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#1
02-02-2008, 08:43 PM
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FYI: OM617.951 valve guides bad
This is an engine I am rescuing.
Massive smoking + Massive blow by into air cleaner. It still had great power on the highway, and was getting 24 MPG. Bad head gasket + possible minor warped head = could be serviced. Cylinder #1 compression 380 psi. Cylinder #2 compression 350 psi. Cylinder #3 compression 100 psi + soaked with diesel. Cylinder #4 compression 350 psi. Cylinder #5 compression 380 psi. The following damage turned this head into a core. Cam lobes and rockers show excess wear = flat spots and scalping. Slop on the valve guides is 0.44 + not minus. Valve stem seals are all junk. Exhaust valve faces and seats show serious deterioration. All valve stems show serious scoring and wear. I found a good used head to replace it 128,000 miles, and still looks new. Went back for the bottom end.  More data and pictures later. #################### om617 head warp permissible unevenness of parting surface: Longitudinal direction 0.08 mm Transverse direction 0.0 mm Have a great day.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ Last edited by whunter; 12-30-2013 at 05:23 PM. 
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#2
02-03-2008, 08:46 PM
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Maybe out of a white TD from Texas?
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83 300d - 390k
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#3
12-30-2013, 05:31 PM
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Hmm
I forgot about this one.
For closure. Sorry, I can't find the pictures. The cylinder head was perfect. The owner is happy. 125k on the engine since the repair. The only issue since then was a failed primer pump.  .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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