is more stable than gasoline with ethanol, but it still absorbs water
, and water will do serious damage to injectors. It’s a good [tho’ not eveyrone agrees] idea to fill the tanks
, on a diesel-powered boat
, before hauling out. With full tanks
, there’s less internal air space and less tank surface to collect condensation
Add a dose of biocide/ stabilizer to the tanks to prevent algae growth before you top them off. Running the engine out of fuel
isn’t necessary with a diesel engine, and it’s difficult to purge the air out of some diesel engines to get them running in the spring.
I used Biobor JF and Star Tron Diesel Additive.
Spray some oil
into the inlet manifold. Then crank the engine over a few times (without starting it) to coat the cylinder walls with oil
Seal all of the openings that go into the engine to prevent the damp air from getting inside. Make caps out of plastic containers and tape to cover the air inlet, transmission
and crankcase breathers and exhaust outlets. Leave a note for yourself listing all the openings you have sealed, so you’ll remember to uncap them in the spring.
“How do I care for my unused engine?”
~ Power & Motoryacht
“Normally, a diesel can remain unused for around two months without much attention. Since yours may be laid up longer, you should protect the fuel and cooling
systems and internal and exterior parts
and rusting. (I assume that the boat is at a dock
with shorepower to keep the batteries
charged.) Rather than have someone idle the engines, I suggest you do the following: If you’re close to your oil and filter change interval, have it done so you’ll have fresh lube in the engine during layup
. Whether you change oil or not [you should], before you lay up the boat, take her out for an hour so you et the oil up to operating temperature. This will evaporate any moisture in it* and help clean the inside of the engine. Top up the coolant
. Check for coolant
, fuel, and oil leaks
. Fix any you find, then tighten all hose clamps ...”
* Should be kept below 50% RH, inside engine.