Bobcat 863 PCV question

[chrisk1500]

Hi,

I just bought a new to me 863.

It burns oil. You can see and smell it.

My first check is the PCV system.

I have been through the service manual, but my bobcat seems to be different.

It appears as though I should have a PCV canister by the air filter.

However, I only have the breather hose that vents to the ground.

Will mine have the PCV in the valve cover?

Or did a previous owner delete the canister and whole system?

 

[fortworth-cowboy]

Hi,

I just bought a new to me 863.

It burns oil. You can see and smell it.

My first check is the PCV system.

I have been through the service manual, but my bobcat seems to be different.

It appears as though I should have a PCV canister by the air filter.

However, I only have the breather hose that vents to the ground.

Will mine have the PCV in the valve cover?

Or did a previous owner delete the canister and whole system?

could you take a picture and give me also your serial #?!

 

[chrisk1500]

I can get a pic tomorrow

Serial: 514416629

 

[chrisk1500]

could you take a picture and give me also your serial #?!

 

[fortworth-cowboy]

Someone deleted that probably.
What color is your smoke? Because it seems like also that you have an exhaust leak somewhere. There is a lot of soot inside that engine compartment.

 

[chrisk1500]

The smoke is blueish. Smells like burnt oil - not unburnt diesel. I am quite confident it's oil being burnt.

The muffler has a bit of a crack on it. It needs to be replaced.

Will the PCV deletion cause oil burning on the Deutz?

Oil drips a bit out of that vent tube after shutdown. So the oil Vapor from the crankcase is heavy enough to condense inside the tube and drip - I think.

 

[fortworth-cowboy]

Let the engine run and pull out the dip stick, does oil spills out?

 

[chrisk1500]

A small amount of oil pushes out the dipstick hole when I pull the dipstick with it running at a high idle

 

[chrisk1500]

I will try to attach a video

 

[fortworth-cowboy]

I will try to attach a video

View attachment 8692

OK, most likely your piston rings are done and need to be replaced. That Oil should not come out like that unless you overfilled it?!

 

[chrisk1500]

It's not overfilled.

It's right on the full mark

Would a missing/faulty PCV not cause the same issue?

 

[chrisk1500]

The engine fires right up on a cold start and runs strong.

I don't think compression is an issue - but can run a compression test on it to be sure.

 

[fortworth-cowboy]

Well you burning Oil somewhere. Do the compression test and then we will see

 

[spitzair]

Those Deutz engines are famous for blowing head gaskets and then burning oil. Our 873 had the same problem, smoked like crazy and had blowby but always started great even when cold, and a new head gasket fixed the issue. It's not too bad of a job to do if you're mechanically inclined. There are 3 different styles of head gasket used on that engine, and you MUST replace it with the same one you had originally. I just ordered all 3 from Bobcat and then returned the 2 that weren't right.
Hope that helps.

 

[bauertree]

Remember that Deutz is an oil cooled engine.

 

[chrisk1500]

Some more information…

There is a breather valve on the top of the engine on the valve cover.

If I take that breather valve off and run the engine, it burns clean out the exhaust and it doesn't push oil out of the breather tube

I bought a brand new breather valve from Bobcat and installed it - and it went back to smoking and pushing out oil.

Tons of air comes out of the opening where the breather seats in place.

Does this sound more like a head gasket? Or rings?

 

[bauertree]

Some more information…

There is a breather valve on the top of the engine on the valve cover.

If I take that breather valve off and run the engine, it burns clean out the exhaust and it doesn't push oil out of the breather tube

I bought a brand new breather valve from Bobcat and installed it - and it went back to smoking and pushing out oil.

Tons of air comes out of the opening where the breather seats in place.

Does this sound more like a head gasket? Or rings?

I honestly don't know why there would be a difference between having the valve and not. In general, excessive blow-by is caused by worn rings or worn valves along with the valve seals. Cracked head, blown head gasket, clogged muffler spark arrestor might also create symptoms like that but I'm not so sure about that.

 

[bauertree]

Personal I would do a compression test. If it's decent then re-torque that head and maybe run the blow-by hose back to the intake. Then just run it. Older engine have the PVC vent into the open. Newer vent into the engine. Regardless I don't think there should be a bunch of back pressure.