We have a 1985 Yanmar 3GM30
with 2200 hours on it.
In April 2010, I just changed the oil
, transmission oil
, oil filter
, secondary fuel filter
, zinc, and water
(not the water
is raw water
After all of this maintenance
we took the boat out for a trip and used the engine
for about 2 hours. There was no problem.
Then this weekend all hell broke out.
When we started the engine up, we saw water coming out of the exhaust
so everything seemed fine. We motored out of our marina and up the river. After about 15 minutes an engine alarm
went off at the starter panel, I flipped the RPM
switch and the alarm
turned off but the RPM
needle stopped reading also. I figured it just shorted or something. About 5 minutes later the engine turned off.
We wern't sure why it stalled but, it has stalled before so we just started it back up and after a few trys it came on. This only lasted about 1 minute then the engine turned off again. So we said owell and put the sails
up and sailed up the river.
A couple minutes later we noticed a light smoke coming from the cabin
. Fire extinguisher in hand I opened up the engine compartment and there was alot of smog/smoke coming off the engine. We opened up the cockpit
engine access too to let smoke out but there was no fire.
At this point we realized that the engine has overheated.
We sail for another 45 minutes untill we lose wind
and without the wind
power we accidently run aground. The smoke had all cleared and the engine wasnt as hot so we attempted to use the engine to get us off the ground. The engine came right on and we used it for about 5 minutes before giving up and turning off the engine.
We called Boat US Towing and they pull us off the ground. At this point we should have let them tow us home boat we thought the enigne wasnt so bad since it came on and worked fine after cooling
off so we just had him let us go and we sailed to a near by anchorage. When we got the anchorage we turned the engine on for about 2 minutes to get in a good location, at this point we noticed that no water was coming out of the back exhaust
. I went below and saw a slight leak at the hose between the water filter and water pump. I tightened that hose as well as all the other hoses related to the cooling
system. We tried the engine again and still no water came out the back so we truned it off and left it off for the night.
The next morning we opted not to use the engine and sailed off the anchor
and out of the anchorage. But as we were leaving the wind was not strong enough and the current
threatened to put us aground again. So as a last ditch effort we turned on the engine to attempt to get us away from the shoal. But instead the engine stalled in forward gear
, and would not return to neutral or reverse. We abandon the engine option and manage to dodge the shoal via sail.
On the sail back home, I went down to the backside of the engine compartment to check out why the gear
would not leave forward. It was just stuck and only moved slightly back and forth but not enough to enter neutral or reverse.
Also while I was on the back side I noticed that the plastic container between the exhaust manifold/elbow and the exhaust pipe where the exhaust and water meet has partially melted and there was a large hole in the side of it. There was also oil sprayed around this area of the engine compartment.
We had Boat US Towing put us back in our slip and now we have some repairs
on our hands.
My plan is to focus on the cooling system and transmission
. I will change the water impellor, check/replace all tubing, and ofcourse replace that plastic mixing container. On the transmission side I will consult a Diesel mechanic
friend of mine said that I probably ruined the whole internal engine and will need to have a complete rehual or buy a new engine.
So my question is, do you think this engine is ruined and what advice can you give me on repairs
Attached is a crude picture.
Thank you in advance to the knowledgable people of CF.