Chainsaw Repair
How To Basics - Carb Fixes + Mods - IPL and Service Manuals => How To Basics and Fixes => Topic started by: eriksat1 on March 11, 2014, 04:41:17 pm
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How do you torque cylinder bolts?
I have a inch Lb torque wrench but don't have metric allen head sockets that long. I have been just using the long tee handle allen wrenches, and tighten about the same as it took to loosen them by hand feel. How do you do it?
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I do the same as you
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Me just by feel. Then recheck after some running and cool down cycles.
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Erik, I use a 3/8 metric torque wrench from Craftsman $19.00. I also use 3/8 drive long Allens from Harbor Freight (not ball end) cost you about $15 for everything you will need to work on a saw.
I do the usual criss cross pattern to get them to spec, then give each bolt in turn a sharp tap with a hammer on the socket end. Then recheck torque. I then do it again after some heat/cool cycles. If it is a HVA saw the spec on the jug bolts is 10nm (newton/meters). Muffler bolts are 14nm. 10nm is 88.5 inch pounds.
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Awesome. Looks like I will be adding a few new toys....er tools to the tool box!
Scott (don't need fancy, just good) B
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HF also sells short metric allens that I find are easier to use than the long ones when the bolts are exposed. The long ones when used in that situation are very easy to misalign and can mess the cap screws. I have a set of ball ends from HF but never use them in a torque situation.
They also sell a long T-27 Torx bit for the newer Stihls
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I've got two 1/4" drive torque wrenchs .A Wiha break over beam and a Snap-on dial type in both SAE and metric .In addition some "click" types you can set the torque with an allen wrench for the snap over .Those later ones were used to torque carbide inserts for high speed production metal cutting machinery .
The long shafted T-27 Torx head drivers are relatively inexpensive .The heads or driver end is 1/4",fits in a 1/4" socket .I think maybe 7-8 bucks flea bay .You can get long shafted hex drivers too if you look around .
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Al, I am very interested in the 1/4 inch Wiha torque wrenches you speak of. Can't seem to find them online. Please could you post the product number for yours?
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http://www.wihatools.com/200seri/285vario_s.htm
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Thanks Jim! nice tools, however I think I am going to one and buy an Armstrong, they have a 3/8 model that reads in NM 2-50 I think.
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I use the Armstrong method. Common sense tells me when it is the right tightness.
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I was in error it's a Facom model R.203DA 6-35 NM .I must have Wiha on the brain or something because a lot of our specialty tools at work are Wiha .I think Facom might be British ??
Kind of a neat torque wrench originally used for some gauge at work no longer used and discarded when the guage was obsoleted .I jumped on it like ugly on ape . ;D
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YEOW, Al, do you realize what that thing is worth? Depending on source any where from 260 to 1250$! No wonder you jumped on it!
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;D I knew it was top notch but I didn't know that costly .I looked them up on flea bay and they have two,100 and 150 respectfully .A couple of dial type Snap-ons about the same price .
Now because torque of threaded fasteners is part of my "day " job I'm a tad fussy about critical fasteners .In the case of chainsaws I list those as cylinder bolts and case bolts .The rest get the old armstrong method .Righty tighty ,lefty loosey .Tight is tight too tight is broke . ;)