Toyota Cressida and Van 1983-1990

Valves and Springs

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Use a valve spring compressor tool to relieve spring tension from the valve caps



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Fig. Fig. 2 A small magnet will help in removal of the valve keepers



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Fig. Fig. 3 Be careful not to lose the valve keepers



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Fig. Fig. 4 Once the spring has been removed, the O-ring may be removed from the valve stem



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Fig. Fig. 5 A magnet may be helpful in removing the valve keepers



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Fig. Fig. 6 Remove the spring from the valve stem in order to access the seal



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Fig. Fig. 7 Remove the valve stem seal from the cylinder head



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Fig. Fig. 8 Invert the cylinder head and withdraw the valve from the cylinder head bore



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Fig. Fig. 9 A wire wheel may be used to clean the combustion chambers of carbon deposits



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Fig. Fig. 10 A dial gauge may be used to check valve stem-to-guide clearance



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Fig. Fig. 11 Valve stems may be rolled on a flat surface to check for bends



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Fig. Fig. 12 With the valve spring out of the way, the valve stem seals may now be replaced



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Fig. Fig. 13 Use a caliper gauge to check the valve spring free-length



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Fig. Fig. 14 Check the valve spring for squareness on a flat surface; a carpenter's square can be used



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Fig. Fig. 15 The valve spring should be straight up and down when placed like this



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Fig. Fig. 16 Use a micrometer to check the valve stem diameter

  1. On the 5M-GE engine, remove the individual rocker arms and valve lash adjusters from the cylinder head. Arrange the rocker arms and lash adjusters in the order in which they were removed.
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  3. On the 7M-GE engine, remove the camshaft bearing cap bolts in several passes. Remove the camshaft bearing caps, oil seal and camshaft. Remove the valve lifters and shims. Arrange the valve lifters and shims in the order in which they were removed.
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  5. Block the head on its side, or install a pair of head-holding brackets made especially for valve removal.
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  7. Use a socket slightly larger than the valve stem and keepers, place the socket over the valve stem and gently hit the socket with a plastic hammer to break loose any varnish buildup.
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  9. Remove the valve keepers, retainer, spring shield and valve spring using a valve spring compressor (the locking C-clamp type is the easiest kind to use).
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  11. Put the parts in a separate container numbered for the cylinder being worked on. Do not mix them with other parts removed.
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  13. Remove and discard the valve stem oil seal, a new seal will be used at assembly time.
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  15. Remove the valve from the cylinder head and place, in order, through numbered holes punched in a stiff piece of cardboard or wooden valve holding stick.
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  17. Use an electric drill and rotary wire brush to clean the intake and exhaust valve ports, combustion chamber and valve seats. In some cases, the carbon will need to be chipped away. Use a blunt pointed drift for carbon chipping, be careful around the valve seat areas.
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  19. Use a wire valve guide cleaning brush and safe solvent to clean the valve guides.
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  21. Clean the valves with a revolving wire brush. Heavy carbon deposits may be removed with the blunt drift.
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When using a wire brush to clean carbon on the valve ports, valves etc., be sure that the deposits are actually removed, rather than burnished.

  1. Wash and clean all valve spring, keepers, retaining caps etc., in safe solvent.
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  3. Clean the head with a brush and some safe solvent and wipe dry.
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  5. Check the head for cracks. Cracks in the cylinder head usually start around an exhaust valve seat because it is the hottest part of the combustion chamber. If a crack is suspected but cannot be detected visually have the area checked with dye penetrate or other method by the machine shop.
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  7. After all cylinder head parts are reasonably clean check the valve stem-to-guide clearance. If a dial indicator is not on hand, a visual inspection can give you a fairly good idea if the guide, valve stem or both are worn.
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  9. Insert the valve into the guide until slightly away from the valve seat. Wiggle the valve sideways. A small amount of wobble is normal, excessive wobble means a worn guide or valve stem. If a dial indicator is on hand, mount the indicator so that the stem of the valve is at 90° to the valve stem, as close to the valve guide as possible. Move the valve off the seat, and measure the valve guide-to-stem clearance by rocking the stem back and forth to actuate the dial indicator. Measure the valve stem using a micrometer and compare to specifications to determine whether stem or guide wear is causing excessive clearance.
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  11. The valve guide, if worn, must be repaired before the valve seats can be resurfaced. Some manufacturers supply valves with oversize stems to fit valve guides that are reamed to oversize for repair. The machine shop will be able to handle the guide reaming for you. In some cases, if the guide is not too badly worn, knurling may be all that is required.
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  13. Reface, or have the valves and valve seats refaced. The valve seats should be a true 45° angle. Remove only enough material to clean up any pits or grooves. Be sure the valve seat is not too wide or narrow. Use a 60° or a 45° grinding wheel to remove material from the bottom of the seat for raising and a 30° or a 45° grinding wheel to remove material from the top of the seat to narrow.
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  15. After all valve and valve seats have been machined, check the remaining valve train parts (springs, retainers, keepers, etc.) for wear. Check the valve springs for straightness and tension.
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  17. Hand lap the valve and valve seat with an abrasive compound. After hand lapping, clean the valve and valve seat.
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  19. Insert the valves into the cylinder head valve guides. Make sure that the valves are installed in the correct order.
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  21. Install the valve spring seats and new seals. Install the springs and spring retainers on the valves.
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  23. Block the head on its side, or install a pair of head-holding brackets made especially for valve removal. Using a valve spring compressor tool, compress the valve springs and place 2 keepers around the valve stem. Tap the valve stem lightly to assure the proper fit.
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  25. On the 7M-GE engine, install the camshaft, oil seal, bearing caps and bearing cap bolts in several passes to obtain a final torque of 14 ft. lbs. (20 Nm). Install the valve lifters and shims. In the same order in which they were removed.
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  27. On the 5M-GE engine, install the individual rocker arms and valve lash adjusters to the cylinder head. In the same order in which they were removed.
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  29. Reassemble the head in the reverse order of disassembly using new valve guide seals and lubricating the valve stems. Check the valve spring installed height, shim or replace as necessary.
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