B.L.Z.BUB Posted November 13, 2013 Report Share Posted November 13, 2013 (edited) So I had this weird knocking coming from my engine, I thought it was the SC12 but I just replaced it and the noise is still there. I'm 99% sure its coming from under the cam covers. All the timing marks line up and all the clearances seem fine. It is fine until the engine warms up, only happens at idle. The car seems to drive fine, pulls hard. Has 264/8.1 HKS cams (not installed by me). Video of the noise. http://www.youtube.com/watch?v=P5iEIknu8-c http://www.youtube.com/watch?v=jMJBT5LI6hQ First video today, second video when I first got it started after it got warm. I'm stumped. Cam bearings? Edited November 13, 2013 by B.L.Z.BUB Quote Link to comment Share on other sites More sharing options...
ke70dave Posted November 13, 2013 Report Share Posted November 13, 2013 You could remove the camshafts and check all the bits that it rotates on. And also check your valve clearances. sticky valve failing to close and the piston slamming it up?:S sounds freaking nasty. Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted November 13, 2013 Author Report Share Posted November 13, 2013 I found this thread : http://www.toymods.org.au/forums/tech-conversions/50521-help-broken-4age-2.html From his videos it sounds like the same noise, so I'll drop the box and check the flywheel bolts are tight. All the clearances checked out plus the noise wasnt there when it was in the MR2. Mind you I don't know if it got to operating temperature. Any other ideas appreciated :y: Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted November 13, 2013 Author Report Share Posted November 13, 2013 OK googled lots of videos of 'loose flywheels' and that seems to be the same noise. Hopefully *crosses fingers* Quote Link to comment Share on other sites More sharing options...
rian Posted November 13, 2013 Report Share Posted November 13, 2013 (edited) Next time you start it up: Edited November 13, 2013 by rian Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted November 13, 2013 Author Report Share Posted November 13, 2013 Next time you start it up: http://youtu.be/http://youtu.be/6_PLnInsh7E?t=1m32s For some reason I can't see that. Quote Link to comment Share on other sites More sharing options...
parrot Posted November 13, 2013 Report Share Posted November 13, 2013 I'm guessing it's something to do with having no legs...... Quote Link to comment Share on other sites More sharing options...
altezzaclub Posted November 13, 2013 Report Share Posted November 13, 2013 The old trick was to stick your ear onto the handle of the biggest screwdriver you owned and press the blade onto different parts of the engine. That helped pin the noise down, it cuts out all the background chatter a motor makes. There is so much noise in the video I don't know which one you're worried about! Loose flywheels should be pretty rare, and they should stop making a noise if you press the clutch down. Did it backfired badly before the noise? We had fuel fumes in the crankcase blow up one day and it bent the splash guard inside the tappet cover down onto a cam lobe, making a terrible knocking sound every time that lobe came around. Has a tappet shim jumped out? Can you take the top cambelt cover off and run it with a timing light on to see if the noise synchronieses with a cam in a certain place. It weill be interesting to see what does cause it. Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted November 13, 2013 Author Report Share Posted November 13, 2013 I did the screwdriver trick but it seems to be coming from everywhere. Might be rare but it was my first flywheel and I only did them with a socket set, no torque wrench or loctite Quote Link to comment Share on other sites More sharing options...
altezzaclub Posted November 13, 2013 Report Share Posted November 13, 2013 Might be rare but it was my first flywheel and I only did them with a socket set, no torque wrench or loctite oooohh..... I see ! 50ft.lb or so I think they should be, same as a head bolt. Quote Link to comment Share on other sites More sharing options...
Sznaps Posted November 13, 2013 Report Share Posted November 13, 2013 fly with loose screws will cut them in no time so if these were loose screws they would be cut by now I think. Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted November 13, 2013 Author Report Share Posted November 13, 2013 fly with loose screws will cut them in no time so if these were loose screws they would be cut by now I think. Ill pull the starter motor out and see if there is any movement. Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted November 13, 2013 Author Report Share Posted November 13, 2013 Starter off, definitely some movement, not much but I can make it make a slight knocking noise. I'd say at RPM it'd be louder. Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted November 14, 2013 Author Report Share Posted November 14, 2013 (edited) http://www.youtube.com/watch?v=4NcRVML4SlM I can turn all 8 bolts by hand. Lucky all 8 bolts are in one piece.Mental note, do flywheel bolts up tighter. Edited November 14, 2013 by B.L.Z.BUB Quote Link to comment Share on other sites More sharing options...
Mechanical Sympathy Posted November 14, 2013 Report Share Posted November 14, 2013 Scary. I always wondered if I hadn't torqued up flywheel bolts properly would they let go without warning. So I check them and re-check them triple-time... Good to know there's a rumble warning! So now you'll have a cheap/spare SC12 for sale?! Quote Link to comment Share on other sites More sharing options...
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