I am guessing here, but is this hole near the water pump? On my Atomic 4 the water pump drive has a water seal and an oil seal and a hole in the middle. If it leaks water the pump end seal is leaking and if it leaks oil the engine end seal is leaking.
Joe Della Barba Coquina C&C 35 MK I From: Todd Williams via CnC-List <[email protected]> Sent: Tuesday, June 9, 2026 9:43 AM To: Stus-List <[email protected]> Cc: Todd Williams <[email protected]> Subject: [EXTERNAL] Stus-List Oil Leak - Universal Diesel 5416 Indigo Out We Go (1980 C&C 34) went in the water on Wednesday! We motored three hours to our mooring and as we were leaving the boat I noticed an oily streak on the outside of the hull at the bilge output. I went back yesterday to investigate and found the bilge full of oil. Dipstick reads low so I added a quart of oil to identify the details of the leak. Oil is pouring out of a manufactured hole in the engine block (see video) in the front right part of the engine below the raw water pump and left (when viewed from the salon) of the front motor mount. Of course, very difficult to access. I don’t see a plug lying loose in the bilge nearby. https://drive.google.com/drive/folders/1kovA-y1sGBB22IaUBoVRDabmfSAiWcTL It is a manufactured hole but it is not described in the Westerbeke parts manual (picture in folder). It is near part 3 (plug) but there are two holes in that area and the one that I have leaking is different. It does not look threaded. I can stick a wire up it about 2”. As anyone experienced this leak? What was your solution? Is there a knowledgeable professional source on Universal / Westerbeke diesel engines from 46 years ago? Thanks, Todd Saco, ME
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