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post #1 of (permalink) Old 01-05-2018, 08:48 PM Thread Starter
bowtie4by
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Engine noise: What is it?

I have a noise in my engine. The sound resembles a wood drumstick lightly tapping the side of the snare. It disappears when I increase revs to 2000 (from idle approx 500). Is it hydraulic tappet? Is it cam chain? Is it piston skirt slap? I've heard a crank-shaft plain bearing go bad but it is not that deep, solid, or hard of a hit. I don't know about con-rod bearing, but I imagine they are similar. There is no loss in power, nor ease of increasing rpm. Any ideas? Oil is Mobil 1 Delvac (Turbo-Diesel-Truck) 5W-40. Used since breakin was completed. It is mostly PAO. Centistokes at 100/40*C are 97.87/14.5.

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Boycotting Castrol for calling their Type III Syntec oil "Synthetic"; Boycotting Mobil1 for changing most of their bases to Type III and refusing to admit. Royal Purple identifies PAO/Type IV as their base; Red Line IDs Group V/ester as base. G80=Gov-Lock=>Locker,auto (not Limited-Slip)
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