Paccar 12.9 L
Paccar 12.9 2020
Cylinder Head
Short YouTube Video of Surfacing with CBN cutter 2020
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- Head Cracks
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- Note: Injector protrusion spec 0.90″ to .100″ Max
Block liner counter bore machined for .25mm shims and .004/.007 protrusion 2020
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- Liner part # 1974295
Crankshaft balancing – non counter weight crankshaft style
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- Paccar 12.9 Balancing
Paccar 12.9 has no counter weights so we welded on the back rod in the factory balance holes.
Balance Weights ROD PISTON ROD #
Piston kits 1834374
#1 10132 Grams 4784 5348 CY63
#2 10133 Grams 4807 5326 CY79
#3 10131 Grams 4789 5342 CY67
#4 10133 Grams 4801 5332 CY53
#5 10132 Grams 4800 5332 CY64
#6 10132 Grams 4784 5348 CY51
FINAL Balance on crankshaft
LEFT side 0.8 Oz/inches RIGHT Side 0.8 Oz/inches COUPLED 0.5 Oz/Inches
Crankshaft was RECEIVED at from the Factory
LEFT Side 5.5 Oz/Inches RIGHT Side 3.5 Oz/Inches (WAY OFF) Truck mirrors vibrated which is typical on Paccar 12.9 Truck motors and now no more vibrating!