Bobcat 863 PCV question

chrisk1500 · Apr 16, 2025

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 · Apr 16, 2025

chrisk1500 said:
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 · Apr 16, 2025

I can get a pic tomorrow

Serial: 514416629

chrisk1500 · Apr 17, 2025

fortworth-cowboy said:
could you take a picture and give me also your serial #?!

fortworth-cowboy · Apr 17, 2025

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 · Apr 17, 2025

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 · Apr 17, 2025

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

chrisk1500 · Apr 18, 2025

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

chrisk1500 · Apr 18, 2025

I will try to attach a video

fortworth-cowboy · Apr 18, 2025

chrisk1500 said:
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 · Apr 18, 2025

It's not overfilled.

It's right on the full mark

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

chrisk1500 · Apr 18, 2025

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 · Apr 18, 2025

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

spitzair · Apr 19, 2025

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 · Apr 19, 2025

Remember that Deutz is an oil cooled engine.

Bobcat 863 PCV question

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