17-04-2023, 07:28 PM
Hi Denis
My first thought was that maybe the pistons and rings were lacking a little lubrication - they would normally be covered in oil from the last time of running, and would be re-covered by splash once the engine had run up for a bit, but with a fresh assembly could possibly be a bit dry initially ? A squirt of engine oil down the bores and a few turns on the starting handle with the plugs out would eliminate that cause.
However, the sound on the video is (to my ears) more like something rubbing on a part that is continuously rotating rather than the 'pulsed' sound you would get from pistons reciprocating in the bores. It's not an over-long starter motor bolt rubbing on the flywheel is it ?
My first thought was that maybe the pistons and rings were lacking a little lubrication - they would normally be covered in oil from the last time of running, and would be re-covered by splash once the engine had run up for a bit, but with a fresh assembly could possibly be a bit dry initially ? A squirt of engine oil down the bores and a few turns on the starting handle with the plugs out would eliminate that cause.
However, the sound on the video is (to my ears) more like something rubbing on a part that is continuously rotating rather than the 'pulsed' sound you would get from pistons reciprocating in the bores. It's not an over-long starter motor bolt rubbing on the flywheel is it ?