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?

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.

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.

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.

proper bolt torque on Farmall Cub
 

proper bolt torque on Farmall Cub
 

On 20 Jul 2004 07:32:01 -0700, (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?

I won't claim to know this specific application, but the 35 ft/lb
sounds high for a 5/16, when you consider that our torque specs for a
3/8"-16 were 35 -42 ft/lb, grade 8 bolt.

However,

We had some torque specs in certain applications that seemed much
higher than one would expect, and the auditors could be quite picky
about them. As far as I can remember, the only 5/16 bolts we had were
the oilpan on the engines, and they were somewhere in the 14 -18 ft/lb
range. (With a note to be retorqued after enine test, something that
I never remember seeing done. The pan gaskets compresssed and the
torques would go down below 10 ft/lb, but never seemed to come out on
their own.)

Lennie the Lurker

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?

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?

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.

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?

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?

proper bolt torque on Farmall Cub
 

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
==================================================

proper bolt torque on Farmall Cub
 

This is not in the gear case. It is outside of the gear case.

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.

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.