Loadingā¦
24
Unpopular opinion: Hand-tightening critical bolts is a recipe for disaster
I was doing a head gasket replacement on an older engine and got lazy with the manifold bolts. Thought a good crank with a ratchet was enough, no torque wrench. Sure enough, a week later the customer reported an exhaust leak and lost power. Had to pull everything apart again, felt like a total fool, lmao. Now I torque every single bolt to spec, even if it seems overkill. That one job cost me half a day of free labor to fix. Watching other mechanics skip this step makes my skin crawl. Save yourself the headache and just grab the torque wrench every time.
3 comments
Log in to join the discussion
Log In3 Comments
val_cooper397mo ago
You learn that lesson exactly once, don't you? Thinking "good and tight" is a valid torque spec. Those bolts just wait until you're feeling good about the job to start their little smoke show. Ever notice how they never fail in the shop, only after the car leaves? Makes you wonder if they talk to each other.
8
troy5647mo ago
Heard a mechanic say once that torque specs exist for a reason (obviously, but you know how it is). Your point about bolts waiting to fail until after the car leaves is spot on, @val_cooper39. I read somewhere that vibration and heat cycles on the road can loosen bolts that were just 'good and tight'. It's like they need that real-world stress to show their weakness. Makes you respect the engineers who set those torque numbers, even if it means digging out the torque wrench every time.
10
thomas8627mo ago
Right? And @troy564 is onto something with the vibration thing. I had a wheel bearing bolt do the exact same quiet shop to roadside firework routine. It really does feel like a conspiracy.
1