The Ford Barn

TommyCoupe · 06-22-2015, 01:34 PM

I just bought a new Exhaust manifold and am ready to install it. Because the intake and exhaust manifold share the same studs/nuts, I expected that the thickness of the lugs on both parts would be the same.

If I measure the thicknesses of both, the intake is (at worst case) .012 thinner than the exhaust manifold.

Is .012 "close enough" or can it be shimmed on the nut side to make up for the offset ?

Tommy-

Mitch//pa · 06-22-2015, 01:46 PM

the cup shaped special washers go under the nuts and against the mainfolds. the washers will make up for that distance... put the washer on with the dome facing the nut

since you only purchased one new manifold make sure you get them surfaced

hangarb7 · 06-22-2015, 03:08 PM

Mitch, don't you mean the curved side faces the manifold lugs? That is the way the Snyders drawing shows it that came with my exhaust manifold.

I used my old intake but it had rust build up on the flat mating surface that goes against the exhaust manifold. Be sure all that is cleaned off. I wire brushed it, then carefully flat filed the bumps off.

THEN you make sure the surfaces that face the block are in the same plane...and if not then bolt them together and get them faced off at a machine shop as a unit.

This time BTW, I used the two individual gaskets rather than the long one piece gasket and it seems to be working pretty well.

JackD

CarlG · 06-22-2015, 03:34 PM

This is what Snyder's shows: (I think you are both saying the same thing, just using different words.)

Cape Codder · 06-22-2015, 03:54 PM

And what torque do you use on the nuts?

CarlG · 06-22-2015, 04:13 PM

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Just till they are tight. Les Andrews torque values are way too much.

Mitch//pa · 06-22-2015, 04:17 PM

yea MON

dish up
dish down

TommyCoupe · 06-22-2015, 06:57 PM

Seems to me that if the surfaces on both manifolds are flat and smooth on the side that matches up to block, and you torqued the manifolds down using the cupped washers and nuts, that they would seal tightly against the block. Then bolt the 2 manifolds together.

Does that make sense, or am I missing something ?

Tommy-

Tom Wesenberg · 06-22-2015, 08:03 PM

Quote:

Originally Posted by TommyCoupe

Seems to me that if the surfaces on both manifolds are flat and smooth on the side that matches up to block, and you torqued the manifolds down using the cupped washers and nuts, that they would seal tightly against the block. Then bolt the 2 manifolds together.

Does that make sense, or am I missing something ?

Tommy-

Sounds good as long as the manifolds fit nice where the 2 bolts clamp them together.

Brentwood Bob · 06-22-2015, 09:43 PM

Judgement on the tightness, but check for a few heat cycles to snug the nuts down.
You are correct that the last bolts tightened are the 2 that bolt the 2 manifolds together.
Careful not to strip, or snap those small bolts. Probably would not hurt to chase the threads first on the exhaust manifold.
Bob

TommyCoupe · 06-23-2015, 07:14 AM

Thanks for your advice guys.

Tommy-

BILL WILLIAMSON · 06-23-2015, 01:40 PM

For PO' folks that can't afford both NEW manifolds: IF, the "lugs" on one of the manifolds are CONSIDERABLY higher than on the other manifold, just carefully grind a "cut out" on the concave edge of the washer, mark it on the outside of the washer with a marking pen. THEN, carefully position the cut out over the HIGHEST mounting lug. CAREFULLY position the cut out, as you run the nuts down with your fingers, so the cut out remains in the correct place. THEN, tighten them down NORMALLY.
Bill W.

06-22-2015, 01:34 PM	#1
TommyCoupe Senior Member Join Date: Nov 2011 Location: Connecticut Posts: 204	Intake/Exhaust Manifold lug thickness I just bought a new Exhaust manifold and am ready to install it. Because the intake and exhaust manifold share the same studs/nuts, I expected that the thickness of the lugs on both parts would be the same. If I measure the thicknesses of both, the intake is (at worst case) .012 thinner than the exhaust manifold. Is .012 "close enough" or can it be shimmed on the nut side to make up for the offset ? Tommy-

06-22-2015, 01:46 PM	#2
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Intake/Exhaust Manifold lug thickness the cup shaped special washers go under the nuts and against the mainfolds. the washers will make up for that distance... put the washer on with the dome facing the nut since you only purchased one new manifold make sure you get them surfaced

06-22-2015, 03:08 PM	#3
hangarb7 Senior Member Join Date: May 2014 Location: North Versailles, PA Posts: 148	Re: Intake/Exhaust Manifold lug thickness Mitch, don't you mean the curved side faces the manifold lugs? That is the way the Snyders drawing shows it that came with my exhaust manifold. I used my old intake but it had rust build up on the flat mating surface that goes against the exhaust manifold. Be sure all that is cleaned off. I wire brushed it, then carefully flat filed the bumps off. THEN you make sure the surfaces that face the block are in the same plane...and if not then bolt them together and get them faced off at a machine shop as a unit. This time BTW, I used the two individual gaskets rather than the long one piece gasket and it seems to be working pretty well. JackD

06-22-2015, 03:54 PM	#5
Cape Codder Senior Member Join Date: May 2010 Posts: 1,337	Re: Intake/Exhaust Manifold lug thickness And what torque do you use on the nuts?

06-22-2015, 04:13 PM	#6
CarlG Senior Member Join Date: Nov 2010 Location: Anchorage, Alaska Posts: 9,192	Re: Intake/Exhaust Manifold lug thickness Sponsored Links (Register now to hide all advertisements) Just till they are tight. Les Andrews torque values are way too much. __________________ Alaskan A's Antique Auto Mushers of Alaska Model A Ford Club of America Model A Restorers Club Antique Automobile Club of America Mullins Owner's Club

06-22-2015, 04:17 PM	#7
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Intake/Exhaust Manifold lug thickness yea MON dish up dish down

06-22-2015, 06:57 PM	#8
TommyCoupe Senior Member Join Date: Nov 2011 Location: Connecticut Posts: 204	Re: Intake/Exhaust Manifold lug thickness Seems to me that if the surfaces on both manifolds are flat and smooth on the side that matches up to block, and you torqued the manifolds down using the cupped washers and nuts, that they would seal tightly against the block. Then bolt the 2 manifolds together. Does that make sense, or am I missing something ? Tommy-

06-22-2015, 09:43 PM	#10
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,420	Re: Intake/Exhaust Manifold lug thickness Judgement on the tightness, but check for a few heat cycles to snug the nuts down. You are correct that the last bolts tightened are the 2 that bolt the 2 manifolds together. Careful not to strip, or snap those small bolts. Probably would not hurt to chase the threads first on the exhaust manifold. Bob

06-23-2015, 07:14 AM	#11
TommyCoupe Senior Member Join Date: Nov 2011 Location: Connecticut Posts: 204	Re: Intake/Exhaust Manifold lug thickness Thanks for your advice guys. Tommy-

06-23-2015, 01:40 PM	#12
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: Intake/Exhaust Manifold lug thickness For PO' folks that can't afford both NEW manifolds: IF, the "lugs" on one of the manifolds are CONSIDERABLY higher than on the other manifold, just carefully grind a "cut out" on the concave edge of the washer, mark it on the outside of the washer with a marking pen. THEN, carefully position the cut out over the HIGHEST mounting lug. CAREFULLY position the cut out, as you run the nuts down with your fingers, so the cut out remains in the correct place. THEN, tighten them down NORMALLY. Bill W. __________________ "THE ASSISTANT GURU OF STUFF"