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Bamaman39, Ford Technician
Category: Ford
Satisfied Customers: 2288
Experience:  10 years ford experience, Ford Senior Master Diesel And Gasoline Tech
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1990 ford f250: I need the steps taken to replace rear main seal..pull

Resolved Question:

I need the steps taken to replace rear main seal on a 1990 ford f250 4x4 with a 460 motor, do i need to pull the transmission, i see the seal is two pieces, how long will it take ?
Submitted: 6 years ago.
Category: Ford
Expert:  Bamaman39 replied 6 years ago.

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Here are the only instructions i could find for you. They say to drop the oil pan.Also the book pays 9.5 hours. So its a big job.




A split lip-type crankshaft rear oil seal is provided for servicing these engines.

  1. Remove the oil pan and the oil pump, if required.
  2. Loosen all the crankshaft main bearing cap bolts, thereby lowering the crankshaft slightly but not to exceed 0.7938 mm (1/32 inch) . CAUTION: Use care to prevent scratching or damaging the crankshaft sealing surfaces.
  3. Remove the rear crankshaft main bearing cap, and remove the crankshaft rear oil seal from the rear crankshaft main bearing cap and cylinder block. On the cylinder block half of the crankshaft rear oil seal use a seal removal tool, or install a small metal screw in one end of the crankshaft rear oil seal, and PULL on the screw to remove the crankshaft rear oil seal.






Service and Repair
  1. Remove engine cover (E series), then disconnect battery ground cable and drain cooling system.
  2. Remove air cleaner, then disconnect throttle and transmission linkages at the throttle body.
  3. Disconnect power brake vacuum line, if equipped.
  4. Disconnect fuel line at the fuel rail and air tubes at the throttle body, then remove air cleaner adapter from throttle body.
  5. Disconnect upper and lower radiator hoses and transmission oil cooler lines (if equipped) from radiator.
  6. Remove fan shroud, fan and radiator.
  7. On models equipped with power steering, unfasten steering pump and position aside.
  8. On all models, remove front engine mount through bolts, then the engine oil dipstick tube.
  9. On models equipped with A/C, move refrigerant lines from rear of compressor downward to clear dash, or remove lines if necessary.
  10. On all models, raise and support vehicle.
  11. Drain engine oil and remove oil filter.
  12. Remove muffler inlet pipe assembly, then disconnect manual and kickdown linkages from transmission.
  13. Remove driveshaft and coupling shaft assembly, then the transmission dipstick tube.
  14. Remove dipstick and tube from oil pan, then position a suitable jack and a wooden block under oil pan. Raise engine slightly until transmission contacts floor, then block engine in place at the mounts. NOTE: The engine assembly must be raised exactly four inches and remain centered in the engine compartment to remove the oil pan.
  15. Remove oil pan attaching bolts and lower the pan.
  16. Remove oil pump and pickup tube assembly and lay in oil pan, then slide oil pan rearward and remove from vehicle.
  17. Reverse procedure to install. Tighten 1/4 and 5/16 inch oil pan bolts to specifications.

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