JUST PURCHASED 97 460; MOTOR HAS TICKING NOISE. OWNERS MECHANICREMOVED VALVE CVRS & STATES OIL SLUDGE; RAN ONE ENGINE FLUSH...STILL TICKS. I CHE
1997 Ford F-250 • 174,000 miles
Just purchased 97 F-250 460; motor has ticking noise. Owners mechanicremoved valve cvrs & states oil sludge; ran one engine flush...still ticks. I checked oil once purchased, had two qts over full mark. I drained out two qts...still ticks. Before proceeding w/possible valve job, any tricks to try?
June 20, 2012.
June 20, 2012.
Sludge won't prevent oil from getting to the lifters but it could keep a few from filling with oil right away. In the '80s it was somewhat common to add a quart of automatic transmission fluid to the oil a couple of days before you planned on changing the oil. That was a lot less expensive than the "mechanic-in-a-can" additives that do basically the same thing.
Overfull oil can cause the lifters to collapse too. The oil gets whipped up by the spinning crankshaft and aerates it. That air compresses and prevents the oil from separating moving parts. If it gets into a lifter, it can take a while to bleed out, especially on engines that send oil up through hollow push rods to the rocker arms.
Ford also had some trouble with the push rods wearing where they contact the rocker arms. Those will cause a clicking noise.
Be sure the engine is reaching normal operating temperature. Low temperature will help blowby condense in the oil, which is what causes sludge, rather than get drawn out and burned. I haven't changed the oil in my '88 Grand Caravan in over nine years and 80,000 miles, (that's abuse, not neglect), but there is no sludge in it. I have to add a quart about every 1500 miles and that helps to maintain at least some of the additives that normally wear out. The point is, it's blowby and low temperature, or a lot of short trip driving, that lead to sludge.
Jun 20, 2012.
Jun 20, 2012.
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