Changed clutch and flywheel..knock sound? - D-series.org

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Old 09-19-2011, 09:27 PM   #1 (permalink)
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Default Changed clutch and flywheel..knock sound?

I changed the clutch and flywheel (lightweight) and upon intial start up there was a noise so i killed the motor. Pulled bell house inspection plate the following day after work and determined it was not grinding anything.. so i cranked the motor over with the wires off and it sounds like it has a knock? any ideas im stumped...
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Old 09-19-2011, 10:10 PM   #2 (permalink)
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are the gearbox mountings properly torqued? to check if the flywheel is rotating fine, you can get under the car, take the dust cover off, spin the motor and see if the flywheel is rotating true. let me know if you want me to elaborate. shall whip up some pictures.
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Old 09-19-2011, 10:30 PM   #3 (permalink)
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I already took the dust cover and check out that and ruled common sense out.. my only other theories are castrophic ones..
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Old 09-19-2011, 10:32 PM   #4 (permalink)
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Originally Posted by 007 View Post
are the gearbox mountings properly torqued? to check if the flywheel is rotating fine, you can get under the car, take the dust cover off, spin the motor and see if the flywheel is rotating true. let me know if you want me to elaborate. shall whip up some pictures.
do you mean the mounting from bell house to block or motor mounts to tranny? the clunk is in time with the motor
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Old 09-19-2011, 10:33 PM   #5 (permalink)
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very strange then. I cannot picture what would cause a flywheel change to lead to engine knocking. but if you suspect something catastrophic, you might wanna start by taking the oil sump down and checking your engine bearings.

are you sure you didnt touch anything else besides the gearbox while changing the clutch and flywheel?
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Old 09-19-2011, 10:36 PM   #6 (permalink)
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touch like what? i took the tension detent spring out of the top ( in the field) 10mm.. thinking it was the M/t fill??
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Old 09-19-2011, 10:38 PM   #7 (permalink)
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could the motor go out of balance due to the fact the severity of weight changed from a 20Lb flywheel to an 8-9ish?
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Old 09-19-2011, 10:45 PM   #8 (permalink)
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Originally Posted by 4drEK425 View Post
do you mean the mounting from bell house to block or motor mounts to tranny? the clunk is in time with the motor
I mean the mount that connects the gearbox casing to the firewall. I had some knocking noise too and in my case it was the mounting bolt slipping out [the threads in the mounting were eaten away] and banging against the exhaust pipe. at first glance it sounded like it was coming from the motor but that wasnt the case. these noises can be hard to trace.

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could the motor go out of balance due to the fact the severity of weight changed from a 20Lb flywheel to an 8-9ish?
I have also changed from a stock flywheel to a Fidanza 7 lb and havent faced any problems so far. it would be a pretty long shot for a simple flywheel change to immediately take the engine out. did you check if your flywheel was rotationally balanced?

my first guess is that it is something loose in the gearbox.
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Old 09-19-2011, 10:58 PM   #9 (permalink)
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so do you think the mounts/torque spec etc are that critcal? i mean i double checked etc watched it spin with the dust cover plate off but when i pulled the plugs and rolled the flywheel seemed good but theres that clunk...
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Old 09-19-2011, 11:00 PM   #10 (permalink)
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Originally Posted by 007 View Post
I mean the mount that connects the gearbox casing to the firewall. I had some knocking noise too and in my case it was the mounting bolt slipping out [the threads in the mounting were eaten away] and banging against the exhaust pipe. at first glance it sounded like it was coming from the motor but that wasnt the case. these noises can be hard to trace.



I have also changed from a stock flywheel to a Fidanza 7 lb and havent faced any problems so far. it would be a pretty long shot for a simple flywheel change to immediatel take the engine out. did you check if your flywheel was rotationally balanced?

my first guess is that it is something loose in the gearbox.
what you mean by rotationally balanced? second when the clutch is in the gears aren't turning in the tranny right? I haven't driven the car yet under load nor have i reved it only started and killed and rolled it over
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Old 09-19-2011, 11:02 PM   #11 (permalink)
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yup. the torque specs are absolutely critical. have you tried getting under the car and pinpointing the exact location of that noise?

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what you mean by rotationally balanced? second when the clutch is in the gears aren't turning in the tranny right? I haven't driven the car yet under load nor have i reved it only started and killed and rolled it over
by rotationally balanced, I mean that the flywheel metal being of uniform density and evenly spread throughout the area so that rotation doesnt cause any sideways play / unwanted vibrations. you mustve seen wheels being balanced right? same concept. just out of curiosity, what flywheel are you using? any links?

the gears dont necessarily have to be turning. if something was loose inside, would still clang because of the vibrations being created by the crank turning.

Last edited by 007; 09-19-2011 at 11:06 PM.
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Old 09-19-2011, 11:06 PM   #12 (permalink)
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yeah i got under with a stethoscope but its hard to tell.. I guess i could deweight the motor tranny and re torque everything?
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Old 09-19-2011, 11:16 PM   #13 (permalink)
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yeah i got under with a stethoscope but its hard to tell.. I guess i could deweight the motor tranny and re torque everything?
that would be the best thing to do. take off the oil sump and check your bearings also while you are at it. good luck.

if I remember correctly, the flywheel bolts need to be torqued to 120 Nm.
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Old 09-19-2011, 11:16 PM   #14 (permalink)
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A loose flywheel will make a knock noise along with a bad isb. Is your engine oil shiny?
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Old 09-19-2011, 11:40 PM   #15 (permalink)
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how could it be the ISB if ive nevered driven the car or engaged the new set uP?
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Old 09-20-2011, 12:22 AM   #16 (permalink)
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You can damage the ISB as you fit the gearbox to the engine if it is not lined up perfectly.

It can also be the flywheel to crank bolts are loose as mentioned above.

It can also be flywheel to crank bolts are sticking to far through and hitting the bock.

It can also be the pressure plate bolts sticking through and hitting the block OR being to far out and hitting the bell housing.

It can also have the clutch throwout bearing out of whack and hitting something or the clutch plate in the wrong way round or the clutch plate springs if any hitting the flywheel if the clutch is disengaged or even the throwout bearing being pushed in to far and applying enough end thrust to knock out a thrust bearing.

It can also be to long a bolt used to bolt something to the bell housing and sticking in enough to hit the clutch or flywheel.
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Old 09-20-2011, 01:00 AM   #17 (permalink)
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Pressure plate hitting the webbing inside the tranny housing?

pat covered about everything else.
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Old 09-20-2011, 01:42 AM   #18 (permalink)
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there you have it @4drEK425. the experts have spoken. your engine should be fine
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Old 09-20-2011, 02:48 PM   #19 (permalink)
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I am down with pat on his guesses, except this one:

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It can also have the clutch throwout bearing out of whack and hitting something
That bearing, even when installed backwards (which isnt possible in this case) wouldnt cause a knock or thump. Mostly due to the TOB having to ride on the quill.
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Old 09-20-2011, 03:46 PM   #20 (permalink)
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I am down with pat on his guesses, except this one:



That bearing, even when installed backwards (which isnt possible in this case) wouldnt cause a knock or thump. Mostly due to the TOB having to ride on the quill.
so it can be out of whack on initial start up even though i never driven it yet?
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