300-6 Exhaust Manifold Gasket---Should one be used ???
#1
300-6 Exhaust Manifold Gasket---Should one be used ???
Howdy,
When I replaced exhaust manifold last year on my
300-6, I used a name-brand gasket. I now have some
small exhaust leaks which I can hear. Ford originally used
no gasket, and some recommend this. I have a '79 engine
with used manifold from '83---do you think I'd have problem
if I removed gasket ? Do they seal well without ?
Thanks. J.R.
When I replaced exhaust manifold last year on my
300-6, I used a name-brand gasket. I now have some
small exhaust leaks which I can hear. Ford originally used
no gasket, and some recommend this. I have a '79 engine
with used manifold from '83---do you think I'd have problem
if I removed gasket ? Do they seal well without ?
Thanks. J.R.
#2
300-6 Exhaust Manifold Gasket---Should one be used ???
As cast iron parts are heated and cooled they don't seal very well, they have a tendency to warp. 300 I6 exhaust and intake manifolds warp easily if they are not torqued down properly. I start on the inside bolts and work outward in a staggered pattern. I had similar problems with my 84s manifolds leaking, the best fix for it is to install two gaskets doubled up. I did mine over two years ago and haven't had a problem since.
#3
300-6 Exhaust Manifold Gasket---Should one be used ???
Thanks---I did torque bolts according to factory manual,
but used one gasket set. Have heard of doubling gaskets, but
was concerned about durability. Do you use regular donut
gasket or sintered metal ? I used the metal thinking it might
seal better & last longer. Or does the '84 even use the flange
gasket ? Just remembered the newer manifolds changed
design... What brand gaskets do you use ? Think mine is
Fel-pro. J.R.
but used one gasket set. Have heard of doubling gaskets, but
was concerned about durability. Do you use regular donut
gasket or sintered metal ? I used the metal thinking it might
seal better & last longer. Or does the '84 even use the flange
gasket ? Just remembered the newer manifolds changed
design... What brand gaskets do you use ? Think mine is
Fel-pro. J.R.
#4
300-6 Exhaust Manifold Gasket---Should one be used ???
I'm in the same boat. Did mine a year ago, had both manifolds machined together. The intake sealed horribly with just the single piece (I removed the stapled intake one). I put the two piece set back on and one year later I have a minor exhaust leak. I blame myself for not retorquing the bolts shortly afterwards...or maybe my head is bowing that much. I'm doing the gasket job tomorrow...always easier the second time. My exhaust pipe is far from perfectly circular, the metal and sintered metal dougnuts are too rigid to fit my obround exuast pipe. The blue one is crap, I usually buy the shiney composite one. I have terrible sealing problems with those dougnuts... when I start plans on the aftermarket exhaust system for my truck I'll have to ensure there isn't a lot of stress at the union - I suspect the root cause of my dougnut problem. I'm not sure if you have a "Carquest" around, but the shiney is PN F17250
#5
300-6 Exhaust Manifold Gasket---Should one be used ???
Oh I thought you were talking about where the manifold meets the head, maybe you were but that is the best fix for that problem. As for the down pipe from the manifold, mine does not use a donut gasket. I think I would use the sintered metal donut I would think it would be softer and would probably seal better.
#6
300-6 Exhaust Manifold Gasket---Should one be used ???
Hey Pkupman---yes, was talking about exhaust manifold
originally. Just wanted opinion on doughnut, also---didn't
think yours used one... Thanks for info. Wonder how many
others have doubled gaskets. Did you use both intake gaskets
also, or just 2 exhaust with one intake ??? Good luck
Tetraruby with your leakage---let us know how it turns out.
Thanks again. J.R.
originally. Just wanted opinion on doughnut, also---didn't
think yours used one... Thanks for info. Wonder how many
others have doubled gaskets. Did you use both intake gaskets
also, or just 2 exhaust with one intake ??? Good luck
Tetraruby with your leakage---let us know how it turns out.
Thanks again. J.R.
#7
Trending Topics
#8
300-6 Exhaust Manifold Gasket---Should one be used ???
I used double gaskets on both manifolds. An old timer engine builder told me the best way to install the manifold gaskets is to loosen the bolts that hold the two manifolds together, bolt the manifolds to the block, torque them down, then torque down the bolts that hold the manifolds together. Do it this way and you should have NO problems with intake or exhaust leaks for a very long time.
#9
#10
#11
Doubling Up
This last Spring, had intake/out take manifolds ALMOST out. Couldn't get to that dad gum blot hidden behind the carb mt. 79 300 Inline 6. Left it to someone who said they knew…..Have metal type gasget in there now, but leaking, sounds horrible. Put on new 1 brl Carb, not sure had anything to do with….Really annoyed with same 'helper', who mixed up Alternator lines…*why take alter. out?*
Least I know now to have TWO gaskets on hand. As someone said, Should be easier the 2nd time and without the 'Jeep' helper…..Gggrrrrr
Now where did I put that 2x4 again? Nah, time to cut wood, will MAKE what is NEEDED for helpers!!
Least I know now to have TWO gaskets on hand. As someone said, Should be easier the 2nd time and without the 'Jeep' helper…..Gggrrrrr
Now where did I put that 2x4 again? Nah, time to cut wood, will MAKE what is NEEDED for helpers!!
#14
Thx for info
Yeah, they are a BIT more. Fall coming fast around here so will put off but save pg for spring, when firewood done. Going to look around for better gaskets also. Good point/option. Not like there aren't other things the old girl needs to have worked on! Thanks for the help, suggestions, yada, yada.
Oh, off topic, but with new carb got 11.4 MPG Pretty damn good for 300 I6 F150, right?
Tinker~
Oh, off topic, but with new carb got 11.4 MPG Pretty damn good for 300 I6 F150, right?
Tinker~
#15
I would throw away the oem bolts (since they've been heated and cooled a million times not) and use grade 8 studs, 3/8" 18 thread into the head with copper anti seize compound on threads, and 3/8" 24 thread with a high quality crimp nut on that. I use the mr.Gasket 260, and three years later have zero problems. BUT, I installed by torquing to half torque first, working in an counter-clockwise spiral from center out, went back and torques in same fashion to full spec. After engine is run to full heat, let it cool completely and retorque, and repeat one more time and forget about it.
The gasket in the link looks super. I think the Mr. Gasket 260 costs $25 alone. For $20 more I'd certainly try that gasket.
The gasket in the link looks super. I think the Mr. Gasket 260 costs $25 alone. For $20 more I'd certainly try that gasket.