Tews19, what is the name of this cap you mentioned your buddy replaced without splitting the cases?

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Offline flybox1

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Re: Oil Leak, from a weird place
« Reply #8 on: April 22, 2015, 04:15:13 PM »
Quote from: Bert_94 on April 22, 2015, 04:05:41 PM
To LesterPiglet, if I replace the o-ring chain, because that is what is currently on, would that interfere with my torque?   NO.  deviations from stock sprocket teeth will change torque.  Also, a friend mentioned that a standard chain could bust because of torque. Could that possibly happen? With these bikes?  hahaha....NO! ;D 

If not, I will replace with a standard chain.


the cap, and its part number can be found in the parts fiche...
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Bert_94

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Re: Oil Leak, from a weird place
« Reply #9 on: April 22, 2015, 06:37:38 PM »
Thanks, I appreciate the input from all.
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Offline bryanj

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Re: Oil Leak, from a weird place
« Reply #10 on: April 22, 2015, 11:30:44 PM »
NON O ring HD chain is fine for a 550, that plug is a very tight fit and easier to do with the casings split, not saying it can;t be done without splitting but you need to be VERY careful
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Offline LesterPiglet

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Re: Oil Leak, from a weird place
« Reply #11 on: April 23, 2015, 02:42:43 AM »
Lean your bike well over to the left so oil has no chance of reaching that bung. Clean the life out of it and try resealingwith a compound of your choice, you might get away with it. I would try an epoxy resin before I had to replace it.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


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Offline Eydugstr

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Re: Oil Leak, from a weird place
« Reply #12 on: April 24, 2015, 01:28:17 PM »
Quote from: Bert_94 on April 22, 2015, 04:05:41 PM
To LesterPiglet, if I replace the o-ring chain, because that is what is currently on, would that interfere with my torque? Also, a friend mentioned that a standard chain could bust because of torque. Could that possibly happen?

If not, I will replace with a standard chain.

Ran into this not too long ago on a neighbor's 550...The o-ring chains are just too wide for these bikes.  Diamond chain makes m/c chains for older H-D's, so they'll be able to handle the torque okay.  J & P cycles sells them pretty reasonable.  http://www.jpcycles.com/product/601-055
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Offline LesterPiglet

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Re: Oil Leak, from a weird place
« Reply #13 on: April 24, 2015, 02:01:22 PM »
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional
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