I have a question for you in regards to the Yanmar
4JH4E. I had a problem with the engine
when I came out of Cabo San Lucas the other day. It started smoking (white) a few minutes after I left the fuel dock
. I shut the engine
down and began sailing. I anchored the boat and looked at the fuel filter
and there were some large particles of gunk in them. I had to take apart the racor
200 in order to clean them. I did not have a new O ring to replace the ring in the filter housing so I used the original. The old O ring failed and that is why the engine died. It was a major air leak. I changed to my alternate Racor
and the opposite fuel tank
and everything worked fine for about 6 hours. Then the engine began racing
and the white smoke came out again. I changed back to the first racor and the engine died. I used the dink to limp into dock
. From there I removed all the fuel
from the tanks
, put it in Jerri cans, ran it thru a Baja
filter and then returned it to the tanks
. There was nothing particularly dirty about the fuel and the baja
filter did not have any water
in it when we were done.
The next day we ran the engine slowly under 2000 rpms. When we brought it up to the cruisng speed (2200 rpms) it started spitting out smoke. We dropped it down to 1200 rpms and the smoke decreased then was completely gone. We brought it up to 2000 rpms and there was no smoke when we brought above 2000 the engine would race
and then it would smoke.
I pulled about a quart of oil out thru the dipstick and then we could go up to 2100 but not above or the engine would smoke.
In reading the manual I studied it and found out that I have been putting too much oil in. I have been putting in 5.5 ltrs and when an engine is set at a rake (as mine is) it should be 5.0 ltrs. When I arrived in La Paz
I went to change the oil and I extracted almost 8 quarts of oil. The oil smelled different but still had reasonable viscosity. Now I know that I didn't put in 8 quarts of oil so I am trying to figure out how come there was so much oil in the crankcase. These are my theories:
1) possible water
in the crankcase -- the oil was not milky and had a reasonable viscosity so I doubt this)
2) Perhaps the suction device that I have been using has not been extracting all the oil from the crankcase and the too much oil problem has compounded over the 3 or 4 oil changes that I have done. -- A possibility but on my last oil change
I had to remove some oil after I had changed the oil b/c I had added too much. The oil that came out was dark for a little while then I got to the clean oil. It was filled to the top line of the dipstick.
3) Somehow diesel
is getting into the oil. I read on CF that this has happened to someone with a Yanmar 3GM
by leaking thru the injection pump and was wondering if it could happen on a 4JH.
Do you have any other ideas? The boat is in Mexico
and I wanted to bring an oil sample home to have it tested but I was afraid the airlines wouldn't let me bring the oil on the flight so I didn't do it.
I changed the oil and added back only 1 gallon of oil and the dipstick read that the oil was over full. I ran the engine for a few minutes while moving among the docks for maybe five minutes and when I read the dipstick again it still read over full at the same level as before I ran the engine.
I plan on bringing the boat back to the US in the spring or the summer. Parts
for Yanmars are difficult to get in Mexico
although I am told there are some real good mechanics.
so if this is something that I need to take care of right away -- and I imagine it is -- I would need to bring parts
with me from the US and then go to Mexico.
A friend is borrowing the boat right now and I have asked him to check the oil everyday a couple of times and if the viscosity gets thin to remove some oil and add fresh full oil and then to motor
as little as possible.
Do you have any ideas?