Oil leak

[Subfixer]

I checked both those areas, as well as others, very carefully. All dry. I could see evidence of oil on the bottom of the header flange for cylinders 2 and 4. Top of the header flange is dry. With a good light, I can see where the oil sheen starts. I thought maybe the timing chain tensioner cover, but that was dry also. Only leaks when engine is running. May also explain why I need to add coolant every few hundred miles.
The engine is a Haibeck 415.

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[secondchance]

Originally Posted by A26B

That would be unusual for sure.
There are two sources of leaks in that area, which are common.

1. Oil Pressure Switch. See the left side of the following photo. Remove the wiring connector & look for oil in the connector. If there is oil, replace the switch.


2. Oil Pump Access Cover (difficult to access)
Photo showing the cover. Located at the very front of the Right side of the Lower Crankcase.
Frequently due to loose bolts,w which can be tightened to stem the leak. If no love from that procedure, remove & replace the gasket.

I agree with Jerry?s opinion. Mine turned out to be the pressure switch.

[A26B]

Originally Posted by Subfixer

I checked both those areas, as well as others, very carefully. All dry. I could see evidence of oil on the bottom of the header flange for cylinders 2 and 4. Top of the header flange is dry. With a good light, I can see where the oil sheen starts. I thought maybe the timing chain tensioner cover, but that was dry also. Only leaks when engine is running. May also explain why I need to add coolant every few hundred miles.
The engine is a Haibeck 415.

Sent from my Pixel 4a (5G) using ZR-1 Net Registry mobile app

That could be. I was going under the premise you were working on a stock engine. The more information, the better the diagnosis.