In Car Valve Spring Replacement
Hank Terry - hterry@parker.com
You Will Need
Here is a very affordable and fairly painless procedure for replacing the valve springs on an 86-87 GN/TR:
  • 3 feet of 3/8 inch rope. Avoid plastic coated or heavy nylon
  • NAPA 13/16, 3/8 inch drive crowfoot socket wrench. Part # NCF26. Other brands will work but they should not be offset.
  • Typical TR tools; i.e., 10mm, 15mm socket/wrench, crescent-hammer and other appropriate tools to remove spark plugs, valve covers, heater hoses and heater hose pipe.
  • 1/2 inch ratchet and socket that will fit the alternator pulley nut.
  • A small magnet is handy.
Procedure
  1. Remove all spark plugs. Yep, # 6 too!
  2. Drain the radiator.
  3. Remove heater hose to heater core and heater hose pipe on right side of motor and pull off as an assembly including heater control valve.
  4. Remove valve covers.
  5. Remove rocker arms/shafts.
  6. Remove push rods. I usually take an old shoe box, mark 'front' and with the box upside down, punch the PRs through the box and in order as removed. Pre-punching the box with a screw driver won't hurt.
  7. Select a cylinder and using the alternator with ratchet and socket, rotate until selected cyl piston is visible through the spark plug hole.
  8. Rotate CCW about one full turn.
  9. Fill the cylinder with as much rope as possible through the spark plug hole. Should take about all 3 feet and I usually leave a few inches of rope out.
  10. Rotate the alternator CW until TIGHT. If the belts slips, exert additional pressure against the belt. I use a wooden wire brush handle.
  11. Rap the retainers to unseat the keepers on selected cyl. (ext. & int). If you are good, use just a hammer. I like to use a brass rod, about 1 inch dia by 6 inches long and a hammer
  12. Using the crowfoot, insert one of the rocker arm shaft bolts through the 3/8 square hole and attach to the rocker arm shaft tower and center the 13/16 crowfoot on the VS retainer. I like to have a flat washer between the bolt head and crowfoot. The crowfoot (NAPA) should be positioned with the boss at the 3/8 inch square hole UP, and the NAPA part # DOWN. Tighten the bolt at which time the crowfoot will compress the VS.
  13. Remove the keeper halves and then remove the crowfoot, retainer and VS
  14. Reverse order for new VS installation
  15. After doing the exh. and int. of the selected cyl., rotate alternator CCW and remove rope.
Notes and Tips
Note:

    I remove the heater hose/pipe stuff because it is just easier to r & r the valve cover. It is not absolutely necessary.

Tip:

    Take a q-tip swab or similar and get that oil out of the valve cover bolt holes! If you do not, when replacing VC with new gasket, when the bolt is inserted it will push out oil between that nice new VC gasket and head setting up a potential source for leakage. I also plug the oil return holes with a little piece of cloth. Those keepers are pretty small and oil is pretty slippery! Naturally, there is a 'technique' to maneuvering the spring a little so the keepers will come off. Sometimes you may have to re-center the crowfoot on the retainer once in a while so it compresses evenly. I use a screw driver and wedge it between where appropriate and move the compressed spring so the keepers will slide off the valve stem. Just take your time and by the time you have one or two cylinders swapped you'll be cruising through the remainder.

I hope this helps somebody out and that I didn't miss anything too important!


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