Mudrig150 331 #1 Posted April 30, 2019 We have 6 engines that have had the head off, a K321AQS (Blown), K321AQS (Worn) K301AQS, K321AS (STD), K321AS (.10 over), a Briggs 8hp, and a K161. 2 have burned oil, a K321AS (STD) and the worn K321AQS. 4 have not, the K301AQS, K321AS (.10 over), the Briggs, and the K161. 2 have broken off head bolts. Can you guess which? Yeah, the ones that burned oil. I've noticed they always break the bolts right next to the exhaust. We've never had a non burner break a head bolt. It's something about the burning of oil that welds the threads to the block. 2 Share this post Link to post Share on other sites
Sparky-(Admin) 23,166 #2 Posted May 3, 2019 I can’t answer your question but I’ve done a few head gasket and that same bolt is the one that has broken off on a few of mine. The latest was a 1981 vintage K321 that was not an oil burner and the other a 1968 vintage K181 that was an oil burner. So I attributed the same bolt snapping on two diff motors to years and years of exhaust heat. 1 Share this post Link to post Share on other sites
RetroMower 349 #3 Posted May 3, 2019 I had the exact problem with my k241. It burned oil quite well and the two bolts straddling the exhaust snapped and had to be drilled out Share this post Link to post Share on other sites
Mudrig150 331 #4 Posted May 3, 2019 Always these 2 bolts. Share this post Link to post Share on other sites
