Need help diagnosing noise

bert1584 · 02-19-2015, 04:43 AM

Hi all, first post here. Will post in about me forum this evening, hoping to get some knowledgeable feedback and diagnosis here, other forums have proven somewhat lacking in knowledgeable people 😣

http://youtu.be/Z0OAJ_nr51I

So my Rx 8 has this knocking noise, about 1/3rd of engine revs at any time. Becomes quiter as revs increase, no surprise there.

The clutch is slipping, as I recently brought it I have no more info really. New clutch arriving today due to fit tomorrow.

Thoughts on this just being the failing clutch? I have suspicions but want to offer this up as a blind post.

Hoping to hear back from some experienced rotary heads!

Regards

Charlie

FerociousP · 02-19-2015, 11:52 AM

Does the noise change on accel vs decel when revving?

Is the noise completely RPM based? or does it lag behind the RPMs a bit?

Does the noise change when you depress the clutch pedal?

I saw you put your finger on the SSV actuator, which is a common-ish issue that you may have seen on youtube vids. Have you been able to move the actuator to determine that isn't the culprit?

bert1584 · 02-19-2015, 05:03 PM

Quote:

Originally Posted by FerociousP

Does the noise change on accel vs decel when revving?

Is the noise completely RPM based? or does it lag behind the RPMs a bit?

Does the noise change when you depress the clutch pedal?

I saw you put your finger on the SSV actuator, which is a common-ish issue that you may have seen on youtube vids. Have you been able to move the actuator to determine that isn't the culprit?

its linear to RPM, so I feel its something rotational orientated - no it does not lag behind.

No the noise does not change with clutch pedal - I understand there are various clutch components that disengage on clutch press, does the throw out bearing still sit between the drive shaft and the input shaft?

the linkage on the SSV is sound and the linkage is free moving.

thanks

GySgtFrank · 02-19-2015, 06:25 PM

Personally I would get the clutch fixed and go from there. The throw out bearing fits around the input shaft and if it's bad enough it could be causing the noise or it may be loose pressure plate bolts. Eliminate anything in the clutch assembly first since you know that you need to do it anyway.

02-19-2015, 04:43 AM	#1
bert1584 The Newbie Join Date: Jan 2015 iTrader: (0) Posts: 2 Rep Power: 0	Need help diagnosing noise Hi all, first post here. Will post in about me forum this evening, hoping to get some knowledgeable feedback and diagnosis here, other forums have proven somewhat lacking in knowledgeable people 😣 http://youtu.be/Z0OAJ_nr51I So my Rx 8 has this knocking noise, about 1/3rd of engine revs at any time. Becomes quiter as revs increase, no surprise there. The clutch is slipping, as I recently brought it I have no more info really. New clutch arriving today due to fit tomorrow. Thoughts on this just being the failing clutch? I have suspicions but want to offer this up as a blind post. Hoping to hear back from some experienced rotary heads! Regards Charlie

02-19-2015, 11:52 AM	#2
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro iTrader: (2) Posts: 1,046 Rep Power: 18	Does the noise change on accel vs decel when revving? Is the noise completely RPM based? or does it lag behind the RPMs a bit? Does the noise change when you depress the clutch pedal? I saw you put your finger on the SSV actuator, which is a common-ish issue that you may have seen on youtube vids. Have you been able to move the actuator to determine that isn't the culprit? __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

02-19-2015, 06:25 PM	#4
GySgtFrank Professional Stick Poker Join Date: Feb 2011 Location: Stafford, Ks. iTrader: (0) Posts: 1,005 Rep Power: 15	Personally I would get the clutch fixed and go from there. The throw out bearing fits around the input shaft and if it's bad enough it could be causing the noise or it may be loose pressure plate bolts. Eliminate anything in the clutch assembly first since you know that you need to do it anyway. __________________ 1979 SA22C (parts of one anyway) http://rotarycarclub.com/rotary_foru...ad.php?t=15585 1975 MG Midget (building) http://rotarycarclub.com/rotary_foru...ad.php?t=18681 1988 N/A SE model FC, dead stock and less than 85k on the clock. This one actually runs, so I don't fuck with it.