Yanmar 6lp ste issue

[socalmike]

AOG,

Please take a look at let me know what you think. 1000 hrs and maintained well. Smokes at start up and at idle. This is after a run offshore back in the slip. Seems to smoke more than it should. Runs great at all rpm just a bit smokey after warmed. Small sheen from time to time as well from exhaust.

Thanks in advance for the input. I have posted on boat diesel as well.

Mike

http://youtu.be/F-MfDP47J1U

[Jeremyvmd]

Looks like blue smoke on the video which would be oil burning. Might explain the sheen of you have oil residue in the pipes and it collects and drips...might need to be opened up and checked...

[socalmike]

Any idea on how this is happening. I do have a few drops of oil on the tranny from the breather tube on top of the air filter.

Thanks.

Mike

[Jeremyvmd]

I'd look at the usual culprits.
Worn rings, worn valves or seats, bad/thin/contaminated oil, etc.

I would check the oil. Looking for fuel in it, as well as just assessing its condition...beyond that your looking at cracking the motor. I could be very wrong, im sure someone will come along with a better answer.

[RobS]

Smoke does appear blue-ish. which means oil burning or the oil is diluted with diesel fuel..

What is oil situation - recently changed? proper level? using oil? making oil?

Do you have the 2nd dipstick like many 6LP's have? It would be near the starter. It's more accurate IMO.

Is the few drops of oil at the breather normal from your history with this engine or could you have excessive blowby?

Make sure the air cage foam element is clear.

Fuel filter history? Ever have water in the fuel? That could damage injectors?

Is your engine temperature staying up when you idle back in?

Have valve adjustments and aftercooler servicing been completed?

What's your max WOT rpm when you use the boat? And where do you normally cruise?

Make sure temperature is staying up at low speed running. I would change oil and be exact about having the right amount, keep it no higher than mid-dipstick and mark the dipstick. Take the on-engine fuel filter off and check it for any water. Change it and the Racor. Then use the boat and monitor the oil level and smoke.

[kerrye]

Is the air intake clear? Worn injectors can create smoke. I'd try rebuilt or new injectors before digging any deeper into the engine. A compression test would be a good diagnostic procedure. Typically worn rings would produce a fair amount of blowby which should be readily visible. If the engine starts easily it's not likely to be worn rings.

[socalmike]

Boat is new to us.

I had an oil analysis done upon purchase and came back perfect.

There seems to be a few drops from the air filter element dripping onto tranny below. Brand new filter and after first run a spot the size of a quarter on the filter and a few drops below on the transmission.

Oil needs to be changed. It has 100 hours on it.

Will replace racor and separator on the motor

Does not seem to be losing or making oil.

Thanks for the imput so far. Mike

[drbob]

"There seems to be a few drops from the air filter element dripping onto tranny below." Suggests blow-by commonly created by an oil overfill (or you took on some really big waves).

The smoke looks more white than blue to me, if that's the case, then you may have some really old fuel in the tank. Ours did when we first got it. Smoked terribly. Startron to the rescue. Pour a some Startron for diesel in the tank - double the recommended normal dose - they'll tell you to do that on the bottle. Can't put too much in. On our DeFever we carried 1,100 gallons and fueled once a year to keep it fresh while we were on the great loop. Cleared up our smoking issue. We're still treating it every time we add fuel and now it's almost completely gone.

You're also for your 1,000 hour engine work. Add a few things to the mechanic's list as recommended earlier.

Bob
2005 A28TE
Cape Coral, Florida

[socalmike]

Checked the oil an hour ago. Clean and not low but not full. Just in the middle on both dips sticks. Fuel tank and fuel are brand new. No traces oil diesel in the oil. I smelled just to make sure.

This is our first yanmar. I cam from the d series Volvo which gave off zero smoke.

Keep the replies coming.

Thanks.

Mike

[Tree]

Looking at the video I'm not concerned about the amount of smoke. We are at 1700 hours now and probably see about the same amount on start up, it does disappear I will add after a few minutes. Summer time with water temp around 18°C there is very little if any.

Coming from a D series, you've been spoilt. They were brought in after the successful KAD series of engines which were prone to smoking and as a result of engine emission regulations, were fazed out introducing the low smoke engine management controlled D series.

I know of these yanmars used commercially with over 12,000 hours on them. They are bullet proof so long as they are maintained.

One thing to be sure of, they don't like to idle. They are an engine to be used and if you need to run the engine while tied to the dock, be sure to put in in gear so it has some load on it.

[socalmike]

Thanks tree. I pulled an oil sample and it is black from use and needs to be changed. Is it possible it has lost viscosity and therefore smoking?

My neighbor has the same motors with almost no smoke after warmed.

Thanks.

[Tree]

Does he have the earlier 300bhp or the later 315bhp version.

The reason I ask is between us we have three 28's here. 2 year 2000 engines and one 2005 engine. Both of the older engines smoke on startup where as even in the winter the newer 2005 315 variant has little if no smoke even in the winter.

Give the engine a good service and see if it makes a difference.

[socalmike]

His are 2005's I believe. Mine is a 2001. 6lp ste. Valve seals were done by previous owner.

[socalmike]

Injectors are in the shop for service. Will be back in this week. Will advise if this fixes the issue. There was a good amount of carbon build up on the tips.

[catalina_mike]

I run Lubrication Engineers diesel additive to prevent and clean the system. Pump timing and pressure should be checked and adjusted..