Looking for help troubleshooting my old raw-water cooled Yanmar 2GM
. Here are the symptoms and circumstances so far:
- sailed to offshore
island with a friend. Just outside of harbor went to start engine
and starter burnt out in a puff of smoke.
- with zero wind
could not sail into harbour. With prevailing current
onshore needed to get engine
- flipped up decompression levers, attempted to start by hand cranking, in my haste *forgot to close raw water
- after several valiant attempts to hand crank, no skin left on knuckles, and rocks approaching, dropped anchor
to await a tow.
- no starter parts
available on island. Dissasembled starter, cleaned brushes
to no avail, starter was dead.
- after two days couldn't wait any longer, rowed her out of harbour with the dinghy
, sailed home.
- various obligations kept me busy through the ensuing winter. It was 8 months later when I finally installed a new starter and tried to start her again. During that time she sat as she was.
- after installing new starter she wouldn't crank at all. Tried with hand crank and found she was seized.
- checked oil
and found crankcase overfull. Oil
flowed out of crankcase when dipstick removed.
- tapped on hand crank with large hammer. After a few taps she started to free up. Continued tapping through one revolution untiil she freed up enough to turn over normally.
- removed oil fill cap on rocker cover to observe rocker movement. Rockers moving as expected.
- tried starter, she cranked over fine.
- checked turning by hand crank with and without decompression levers up. Compression
- bled fuel
system completely. Certain no air in fuel
- tried starting. Would not fire at all.
- pumped out oil and replaced several times with fresh until system clean.
- stored oil in glass bottles. After sitting oil separated to top revealing mayonnaise like substance in bottom centimeter of jars.
- pumped out fuel tank
and lines of all fuel, replaced with fresh diesel
, rebled system.
- tried starting several times, will not fire at all. Not one pop.
- Hand cranking with raw water
intake open allowed water
to enter cylinders.
- After sitting for 8 months water
seeped down past rings and gathered in crankcase.
- Resulting corrosion
resulted in at least one seized piston.
- Top end corrosion
resulting in improper injector and/or valve operation leading to lack of combustion.
Based on the above circumstances and symptoms does this hypothesis sound accurate? What are the next steps to diagnose? I plan to remove head
and thoroughly inspect and clean, then re-install with new head gasket
. What should I watch out for? Boat
is on a mooring
, very far from the nearest mechanic
, and I'm operating on a tight budget
Appreciate any help!