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Detroit diesel help!!!!!

Old 02-18-2019, 02:30 PM
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Default Detroit diesel help!!!!!

I have a 40' Viking sport fish with twin Detroit diesel turbo 671s. I started up the boat today it is in storage in the water, It has been and is once again winterized properly I actually had a charter that's the reason for starting the boat in the winter, on my port motor I noticed white milky clumps of oil about the size of a bb that broke down into a giant oil slick. I then realized the port transmission was not responding no forward or reverse. The transmission was out of fluid, after filling the transmission and restarting the engine the same milky dots of oil came out until the transmission was once again empty. What could this be what do I need to replace or check? Also I had the oil contained with floating oil absorbers just so everyone knows. The engine oil and coolant are both perfect its only the transmission loosing oil out of the exhaust, what could this be?
Old 02-18-2019, 02:39 PM
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Default Oil cooler exchanger maybe cracked from freezing

Cracked oil exchanger for gear box i am guessing
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Old 02-18-2019, 02:42 PM
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Thank you very much! thats what im thinking too I just wanted some feed back or other ideas before I order one just incase im missing something
Old 02-18-2019, 02:45 PM
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Originally Posted by CaptainRich5053 View Post
Thank you very much! thats what im thinking too I just wanted some feed back or other ideas before I order one just incase im missing something
Most likely the gear cooler. Easy to pull off and test, usually sits right on top of the gear, two big hoses for cooling (one goes to exhaust elbow) and two smaller 3/4" oil lines to gear. Sendure makes very good replacements when you confirm and get sizes for fittings (change both sides!).
Old 02-18-2019, 02:47 PM
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Gear oil cooler
gear was run without oil, now or when it was put away. You will be lucky if it is still ok
SenDur makes that cooler. They are in Ft Lauderdale Fl. Easy cooler to remove. Hose clamp on either end, two compression fittings for oil lines and 4 bolts hold it down
measure the dimensions, size of the NPT oil lines (think they are 3/4) and the od of the water inlet / outlet ( think 1 1/2)
Install the new cooler, fill the gear with oil and hope keep your fingers crossed

​​​​​​​good luck
Old 02-18-2019, 03:02 PM
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Swap out the other side as well
Old 02-18-2019, 03:36 PM
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lenco heat exchangers.com stocks all Detroit diesel transmission coolers. You have J&T 671 tib if the vking is 1980s.
631 842 4049
Old 02-18-2019, 04:40 PM
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Odds are the gears are shot. Probably had salt water sitting in there during the lay up. Cooler went bad. Fairly common unfortunately..
Old 02-19-2019, 04:24 PM
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May not have water in the gear.
Gear oil pressure is much higher than raw water pressure, forces oil out when there is a leak in the cooler, so water usually does not enter the gear
BUT if gear was run without oil for any time, she may be toast
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Old 02-19-2019, 05:38 PM
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It doesn't look like any water was in the gear, I ran it for about 10 min with no oil in the gear until I figured what was going on I only placed it in forward and reverse quick maybe 3-4 times hopefully I didn't toast anything.
Old 02-19-2019, 06:02 PM
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I don't think you toasted the tranny that quick. replace the cooler and fill her up. contact www.mrcool.us
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Old 02-19-2019, 06:20 PM
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Mr cool is a great source. Usually shorter lead time then sen dure. Den dude does have very good customer service though.

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