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help identifying a very unhealthy sound
by
RabbitJockey
on 20 May, 2015 19:54
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Got my aaz rabbit back on the road last night and after about 20 minutes of driving it began making this noise, it goes away under mostly acceleration and depressing the utch changes it some. It seems to be louder on the trans side of the car. I turned over the engine by hand and it felt fine, it also still drives the same and has no loss of power, thanks for any help!
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#1
by
libbydiesel
on 20 May, 2015 21:45
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Wow, that sounds terrible. Turbo would be my first guess, but odd that you aren't feeling a loss of power.
How's the alt? Clutch?
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#2
by
RabbitJockey
on 21 May, 2015 04:35
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i would say it is definitely not the turbo it boosts fine to 12psi and sounds normal, i also felt it by hand feels just like new(i just rebuilt it.) maybe some of the sound quality was lost when i uploaded the video. it sounds like more of a rattling knocking sound, almost like it could be a precup coming loose hitting the piston, but i would think i'd have a loss of power for that, also a more consistent sound. alternator is fine, but i am suspicious of the clutch setup, it drives fine but something may have come loose with it, i think i can get a 1/4" ratchet in to the timing hole and make sure the flywheel bolts are tight.
also for years even before this swap, the starter on this car would have the bendix stick out for a second or 2 after starting, so it could be related to that although it starts fine.(with lots of noise) i'll also be pulling the starter tonight.
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#3
by
burn_your_money
on 21 May, 2015 07:39
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Does the sound change if you remove the green alligator clip?
Have you tested your lifters?
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#4
by
jmaddocks
on 21 May, 2015 08:31
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My son's Jetta started making a horrible racket several weeks ago. Pressing the clutch would change the sound. Turns out we had ripped two of the straps on the pressure plate...one was still dangling from the PP, and the other was just bouncing around inside the bell housing. Just another idea, fwiw.
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#5
by
RabbitJockey
on 21 May, 2015 09:23
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Ill check that stuff tonight.
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#6
by
RabbitJockey
on 21 May, 2015 14:14
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Pressure plate to crank bolts must have backed out, i can reach in and there is about Half an inch of play that i move the pp/flywheel by hand. Hopefully the pp holes have elongated so i dont have to buy a new pp. I guess well see once i get it torn off. I am certain that i torqued the crank bolts properly but i must have done something wrong. Either way, atleast the engine is ok, this could have been a much worse situation
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#7
by
RabbitJockey
on 22 May, 2015 07:21
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you guys can make fun of me, it's ok i can handle it
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#8
by
jmaddocks
on 22 May, 2015 08:05
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As a guy who gave up a good chunk of a weekend on my back two weeks ago, changing a nine-month-old clutch (between business trips, no less), I'm in no position to make fun of you...
I'm just glad you found out what's making the noise. Curious about root cause, once you're able to do some forensics.
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#9
by
RabbitJockey
on 22 May, 2015 09:49
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haha, it's all a part of the journey and learning not to *** up. i know i torque the bolts proper but i am not sure whether or not i did the final quarter turns. i am just hoping that the pressure plate holes are still round, how ever i doubt that they are, and i am thinking i will have to buy a new one. and i had used new bolts that even come with loctite already on them... clearly something when wrong though.
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#10
by
Gizmoman
on 23 May, 2015 05:30
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No expert here but when you install the new bolts, make sure you run a bottoming tap into the holes first and blast em good with brake cleaner and air a few times.
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#11
by
air-cooled or diesel
on 23 May, 2015 11:34
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when i first heard it, the quality isnt too good, you can hear some clicking, but the main sound is like something has spun, a whirring; yup a clutch plate coming loose prob sounds like that; hopefully you can fix it and no big problem.
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#12
by
dontdoemyourself
on 27 May, 2015 11:02
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This happened to a worked 2.0 16v I had years ago.. Didn't figured it out until I was replacing the bottom end of the engine again and my PP wouldn't come off.. D'oh!
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#13
by
RabbitJockey
on 28 May, 2015 05:18
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This happened to a worked 2.0 16v I had years ago.. Didn't figured it out until I was replacing the bottom end of the engine again and my PP wouldn't come off.. D'oh!
your pp was stuck on?
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#14
by
dontdoemyourself
on 28 May, 2015 21:36
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Yeah, it chewed up the crank end, and required some prying to get it off.. I had just replaced the bottom end due to a spun bearing a few weeks before, and figured it was that again.. After I found the loose pressure plate it made sense,