WR 2012 ting ting ting sound when engine hot?

Mountain road haulin the mail all is fine. Enter the woods, plough around at wlking speed and the engine develops a rpm-synchrone ting ting ting sound.

Whatsthat? Valve clearances getting so much larger that even the buddy idling  besides me hears that sound?

 

N.B: effect wers of with increased speed and decreasing woods work.  I'm worried. Anyone know that effect?

 

edit: this is not a knocking ping, happens most profundly at idle.

 

TIA

Rowdy

Edited by WRF-Rowdy

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