9/25/2023 0 Comments Engine and transmission mountsholes and pilots off center a little, or maybe a bad stackup so the converter face is too close to or too far from ( axially ) the crank flange. a little dirt on the crank flange face or the engine flange face, radial misalignment, e.g. Other possible causes include angular misalignment, e.g. Some flex is normal from torque transmission, when the plate wrinkles a little. I.e., the reference is certainly to u-joints.įlex plates fail from flexing. More likely, the extra vibration on accel/decel will kill your u-joints pretty quickly. If the terrain is flat like here in SoFla, and you drive super gently (not always possible in SoFla), you might drive around with a broken motor mount for months without noticing. At the same time, the u-joints are at different angles, which introduces another torque variation that isn't ordinarily present. Then the engine/transmission drops, and the cycle restarts. When a motor mount is broken, the transmission output torque goes into rotating the entire engine and transmission about an axis through the two surviving mounts, for the few cm until it hits something, or until the vehicle moves. I like how strong the language regarding the effect is - " destruction" and how vague the language regarding the cause is - " certain components" RE: Engine Mounts - Drivetrain Misalignment pontiacjack (Electrical) 12 Dec 12 01:18 The housing of the torque converter is bolted to the crankshaft, but the turbine and oil pump gear are in fixed relationship to the transmission casing. I am wondering if the torque converter is the culprit. WHICH drive train components are they referring to, and how are they affected? they often weigh around 200 pounds in service.įlex plate failures are common on GM trucks so it begs the question. When a single mount breaks, the remaining mounts are subjected to abnormally high stresses."Ĭonventional wisdom says that the engine and transmission are aligned by the dowels and secured together with a number of bolts.īut transmission casings are fairly flexible and could allow some alignment changes if not supported properly. "Notice: Broken or deteriorated mounts can cause misalignment and destruction of certain drive train components. Hello, I stumbled across this odd note from GM's engineers in their service manual:
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