Working on a 2008 lmm, it came to me either the head already pulled and the main problem was the 3 cylinder dropped a valve and needed a piston replacement. Pulled the trans and front diff, dropped pans and slid the rod and piston out and installed a new rod and piston. Through a new std rod bearing in it, new rod bolts etc. Went to put the valve train together after I got one new valve bridge because the one was damaged from the dropped valve..... I started seeing what happened. And I for the life of me can't figure out why. E er valve bridge on this engine is worth. So bad they the stems are just about to pop through the bridge and eventually drop another valve down the road, so I got 16 new valve bridges but I still don't understand what would be the cause of this.
Engine is said to have good oil pressure, said to have the oil changed regularly and I can't see any signs of anything relating to oil starvation. Rocker assemy has been disassembled to check for any discoloration, rod bearing looked like normal wear. What else can I look for to pin point why this happened, I do not want the truck to leave my shop without me knowing I fixed the problem.
Truck is a plow truck, had proper lash setting from what I could tell, has moonshine tune and stock trans, nothing crazy. Any opinions???
Engine is said to have good oil pressure, said to have the oil changed regularly and I can't see any signs of anything relating to oil starvation. Rocker assemy has been disassembled to check for any discoloration, rod bearing looked like normal wear. What else can I look for to pin point why this happened, I do not want the truck to leave my shop without me knowing I fixed the problem.
Truck is a plow truck, had proper lash setting from what I could tell, has moonshine tune and stock trans, nothing crazy. Any opinions???
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