1986 5.0 Intake Manifold Removal

Greysen

New Member
Aug 5, 2006
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Hi guys, hopefully an easy tech question here.

I'm in the process of restoring my 86 5.0, and I'm having some difficulty getting the intake manifold removed off of it. It looks like there are 4 visable mounting bolts/nuts, all of which are currently removed.

My question is... there is also a coverplate on top of the manifold with the Ford logo and 5.0 jazz that is unfortunately corroded on (The 4 screws do -not- want to move.) Am I safe to commence prying to get the manifold off, or do I need to get this coverplate off and remove some hidden nuts as well? (I'm suspecting there is 1 or 2 in there.)
 
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tunedin302 said:
DO NOT PRY IT OFF!! Their are two bolts under that name plate that need to be removed.

Thanks, thats what I was suspecting just from looking at it. Going to try letting the coverplate screws soak in penetrating oil some more, but if that dosen't work they're going to unfortunately have to get drilled/tapped. :/
 
Greysen said:
Thanks, thats what I was suspecting just from looking at it. Going to try letting the coverplate screws soak in penetrating oil some more, but if that dosen't work they're going to unfortunately have to get drilled/tapped. :/

If that doesn't work then get yourself an easy-out
 
I think I'd have to get it to move to consider that. The heads on the aren't particularly stripped, they're just defeating my impact driver at the moment.

I'm pretty sure the problem comes from the corrosion between the plate and the manifold seperating the 2 just enough to pretty much permanently mount the screw in place. Hopefully if I do have to clip the head of the screw off, it won't be stuck in the upper manifold and I can just use some vice-grips to finish it off. Am I wrong in my thinking there?
 
Here's some tips...

Tools: a good torque wrench is a must have item. A razor blade scraper that holds a single edge razor blade from Home Depot or Ace hardware is another handy thing. Get a Chilton or Haynes shop manual - you'll need it for the bolt torques and patterns. The intake manifold has an especially odd pattern. You'll need access to a timing light to set the timing after you re-stab the distributor. Look in the A/C repair section for the fuel line tools. They look like little plastic top hats. You will need the 1/2" & 5/8" ones. The hat shaped section goes on facing the large part of the coupling. Then you press hard on the brim until it forces the sleeve into the coupling and releases the spring. You may need someone to pull on the line while you press on the coupling. Put some motor oil on them when you put the line back together.

The A/C Compressor comes off with lines still connected. Mark all the electrical, smog and vacuum lines with tags to help you remember where to re-connect them. If you have a digital camera, take several pictures.

Whatever you do, don't skimp on cleaning the gasket surfaces. New gaskets need to seat against bare metal and not the residue left from the old gaskets in order to seal leak free. This is the most time consuming and tiresome part of the job. Look for little things that need to be replaced like the short hose from the thermostat hosing to the water pump, damaged vacuum lines and hose clamps that are rusted or broken.

Plan on cutting the thermostat to water pump hose, or removing the thermostat housing. Also plan on removing the distributor to get clearance to remove the intake manifold. Remove #1 spark plug, stick your finger in the spark plug hole and crank. When your finger gets air moving past it, stop cranking. Turn the engine until the timing marks line up with the pointer. Now you can pull the distributor out.

My favorite trick that saves time and effort is the stay in place gasket. Be sure that you scrape (don't use a wire brush) all the old gasket material off, then clean all the surfaces with acetone or MEK.

When the surfaces are clean, use weather strip adhesive on the head to manifold surface, and on the side of the gasket that mates to the head. Follow the instructions on the tube or can and when it gets tacky, press the gasket down on the head.

Clean the area where the rubber rails mount to the block in front and in the rear with more acetone or MEK and do the same trick with the weather strip adhesive that you did to the heads.

Coat the rubber seals and the gasket area around the water passages with lots of Blue Silicone gasket sealer and put it together. Wala! no leaks, and no gaskets that shifted out of place.

Fuel injector seal kits with 2 O rings and a pintle cap (Borg-Warner P/N 274081) are available at Pep Boys auto parts. Cost is about $2.74 per kit. The pintle caps fit either injectors with a pin sticking out the injector end or 4 with more tiny holes in the injector end. The following are listed at the Borg-Warner site ( http://www.borg-warner.com ) as being resellers of Borg-Warner parts:

http://www.partsplus.com/ or http://www.autovalue.com/ or http://www.pepboys.com/ or http://www.federatedautoparts.com/

Most of the links above have store locators for find a store in your area.

Use motor oil on the O rings when you re-assemble them & everything will slide into place. The gasoline will wash away any excess oil that gets in the wrong places and it will burn up in the combustion chamber.

Consumable items:
Upper manifold gasket
Fel Pro 1250 or equal lower manifold gasket set.
Short formed hose between thermostat hosing and intake manifold
6 ft 7/64" or 1/8" vacuum hose
2 ft 1/2" heater hose
1 1/2 ft 5/8" heater hose
Blue Silicone sealer
ARP antiseize or equal for the bolts
4 each 3/4" hose clamps (spare item in case the old ones are bad)
4 each 1/2" hose clamps (spare item)
 
Thanks Jrichker, thats pretty much covers all of it I'd think. The upper/lower intake manifold seal is something I overlooked, so I'll have to get my hands on one of those tomorrow assuming I can get this bloody coverplate off.

I'll be a bit more consise as to what I'm doing next time, as I'd have saved you a lot of typing if I had mentioned I was just pulling the upper manifold to get the valve covers off. :/
 
The manifold R&R tips is from a tech note that I have posted serveral times before. I keep a copy of everything that can be reused, since there are always new instances of the same problem.
 
I can't count how many times those damn bolts strip out that hold that plate on. If you're in a crunch and need it repaired quick, just pry the sucker off. It'll break, but you'll get to your upper intake bolts. You can repair the holes and drill the screws out later, and the plates are a dime a dozen. Only do that as a last ditch thing, because it kinds sucks and looks ugly.


BTW, that 86 upper intake is heavily restrictive compared to an 87-93 upper and throttle body (58 mm throttle body and upper intake vs 60mm) the lowers are identical. If you're pulling that apart, you'll get an easy ten horses from simply swapping on a stock 87-93 upper and throttle body.