Perplexing Oil Leak Solved!! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 07-12-2007, 06:11 PM Thread Starter
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Perplexing Oil Leak Solved!!

Just in case anyone might have the same problem........I had an oil leak that I just could not track down. This went on for quite a while. I kept seeing oil on the ground but could not trace the source, It seemed to be coming from near the crankcase breather tube fitting. Well, after reading on this forum somewhere that there was a weep or drain hole in this area for the spark plug tube, I got to thinking. This weep hole is supposed to let WATER drain from the two recessed spark plug tubes after washing your bike getting wet from rain. As it turns out the O-rings on the spark plug tubes were old and oil was getting into the tube and exiting thru the weep hole. I replaced the 4 o-rings ( two in each tube) and my leak is gone

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post #2 of 9 (permalink) Old 07-12-2007, 06:19 PM
 
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awesome!

Sometimes even the most difficult of problems are easilly solved!!
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post #3 of 9 (permalink) Old 07-12-2007, 10:18 PM
 
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I've got a mysterious leak that I haven't found. Where exactly is this fitting?
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post #4 of 9 (permalink) Old 07-12-2007, 10:37 PM Thread Starter
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The "exit" hole on the front cylinder head cannot be seen with the radiator on. Perhaps with a mirror you can see it. I can reach it with my finger though. Looking at the bike from the front, it would be slightly to the right(riders left) and below the crankcase vent fitting where the plastic tube leaves the engine and goes to the air box. there is an identical hole on the rear of the rear cylinder head. If this hole is not clogged up, any water that you put in the spark plug tube should exit this hole. This would be the spark plug on the riders left on the front cylinder and the riders right on the rear cyliner. Keeping the spark plug in place so as not to allow any water to enter the engine, pour a small amount of water in the spark plug tube ( I think it is called a spark plug retaining tube) and see if you can see where the water exits. Once you have located the hole on the front and the rear, run the bike and see if there is any oil coming from the hole. If there is, then the o rings are bad. the retaining tubes can be removed using a 27mm nut (if you cant locate a nut that fits, the rear axel castle nut will work. If the drain hole is plugged, oil will come out of the spark plug tube as it fills up, you can clear the hole and passage with a piece of wire.
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post #5 of 9 (permalink) Old 07-12-2007, 11:26 PM
 
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Thanks for the info Cheman. I'll have to check into it.
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post #6 of 9 (permalink) Old 07-13-2007, 04:39 AM
 
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Nice one fella!
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post #7 of 9 (permalink) Old 07-13-2007, 10:30 AM
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That's some great info! Good job!

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post #8 of 9 (permalink) Old 07-16-2007, 01:59 AM
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That's interesting I'll have to check it out. Mike
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post #9 of 9 (permalink) Old 07-16-2007, 10:05 PM
 
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Great piece of detective work, Cheman... Guess I need to see if that is where my mystery oil leak is coming from...
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