2305 engine needs to be rebuilt

[PCABE5]

I could be wrong but the reason I have not question the mechanic on the possible bad rings was that I thought the crankcase vent tube was directed back into the air intake cover, which would explain the presence of oil if their was a major blow-by in the crankcase. Also keep in mind that only the air intake on top of the engine was saturated with oil, not the air filter. Jim, if you are familiar with this engine maybe you can confirm the vent tube in the air intake. Thanks!

The vent tube is not the only source of oil on this engine. The valve cover and intake are one in the same and only a gasket separates them. My old 2320 had to have that gasket replaced because it leaked into the intake.

 

[tomd999]

Hiya,

Having destroyed and rebuilt many engines racing and pulling I offer these thoughts:

1) leaking/bad injector in the one cyl that takes a bit to clean out when you fire it up could have dumped enough fuel to cause a semi-hydralic lock situation and the pressure caused by trying to compress the liquid fuel could have broken the ring lands, compression rings or even cracked/collapsed the piston crown. (Also, depending on valve/head design, you could have sunk them a bit if there was enough fuel in there) I have also seen bent wrist pins from this condition.

2) The oil control ring drain holes may blocked or may not be there at all. I have seen many piston out of the box that had the holes not drilled

3) You may have erroded the piston crown and now the cyl has lower compression than the others. I have seen this in over boosted or over fueled Cummins in the Dodge trucks from people just "turning the screw" or changing the cam on the pump to get more power without keeping an eye on the exhaust temps. With an injector not functioning correctly, you could have over fueled that cylinder.

Of course all of this is a WAG without seeing and hearing the engine. I have personally seen/caused the failures I have mentioned so they are possible however I did them on engines far from stock and running boost and fuel levels that would make people question my judgement.

My 2 cents,

Tom

 

[Henri88]

The vent tube is not the only source of oil on this engine. The valve cover and intake are one in the same and only a gasket separates them. My old 2320 had to have that gasket replaced because it leaked into the intake.

So what you are saying is the intake cover is also holding down the valve cover. Oil could be suck-up by the intake. Seems to make sense. Wish I had a service manual. I got one ordered. Do you recall the symptom or how you find out that you had a leaking gasket. If anyone have a diagram of this engine, I would sure appreciated it until I get my own book. Thanks! :thumbsup:

 

[Henri88]

Hiya,

Having destroyed and rebuilt many engines racing and pulling I offer these thoughts:

1) leaking/bad injector in the one cyl that takes a bit to clean out when you fire it up could have dumped enough fuel to cause a semi-hydralic lock situation and the pressure caused by trying to compress the liquid fuel could have broken the ring lands, compression rings or even cracked/collapsed the piston crown. (Also, depending on valve/head design, you could have sunk them a bit if there was enough fuel in there) I have also seen bent wrist pins from this condition.

2) The oil control ring drain holes may blocked or may not be there at all. I have seen many piston out of the box that had the holes not drilled

3) You may have erroded the piston crown and now the cyl has lower compression than the others. I have seen this in over boosted or over fueled Cummins in the Dodge trucks from people just "turning the screw" or changing the cam on the pump to get more power without keeping an eye on the exhaust temps. With an injector not functioning correctly, you could have over fueled that cylinder.

Of course all of this is a WAG without seeing and hearing the engine. I have personally seen/caused the failures I have mentioned so they are possible however I did them on engines far from stock and running boost and fuel levels that would make people question my judgement.

My 2 cents,

Tom

Tom, thanks for the thoughts. I just hope they will be able to tell me what cause the problem what ever the problem is, hopefully by tomorrow.

 

[Henri88]

Usually don't hear much bad about the Yanmar engines. Sounds like a hair got crossways on yours, as you couldn't have done better with maintenance from what you say.
Good on the dealer to reassure you to not worry. Doesn't surprise me from Deere or their dealer. I suspect they are as surprised as you, and realize it has been happening for awhile and didn't just start from abuse.
But sorry to hear you are without for awhile. That is hard to take.

Funny thing about this is all of my equipments was bought from this dealer and by the same salesmen. Also had good communication with the service manager, and now my salesmen is the service manager and the service manager before him is back as a mechanic working on my JD. It can't get any better than this.

 

[PCABE5]

So what you are saying is the intake cover is also holding down the valve cover. Oil could be suck-up by the intake. Seems to make sense. Wish I had a service manual. I got one ordered. Do you recall the symptom or how you find out that you had a leaking gasket. If anyone have a diagram of this engine, I would sure appreciated it until I get my own book. Thanks! :thumbsup:

I was using oil and I found oil in the intake. A service told me to take the hose off and check for oil and there was oil. When I took the cover off I could see where the oil was coming under the gasket.

If you look in JD parts you can see the pictures. The valve cover and intake are the same cover and separated by a gasket.

 

[Henri88]

I was using oil and I found oil in the intake. A service told me to take the hose off and check for oil and there was oil. When I took the cover off I could see where the oil was coming under the gasket.

Don't think this is the case here. The whole cover including the 3 air intake port was covered with oil. I think if it was coming from the gasket we would've seen it. Thanks for the info.

 

[Henri88]

Quick update! Been a week so I call to see what they had found and how long it would be before I get it back. The answer, ''Sorry, we did not look at it yet. We have to check the compression in the cylinders first and we are missing an adapter for our compression gauge. :thumbdown: :mur: I ask them to ''please look at it as soon as possible. It would be nice if you put a rush on it.'' Not as rosy as I thought it would be. I am pass my warranty here and I don't want to piss them off. What to do, what to do?

 

[rsewill]

This time of year the dealer is probably taking care of his 'big tractor' farmers And ticking sounds like a bad injector.

 

[Henri88]

This time of year the dealer is probably taking care of his 'big tractor' farmers And ticking sounds like a bad injector.

Would a bad injector explain why the fuel filter was pitch black?