I'm inclined to think my engine is a tapper but not so sure not if it's the valves or piston rings causing loss of compression. Theres definitely a tapping noise compared to videos I've watched. Not as loud as some. Also on cold start the tapping is sometimes much quieter that when the engine is warm.
Just had my mechanic do a compression test.
The readings were very similar open and closed throttle.
85 85 95 85
When putting oil in the bores we got :
175 150 175 175.
He suspects worn piston rings causing low compression. The engines done 182000 miles and from service history has had the head off at some point. But its vague as to why the work was done other than the notes saying 'as seemed necessary'.
I've had the cam belt done recently and the crank pulley was slipped on retiming it back up so had a new pulley fitted and timed up correctly.
The engine runs and pulls well.
I just dont know whether to rebuild the engine, get the head and valves tested, or buy a second hand engine and rebuild that.
Anyone have any thoughts on which direction I should go?
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Steve