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Old 02-08-2017, 02:52   #1
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Black smoke on yanmar diesel

I have black smoke coming out of my yanmar 2gm20, to the story its to be said that the engine were not started for 15 months.

What I have done so far is:
  1. Changed oil and oil filter
  2. All diesel hoses and filters
  3. All water hoses are new
  4. Removed exhaust pipe and looked into the engine seems ok
  5. New antifouling, sinc anodes, saildrive gear oil change
  6. Renewed starter and alternator
  7. Changed vbelts
  8. Changed the bleed pump
  9. Tested opening pressure of injectors to ca. 145 bar open at the same time
  10. Run the injector pump without injectors attached, seems ok
  11. Adjusted valve clearance
  12. Removed air filter, waiting for new one

So what should I do next? It seems to not be running on maximum rpm and also have problems running on idle in gear. My RPM does not work, seems to be the tachsensor(took it out no change in resistance when holding a spanner close to it) but I can not find a new sensor, any ideas where to get one? So I can unfortunately tell the RPM speeds.

  1. So could it be the governor?
  2. How to check this?
  3. Should I lift the top off and check pistons?
  4. Should I do a compression test?
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Old 02-08-2017, 02:59   #2
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Re: Black smoke on yanmar diesel

Compression test would tell you a lot. Black smoke is often oil being burned. Maybe valves are out of whack or piston rings.
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Old 02-08-2017, 03:20   #3
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Re: Black smoke on yanmar diesel

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Originally Posted by hobopacket View Post
Maybe valves are out of whack
How to test and change this?
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Old 02-08-2017, 04:13   #4
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Re: Black smoke on yanmar diesel

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How to test and change this?
Like he said. Compression test for a start.
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Old 02-08-2017, 05:00   #5
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Re: Black smoke on yanmar diesel

Greetings and welcome aboard the CF, skatun.
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Old 02-08-2017, 05:34   #6
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Re: Black smoke on yanmar diesel

A compression test will narrow it down to either of those two things. If compression is low. Time to start tearing off the head and see what you find.
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Old 02-08-2017, 05:43   #7
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Re: Black smoke on yanmar diesel

i had the same engine ran fine with no load than smoke ,oil ,fuel lays on the water
pulled head,# 1 piston wasn't coming to the top, bent connecting rod, engine out yesterday in stt,

before pulling head

new exhaust manifold, mixing elbow
rebuilt injectors, and pump
new fuel pump

3gm30
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Old 02-08-2017, 05:54   #8
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Re: Black smoke on yanmar diesel

Is it smoking at all speeds or only when above 2500 rpm? That is a dirty bottom/running gear, not a bad engine.
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Old 02-08-2017, 06:41   #9
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Re: Black smoke on yanmar diesel

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Is it smoking at all speeds or only when above 2500 rpm? That is a dirty bottom/running gear, not a bad engine.
Well i do not have an rpm measurement(broken see first topic) so its hard to say exact what RPM smoke start at, bottom/gear were done less than a month ago, so its all super smooth..
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Old 02-08-2017, 06:42   #10
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Re: Black smoke on yanmar diesel

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Originally Posted by hobopacket View Post
A compression test will narrow it down to either of those two things. If compression is low. Time to start tearing off the head and see what you find.
What should the compression pressure be?
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Old 02-08-2017, 06:53   #11
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Re: Black smoke on yanmar diesel

The valve clearence should be 0.2mm right? In the maintaince manual it say that black smoke means wrong valve clearance.
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Old 02-08-2017, 08:13   #12
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Re: Black smoke on yanmar diesel

Check prop if in the water.
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Old 02-08-2017, 08:17   #13
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Re: Black smoke on yanmar diesel

I think what you need is a mechanic! Remember where you might be when it breaks down! It takes a lot longer to get your tow than on land! Might also check your tow insurance make sure it's adequate and current!
Recently towed! Without insurance it would have cost over 3 thousand dollars!
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Old 02-08-2017, 08:25   #14
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Re: Black smoke on yanmar diesel

Black smoke in heavy truck diesels often indicates bad injectors. You checking the injector cracking pressure was a good move, but the spray pattern may be bad and of too much volume (too rich causing the black smoke which is mostly unburnt fuel) because the valve seat or stem head is worn out and the metering is off. Cracking pressure should only indicate that the injector spring is still within spec and the seat is still good enough to seal properly when fuel pressure is below the cracking (valve opening) pressure. It doesn't necessarily say anything about correct fuel metering.
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Old 02-08-2017, 08:31   #15
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Re: Black smoke on yanmar diesel

What Lester says
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