Manifold

JD 1931

JD 1931

Senior Member
I am going to install a new exhaust , intake manifold on my A and would like to know if 30 lbs of torque is enough? I know that t.l.c. is needed when installing. Going to use 2 new copper clad gaskets, with copper coat...thanks, J.D.
 
Suggest you do a search . This topic was discussed a couple of weeks ago . I just did this drill with some original manifolds ( intake and exhaust ) machined flat . . Used the copper gasket with holes not slots . Les Andrews book shows 45 ft-lbs which exceeded my comfort level . I started out with 25ft-lbs . Ran it for a while and then took it up to 35 ft-lbs. Ran some more and took it up to 40 ft-lbs . Holding at 40 ft-lbs . Exhaust and intake manifolds have to be flat as a unit.
 
I start at 25, let it sit cold awhile, take it to 30 and run it, then final to 35 cold. No probs so far. 45# seems a bit much to me, but opinions vary and different numbers have worked for others.
 
using the 2 piece copper gasket with holes for the bolts, maybe I will not use copper coat....Thanks
 
My $.02 would go like this, Have you had the manifolds apart? If so, make sure the gasket faces are flush. Lay a straight edge across the surface while looking for a gap or a rocking condition with illuminated backdrop, tiny amounts are tolerable, large gaps will cause either a leak or possible damage. If there is too much irregularity, then they should be assembled and the gasket surfaces should be ground level.
I believe that Mitch is correct. The manifolds were just tightened without torque wrenches. Of course there is nothing wrong with using a torque wrench to the settings suggested, but it is not necessary.
Terry
 
I'm going with Mitch's comment.
When in doubt and you need to get the job done snug them up firm being mindful of the fastener size.
OK that's nice and tight. Put the box end on the fastener and slap the wrench.
I do not know why I think this works but it has never failed me.
Think of it like cinching a knot. The wrench will move just a little bit and will "cinch" the nut.
if you hurt your hand you went to far.
Do not try this at home...<g>
 
I'd bolt the intake and exhaust manifolds together and have the assembly surfaced. One set of gaskets will be enough. No Copper Coat necessary.
 
No Coppercoat. It will be a problem when you get to disassembly(someday). Resurface the manifolds, make sure you've got the washers on right, and tighten till the nuts feel snug. Run it a while, let it warm up, then snug again. I don't take a reading on them, but it feels like about 40#. I tighten from the inside out to the ends.
 
I just installed a new copper gasket and torqued to 25 cold, ran it for a few miles and went to 35. A day later I ran it for about 5 miles and checked the torque while hot. It was still at 35 and that's where I left it. W
ill check it again this weekend, but I'm staying at 35. That seems to be the most common number after searching this forum on the subject.
 
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