Replacing the serpentine belt on my old truck turned into a two day job

The tensioner bolt was seized solid and I had to soak it in penetrating oil overnight. Ended up having to cut it off with a hacksaw after it rounded off. What's the best way to free up a stuck tensioner before it gets that bad?

3 comments

3 Comments

phoenixb661mo ago

Man, that whole situation sounds painfully familiar. I had a similar fight with an idler pulley on a Chevy 350 that was just a total nightmare. The real kicker was when the bolt finally broke free, it sheared clean off inside the block. That turned a simple belt swap into a full weekend of drilling and using an easy-out, which of course snapped too. Ended up having to pull the whole bracket off and take it to a machine shop. Sometimes those old bolts are just too far gone to save, no matter what you try first.

wendyc5319d ago

Yeah, the "easy-out snapping too" part is the real soul crusher. Been there, felt that little piece of metal give way and just wanted to throw the whole tool box. At that point, you know you're in for a long, bad time.

the_elizabeth1mo ago

My dad's old F-150 taught me to hit the tensioner bolt with a propane torch for a solid minute before trying to turn it. The quick heat expansion breaks the rust bond way better than just oil. Follow that with a few sharp raps from a hammer on the bolt head to shock it loose, then try your wrench. If it moves even a little, work it back and forth while adding more oil. That combo has saved me from a lot of rounded bolts.