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Exhaust manifold bolts torque |
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John Pirrung 
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Joined: March-31-2010 Location: FT. Wayne, Ind. Status: Offline Points: 11 |
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 Topic: Exhaust manifold bolts torquePosted: October-24-2014 at 11:05pm |
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Put a new exhaust manifold gasket on my 86 SN 351 PCM. What is the torque specs for the bolts? I do know it is a good idea to tighten them from the center on out. Thanks!
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John Pirrung
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Orlando76
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Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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Posted: October-24-2014 at 11:26pm |
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I don't know but I'd guess 20 and you'll be safe.
Got your anti seize? |
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John Pirrung
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Joined: March-31-2010 Location: FT. Wayne, Ind. Status: Offline Points: 11 |
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Posted: October-24-2014 at 11:58pm |
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Yes I do have anti seize, thanks for the info.
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John Pirrung
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Frankenotter
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Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072 |
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Posted: October-25-2014 at 12:39am |
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1999 Ski Nautique 196
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: October-25-2014 at 12:43am |
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John,
To be sure, I just looked at my machinists handbook. 20 may be on the high side considering the lube (anti seize) and a couple ft. lbs. high if you are using stainless. I'd shoot for 18 to 19. The link above is the chart for dry (no lube) threads. |
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BuffaloBFN
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Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Posted: October-26-2014 at 9:56am |
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I ran a bottoming tap in those and rinsed with light oil. I've had good results with stainless, but it hasn't been 'left alone' for 10 years either. I'm also fortunate to have a real hardware store here. Not all bolts are created equally; even in the same class. Our big boxes don't carry American made HW. Also, a threaded stud(name Pete?) makes for a great 3rd hand. I use 2, but put 'em in the shallow bosses.
It hasn't been taken apart in a while... |
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Orlando76
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Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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Posted: October-26-2014 at 10:10am |
I had to re-read this because what I saw was you were calling Pete a stud. |
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BuffaloBFN
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Posted: October-26-2014 at 10:18am |
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Isn't he?
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8122pbrainard
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Posted: October-26-2014 at 10:23am |
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A stainless socket head cap screw will have a tensile of 70,000 ether in a 18-8 or 316 material. This tensile is between a grade 2 and a grade 5. Use the torque chart accordingly if you can't find a specific one for stainless.
A "stud"!  Well, maybe in my younger days but I was never "threaded"!
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John Pirrung
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Joined: March-31-2010 Location: FT. Wayne, Ind. Status: Offline Points: 11 |
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Posted: October-29-2014 at 12:18am |
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Thanks for all the help. Exhaust manifold gasket installed, new electric choke, fogged engine, new spark plugs,changed oil & filter, drained block,put in RV antifreeze, cleaned bilge,washed hull,started to wax.Have been busy the last few nights, trying to beat the weather. Calling for a low of 27 degrees Halloween night!!! Raw water pump leaking around the shaft, need to rebuild this winter.
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John Pirrung
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bufafiller
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Joined: October-31-2014 Location: Albany, NY Status: Offline Points: 3 |
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Posted: October-31-2014 at 11:53pm |
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Marco and Hassan are having a tour with their teacher David, and Hassan tips the guide a little too much…Tour Guide: If you found my words helpful and interesting, please feel free to leave a few cents or dollars. Thank you.Marco: How much did you tip him, Hassan?Hassan: I gave him a $100 bill.David: Really Hassan, that’s ridiculous! You can’t give someone a $100 tip!Hassan: I’m sorry my teacher. For me, money is rubbish; and what do you do with rubbish? You throw it away.Marco: If you’ve got any more of that sort of rubbish, Hassan, you can always throw it at me.Hassan: Not at you, Marco, you are my friend. |
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BuffaloBFN wrote: