Weird sound from engine bay
#1
Full Member
Thread Starter
Weird sound from engine bay
I know this one goes like this i just dont know how the spring and the other piece goes
I've checked everything and I think this has to be the problem, the car is a 79 SA with the original 12a and the nikki. The car has been having a weird sound that I would assume is an exhaust leak but I checked everything and it was tight. My grandpa said that this might be the problem though. What even are those used for?
#2
Have RX-7, will restore
iTrader: (91)
There's supposed to be a diaphragm in there. That's where the air control valve goes, being secured with three 10mm nuts. I'll have to pull the ACV off of one of my early SA intake manifolds and see if the slotted piece is supposed to have any rubber on it. I don't see why it would be open and slotted rather than have a diaphragm in its place.
#3
1st-Class Engine Janitor
iTrader: (15)
Can-shaped thing goes in first as you have it in the bottom picture, then the spring, then the round metal cap with the dome facing OUT. Then the ACV (Air Control Valve) gasket (which is really thick, about 3/8", and acts as a seat for the dome on the cover) and the ACV itself goes over it all, holding the spring in place. The ACV has a number of diaphragm valves and hoses that go to it.
It's the check valve for the air induction system, part of the emissions controls for pre-catalyst cars. There's a really crappy photo of it on page 1A:2 of the '80 FSM (figure 1A-8). '79 was identical.
It's the check valve for the air induction system, part of the emissions controls for pre-catalyst cars. There's a really crappy photo of it on page 1A:2 of the '80 FSM (figure 1A-8). '79 was identical.
#4
Full Member
Thread Starter
Can-shaped thing goes in first as you have it in the bottom picture, then the spring, then the round metal cap with the dome facing OUT. Then the ACV (Air Control Valve) gasket (which is really thick, about 3/8", and acts as a seat for the dome on the cover) and the ACV itself goes over it all, holding the spring in place. The ACV has a number of diaphragm valves and hoses that go to it.
It's the check valve for the air induction system, part of the emissions controls for pre-catalyst cars. There's a really crappy photo of it on page 1A:2 of the '80 FSM (figure 1A-8). '79 was identical.
It's the check valve for the air induction system, part of the emissions controls for pre-catalyst cars. There's a really crappy photo of it on page 1A:2 of the '80 FSM (figure 1A-8). '79 was identical.
#5
Full Member
Thread Starter
I know this one goes like this i just dont know how the spring and the other piece goes
I've checked everything and I think this has to be the problem, the car is a 79 SA with the original 12a and the nikki. The car has been having a weird sound that I would assume is an exhaust leak but I checked everything and it was tight. My grandpa said that this might be the problem though. What even are those used for?
Is this square hole supposed to get covered by the manifold??
because i checked it and it isnt big enough to cover that hole TBH
#6
Out In the Barn
iTrader: (9)
Check out this thread. I just posted my similar experience with my all stock early 1979. I just ordered a 1981-1985 intake gasket and will enlarge the gasket port size.
https://www.rx7club.com/1st-generati...1104049/page2/
https://www.rx7club.com/1st-generati...1104049/page2/
#7
Full Member
Thread Starter
Check out this thread. I just posted my similar experience with my all stock early 1979. I just ordered a 1981-1985 intake gasket and will enlarge the gasket port size.
https://www.rx7club.com/1st-generati...1104049/page2/
https://www.rx7club.com/1st-generati...1104049/page2/
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#8
Out In the Barn
iTrader: (9)
I don't know why, but the stock intake just blocks that square port. The 1979 gasket I ordered from Rock Auto, as shown in my pic in that thread, would cause the port to not be sealed creating an exhaust leak. With the 1981-1985 gasket, the intake will seal.
I hope someone else can chime in on what is going on and maybe the correct gasket to use. When I got my car it had sat for 20 years and the gasket was dust.
I have the factory part manual and it shows a gasket that does not even incorporate the square exhaust port.
I hope someone else can chime in on what is going on and maybe the correct gasket to use. When I got my car it had sat for 20 years and the gasket was dust.
I have the factory part manual and it shows a gasket that does not even incorporate the square exhaust port.
#9
Out In the Barn
iTrader: (9)
If your referring to the gasket in my pic, yes, that one will not work. Here is the one I ordered. I'll enlarge the center ports on the gasket to match the irons/intake.
81-85 12A Rx7 Lower Intake Manifold Gasket (1881-13-111B)
81-85 12A Rx7 Lower Intake Manifold Gasket (1881-13-111B)