Not quite sure why it’s called tappet adjustment as its really the rocker to valve gap that is being adjusted. Although I guess it in effect adjusts an equivalent gap down on the tappet to cam gap.
The rocker cover has been getting a bit noisier lately so I thought it time to check tappets again as it’s been several years since the last time.
This time I’m doing it cold which means a gap of 15 thou. I am a big believer in the SPQR (now Gunsons) Tappet Adjuster tool. 15 thou is equivalent to somewhere between 7 and 8 clicks …… so I went for 7 clicks and a bit. The tool makes the job a lot easier so long as the threads on the rocker screw are good and turn easily – unless someone in the past has damaged or over tightened them.
Job done in 30 minutes and then started the engine to a tappet noise free engine.
For more info on the additional top lubricant line see …….. https://mgb.tips/category/projects/added-rocker-lube-rail/
More about the tool at …… https://mgb.tips/2019/12/14/clik-adjust-rocker-gap-setting/
The main benefit using the tool is that if the gap is worn dome or curve shape then a flat feeler gauge will never give a correct gap.
MGB tips mods and maintenance 