Oil from front cylinder spark plug sleeve - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 07-24-2017, 03:22 PM Thread Starter
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Question Oil from front cylinder spark plug sleeve

I noticed oil coming from front cylinder spark plug sleeve. I pulled the sleeve and the cam chain had worn a hole in the aluminum (?) sleeve on a slight angle. Looking in the hole I can see the chain and the shavings. The chain will interrupt installation of a new sleeve. Has anyone seen this before and can suggest how to remedy the problem.
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post #2 of 9 (permalink) Old 07-24-2017, 03:40 PM
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only thing I can think of is loose cam chains. check the tensioner. always recommend replacing with manual instead of automatic, since the automatics always seem to fail (the spring in them gets weak or breaks)

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post #3 of 9 (permalink) Old 07-24-2017, 04:26 PM
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what about the o-ring that seals the deep spark plug well? https://www.vn750.com/forum/31-engine...eak-issue.html read this thread.if you get the chain adjusted properly it should not interfere with the well and should put in new orings for good measure. oh,and would you mind doing an introduction in the newbie section?

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post #4 of 9 (permalink) Old 07-24-2017, 07:40 PM
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It might be worn chain guides letting the chain rub the plug sleeve.

Have you ever seen black rubber shavings in the oil screen? The guides are rubber coated aluminum. Have seen where a few people have had to replace worn chain guides. First I've heard of a hole worn in the plug sleeve though.

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post #5 of 9 (permalink) Old 07-24-2017, 11:04 PM
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Even worn they don't sling that far out. Something else is wrong. The chain doesn't cross into the path of the sleeve so not being able to put the sleeve back in indicates a larger issue.


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post #6 of 9 (permalink) Old 07-25-2017, 12:40 AM
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Which cylinder had the damage? edit - Just watched Andrew's rebuild part 1. Both plug wells have timing chains with them.

Does it have MCCTs and someone over tightened them?

Does it look something like this? This is on a VN1500, web page says he had to extend the chain tensioner, so the chain must have been loose on this one.

Tear it up, fix it, repeat: Vulcan 1500/1600 Sparkplug Tube Tool 27mm Hex


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post #7 of 9 (permalink) Old 07-25-2017, 07:27 AM
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I'm inclined to agree with Spockster on this. It looks like the chain has stretched. By keeping the proper tension on the chain, the chain guide/tensioner is pushing it further toward the center of the cylinder than it should be able to causing it to rub on the plug sleeve.

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post #8 of 9 (permalink) Old 07-25-2017, 01:50 PM
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Definitely worn chain and tensioner (both) where i had the issue is where he said it wouldn't go back in with the chain in the way. I can put the tubes in with the tensioner completely off. For it to be that far off sounds like more. The chain guide seems to not be in place.


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post #9 of 9 (permalink) Old 07-25-2017, 02:17 PM
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If there happens to be a lot of slack in the chain, it might be a matter of rotating the crank a little to get the chain out of the way. But that's not curing the rubbing chain problem.

Waiting for the OP to come back with more info.

ACCT or MCCT?

There's a lot of guides in this engine, of all shapes and sizes.

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