badly leaking intake manifold
Fleet Mechanic
Joined: Sep 2014
Posts: 1,626
Likes: 78
From: NE Texas
quick suggestion, providing more info on the year etc. of your truck/engine will allow the knowledgeable folks to help you better? The only gaskets I have looked at have been for combined intake/exhaust on a carbureted engine... depending on what you have others can advise you better than I.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Hello Tommy,
The short answer is no, you can't. On the 300, the intake and exhaust manifolds share the same bolts. Each bolt has an intake mounting ear and an exhaust mounting ear underneath it.
You can kinda see it in this pic with the washers across the top.
You will need to remove all of the bolts to remove the intake.
Secondly, as HoustonDave said, the year of your truck will also dictate a few other things such as whether or not you need to remove the exhaust manifold to get the intake out. If it's carbureted, then yes. The intake and exhaust are bolted together and will need to be separated. If it's EFI, then no.
Either way though. The intake/exhaust manifolds on the 300 share the same gasket, so you will need to move the exhaust back far enough to get a gasket underneath it.
Lastly, if your intake is leaking, it could also be warped. If that's the case, a new gasket won't fix it. You'll need to take it to a machine shop and have it planed back to flat. I would suggest doing this no matter what you do. If you're working on a carb'd engine, just take the whole intake/exhaust manifold combo out and have it planed as one piece.
The short answer is no, you can't. On the 300, the intake and exhaust manifolds share the same bolts. Each bolt has an intake mounting ear and an exhaust mounting ear underneath it.
You can kinda see it in this pic with the washers across the top.
You will need to remove all of the bolts to remove the intake.
Secondly, as HoustonDave said, the year of your truck will also dictate a few other things such as whether or not you need to remove the exhaust manifold to get the intake out. If it's carbureted, then yes. The intake and exhaust are bolted together and will need to be separated. If it's EFI, then no.
Either way though. The intake/exhaust manifolds on the 300 share the same gasket, so you will need to move the exhaust back far enough to get a gasket underneath it.
Lastly, if your intake is leaking, it could also be warped. If that's the case, a new gasket won't fix it. You'll need to take it to a machine shop and have it planed back to flat. I would suggest doing this no matter what you do. If you're working on a carb'd engine, just take the whole intake/exhaust manifold combo out and have it planed as one piece.
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
Lastly, if your intake is leaking, it could also be warped. If that's the case, a new gasket won't fix it. You'll need to take it to a machine shop and have it planed back to flat. I would suggest doing this no matter what you do. If you're working on a carb'd engine, just take the whole intake/exhaust manifold combo out and have it planed as one piece.
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New User
Joined: Feb 2017
Posts: 16
Likes: 0
badly leaking intake manifold
Thanks for the replies.
Good point- '79 f 150 300 cid w/a carb.
I have the intake studs out and I need a longer extension to remove the exhaust studs and the second exhaust down pipe stud.
Any other tips would be greatly appreciated.
Tommy
Good point- '79 f 150 300 cid w/a carb.
I have the intake studs out and I need a longer extension to remove the exhaust studs and the second exhaust down pipe stud.
Any other tips would be greatly appreciated.
Tommy
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
Here you can see the shared gaskets.
As you can see I am using studs as I was told they make life easier when trying to put everything back together.
Here you can just make out the washer/nut that hold both manifolds to the head.
Abandonedbronco got a question for you.
Have you ever needed to change the ALT and if so how did you get the long bolt out as it hits the front EFI manifold and can't be pulled out.
Also trying to get to the ALT bracket to block bolts could be he11 with the ALT in place.
Ask how I know and my fix.
Dave ----
As you can see I am using studs as I was told they make life easier when trying to put everything back together.
Here you can just make out the washer/nut that hold both manifolds to the head.
Abandonedbronco got a question for you.
Have you ever needed to change the ALT and if so how did you get the long bolt out as it hits the front EFI manifold and can't be pulled out.
Also trying to get to the ALT bracket to block bolts could be he11 with the ALT in place.
Ask how I know and my fix.
Dave ----
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Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Abandonedbronco got a question for you.
Have you ever needed to change the ALT and if so how did you get the long bolt out as it hits the front EFI manifold and can't be pulled out.
Also trying to get to the ALT bracket to block bolts could be he11 with the ALT in place.
Ask how I know and my fix.
Dave ----
I fixed it by drilling out the threads for the alternator bolt and replaced it with one that comes from the side of the radiator, and then put a big nut on the side with the exhaust. It works great.
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FTE Legend
Joined: Nov 2015
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From: Angier, NC
Haha, yes, been there, done that. Trying to hold that alternator up and out of the way while you're undoing the bracket to block bolts. You start to hate that alternator after a while.
I fixed it by drilling out the threads for the alternator bolt and replaced it with one that comes from the side of the radiator, and then put a big nut on the side with the exhaust. It works great.
I fixed it by drilling out the threads for the alternator bolt and replaced it with one that comes from the side of the radiator, and then put a big nut on the side with the exhaust. It works great.
Before fix
after fix -I drilled the bracket and used a Helicoil to thread the long bolt into to look stock.
Installed
Sorry for the hi jack but may help others if they do the EFI exh manifold swap as I never saw any posts on it.
Dave ----
FTE Legend
Joined: Nov 2015
Posts: 30,912
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From: Angier, NC
When the bolt runs in from the back like stock the hole is too big to thread it into.
Also the hole at the front with threads is too small so it needs to be drilled out for the bolt to pass thru it.
Easy way is as AB did and just drill out the front hole so the a longer bolt will pass thru and use a nut on it.
I just want it to look stock with out a nut and why I did it my way.
I have been known to take the hard road. I wanted factory AC in my 81 F100 non-AC truck so swapped the AC firewall into it.
Dave ----
Also the hole at the front with threads is too small so it needs to be drilled out for the bolt to pass thru it.
Easy way is as AB did and just drill out the front hole so the a longer bolt will pass thru and use a nut on it.
I just want it to look stock with out a nut and why I did it my way.
I have been known to take the hard road. I wanted factory AC in my 81 F100 non-AC truck so swapped the AC firewall into it.
Dave ----
Fleet Mechanic
Joined: Sep 2014
Posts: 1,626
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From: NE Texas
I am getting ready to do the EFI manifold swap and thought as long as I was in the vicinity I would change to the bolt-from the front set-up, so I would mainly be threading the rear hole and drilling the front one out. I have drill bits and taps to 1/2", so 'the thought occurred'.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
I am getting ready to do the EFI manifold swap and thought as long as I was in the vicinity I would change to the bolt-from the front set-up, so I would mainly be threading the rear hole and drilling the front one out. I have drill bits and taps to 1/2", so 'the thought occurred'.
That is why I used the helicoil to make the hole thread size for the bolt.
The easy way is what AB did, drill out the front hole so the bolt will pass thru, get a longer bolt and nut, run the bolt in from the front and nut on the back side.
As I said I like doing things the hard way
Dave ----
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