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Crank pulley bolt (Timing belt replacement DIY)

Hi all,

I'm having a hard time tigthening the crank pulley bolt with the proper torque (about 130 pounds). A click-type torque wrench wouldn't work, since the crank turning while applying torque.

Under-torque may ruin crank sporacket and others. I heard horror stories about under-torque. There are not many terrible stories about over-torque. I can imagine that it may ruin the crank pulley bolt.

I have an electric impact wrench, which says it produces maximum 185 pounds torque. A cheap one at Wal-mart, but it works fine.

I ran the impact wrench on the bolt until I heard "Clang" sounds coming from the engine case. Which could be a sign that tells "hey it is over-torqued".

What kind of risk I'm running here? Any ideas?

Should I buy an impact wrench extension socket or something?

Thanks, Jae

Reply to
sonata owner
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Oops, it is Sonata 99 V6. The crank pulley has only one big bolt.

Reply to
sonata owner

That's not a terribly powerful impact, so you're probably fine as far as tightening the bolt with it. I suspect you'd have a hard time finding a professional who doesn't tighten these bolts with an impact. The difference is that you probably don't have the experience to be able to use reasonable judgment with an impact on a crank pulley bolt.

A clanking from the engine case disturbs me, however. I'd expect the whack-whack from the impact wrench, but no noise from the engine case itself. Make sure you've got everything installed properly and that the engine turns all the way around (two crank turns) by hand.

Reply to
hyundaitech

Thank you much. That helps.

Reply to
sonata owner

Related topic: I managed to break the crank pulley bolt free without using an impact wrench for a DIY timing belt change. Here's how I did it for any other brave DIY's:

- Jack the car up with a stand on the passenger side

- pull the fuel pump fuse

- start the car and run it until the fuel pressure drops enough so that it stalls (it will stall after 5-10s)

- use a 1/2" drive johnson bar with crank bolt socket and enough extensions to clear the wheel well (you'll need about 18" long of 1/2" drive extensions to clear the wheel well). Use a jackstand to support the free end of the extensions+ johnson bar

- put a long pipe on the end of the johnson bar so that the pipe touches the ground in front of the car. The pipe will react the starter motor torque. Note the crank pulley rotates clockwise when viewed from the end (from passenger side of vehicle).

- get an assistant to crank the starter (briefly). The starter easily has enough torque to break the crank bolt loose.

I imagine there might be a risk of breaking a tooth off the ring gear or the starter motor pinon, but it worked for me!

Reply to
Lakeport88

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