Posted by warbaby on May 06, 2021 at 06:09:07 from (24.247.205.221):
In Reply to: 9n valves posted by grandpa Love on May 06, 2021 at 05:00:43:
Possibility #1) The valves are binding in your guides. When the pressure generated by the camshaft lobe on the lifter is greater than the grip of the interference fit between the guide and the valve stem, the lifter's force overcomes the friction of the valve and guide molecular bond and you hear a CLICK or SNAP as the two pieces quickly separate.
Possibility #2) Your guides are loose in the block from wear due to ill-fitted (or fitting) keepers or overzealous prep.. Just how much cleaning did you do to that casting? A quick pass with a brake hone through the guide and lifter bores never hurt anyone, but prolonged grinding here can give you an oversized hole that will allow a lifter or guide room enough to move ever-so-slightly from side-to-side when being articulated, to the point of generating some mechanical clatter.
Possibility #3) You are being overly cautious. What you are hearing are the normal sounds of a collection of metal parts working in concert, but you are hearing them at 1/5000th speed, without the benefit of cushioning oil spray, metal covers, liquid-filled chambers along with other, competing noises (fan noise, exhaust flow, gearbox and rear axle whine) to dampen or distract from the sound. Add to that the sneaking suspicion that if you screw up the preachers tractor, you can almost bet it will be the subject of a sermon at your expense. No doubt you can imagine that by his accounting, the trials and tribulations of Job will pale in comparison to the suffering his poor Ford had to endure in your hands if this rebuild goes awry. Hey, youre doing the best you can with probably half the congregation looking over your shoulder second guessing your every move and I'm sure the pay isnt that great, so what is he expecting, some kind of miracle?
Possibility #4) New hearing aids. If you wear them, take them out. See the difference? That problematic engine now sounds like finely tuned Maserati! When I take mine out my wife's voice goes from Fran Drescher to a slightly muffled Kathleen Turner. Much better. Plus, with them out, if anyone complains about how noisy the valvetrain is on that freshly rebuilt Ford, you'll never hear it OR them!
Possibility #5 Beats me. Put it together and hope for the best. As any mechanic will tell you about any mechanical issue on any type of vehicle when his best efforts are all for naught; They ALL do that!
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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