On my Volvo 240 DL, I am trying to replace the fan clutch. I got two bolts off, but two others will not come off..it even broke the open end of my wrench. My Volvo mechanic told me to use a Flank Drive wrench 6.10 mm using the box end. This wrench grips the flat of the bolts instead of the points. But I am having trouble finding one for sale. Does anyone know where I can get this tool?

 

Flank Drive is a Snap-On product:

http://buy1.snapon.com/catalog/tools...e=snapon-store

(not cheap)

 

No, not the snap on tool line name. I read where that is not a true flank wrench but just the name of their line.

 

It's a relief in the corners of the wrench so it makes contact with the edges and not the points of the nut or bolt. craftsman has them also.

make your own. dremel little reliefs on your wrenches.

 

I called Sears and the guy said he didn't have anything like that. Can you tell me model or give me the link that your talking about, please? I would really like to get this done tommorow if I can buy the wrench at Sears. The corners of bolts started to round a little so I don't have to many chances left.

 

Something like this. http://www.craftsman.com/shc/s/p_101...&blockType=L17

If you go to sears and check out the combination wrenches. You should see the small radius in the corners of the boxed ends. Use the boxed end. Get a 6 point version. I use 12 points and haven't had a porblem.

Another option is this http://www.skhandtool.com/Default.as...e=10&pid=88514

What are you using now?

 

I used a 10 mm regular flat wrench and it broke on the bolt.

I don't think the above links are are the wrenches that works on the flat of the bolts though. Because I am supposed to get a 6.10 mm one that is suitable for a 10mm regular bolt.

 

My feeble brain tells me that there is no such thing as a fixed wrench/socket that will drive the flats of a bolt. The only way that would occur is if the wrench/socket was exactly the same size as the bolt - but that's would essentially make it a press-fit onto the bolt - not very practical. Since the opening of the wrench/socket must be larger than the bolt you only get a line of contact between the wrench/socket and the bolt. The so called "flank drive" just moves this line of contact away from the (weaker) points of the bolt and puts the line of contact onto a stronger section of the flats.

This link shows the Snap-on flank drive: http://machinedesign.com/content/con...-12-point-1103

 

can you heat the bolt with a torch? heat usually helps. sometimes if you try to turn the bolt in the tighten direction, it will break loose and then you can back it out

 

man, this time i used pliers and i just can't get it off. i had the water pump replaced about 2 years ago. could this over tighten bolt be because of the guy who installed the water pump?

 

Sure could. All that has to come off to swap the pump. Those really aren't bolts, they're studs with nuts run down on them. Usually, soaking with PB Blaster overnight and judicious "cooking" w/ a propane torch does the trick. In an extreme case, I'd cut the nuts off or use a "nut buster" tool (no risque comments please) that breaks the nut. Even if the stud gets destroyed, there should be enough left after the pulley comes off to get it backed out.

 

Is it possible to use a dremel and cut the bolt off without messing up the thread?

If I have to cut off the bolt completely by cutting off the stud, how can I replace the stud?

 

Yes, a Dremel can be used carefully. After you've cut a deep groove in the nut use a cold chisel or screw driver and split the nut. The stud is just a bolt w/ no head. It has a shoulder in the middle. It screws into the water pump until it hits the shoulder. Try vice grips on the nut before you start cutting. If you ruin the stud they can be replaced. If you can't get it out, then it has to be drilled out or get a new water pump.

 

Is there a place on the internet that I can order the replacement bolts? What size are they? This is my only means of transportation so if I do get the bolt off I need to be prepared ahead of time.

 

Just pm me your mailing address; I'm sure I can scare a few up at the shop off some spare motors.

 

Sorry for the late reply! I just replied to the pm. Thank you!!!

-Darin

 

Did you get the nut off?

 

how about the old shade tree mechanic's trick, PB blaster for a couple of days then some vice grips? work it back and forth slowly>

 

That just sounds so.....wrong!