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Home >> Triumph >> 1981 >> TR7 Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Triumph Engines - 4 Cylinder >> Crankshaft Main & Connecting Rod Bearings >> Main & Connecting Rod Bearings

Main & Connecting Rod Bearings

  1. Remove engine and separate engine and transmission. Remove clutch, flywheel, engine rear adapter plate, oil pan and dipstick. Remove rear main bearing oil seal, timing chain cover, oil pickup screen and oil slinger. Remove crankshaft sprocket, drive key and shims.
  2. Remove connecting rod bearing caps and slightly push up connecting rod assembly but do not dislodge it from cylinder. Remove upper and lower connecting rod bearings and install protectors over connecting rod bolts. Remove timing chain and main bearing caps. Lift out crankshaft. Remove pilot bushing, upper and lower main bearing inserts and thrust washers.
  3. Examine all bearing journals and determine if regrinding is necessary. When regrinding crankshaft, do not grind journal diameter to less than specified minimum diameter. Examine each bearing half and replace any damaged bearings. Bearings are available in various oversizes. To install, reverse removal procedure making sure that grooves in thrust washers face outward.
MINIMUM CRANKSHAFT REGRIND DIAMETERS

Application In. (mm)
Main Journal 2.0860-2.0865 (52.984-52.997)
Connecting Rod 1.7100-1.7105 (43.434-43.447)