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Old 03-30-2015, 06:27 PM   #1
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Oil Drip

Hello All, noticed about an eye dropper worth of oil in my clean drip pan yesterday. I haven't tracked the location of the source, had guests on board so I'll need to go back and spend time down there and see if I can track it down. I just changed my air breathers, and fuel/water separators. Doubt that has anything to do with it.

I'm wondering if any amount of oil drip should be expected on my old engines? They have about 1200 hours on them.
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Old 03-30-2015, 07:12 PM   #2
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If you have a Ford Lehman 135 I can give you clues on where to look for a leak.
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Old 03-30-2015, 07:16 PM   #3
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Looking at my post on my phone I see that signatures don't show. That's where I have my boat and engine spec listed. I have twin Volvo tmd41a engines. '1987
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Old 03-30-2015, 07:48 PM   #4
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My Nova 36 has Volvo TMD40s and the starboard engine has developed a leak ( only when the engine is runnin')under the timing gear case. It is so slow a leak, I'm not all that worried about it.
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Old 03-30-2015, 08:06 PM   #5
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My Volvo has only 500 hours but it is 12 years old. It developed a leak at the oil pressure sensor--nothing major but it was fixed. I originally thought the leak was coming from the timing case. I also replaced the oil pan gasket last year (whole engine came out).
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Old 03-30-2015, 11:35 PM   #6
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thanks all! now i'm not so worried and have a couple specific places to look.
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Old 08-18-2018, 01:17 PM   #7
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I have twin ford Lehman 120 I have a oil leak now on both engine at the rear I read on your forum that it could be from a freeze plug on the end of the cam shaft, at first I thought it might be a rear seal. Does anyone know any thing about this I would like to get more information for my mechanic. Thank you Bill
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Old 08-18-2018, 01:37 PM   #8
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Quote:
Originally Posted by Yakobi51 View Post
I have twin ford Lehman 120 I have a oil leak now on both engine at the rear I read on your forum that it could be from a freeze plug on the end of the cam shaft, at first I thought it might be a rear seal. Does anyone know any thing about this I would like to get more information for my mechanic. Thank you Bill
There are several possible leak locations that could end up dripping at the rear of the engine. The two most common are the valve cover and the breather valve at the top of the valve cover. I would say a careful cleaning of the top and rear of the engine then a careful examination after each run will help pinpoint the location(s).

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Old 08-18-2018, 02:46 PM   #9
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Brian at ADC said the rear seal normally doesn’t leak, it’s the freeze plug on the cam.
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Old 08-18-2018, 06:16 PM   #10
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https://www.amazon.com/Mastercool-53.../dp/B000IHJXHG


You can get them substantially cheaper...
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