Yanmar 3GM30F Restart

[rognvald]

It's been a while since I've spent some time on CF and hello, again, to all. A year and a half ago, I hauled my boat for dry storage for medical reasons. When I decommissioned the engine, the oil had been recently changed(20 hours), it was flushed with fresh water and then RV antifreeze run through the raw water cooling system and shut down. The wet exhaust was plugged with an oily rag and taped. The intake was lightly sprayed with fogging oil. The engine compartment panel was left open for airing.
Are there any precautions I should take before restarting the engine on the hard? What do you think would be the safest way. Thanks in advance . . .
Rognvald

[JimsCAL]

Sounds like you put it to bed properly. Only things I see missing that I would do is change the oil and filter despite the low time, and change the fuel filter(s). Bleed the fuel system, charge the batteries, and go for it.

[bil56]

spray some wd40 at the inlet of the air filter,
close the water inlet valve if it has a little trouble starting,
start normally but choke the engine to increase oil pressure.
re-open the water valve,
run a few minutes and check all the engine

./.

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this is just my opinion, but I share it...

[JimsCAL]

One additional suggestion. Engage the cylinder decompression levers on the top of the engine and roll it over by hand. Will make sure everything is free and moving smoothly.

[rognvald]

If there aren't any other replies(?), thanks to our members who have responded to my post. I'm not expecting any issues but there's a guy named Murphy . . . well, you know the rest.
Rognvald

[NYSail]

Sounds like you did everything correctly closing it up. Good advise above but Personally I would check the oil then turn the engine with the decompression lever pulled to spread the oil, then go ahead and start her…… obviously make sure a hose is leading to a pail with adequate water supply.

Good luck
Greg

[Jammer]

Visual check for mouse nests, bird's nests, missing parts then go for it.


Watch closely for oil and fuel leaks on initial startup and for the first few minutes.


No need to change the oil before running unless it's contaminated.


If you have spin-on oil or fuel filters, inspect them and if the can is rusted replace it. They can corrode while sitting and that weakens them which can lead to bursting later.

[chris mac]

Double check your belts for cracking, and turn the pulleys by hand to make sure water pump and alternator havent seized

[DoubleD]

Originally Posted by bil56

spray some wd40 at the inlet of the air filter,
close the water inlet valve if it has a little trouble starting,
start normally but choke the engine to increase oil pressure.
re-open the water valve,
run a few minutes and check all the engine

./.

--------------------
this is just my opinion, but I share it...

Does a Yanmar 3GM30F have a choke? Or is there a technique for this I'm missing?


thanks,
DD

[boatpoker]

Originally Posted by DoubleD

Does a Yanmar 3GM30F have a choke? Or is there a technique for this I'm missing?


thanks,
DD

Diesel engines have no choke and be very, very careful about spraying anything into the intake.

[gonesail]

Originally Posted by JimsCAL

One additional suggestion. Engage the cylinder decompression levers on the top of the engine and roll it over by hand. Will make sure everything is free and moving smoothly.

good idea. or just spin it over with the starter.

[skipperpete]

Originally Posted by DoubleD

Does a Yanmar 3GM30F have a choke? Or is there a technique for this I'm missing?


thanks,
DD

He used the word as a verb, not a noun and he described the way mechanics get engines to spin faster and not start to bring up oil pressure by covering the air intake or the carburettor throat on a petrol engine. Totally not needed on a yanmar GM with decomp.
My common rail diesel 4wd has an intake butterfly and for a long time most automotive diesels used a manifold choke to generate brake vacuum.

[Lemsteraak]

Why do you want to start it up on the hard? You have done a good job pickling it, just leave it that way until you are in the water.

You don't say how old your 3GM30F is? Some can be quite old, like mine, and you have a few more things to check and change.

I think the most important thing to do is to spin the engine up to get oil pressure before starting. Close the water intake and if you have any questions on the impeller, take it out, you don't want to run it dry. Open up the decompression levers on top of the head. Pull the stop lever to shut off the fuel. Push the start button and spin the engine for ten seconds or so. Not too long, let the starter motor cool. When the oil pressure light goes out, or the alarm stops, you engine is up to pressure. Put your impeller back in, turn on raw water, release the decompression levers and push the stop lever back in and you are set to fire it up.

I would do a visual before you start up an engine that has been stored for a long time. Run through the normal maintenance schedules because of age, not hours run.