black gooey stuff

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john2189
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black gooey stuff

Postby john2189 » Wed Dec 07, 2016 8:53 am

is coming out of the underslung muffler of my 72. Is my motor worn out or valves need reseated, something else? It does use about 1/2 qt of oil in about 6 hrs of running time at full throttle mowing,I do not notice any blue smoke. it has some small leaks too.. Ive had it for 11 years and I dont notice any power loss. if it needs rebuilt now is the time during winter to do it. any other things it could be?

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Don McCombs
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Re: black gooey stuff

Postby Don McCombs » Wed Dec 07, 2016 9:42 am

Condensation in the exhaust system dissolving the built up carbon. If it dries, it's carbon. If not, it's oil.
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Re: black gooey stuff

Postby Shane Nelson » Wed Dec 07, 2016 11:54 am

1/2 a quart in 6 hours isn't good. How bad are the leaks?
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Re: black gooey stuff

Postby john2189 » Wed Dec 07, 2016 1:41 pm

Chipmaker wrote:1/2 a quart in 6 hours isn't good. How bad are the leaks?


Not that bad,but if the rings were worn out, wouldnt it burn the oil instead of passing thro the exhaust? Could it be worn valve guides?
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Re: black gooey stuff

Postby Shane Nelson » Wed Dec 07, 2016 1:51 pm

john2189 wrote:
Chipmaker wrote:1/2 a quart in 6 hours isn't good. How bad are the leaks?


Not that bad,but if the rings were worn out, wouldnt it burn the oil instead of passing thro the exhaust? Could it be worn valve guides?


Yes, if the rings/cylinders were worn bad enough it would burn it and you would have spark plugs fouling and smoke out the exhaust. It very well could be valve guides. Have you pulled any plugs and inspected them? Are you seeing any white smoke? Oil smoke can also be white, trust me, my Sonoma looks like a cloud just left the exhaust if I drive it and it sits for 8 hours+, it needs valve seals.
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Re: black gooey stuff

Postby john2189 » Wed Dec 07, 2016 2:02 pm

Chipmaker wrote:
john2189 wrote:
Chipmaker wrote:1/2 a quart in 6 hours isn't good. How bad are the leaks?


Not that bad,but if the rings were worn out, wouldnt it burn the oil instead of passing thro the exhaust? Could it be worn valve guides?


Yes, if the rings/cylinders were worn bad enough it would burn it and you would have spark plugs fouling and smoke out the exhaust. It very well could be valve guides. Have you pulled any plugs and inspected them? Are you seeing any white smoke? Oil smoke can also be white, trust me, my Sonoma looks like a cloud just left the exhaust if I drive it and it sits for 8 hours+, it needs valve seals.


No I havnt checked plugs yet. There is no noticeable smoking. I will remove the dipstick to see if there is any blowby next time i get a chance. It still runs really good and no loss of power.
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Re: black gooey stuff

Postby Shane Nelson » Wed Dec 07, 2016 2:05 pm

john2189 wrote:
Chipmaker wrote:
john2189 wrote:
Not that bad,but if the rings were worn out, wouldnt it burn the oil instead of passing thro the exhaust? Could it be worn valve guides?


Yes, if the rings/cylinders were worn bad enough it would burn it and you would have spark plugs fouling and smoke out the exhaust. It very well could be valve guides. Have you pulled any plugs and inspected them? Are you seeing any white smoke? Oil smoke can also be white, trust me, my Sonoma looks like a cloud just left the exhaust if I drive it and it sits for 8 hours+, it needs valve seals.


No I havnt checked plugs yet. There is no noticeable smoking. I will remove the dipstick to see if there is any blowby next time i get a chance. It still runs really good and no loss of power.

Okay, check your plugs too. That will give you some direction to go if the plugs are clean. You can tell a lot by the color or carbon build up on plugs if they been in a while. If you search on Bing "how to read a spark plug" all kinds of charts will come up as to how to read what's on them.
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Re: black gooey stuff

Postby ScottyD'sdad » Wed Dec 07, 2016 3:09 pm

Cubs don't have overhead valves, so oil leakage by the valve guides isn't an issue. They don't have valve seals, like OHV engines do.
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Re: black gooey stuff

Postby Shane Nelson » Thu Dec 08, 2016 7:17 am

ScottyD'sdad wrote:Cubs don't have overhead valves, so oil leakage by the valve guides isn't an issue. They don't have valve seals, like OHV engines do.
Ed

If oil isn't getting past the valve guides (which it would be hard to do without overhead valves) it has to be going by the piston/rings and there will be evidence on the spark plugs. I know they don't have valve seals, just got done rebuilding one. I made that reference to my truck, I know it needs valve seals in it.
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Re: black gooey stuff

Postby Matt Kirsch » Fri Dec 09, 2016 2:35 pm

Yup, and consuming 1/2 quart in 6 hours, it should be smoking like a fiend if that is the problem.

Odds are better that you have a bad leak somewhere, front or rear seal would be my first suspicions.

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Re: black gooey stuff

Postby john2189 » Fri Dec 09, 2016 4:16 pm

oil leaks is about the size of a quarter when it sits for a week, so maybe it smokes more than I think it does
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