Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks
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With my timing set with a light on TDC. My 216 is quiet at low rims in the garage and on the road. At 15mph in first, 30 in second or 45 in high, it starts this sound like an old diesel injector pump.
Disconnected the vacuum advance and the sound moved up in rpm's. Still showed up though. However, in the garage, I could not make it rattle at any rpm. With vacuum advance connected, it would rattle in the garage. Disconnect and there's no rpm in the garage where it rattles. Please! Would appreciate some help. Thanks
I would suspect your problem is in the distributor. The Delco distributors had centrifugal advance built into the distributor. Two weights counter balanced with small springs would advance the spark in addition to the vacuum advance. I am thinking one or both springs are weakened or broken which would advance the spark prematurely at mid-range speeds and the rattling would disappear as the engine reached higher RPMs. Has the distributor shaft been lubricated? a sloppy distributor shaft could also play havoc with timing issues. There are other possible problems that would require knowing the year of the vehicle, if the engine and the flywheel are original, has the electrical system been converted to 12 volt, and the model number of the distributor would all be helpful.
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