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Checked the valve clearance - two intake and one exhaust valve were ever so slightly loose. Adjusted accordingly.
On a hunch, I replaced the crush washer and o ring around #1 delivery valve.
I buttoned up and restarted to no avail. It still pulses. Think Harley Davidson, but nowhere near as loud - just a mild thud-thud-thud from the exhaust with a shaking engine. It goes away at higher RPMs.
No other unusual engines sounds.
No champagne bubbles in the pre filter.
The only thing different is #1 delivery valve spring. I ordered a few replacements from a local Bosch shop. I could be mistaken, but I thought they were all replaced when the IP was rebuilt. If so, they should all be the same part # and not too far apart in age.
If they weren't replaced, would having one new spring (or possibly incorrect part number) alongside three old be an issue?
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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.
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