Intake Manifold Removal
02-20-24 | 07:20 PM
#1
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From: California
Intake Manifold Removal
Hey everyone. I have to remove my intake manifold and I have been struggling to find a good explanation of how to do so. My car is a 1981, bone stock. Has the full rats nest. Can anyone explain the process?
02-20-24 | 08:03 PM
#2
if you don't already have one, get a copy of your FSM from: Foxed.ca
section 4A should help you out a bit with identifying things and maybe even helping to label. it sort of walks you through but it uses the correct names of all parts, so if you're not already familiar with them, then it may be a bit intimidating/confusing.
paper tape will be a good friend of yours through the process. you can use strips of it to label where hoses go. remove them carefully, but be prepared to have to replace some due to age.
if you choose to take the carbie off first, then it will be four 12 mm nuts holding it to the manifold - a wrench is best since you still have all the original equipment on it. be patient, it can be tedious.
make sure to label the cables - throttle, choke, etc. the throttle cable is locked in place with to 12 mm nuts and a little clip. once you remove it from the bracket, you have hold the throttle open with your hand to remove the cable. the fuel lines are pretty straightforward, you can't really mix them up. there are a handful of electrical plugs, once again, label them.
the MOP requires you to remove a really small cotter pin.
now you should be down to the manifold. it has 6 fasteners - all 12 mm - four bolts and two nuts. the nuts are hard to see because of the exhaust, so you will either have to use a mirror or get to them by feel. they will be right inline with the exhaust manifold studs.
that's all i can remember for now.
section 4A should help you out a bit with identifying things and maybe even helping to label. it sort of walks you through but it uses the correct names of all parts, so if you're not already familiar with them, then it may be a bit intimidating/confusing.
paper tape will be a good friend of yours through the process. you can use strips of it to label where hoses go. remove them carefully, but be prepared to have to replace some due to age.
if you choose to take the carbie off first, then it will be four 12 mm nuts holding it to the manifold - a wrench is best since you still have all the original equipment on it. be patient, it can be tedious.
make sure to label the cables - throttle, choke, etc. the throttle cable is locked in place with to 12 mm nuts and a little clip. once you remove it from the bracket, you have hold the throttle open with your hand to remove the cable. the fuel lines are pretty straightforward, you can't really mix them up. there are a handful of electrical plugs, once again, label them.
the MOP requires you to remove a really small cotter pin.
now you should be down to the manifold. it has 6 fasteners - all 12 mm - four bolts and two nuts. the nuts are hard to see because of the exhaust, so you will either have to use a mirror or get to them by feel. they will be right inline with the exhaust manifold studs.
that's all i can remember for now.
02-20-24 | 08:09 PM
#3
I like to use the parts manual to know where each part is. https://www.foxed.ca/rx7manual/manua...000A-4600A.PDF
Take a bunch of pics of the intake, carb, and rats nest before starting. Get a 3/8" joint socket extension and some ratchet wrenches. I also like to use shorty wrenches. Buy the intake gasket and o-rings before starting this.
Remove the four bolts and two nut that hold the intake manifold to the engine. I sometimes also remove the exhaust manifold. I remove the output of the exhaust manifold first then the engine side. It's not easy to get to the underside of the manifold bolts. Have a good LED light. Do not remove the carb from the intake and do not remove the rats nest from the carb. This is my method Others like to remove each part separately. There are two or three bolts that hold the rats nest vacuum manifold to the top of the engine. You will need to remove a couple of solenoids to get to them but try not to remove the hoses and take more pics of each part you touch before removing it.
Take a bunch of pics of the intake, carb, and rats nest before starting. Get a 3/8" joint socket extension and some ratchet wrenches. I also like to use shorty wrenches. Buy the intake gasket and o-rings before starting this.
Remove the four bolts and two nut that hold the intake manifold to the engine. I sometimes also remove the exhaust manifold. I remove the output of the exhaust manifold first then the engine side. It's not easy to get to the underside of the manifold bolts. Have a good LED light. Do not remove the carb from the intake and do not remove the rats nest from the carb. This is my method Others like to remove each part separately. There are two or three bolts that hold the rats nest vacuum manifold to the top of the engine. You will need to remove a couple of solenoids to get to them but try not to remove the hoses and take more pics of each part you touch before removing it.
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