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Hello. I have a recently restored 16v engine, with almost everything changed. The problem is, that after the engine is up to 80c temp, if I rev hard, almost anytime after, I hear the sound of a tappet clicking in 0-3000 rpm range. If I rev higher, no clicking, and then even at idle the clicking stops, till it comes again 5-10 mins later. Any help welcome.
 

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Are you sure it's the tappets?
Very common problem unfortunately with these hydraulic tappets. Any particular side or cylinder?
Were new tappets put in? What type/make? Maybe one has failed.
What about the cams?

When new cams are put in they 'mate' with the new tappets during the 20 min break in period.

Can you upload a video?

What's the oil pressure at idle hot?

I had a ticking noise at idle hot. Opened her up and found a concave tappet and bits of cam lobes around the engine:(

;)
 
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