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Recent content by A-aron

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    Bobcat 873f 1999 - blows smoke and oil out exhaust

    ****Repair resolution***** The final consensus was there were several things going on. 1. Most notably the crank case vent passage in the cylinder head that runs from valve cover vent to front of the head was completely plugged with carbon and oily residue. 2. Valve stem seals were out of...
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    Bobcat 873f 1999 - blows smoke and oil out exhaust

    More photos
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    Bobcat 873f 1999 - blows smoke and oil out exhaust

    Well the heads off. Unfortunately I don't see anything obvious. There's carbon buildup at the top of each bore and around the intake valves but the head gasket and sealing surfaces appear consistent. There's not anywhere that it looks "blown out"
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    Bobcat 873f 1999 - blows smoke and oil out exhaust

    That makes sense to me, but what I'm getting lost on is How does the head gasket cause what is presenting as excessive blowby/crankcase pressure?
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    Bobcat 873f 1999 - blows smoke and oil out exhaust

    Update Pulled the airbox and tubes. Little to no oil in intake. Ran compression test - cranked 5-6 strokes (counting From front of engine) Cyl1 - 300 Cyl2 - 410 Cyl3 - 410 Cyl4 - 410 (All built 200psi on first stroke) Ran engine and if I remove the oil cap engine doesn't smoke from exhaust...
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    Bobcat 873f 1999 - blows smoke and oil out exhaust

    I agree it's the most likely but is there any way to test it/confirm short of tearing the head off?
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    Bobcat 873f 1999 - blows smoke and oil out exhaust

    3100hrs Duetz 1011 Short story - billows smoke and oil vapor out exhaust, starts great, runs great otherwise. Long story - recently purchased machine. Was used by landscaping company and fleet maintained till 2019. Owner sold company and kept machine for home use. Less than 5hrs since little...
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