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Old 11-18-2019, 10:36 AM   #39
Veteran Member
City: North Jersey & Plattsburgh NY
Country: United States
Vessel Name: TBD
Vessel Model: TBD
Join Date: Nov 2019
Posts: 34
My $0.02

If you are worried about thick oil use synthetic oil and problem is solved. But how thick can the oil be if the boat is not ice bound?

If you want better start or less smoke heat the combustion chamber in the block where the combustion happens. The combustion chamber is the part of the block surrounded by coolant and the part that will be warmed by heating the coolant. The oil pan is a long way away from the combustion chamber. Heating the oil laying in the bottom of the oil pan will take a long time to spread any heat to the combustion chamber in the top of the engine.

If the engine has freeze plugs that you can replace with coolant heaters the installation would be so clean, simple and effective it is a no brainer to go that route. Otherwise a tank heater will work but add a lot of clutter to the engine room.

If the engine starts hard or smokes at temperatures where the water is not frozen perhaps the engine needs work. Leaky diesel injectors will cause smoke as the fuel that leaked into the combustion chamber burns off. Low compression or slow cranking speed will cause hard starting.

Failed thermostats will cause the engine to warm up slower. But remember compared to gas engines diesel engines produce less waste heat, especially at idle. A diesel engine will never warm up as fast as the engine in your gasoline car. Less waste is why we love them.

As someone said above the best way to warm up a diesel engine is to get underway.
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