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post #1 of 11 (permalink) Old 02-15-2018, 08:57 AM Thread Starter
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S3 Has Sprung A Leak

I need some assistance from the smart folks on this forum. I have an oil leak that appears to be coming from head gasket area on the front left of the engine. I can't really see where it's coming from and I spoke with a reputable mechanic about it yesterday.

He said that if one or more of the spark plug tower seals was leaking that there is a passage that would take this leaking oil out to the front of the motor and that would be the cheap and easy fix instead of a new head gasket. He told me to check this first. So I just took off everything to look down at the plugs. There does appear to be a small leak as there is some oil around spark plug number one. The other two are clean. As I did the valve adjustment a few months ago and replaced the gaskets this would be my fault. No biggie, I can fix it.

My question is, does this hole that the mechanic talked about really exist? I've never heard or seen of such a passage. When I look down in to the spark plug towers I don't see anything and I've never seen it on any other bike I've had.

The mechanic in question works on all sorts of bike and I have a lot of confidence in him. Is he correct?

Thanks...j

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post #2 of 11 (permalink) Old 02-15-2018, 04:28 PM
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Even if the plug towers had drain holes in them - they don't - that still doesn't answer the question of where the oil is coming from.
Sounds like the leak might well be from the valve adjustment you did previously - worth checking those gaskets.

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post #3 of 11 (permalink) Old 02-15-2018, 08:37 PM
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Is there any way to get a clear pic of the location of the leak. Valve cover and head gasket are far removed .

On the left , it is not very possible to get an oil leak . Just coolant and combustion gas in there. ON the right there is the timing drive stuff , but still very unlikely to leak .

Valve cover is more likely your issue .
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post #4 of 11 (permalink) Old 02-16-2018, 01:53 AM Thread Starter
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Originally Posted by DieselGeek View Post
Is there any way to get a clear pic of the location of the leak. Valve cover and head gasket are far removed .

On the left , it is not very possible to get an oil leak . Just coolant and combustion gas in there. ON the right there is the timing drive stuff , but still very unlikely to leak .

Valve cover is more likely your issue .
Agree that it is unlikely to be the head gasket. I can't see where it's coming from but seems to be slightly above the head gasket but below the valve cover gasket which leaves...nothing. Next I'll pull the valve cover off and check around that as there is for sure a leaky tower gasket so I have to go in anyway. I'm hoping the valve cover is leaking as well. Only explanation I can come up with until I pull the radiator off and get a good look.

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post #5 of 11 (permalink) Old 02-16-2018, 08:20 AM Thread Starter
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Does anybody know what the 8mm bolt on the front of the engine (cylinder 1) is for? Looking through the shop manual there is no mention of it so I don't know what it is and therefor don't know what torque it should be.
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post #6 of 11 (permalink) Old 02-16-2018, 10:54 AM
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I believe it is a drainplug for the coolant around the cylinder liners.
See part numbers 10&11 here http://www.worldoftriumph.com/triump...lock_03=610370

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post #7 of 11 (permalink) Old 02-16-2018, 12:52 PM Thread Starter
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Well if that's the case I guess there is no oil leaking out of there! LOL

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post #8 of 11 (permalink) Old 02-19-2018, 12:38 PM Thread Starter
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I've dug in and removed the valve cover. There is no obvious leak that I can see. Is there some sort of seal between the cam shaft ladder and the head? I have had this carrier off but don't remember seeing anything and I wonder if the oil leaking into the #1 spark plug tunnel could be coming from there. First pic is the #1 spark plug. Second pic is #2. You can see the oil in #1.

The only evidence of anything so far is the middle front valve cover bolt was definitely loose compared to the rest. But otherwise I don't see any evidence of a bad gasket anywhere. Sort of stumped at this point.
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post #9 of 11 (permalink) Old 02-19-2018, 01:03 PM Thread Starter
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Some additional pics. Zero oil below the valve cover gasket from running my finger along the top edge below where the gasket would be. I am so baffled.
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post #10 of 11 (permalink) Old 05-20-2019, 02:40 AM
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Hello,

I know that this is an old topic, but I have the same issue on my 2015 STR. I have even replace the valve cover gasket, but no luck; oil still appears in the mentioned area. How did you solve your issue? I hope you can help me get a clue.

Thank you
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