Hi David,
you are lucky, insomuch as these yanmar engines are very durable.
An attempt to start this cold engine if it is hydro'd is unlikely to
bend a con rod. Being compression start it must have a couple of
compression cycles to develop enough heat to fire the first cylinder.
No glow plugs is simple and a benefit in this case.
Item 1) = good news
Item 2) don't fret about the time to get back. It's something you
have no control over. As I said, these engines are durable and the
internals are coated with oil... that's good. right?
I suggest the following:
* drain the oil & replace with a few litres of cheap stuff (you
don't need a bunch a additives for this stage)
* close raw water inlet
* operate the decompression level and bar the engine over by hand
* if you don't feel any "humps" after a while the okay to proceed
to bar engine using decompression & starter (45 second intervals & 1
minutes rest, max 10 times)
* wait 15 minutes and repeat with application of WD 40 spray into
intake (WD 40 is light and has fish oil, better than PB Blaster for this)
* open raw water intake
* start engine normally using decompression
* warm up in gear to normal operating temperature (30 minutes or
more @ 2000 RPM)
* shutdown, wait 15 minutes and drain oil
* change oil filter & refill with preferred oil
At 01:01 PM 21/10/2015, you wrote:
Well this is a crappy way to end the season. Short story is, I'm
99% positive that I managed to get water in the cylinders in my
Yanmar 3GM30F, and now have a hydrolock. Thankfully, the engine was
not running when it happened, but I *did* attempt to crank the motor
with the starter a couple of times before I realized what had
happened. So now, I'm worried about significant damage from two angles:
1) Bent rods/crank/pistons? I'm inclined to think that the starter
motor doesn't have nearly as much torque as the engine operating
under normal load, so I'm hoping that my attempts to crank didn't
permanently do any damage such as this. Thoughts?
2) Time: Unfortunately I can't get back there with tools and
equipment to attempt to rectify the hydrolock until Sunday, which
means the engine will have been sitting there with water in the
cylinders for almost 4 days. It's mostly fresh / brackish
water (boat's on a mooring in a river mouth). Chances of corrosion
in the cylinders requiring a teardown?
Anyone have any experiences with hydrolocks they'd care to share?
Ugh...
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