Oil & Fuel oil blow by

[Barry72]

I am new to this forum so I hope someone can give me some direction on my problem I have a yanmar 1610D 3cyl diesel that spits oil out of the valve cover blow by tube I keep the oil changed on a regular basis and use rotella 15W 40. after new oil is added the blow by almost stops, but as the oil thins it gets worse. I can easily lose 6oz in one hour getting to be a pain to keep a bottle at end of tube to catch all the drips coming out. any tech support will help

 

[California]

I thought rings blowby would push vapor, not drops of liquid oil.

Pull the dipstick out and see if lots of pressure comes out there. If not then you might just have the rocker oiling going nuts and spurting - a much less expensive repair. you could pull the valve cover off to further investigate this.

 

[winston1]

I'm sure it is ok but got to ask about your oil level. Not to high is it? Does it blow anything like this? Yanmar 155D Crankcase Vent - YouTube

 

[eddie48]

Coupled with winston1's comment and yours about the oil thinning out, are you getting fuel into the oil as the engine runs or sits? I'm surprised that the oil actually thins out.

 

[Barry72]

just tried your sugest with the dipstick. slight pressuere and oil ozzes out slightly. watched winston1 vedio and yes it does that but with oil dripping out oil level is not high. I hope whatever rocker fix you have might work

 

[Barry72]

no fuel in oil and the oil thinning is just as the oil breakes down with use and wear

 

[kenmac]

My opinion,,, You're in for an engine rebuild

 

[winston1]

My opinion,,, You're in for an engine rebuild

Afraid I have to 2nd kenmac if your blow by is much like the video.

 

[clemsonfor]

If it is like the video you will need to rebuild it to some degree.

I have had mine start to blow by. I can really only see it when the sun is right, but i suspect it will still last many more years for me as many hours as i put a year on it. And its NO WHERE near the video that keeps getting posted here.

 

[careyo63]

Hoye shows a Piston and 25&50 over. No sleeve? May want to check into that. Hate to have to find a block.

 

[California]

First, I would look under the valve cover to see if large quantities of oil are spurting around - on the theory that this might possibly be the cause for so much oil coming out the vent. (And note the valve cover gasket on some of these is a permanent 'rope' embedded in a grove, or sometimes a reusable rubber gasket, so don't destroy it getting the valve cover off!) But if that doesn't seem to be the problem ...

Assuming this tractor is in typical hobby use, ~50 hours per year and only momentarily at full horsepower output - I don't see a need to overhaul it so long as it starts readily. That's a lot of expense for almost no improvement of usability. 30 year old equipment usually has some 'personality' - peculiarities.

after new oil is added the blow by almost stops

Ok, on this one frequent oil changes prevent excessive smoke. You might try straight 30 wt oil as specified in the Operation Manual to see if that lasts longer before smoking. I would just accept that this engine is nearing overhaul - but its not there yet until low compression limits its ability to start. That could be many years from now if its not in commercial use. Perfection and elegance are nice - but expensive to attain. Perhaps a different tractor would be a better choice if that is as important as usability.

 

[Barry72]

thanks everyone for the help. at least I now know what im in for. I will have to start saving my hard earned dollars for a on frame rebuild

 

[Barry72]

you are right about perfection, I have lived with this for several years and have devised a catch container for the dripping oil. I have 250 hrs on tractor since I bought it 6yr ago although the hours are hard hrs. I blame myself for this issue because I pushed my tractor to its limints many times

 

[Soundguy]

I have seen a farmer fix by taking tubing to put the vent back to the dipstick, with a T fitting and an upright riser tube that then turns down like an upside down J.

End result is that blown oil goes out the vent and back to the dipstick hole. pressure is vented out the tube. the turn down prevents dust and water from freely entering the vent stack.

this fix works better on some setups than others. IE ones in which trhe dipstick is on the lower side of the engine.. etc..

 

[Barry72]

not a bad idea

 

[Soundguy]

you'll have to get a hair creative with tubing and piping.. perhaps some combo of both.. and a zip tie or 2 and some copper wire and black tape to make the J.. but as said.

I've seen it done and it turns an oil dribbler to one that just blows... saves ya from bailing wiring a soda bottle down under the tube as a catchpan..