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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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proper bolt torque on Farmall Cub
I have an old 49 Farmall Cub that I am fixing for my father. I
replaced the bearings in the transmission. The old manual I found online says the countershaft bearing retainer should be torqued to 35 ft lbs. The top clutch shaft retainer says to torque to 20 ft lbs. Before I new this I torqued both to 20 ft lbs because of a bolt size/torque diagram I found said this is the proper torque for a 5/16 bolt. Will I have problems? Why would there be different values? |
#2
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proper bolt torque on Farmall Cub
Subject: proper bolt torque on Farmall Cub
From: (Don) Date: 20/07/04 15:32 GMT Daylight Time Message-id: I have an old 49 Farmall Cub that I am fixing for my father. I replaced the bearings in the transmission. The old manual I found online says the countershaft bearing retainer should be torqued to 35 ft lbs. The top clutch shaft retainer says to torque to 20 ft lbs. Before I new this I torqued both to 20 ft lbs because of a bolt size/torque diagram I found said this is the proper torque for a 5/16 bolt. Will I have problems? Why would there be different values? The stronger the grade of steel a bolt is made from the higher the torque it can be done up to. 35 ft lbs is a bit steep for any grade of 5/16" bolt though. I've never seen anything that size in an ordinary engine needing more than high 20s ft lbs. A grade 12.9 high tensile metric 8mm would perhaps just stand that much torque but you don't usually find that high a grade except in aftermarket bolt sets for race engines. 30 to 35 ft lbs is about what I'd associate with a normal 9mm high tensile big end bolt (grade 10.9) and perhaps 24 to 28 ft lbs for an 8mm one. No point using a bolt chart if you don't know the grade of steel of the bolt and also the strength and thread length of the parent material it's screwing into. -- Dave Baker - Puma Race Engines (www.pumaracing.co.uk) Regione interior.....Scorchio Regione exterior....Scorchio Costa...................Scorchio Chalfont St Peter...Cumulo bloody nimbus as per usual. |
#3
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proper bolt torque on Farmall Cub
Here is an interesting chart listing torque values for Holochrome SHCS's,
which does call out 38 ft lbs for a 5/16" fastener. Seems very high to me, but there you go. I've recently started using Holochromes for engine assembly work on my race engines, since you can get them in a bright plated finish and they look stunning on a new race motor. I just ordered some, about 25 cents each for 5/16" by 3/4" which isn't cheap, but customers love a great looking motor, I find. I still use ARP for the critical fasteners. "Dave Baker" wrote in message ... Subject: proper bolt torque on Farmall Cub From: (Don) Date: 20/07/04 15:32 GMT Daylight Time Message-id: I have an old 49 Farmall Cub that I am fixing for my father. I replaced the bearings in the transmission. The old manual I found online says the countershaft bearing retainer should be torqued to 35 ft lbs. The top clutch shaft retainer says to torque to 20 ft lbs. Before I new this I torqued both to 20 ft lbs because of a bolt size/torque diagram I found said this is the proper torque for a 5/16 bolt. Will I have problems? Why would there be different values? The stronger the grade of steel a bolt is made from the higher the torque it can be done up to. 35 ft lbs is a bit steep for any grade of 5/16" bolt though. I've never seen anything that size in an ordinary engine needing more than high 20s ft lbs. A grade 12.9 high tensile metric 8mm would perhaps just stand that much torque but you don't usually find that high a grade except in aftermarket bolt sets for race engines. 30 to 35 ft lbs is about what I'd associate with a normal 9mm high tensile big end bolt (grade 10.9) and perhaps 24 to 28 ft lbs for an 8mm one. No point using a bolt chart if you don't know the grade of steel of the bolt and also the strength and thread length of the parent material it's screwing into. -- Dave Baker - Puma Race Engines (www.pumaracing.co.uk) Regione interior.....Scorchio Regione exterior....Scorchio Costa...................Scorchio Chalfont St Peter...Cumulo bloody nimbus as per usual. |
#4
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proper bolt torque on Farmall Cub
And here is the URL sorry: http://www.spaenaur.com/view_pdf.asp?Page=B211
"Brian" wrote in message ... Here is an interesting chart listing torque values for Holochrome SHCS's, which does call out 38 ft lbs for a 5/16" fastener. Seems very high to me, but there you go. I've recently started using Holochromes for engine assembly work on my race engines, since you can get them in a bright plated finish and they look stunning on a new race motor. I just ordered some, about 25 cents each for 5/16" by 3/4" which isn't cheap, but customers love a great looking motor, I find. I still use ARP for the critical fasteners. "Dave Baker" wrote in message ... Subject: proper bolt torque on Farmall Cub From: (Don) Date: 20/07/04 15:32 GMT Daylight Time Message-id: I have an old 49 Farmall Cub that I am fixing for my father. I replaced the bearings in the transmission. The old manual I found online says the countershaft bearing retainer should be torqued to 35 ft lbs. The top clutch shaft retainer says to torque to 20 ft lbs. Before I new this I torqued both to 20 ft lbs because of a bolt size/torque diagram I found said this is the proper torque for a 5/16 bolt. Will I have problems? Why would there be different values? The stronger the grade of steel a bolt is made from the higher the torque it can be done up to. 35 ft lbs is a bit steep for any grade of 5/16" bolt though. I've never seen anything that size in an ordinary engine needing more than high 20s ft lbs. A grade 12.9 high tensile metric 8mm would perhaps just stand that much torque but you don't usually find that high a grade except in aftermarket bolt sets for race engines. 30 to 35 ft lbs is about what I'd associate with a normal 9mm high tensile big end bolt (grade 10.9) and perhaps 24 to 28 ft lbs for an 8mm one. No point using a bolt chart if you don't know the grade of steel of the bolt and also the strength and thread length of the parent material it's screwing into. -- Dave Baker - Puma Race Engines (www.pumaracing.co.uk) Regione interior.....Scorchio Regione exterior....Scorchio Costa...................Scorchio Chalfont St Peter...Cumulo bloody nimbus as per usual. |
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proper bolt torque on Farmall Cub
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#7
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proper bolt torque on Farmall Cub
I am not sure what grade bolts were in there but I put grade 5 back
in. (new bolts) The threaded portion the bolts go into are in the transmisison casing itself which i assume is cast iron. I was more afraid of stipping those out than anything. Can I get by with 20 ft lbs? |
#8
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proper bolt torque on Farmall Cub
I recall that farm and industrial stuff often uses pretty good quality
fasteners. if a torque call-out of 35 ft/lbs is in the book, then a grade 5 bolt is not adequate. I would use L9 or Holochrome type SHCS in tension for that kind of requirement. If this is holding something on that you want to stay on, then you pretty much have to do it right. Brian "Don" wrote in message m... I am not sure what grade bolts were in there but I put grade 5 back in. (new bolts) The threaded portion the bolts go into are in the transmisison casing itself which i assume is cast iron. I was more afraid of stipping those out than anything. Can I get by with 20 ft lbs? |
#9
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proper bolt torque on Farmall Cub
Subject: proper bolt torque on Farmall Cub
From: (Don) Date: 21/07/04 13:29 GMT Daylight Time Message-id: I am not sure what grade bolts were in there but I put grade 5 back in. (new bolts) The threaded portion the bolts go into are in the transmisison casing itself which i assume is cast iron. I was more afraid of stipping those out than anything. Can I get by with 20 ft lbs? If you think you know more about the engine's design and requirements and bolt theory than the guy who designed the engine then by all means carry on. If you replace high tensile bolts with pieces of **** and do them up to half the required torque and it all falls apart don't be too surprised. -- Dave Baker - Puma Race Engines (www.pumaracing.co.uk) Regione interior.....Scorchio Regione exterior....Scorchio Costa...................Scorchio Chalfont St Peter...Cumulo bloody nimbus as per usual. |
#10
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proper bolt torque on Farmall Cub
I'd post the question over at
http://www.antiquetractors.com/ I have a hunch that the manual you are using refers to a 3/8" bolt that might have been used on a a different model. Don wrote: I have an old 49 Farmall Cub that I am fixing for my father. I replaced the bearings in the transmission. The old manual I found online says the countershaft bearing retainer should be torqued to 35 ft lbs. The top clutch shaft retainer says to torque to 20 ft lbs. Before I new this I torqued both to 20 ft lbs because of a bolt size/torque diagram I found said this is the proper torque for a 5/16 bolt. Will I have problems? Why would there be different values? |
#11
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proper bolt torque on Farmall Cub
BTW: for a good laugh, take a look at the section
http://www.tractorshed.com/cgi-bin/g...ouble_view.cgi RoyJ wrote: I'd post the question over at http://www.antiquetractors.com/ I have a hunch that the manual you are using refers to a 3/8" bolt that might have been used on a a different model. Don wrote: I have an old 49 Farmall Cub that I am fixing for my father. I replaced the bearings in the transmission. The old manual I found online says the countershaft bearing retainer should be torqued to 35 ft lbs. The top clutch shaft retainer says to torque to 20 ft lbs. Before I new this I torqued both to 20 ft lbs because of a bolt size/torque diagram I found said this is the proper torque for a 5/16 bolt. Will I have problems? Why would there be different values? |
#12
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proper bolt torque on Farmall Cub
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#13
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proper bolt torque on Farmall Cub
In article , Lennie the Lurker
says... .... I'd have to say that if he used a lock washer to prevent it backing off, torqued to the 20 ft/lb, it will probably last longer than what is going to be the next thing in the transmission to go, more than likely a bearing somewhere, or the teeth off a gear. Ahh. No. I would never advise using a split, or any other kind of, lockwasher inside a gearbox for any purpose. Safety wire, red locktite, yes. But not lockwashers. Jim ================================================== please reply to: JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com ================================================== |
#14
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proper bolt torque on Farmall Cub
This is not in the gear case. It is outside of the gear case.
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#15
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proper bolt torque on Farmall Cub
Subject: proper bolt torque on Farmall Cub
From: (Don) Date: 21/07/04 13:29 GMT Daylight Time Message-id: I am not sure what grade bolts were in there but I put grade 5 back in. (new bolts) The threaded portion the bolts go into are in the transmisison casing itself which i assume is cast iron. I was more afraid of stipping those out than anything. Can I get by with 20 ft lbs? If you think you know more about the engine's design and requirements and bolt theory than the guy who designed the engine then by all means carry on. If you replace high tensile bolts with pieces of **** and do them up to half the required torque and it all falls apart don't be too surprised. -- Dave Baker - Puma Race Engines (www.pumaracing.co.uk) Regione interior.....Scorchio Regione exterior....Scorchio Costa...................Scorchio Chalfont St Peter...Cumulo bloody nimbus as per usual. Then again, it's a 49 Farmall Cub tranny - not a hi-perf 454.... Ken. |
#16
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proper bolt torque on Farmall Cub
jim rozen wrote in message ...
Ahh. No. I would never advise using a split, or any other kind of, lockwasher inside a gearbox for any purpose. Safety wire, red locktite, yes. But not lockwashers. Ummm, JIm, When you've looked at some 40 transmissions a day, five days a week, for such things as split lockwashers, missing bolts, etc., for more than 12 years, perhaps I'd give you a little credibility on that. The favored retainers for bolts inside the transmissions were actually keepers, the kind you bend up to hold the head, second to that was the lockwasher recessed into a counterbore, last one was a star washer. Safety wire in most apps inside the gearbox is not cost effective, takes too much time fishing for the bolt head you can't see, and loctite requires parts free of oil. Parts free of oil are usually not free of rust in a very short time. |
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