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| | | | Joined: Feb 2014 Posts: 75 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 75 | Am in the process of installing exhaust/intake manifolds on a 3100 216 engine. Is there a certain sequence to tighten the bolts and what is the recommended torque setting? Any particular do's or don'ts?
'53 3100 Short Bed
Texas Peace Officer - supporter of the Badge and the Blue Line
Pain is part of life, Misery is an option.
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | 5ptstar, First, lay the mating surface of the manifold assembly on a flat surface. If it lays flat on the surface (no significant "air gaps"), you have a high probability for a good seal. If it has gaps, you could try two sets of gaskets, or take the assembly to a machine shop to have the assembled mating surface planed ($50 job, probably). Here are torque specs for later 235/261 engines - they should be OK for the older 216/235 engines. Maybe someone has a link to the specs for a 216, or they can post a link to a Motor's Auto Repair Manual torque-specs page? I tighten from inside bolts outwards - by feel (no torque wrench). If I could get a torque wrench in there, I would use 30 ft-lbs as max for all bolts and tighten in this sequence: 1/3 max spec (10), then again at 2/3 max spec (20), then finally at full/max spec (30). Please do not ask me how you torque the intake manifold to a different setting from the exhaust manifold. I look forward to reading how others do that. | | | | | Joined: May 2007 Posts: 289 Shop Shark | | Shop Shark Joined: May 2007 Posts: 289 | One don't is to not fully tighten the bolts that hold the two manifolds together until after they are mounted to the engine. They need to be able to "float" a little in order for the intake manifold to properly seat on the alignment rings.
Mike | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | 5ptstar,
Are your manifolds now apart or bolted together? | | | | | Joined: Feb 2014 Posts: 75 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 75 |
'53 3100 Short Bed
Texas Peace Officer - supporter of the Badge and the Blue Line
Pain is part of life, Misery is an option.
| | | | | Joined: Jul 2013 Posts: 160 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 160 | Ditto on Tims tightening sequence. I put mine on tonite and tightened the ends first and the manifold Assy did not sit flat on the head, there was a gap on the lower edges. I loosened and did it Tims way and it sit perfectly flat now.
On the torque specs , the shop manual has the exact opposit range
Center clamp bolts 15-20 ft lbs
End clamp bolts 25-30 ft lbs .
I say tighten until tight, you results may vary. | | | | | Joined: Feb 2014 Posts: 75 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 75 | Thanks, everyone. I have days-off coming up and plan to install the manifolds then.
'53 3100 Short Bed
Texas Peace Officer - supporter of the Badge and the Blue Line
Pain is part of life, Misery is an option.
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