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Jul 21st, 2025 | | | | Joined: Sep 2010 Posts: 49 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2010 Posts: 49 | How do you get the proper torque on the manifold of a 235. All I can get my bolts is a 9/16 box end wrench. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 |
Bill Burmeister
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | First, place your manifold assembly on a flat surface and make sure the mating surface is true/flat from end-to-end and side-to-side. If it is not flat, you need a machine ship to true the mating surface. Then, make sure the alignment rings are not going to prevent a tight fit.
I you do not have a crows foot adapter that works with your torque wrench in those locations, use your box-end wrench from the inside towards the outside:
snug all bolts
then, snugger all bolts
then, tighten all bolts
then, real tighten all bolts
| | | | | Joined: Dec 2015 Posts: 2,061 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,061 | If you use a crows-foot, remember that it will throw off your torque a bit because you are adding an inch or so to the overall length of your torque wrench. | | | | | Joined: Sep 2010 Posts: 49 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2010 Posts: 49 | If I use minimum torque value will that compensate by using the crows foot. | | | | | Joined: Dec 2015 Posts: 2,061 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,061 | would have to do the math. Depends on the length of the crowfoot and length of your torque wrench. You don't want it too loose and coming off! I would rather do it with a long handled box wrench without the torque wrench than use a crow foot but that is just my opinion. | | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | | | | | | Joined: Dec 2015 Posts: 2,061 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,061 | | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Larry, not saying we shouldn't torque the bolts but if the manifolds are flat and you use a good sequence tightening them a little each time until you get them tight, I think you will be OK. I hate to admit it but I have Never torqued the manifold bolts... I never had a torque wrench when I need it!!! | | | | | Joined: Sep 2010 Posts: 49 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2010 Posts: 49 | Thanks guys. I think I will do it like Mr. Lederman said,snug, snugger, tight, real tight | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Once all the slack is taken up so the manifolds are snugged up against the head, turn each bolt/nut one flat (1/6 turn) tighter. That's about as accurate as using a torque wrench. I use the same basic procedure when tightening wheel nuts if a torque wrench isn't available.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jan 2014 Posts: 3,504 'Bolter | | 'Bolter Joined: Jan 2014 Posts: 3,504 | First, place your manifold assembly on a flat surface and make sure the mating surface is true/flat from end-to-end and side-to-side. If it is not flat, you need a machine ship to true the mating surface. Then, make sure the alignment rings are not going to prevent a tight fit.
I you do not have a crows foot adapter that works with your torque wrench in those locations, use your box-end wrench from the inside towards the outside:
snug all bolts
then, snugger all bolts
then, tighten all bolts
then, real tighten all bolts But leave the intake-to-exhaust bolts/nuts loose while torqueing the manifolds to the head, correct? Larry asks a timely question. I need to bolt up my manifolds soon.
1951 3100
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Like my grandpa always used to say, "Tighten them up just before they start gettin' looser."
But then he also use to say, "Tighten it as tight as you can, plus 1/4 turn." (I still don't know how you're supposed to do that.)
Grandpa was quite the card, as they used to say.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | Only 20 ft lbs on the center bolts
30 ft lbs on the outer
Should be able to develop a "feel" for it
If not....mark a point of the hex of one you can get to with a socket and torque wrench. Torque it to 20 ft lbs.
see how much the point of the head turned form the mark.
Use that distance as a guide for the centers.
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