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Restoration & Repair Tips Board

torque wrench and crows feet

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mark from the f

03-01-2007 14:05:47




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On the heads of Ferguson 35's, the specs are 70-75 ft/lbs per. On the spark plug side, I find it only possible to tighten using a crows foot wrench. My question is this, with the off set of a crow foot wrench, wouldn't that introduce a " leverage" component into the mechanics of tightening and change the amount of ft/lbs being put onto the bolt? My concern would be that overtightening is potentially dangerous for ANY head, the bolts are located on the edge (and a thin edge at that) of the head and wondered of there would be a risk of breaking or warping. My physics in college were basically how much force is required for a 16" forearm to lift a 12 oz. beer 20" to my mouth. Seriously, though, just wondering if this would be important to ALL the good people out there who like to scrape grease out from under their fingernail. God Bless, Mark

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jdemaris

03-02-2007 13:33:10




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 Re: torque wrench and crows feet in reply to mark from the fort, 03-01-2007 14:05:47  
It certainly makes things easier if you have - or make - the proper specialty wrenchs such as George MD posted.
But - there are conversion charts around for using offset wrenchs e.g crows feet with torque-wrenches. We has severval off-set Deere service tools that required using the torque-conversion charts.



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george md

03-02-2007 14:51:47




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 Re: torque wrench and crows feet in reply to jdemaris, 03-02-2007 13:33:10  

I have some of those tools that need the charts,
but didn'tthink he needed the confusion that goes
with using them. I made one of those in the picture and some others because they are no longer available. 11/16 & 13/16 can still be gotten but 7/8 is no more . I need 7/8 for the J series cont'ls so I made it out of broken and junk tools.

george



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jdemaris

03-03-2007 07:27:54




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 Re: torque wrench and crows feet in reply to george md, 03-02-2007 14:51:47  
Yes, I've got piles of tools I made that look similiar. Wasn't so free to do it though when I was working at a Deere dealership on a time-clock.
Every second of the day was accounted for and charged to someone or something - otherwise I didn't get paid. Thus the reason why we often did things at called-for by Deere. Not so, in my own shop. I will say - that 30-40 years ago - I didn't have a lot of "cheap" tools I was willing to cut up, bend, weld, etc. Now - with all the Chinese el-cheapo tools - I'm much more inclined to to do. In fact, there's a special tool I want right now - but OTC wants around $60 - $70 for it. I've been thinking a machining a fifty-cent Chinese deep-well 5/8 socket instead. Here's the OTC "specialty" injection wrench.

third party image

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george md

03-01-2007 15:59:56




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 Re: torque wrench and crows feet in reply to mark from the fort, 03-01-2007 14:05:47  
third party imageLink loading="auto" style="width:auto;height:auto">">Link

Mark ,

A crows foot is not what you need , the proper

tool is called a cylinder head wrench.

A picture for you.

george



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mark from the fort

03-01-2007 18:50:49




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 Re: torque wrench and crows feet in reply to george md, 03-01-2007 15:59:56  
Ah hah!
I never knew these was such a critter. It appears that the center of the drive opening is inline with the actual center of the wrench opening.
Now I feel really stupid--thanks alot fellas.
Now I know why there wasn't many others who asked this question--they already knew about this tool.
Thanks, that was fun.



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Jon Hagen

03-01-2007 15:42:58




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 Re: torque wrench and crows feet in reply to mark from the fort, 03-01-2007 14:05:47  
Wouldn't keeping the crow foot wrench at 90 degrees to the length of the torque wrench so your not extending it, maintain accuracy within a small percentage ?



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RickB

03-02-2007 16:18:31




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 Re: torque wrench and crows feet in reply to Jon Hagen, 03-01-2007 15:42:58  
That has been my solution. Don't tell 3 or 4 engines around here that is wrong; they won't understand.



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KIP in MX

03-01-2007 17:43:49




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 Re: torque wrench and crows feet in reply to Jon Hagen, 03-01-2007 15:42:58  
That�s what we do when clearance is a problem.



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