Question about 1992 Ford Explorer

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  • rlcab Oct 13, 2010

    Thanks Duane for your time. I need sometime to follow your expert advise. but I'll try to do it, to save. I'm not a tech but with your guideline, believe it can be done. T.Y.



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I think that my 1979 Honda Accord had adjustable tappets, but the later model Ford vehicles don't have an adjustment. The noise may be coming from a worn engine, but if it's that bad, then it may require an overhaul.: I read the following from my online resource regarding valves in the cylinder head: INSPECTION Now that all of the cylinder head components are clean, it's time to inspect them for wear and/or damage. To accurately inspect them, you will need some specialized tools:

  • A 0-1 in. micrometer for the valves
  • A dial indicator or inside diameter gauge for the valve guides
  • A spring pressure test gauge
If you do not have access to the proper tools, you may want to bring the components to a shop that does. Valves The first thing to inspect are the valve heads. Look closely at the head, margin and face for any cracks, excessive wear or burning. The margin is the best place to look for burning. It should have a squared edge with an even width all around the diameter. When a valve burns, the margin will look melted and the edges rounded. Also inspect the valve head for any signs of tulipping. This will show as a lifting of the edges or dishing in the center of the head and will usually not occur to all of the valves. All of the heads should look the same, any that seem dished more than others are probably bad. Next, inspect the valve lock grooves and valve tips. Check for any burrs around the lock grooves, especially if you had to file them to remove the valve. Valve tips should appear flat, although slight rounding with high mileage engines is normal. Slightly worn valve tips will need to be machined flat. Last, measure the valve stem diameter with the micrometer. Measure the area that rides within the guide, especially towards the tip where most of the wear occurs. Take several measurements along its length and compare them to each other. Wear should be even along the length with little to no taper. If no minimum diameter is given in the specifications, then the stem should not read more than 0.001 in. (0.025mm) below the unworn portion of the stem. Any valves that fail these inspections should be replaced. Fig. 1: Valve stems may be rolled on a flat surface to check for bends 1992 Ford Explorer:  TOPPET EXTREMELY NOISEY. LOUD - tccs3144.jpg
Fig. 2: Use a micrometer to check the valve stem diameter tccs3910.jpg
Springs, Retainers and Valve Locks The first thing to check is the most obvious, broken springs. Next check the free length and squareness of each spring. If applicable, insure to distinguish between intake and exhaust springs. Use a ruler and/or carpenter's square to measure the length. A carpenter's square should be used to check the springs for squareness. If a spring pressure test gauge is available, check each springs rating and compare to the specifications chart. Check the readings against the specifications given. Any springs that fail these inspections should be replaced. The spring retainers rarely need replacing, however they should still be checked as a precaution. Inspect the spring mating surface and the valve lock retention area for any signs of excessive wear. Also check for any signs of cracking. Replace any retainers that are questionable. Valve locks should be inspected for excessive wear on the outside contact area as well as on the inner notched surface. Any locks which appear worn or broken and its respective valve should be replaced. Fig. 3: Use a calip1992 Ford Explorer: TOPPET EXTREMELY NOISEY. LOUD - tccs3907.jpgthe valve spring free-length tccs3907.jpg
Fig.1992 Ford Explorer: TOPPET EXTREMELY NOISEY. LOUD - tccs3908.jpge valve spring for squareness on a flat surface; a carpenter's square can be used tccs3908.jpg
Cylinder Head There are several things to check on the cylinder head: valve guides, seats, cylinder head surface flatness, cracks and physical damage. VALVE GUIDES Now that you know the valves are good, you can use them to check the guides, although a new valve, if available, is preferred. Before you measure anything, look at the guides carefully and inspect them for any cracks, chips or breakage. Also if the guide is a removable style (as in most aluminum heads), check them for any looseness or evidence of movement. All of the guides should appear to be at the same height from the spring seat. If any seem lower (or higher) from another, the guide has moved. Mount a dial indicator onto the spring side of the cylinder head. Lightly oil the valve stem and insert it into the cylinder head. Position the dial indicator against the valve stem near the tip and zero the gauge. Grasp the valve stem and wiggle towards and away from the dial indicator and observe the readings. Mount the dial indicator 90 degrees from the initial point and zero the gauge and again take a reading. Compare the two readings for an out of round condition. Check the readings against the specifications given. An Inside Diameter (I.D.) gauge designed for valve guides will give you an accurate valve guide bore measurement. If the I.D. gauge is used, compare the readings with the specifications given. Any guides that fail these inspections should be rep1992 Ford Explorer: TOPPET EXTREMELY NOISEY. LOUD - tccs3142.jpghined. Fig. 5: A dial gauge may be used to check valve stem-to-guide clearance; read the gauge while moving the valve stem tccs3142.jpg
VALVE SEATS A visual inspection of the valve seats should show a slightly worn and pitted surface where the valve face contacts the seat. Inspect the seat carefully for severe pitting or cracks. Also, a seat that is badly worn will be recessed into the cylinder head. A severely worn or recessed seat may need to be replaced. All cracked seats must be replaced. A seat concentricity gauge, if available, should be used to check the seat run-out. If run-out exceeds specifications the seat must be machined (if no specification is available given use 0.002 in. or 0.051mm). CYLINDER HEAD SURFACE FLATNESS After you have cleaned the gasket surface of1992 Ford Explorer: TOPPET EXTREMELY NOISEY. LOUD - tccs3919.jpgr head of any old gasket material, check the head for flatness. Fig. 6: Check the head for flatness across the c1992 Ford Explorer: TOPPET EXTREMELY NOISEY. LOUD - tccs3918.jpg head surface using a straightedge and feeler gauge tccs3919.jpg
Fig. 7: Checks should also be made along both diagonals of the head surface tccs3918.jpg
Place a straightedge across the gasket surface. Using feeler gauges, determine the clearance at the center of the straightedge and across the cylinder head at several points. Check along the centerline and diagonally on the head surface. If the warpage exceeds 0.003 in. (0.076mm) within a 6.0 in. (15.2cm) span, or 0.006 in. (0.152mm) over the total length of the head, the cylinder head must be resurfaced. After resurfacing the heads of a V-type engine, the intake manifold flange surface should be checked, and if necessary, milled proportionally to allow for the change in its mounting position. CRACKS AND PHYSICAL DAMAGE Generally, cracks are limited to the combustion chamber, however, it is not uncommon for the head to crack in a spark plug hole, port, outside of the head or in the valve spring/rocker arm area. The first area to inspect is always the hottest: the exhaust seat/port area. A visual inspection should be performed, but just because you don't see a crack does not mean it is not there. Some more reliable methods for inspecting for cracks include Magnaflux, a magnetic process or Zyglo, a dye penetrant. Magnafluxis used only on ferrous metal (cast iron) heads. Zyglouses a spray on fluorescent mixture along with a black light to reveal the cracks. It is strongly recommended to have your cylinder head checked professionally for cracks, especially if the engine was known to have overheated and/or leaked or consumed coolant. Contact a local shop for availability and pricing of these services. Physical damage is usually very evident. For example, a broken mounting ear from dropping the head or a bent or broken stud and/or bolt. All of these defects should be fixed or, if unrepairable, the head should be replaced. Camshaft and Followers Inspect the camshaft(s) and followers as described earlier in this section.

Posted on Oct 12, 2010

  • Duane Wong
    Duane Wong Oct 13, 2010

    You're welcome.



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