rockman7

I have a knocking or tapping sound coming from the rear of the engine. Can't figure it out. The engine runs good and no check engine light or smoke

Einheri

Is it an FC or an FD? What year? It could just be broken apex seals hitting the rotor housing? Or it could be detonation caused be a bad fuel mixture which could be caused by dying fuel injectors... How many miles on the FC/FD and when was the last engine refresh and are you still running OEM fuel injectors/pumps?

Narfle

iTrader: (16)

exhaust leak? bad bearing?

rockman7

Sorry. I write this thread on my phone. It's an fd 94 but the motor was off a 93 rebuild about 36000 miles on it, at least what I remember. I just check the compression and it's good. I also bought a stethoscope and it sound like it coming from from the tranny close to the bell housing. It's starting to get too dark and I can't really work on it today. Thank you for the brainstorming Einheri

rockman7

I put sealer on the exhaust gasket and I don't really think it's coming from any that. The car runs smooth besides that loud tapping noise

NeoTuri

iTrader: (2)

Does the sound change when the motor drives power to the wheels?

millennm

iTrader: (6)

Pilot bearing was either not installed, or is bad.

rockman7

The pilot bearing new. But I did notice that the input shaft from the transmission had worn groves. Could that be a problem? I didn't test drive it yet. It's sitting on four jacks so I wouldn't know how it would sound with power to the wheels

AzEKnightz

iTrader: (24)

When you say pilot bearing new, did you just installed it? Double check your work if so.

-AzEKnightz

rockman7

Check out this video on YouTube:

http://www.youtube.com/watch?v=Sm_-u...e_gdata_player

rockman7

By the way! That's my second time starting the motor on this video. It doesnt smoke anymore. So no oil leaks or blown seals.

rockman7

Lol! AzEKnightz this is my third time replacing a clutch/ flywheel/ pilot bearing on an fd. I check it very carefully before I put in... ( and that's what she said j/k) with also the seal. I took my time on it.

NeoTuri

iTrader: (2)

Cracked exhaust manifold or something downstream?

It's the only thing I can think of that explains why the tone of the noise doesn't change when you rev the engine.

PS: Hold on, is the PPF bolted securely?

AzEKnightz

iTrader: (24)

is it possible to jack the car up and put it on 4 jack stands. And have some body get under neath but stay away from anything spinning and listen to the noise? That way you can pinpoint the noise. Or bring it to a shop.

-AzEKnightz

rockman7

No want to work on rotaries in Fresno area and plus I have too much pride. I got it on 4 jacks. All I really wanna know that it's not a spun bearing or the motor. So that cool. Ima work on it after work, I'm thinking it's something with the tranny.

RotaryEvolution

iTrader: (30)

sounds clutch related, something grinding down on the bellhousing of the tranny or throwout bearing munched.

does it change at all when you put it in gear or press the clutch?

rockman7

Karack is the winner!! the throwout bearing did not wanna to snap into the ring! Thank you everyone else for your time and help!!! now its time to paint the door and trunk jams and do the body work, so I could finish my spirit r replica! I love being a body man for these reasons!!

cewrx7r1

iTrader: (2)

Sounds like an attaching bolt came loose from one of the turbos.
Most likely #1 turbo as this had happened to me an another FD.
That sound is the exhaust shooting through a 8mm hole.

Use a hose to the ear to isolate the noise.

rockman7

Thanks cewrx7r1! But, it's already fixed! Snap in ring did not go into the throw out bearing. Everythings seem to be working run. Just a little oil leaking out of the 2nd turbos return line but that easy to fix.