step 3 - 2.0 diagnostic procedure of part 3
It is then required to remove all timing chain components and do a visual inspection on all the timing chain components and look for broken guides, defective tensioners, stretched timing chain, broken balance shafts, excessive wear on camshafts, excessive wear on camshaft bearing bracket, damaged adjuster, broken rocker arms, and sludge buildup. When the oil changes are not done at 5000 miles, the engine starts to buildup sludge and this can cause the tensioners to collapse and fail, cam adjuster to fail and not allow it to advance and retard the timing when the ecu demands a action, and guides get worn out excessively to the point that they become weak and bridle and break into multiple pieces which can cause a oil restriction anywhere in the oil lubrication system leading to more damage in the engine. Due to improper or lack of lubrication can cause the roller pins in the rocker arms to become worn out and disassemble from the rocker arm causing tapping, metallic, and clinking noises etc and lost in performance. Excessive carbon buildup causes injectors to fail and the engine to run lean and major engine damage can be caused such as burned or broken valves, valves to not seat properly causing misfiring, piston rings to get damaged and detonation in the cylinder. Because of a correlation problem between the cam to crank or carbon buildup we also do a cylinder leak down test to check for bent valves, broken valves, valves not seating properly, damaged pistons, and damaged piston rings etc..