tuossa kun nettiä on selannut niin ei montaa tapausta ole että venttiilit on perhe dieselissä mennyt poikki.
tällainen sattui silmään:
ENGINE VALVE BREAKAGE
Breakage, which is the other main type of valve failure, can happen to either intake or exhaust valves. Valves break in one of two places, where the head is joined to the stem, or where the keeper groove(s) are machined into the end of the stem. Either way, breakage is bad news because the pieces fall into the combustion chamber and wreak havoc on the piston and head.
Causes of head breakage include fatigue failure from valve flexing (from off-square seating that causes the stem to flex every time it seats), pounding (from excessive valvelash), stretching (from excessive heat and/or rpm), and thermal shock (sudden temperature changes as when abruptly shutting off a highly loaded engine). With two-piece valves, the junction between the stem and head is where the valve often cracks and separates, not because the valve is defective (though a poor weld could be a factor) but because this area is highly stressed due to the joining of two dissimilar alloys.
Breakage at the stem tip can result from excessive sideloading if the installed stem height is not right and causes rocker arm misalignment. It can also be caused by excessive valvelash that prevents the valvetrain from cushioning the valve as it closes. Another condition that may cause the tip of the stem to snap off is wear or scratches in the keeper groove(s) or coil bind (running a cam or rocker arms with too much lift).
ei todellakaan syytä ketään asiasta, onhan auto ajuttu jo sen 200tkm+ mutta toisaalta alla ollut autojakin joita erilailla "pahoinpidelty" ja kestäneet.
Tämäkin tapaus sattui 18000rpm ja vakkarilla jonossa ajettaessa.
kunhan kyselen ja opin, ettei nyt ihan kuseteta korjaamolla ns helpommin kuin koiraa!
en ole viittinyt ottaa tätä puhelimessa, käyn sitten 27/12 silmätysten juttelemassa.
mukavaa joulua kaikille....!