I've got an oil leak, can you help me diagnose the source? - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 33 (permalink) Old 02-12-2017, 11:33 PM Thread Starter
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Question I've got an oil leak, can you help me diagnose the source?

Hi folks,

I've got a 1983 VT750 and I've got an oil leak that appears like it should be fixed before spring riding season.

I had some trouble trying to describe where it stems from, as my technical language around mechanics is .. non-existent, really. So to make up for that, I put together a quick video that gives you a clear idea of the origin and extent of the oil leak(s):


Have any of you Shadow owners with older bikes experienced this? If so, what was the cause the solution in your case? Was it necessary to remove the engine and do a full replacement of gaskets, or is it something simpler like an O-ring that needs replacement?

Thanks in advance!

Vlado

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post #2 of 33 (permalink) Old 02-13-2017, 08:04 AM
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That is a plug there is no oring in that spot. It does not just pop out, atleast it's not intended to. To replace it you have to take those top pieces off the bike. Mine used to slightly leak, when I did my rebuild I just used some silicone to seal them up. You should be able to get a new one if you want but I'm thinking your not going to have room to take it apart in the frame.

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post #3 of 33 (permalink) Old 02-13-2017, 10:10 AM Thread Starter
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Thanks for the quick reply! What kind of silicone did you use, and how has it held up over time?

Would something like this work?

https://www.permatex.com/products/ga...licone-gasket/

I also saw this one recommended, although it seems it has a lower top-end temperature rating.

https://www.permatex.com/products/ga...asket-maker-4/

Last edited by vlado; 02-13-2017 at 10:18 AM.
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post #4 of 33 (permalink) Old 02-13-2017, 10:49 AM
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I used black oil resistant gasket silicone. It's held up just fine. If you use silicone rather than replacing the plug just wipe off the excess that squeeze out after you tighten it all down and no one will be able to tell the difference.

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post #5 of 33 (permalink) Old 02-13-2017, 10:51 AM
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Being the front cylinder you might be able to take the coils and the coolant lines off and do the job with the engine in the frame. The coils and coolant lines would be taken off to remove the engine anyway.

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post #6 of 33 (permalink) Old 02-13-2017, 02:10 PM Thread Starter
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Thanks Bigolepit, I found the silicone stuff at my local Canadian Tire and will do some oil cleanup before applying it to the plugs. I'll report back with progress. Hopefully there's a warm enough day to turn it on and see if it holds
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post #7 of 33 (permalink) Old 02-13-2017, 03:36 PM
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It is a common problem on these older bikes. Mine were seeping a little when I got it from a friend and then I put in Synthetic oil and it made it worse, seems that synthetic will clean out any gummed up residue that was keeping the oil from seeping out of gasket joints. I tried to seal it from the outside and it work for a very short time. You can't stop oil from seeping through a seam very well after it has made a channel. To take it apart plan for a top end overhaul however, with all the gaskets.
Here is a photo of what the rubber plug seal and head looks like.
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Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #8 of 33 (permalink) Old 02-13-2017, 03:48 PM Thread Starter
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Thanks for the pictures, Swifty! It certainly helps to see what I'm looking for inside. I'm hoping the silicone seal holds up this year, then I can plan for a rebuild starting early winter and giving myself ample time to do it.
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post #9 of 33 (permalink) Old 02-13-2017, 05:47 PM
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Mine doesn't leak as bad as yours so I am putting off tearing into it. I hate to take apart an engine if it is running good and no other problems. If you are willing to experiment, here is a though I had considered. The holes are 22 MM so a 7/8 inch expanding rubber plug would be able to seal it well without engine disassembly.
It looks like the factory plugs have a metal body with rubber coating. So they may pull out with a hole drilled in the center and a screw into that, just like taking out the carb mixture screw plugs. After the bore is cleaned out an expanding rubber plug could stop the leak. It may sound a bit "mickey mouse" but it would sure save a lot of money and time. What do you think?


7/8" Rubber Expansion Plug/Rubber Freeze Plug/ Exhaust Pressure Test Plug/ | eBay

0.875 inch wing nut action neoprene rubber stainless steel expansion test plug

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #10 of 33 (permalink) Old 02-13-2017, 06:48 PM
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Can always count you @swifty2014 for good pics of a repair lol. I didn't put silicone on the outside of mine to be clear, when I had it apart I put the silicone on the radius of the plug as if It was a gasket. It's better to replace them if you can but I haven't had any leaks from it since then.

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