Thought I was too smart for torque wrenches, got humbled real fast

Been turning wrenches for about 7 years now and always thought I could feel when a bolt was tight enough. Last month I did head gaskets on a buddy's 2003 Civic and just snugged everything down by hand. 400 miles later it started leaking coolant from the head bolts. Had to pull it all apart, retap some holes, and buy a proper torque wrench. That $120 tool just saved me a weekend of rework and a new gasket set. Anyone else learn this lesson the hard way or am I the only dummy who trusted their arm?

2 comments

2 Comments

grant90118d agoTop Commenter

I've been doing this stuff for like 15 years and I'm not totally sold that a torque wrench is always the answer. Yeah, head bolts on a Honda are pretty picky, but I've done plenty of engine work with just a beam-style wrench and a good feel. Your buddy's Civic had aluminum threads in the block, right? That's a different animal than old cast iron where you can just snug it down and send it. I'm not saying torque wrenches are useless, but I think a lot of guys treat them like magic and ignore the actual condition of the threads and the bolt stretch.

logan_dixon1817d ago

Have you ever seen what happens when somebody puts too much faith in a click-type wrench on dirty threads? My buddy Jake was doing the head gaskets on his old Ford truck, cast iron block, nothing fancy. He torqued everything to spec on the first pass but didn't chase the threads or clean the bolt holes out. Two hundred miles later, one of the bolts backed out and it blew the gasket again. He was so sure the torque wrench made it bulletproof but the crud in the threads messed with the stretch.