Hole in exhaust manifold

[BenM]

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?

[Barnyard]

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

[Rick Spivey]

The water on the carb is condensation, very normal.

[BenM]

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?

[Glen]

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.

[BenM]

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?

[Glen]

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.

[staninlowerAL]

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.

[Urbish]

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