Hole in exhaust manifold

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BenM
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Hole in exhaust manifold

Postby BenM » Thu Apr 27, 2017 2:35 pm

I thought I found an oil leak today but when I looked I found a small hole in the exhaust manifold. Its hard to see but in the picture below there's a black part of the manifold, its in the center of that. It looks uniform, like it was drilled but I looked at a manifold on TM and didn't see a hole on theirs. There is a oil mist coming out of it turning everything below it black, eventually dripping off onto the ground.. Also the carb has water coming down on it from somewhere, maybe the same issue? Its dry when I start it and then water appears in between the two gaskets pooling up on the lower gasket.

Is it time to replace the exhaust manifold?

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Barnyard
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Re: Hole in exhaust manifold

Postby Barnyard » Thu Apr 27, 2017 2:40 pm

That is designed that way to allow condensation to drain out the manifold.

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Rick Spivey
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Re: Hole in exhaust manifold

Postby Rick Spivey » Thu Apr 27, 2017 4:48 pm

The water on the carb is condensation, very normal.
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BenM
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Re: Hole in exhaust manifold

Postby BenM » Thu Apr 27, 2017 6:24 pm

Any idea where the oil is coming from? Is it related to the blow-by I am seeing or did I over fill the air filter bowl or something?

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Re: Hole in exhaust manifold

Postby Glen » Thu Apr 27, 2017 6:40 pm

Hi,
If there is oil spraying, or dripping out the little hole, it is probably getting by the piston rings.
I would use an oil additive and see if the rings free up, if they are stuck. It usually takes time for it to work.
I'm not sure if you have tested the engine compression, not sure if you have had the hood off, it can be done with the hood on, I have done it that way. :)

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Re: Hole in exhaust manifold

Postby BenM » Thu Apr 27, 2017 8:39 pm

Hood is on currently but not that big a deal since I don't have any screws in it at the moment. Whats the process for checking the compression?

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Glen
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Re: Hole in exhaust manifold

Postby Glen » Thu Apr 27, 2017 11:34 pm

Hi,
I don't know how much you know about checking compression. It is done by removing all the spark plugs and screwing the end of a hose on the test gauge into the holes, one at a time, then open the throttle fully, and run the starter, run the starter until the gauge stops going up, it only takes a few turns, then write down what the compression is. Then go on to the next cylinder, until you do all 4 cylinders.
Buy or rent a compression tester gauge at NAPA or somewhere, it has to fit the Cub's size of spark plug holes and threads. Modern cars use smaller size holes, so I don't know what you will find, I haven't bought one lately. You could take a spark plug along to show them the size. :)

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Re: Hole in exhaust manifold

Postby staninlowerAL » Fri Apr 28, 2017 6:53 am

BenM wrote:Whats the process for checking the compression?
Search function at the top of this page, for wet/dry compression test. You should find several posts on this subject. Also check the "HOW TO" forum engine section.

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Re: Hole in exhaust manifold

Postby Urbish » Fri Apr 28, 2017 7:32 am

Glen wrote:Hi,
Buy or rent a compression tester gauge at NAPA or somewhere, it has to fit the Cub's size of spark plug holes and threads. Modern cars use smaller size holes, so I don't know what you will find, I haven't bought one lately. You could take a spark plug along to show them the size. :)


I bought a cheap one from Harbor Freight and it has an end that fits the Cub spark plug holes (18mm). http://www.harborfreight.com/compression-test-kit-8-pc-62638.html


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