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I've been through TM 9-2320-289-20 Page 207 onwards and can't find any reference to some kind of mechanical valve in the exhaust ... sounds like the power valve system in my old RGV and YPVS ... Those were the days :naner:
Had the same issue and a little service cured it ... see this
https://www.steelsoldiers.com/showthread.php?171432-Clunk-but-doesn-t-Always-turn-over
It might help save some $$
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