I took lower manifold off and carb cleaned everything spotless. Put the rods back in and made sure everything worked perfect but was wondering if I needed to lube it up to prevent carbonization. I think dry is the best but mabey some lithium grease or wd-40 would work to. Any thought and opinions?

Also how many miles does it take for these things to carbonize? im guessing 40k

 

wd-40 ONLY

Use no other grease.
this would carbonize in a month and lock them all over again.

Then make sure that you use about two-3 bottles of fuel injector cleaner in a full tank of high octane gas at least once overy other oil change.

This will protect your time investment.

Did you re vaccum hose the entire car?
If not, dont even THINK of using the old hardened vaccum lines.

youll end up with one massive vac leack for all the minor ones at each hose.

go get windsheild washer / vac hose and replace all of them one at a time.

Trust me on this one.
I do this work all the time.

 

ok thnx alot. I will do this. I have not replaced the vac hoses but guess its time eh. I will get the silocone vacs from mazdatrix if they work.

 

A Mazda rotary mechanic told me to use absolutely nothing at all.

- Coop -

 

you mean no vac hoses? are you serious? Can you explain a little more?

 

i think he means no lubricant

 

lol ohhh ok. Yeah that makes sense to. Even wd-40 will gather up dirt and stuff and carbonize to im sure. But not completly sure. I will use nothing because im sure that mazda used nothing when they came off the assembly line.

 

yes, you want to put them in dry and make sure they, and the engine are spotlessly clean. you also dont need to replace the vacuum lines unless there is a problem. they are all under vacuum, and they have been on there for 10+ years, they arent going anywhere. replacing all the hoses is for the fd guys, they screw it up every time too.

mike

 

The WD-40 is washed away instantly.

It is used to only lube the sleeve and rods long enough to prevent binding during installation and assembly.

There is a problem.

(thats why I spent that time typing all those words in that particular order.)

You see, they have been under vaccum in a hot engine for 10+ years.

But you knew that.

They are hardened.

I have to assume that you havent run across a FC with hard vacuum lines yet.

Its a bit irresponsible to suggest to a person doing this for the first time that the lines dont need replacing.

If there is a '7 with lines as old as his, that DONT need replacing once removed, then thats the freakiest RX-7 i have ever seen.

Any car that needs a intake cleaning, is old enough to need the hoses replaced too.

I would have assumed that you were suggesting that his lines are soft, but then you mentioned that they are 10+ years old, so you MUST know that the heat has ruined them by now.

Once removed they will never do anything more than spin freely in the spider connections they once were firmply attached to.

They need replaceing. I didnt throw that suggestion out lightly, I know its work, but its sheer stupidity to replace them when they wont seal ever again.

And they wont.

I have performed this intake rebuild/cleaning on no less than 12 cars now.

Each one needed new lines.

DO NOT re-use the old lines.

This is a recording.