Knocking noise - help??
#1
I've been doing a valve adjustment and various seals on the engine. Had previously started the engine with exhaust minus the cat and this noise wasn't noticed. Have installed a decat today and when started this noise was there. It doesn't sound like a blowing noise. Pretty concerned that the knocking could be doing damage to the engine so worried to have it running to try and diagnose. Any thoughts on what this could be?
http://s1168.photobucket.com/user/ra...vkifn.mp4.html
http://s1168.photobucket.com/user/ra...vkifn.mp4.html
#3
Have you tightened the rocker shaft bolts up tightly? Difficult to hear properly on the video clip but there is a metallic tappet sound there?
One of mine came loose resulting in a loud tappet sound. Fortunatley I caught it in time and once re-tighened and clearances checked AIO.
Having witnessed this I'm convinced that this act is what leads to engine rebuilds, noisy tappety engine due to rocker shaft coming loose, lossens further and rocker goes on to foul the cam
One of mine came loose resulting in a loud tappet sound. Fortunatley I caught it in time and once re-tighened and clearances checked AIO.
Having witnessed this I'm convinced that this act is what leads to engine rebuilds, noisy tappety engine due to rocker shaft coming loose, lossens further and rocker goes on to foul the cam
#6
On further review I have identified that the distributor belt has broken for secondary distributor. Could this account for the noise? I stopped going back and checking the valve adjustment as until this is fixed there is no point. With the distributor belt being broken and the second distributor rotor arm being able to spin freely could this have affected the timing and would that account for the noise?
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#9
Goughary thanks for the advice. Removed the connection from coil to secondary distributor and recorded this.
http://s1168.photobucket.com/user/ra...97uha.mp4.html
I know there is a blow from the exhaust and I still think the valves need to be adjusted properly but it's a definite improvement. Do you agree?
What are the thoughts should I still have the engine apart to check the Pistons etc?
http://s1168.photobucket.com/user/ra...97uha.mp4.html
I know there is a blow from the exhaust and I still think the valves need to be adjusted properly but it's a definite improvement. Do you agree?
What are the thoughts should I still have the engine apart to check the Pistons etc?
#10
Technical Guru
Rennlist Member
Rennlist Member
Undo the connectors at the bottom of the image and ignore the red arrow...
#11
Race Car
Well there is clearly something different from one video to the next...so you already know your disty belt needs to be changed. While that's out, pull the valve covers and check the tolerances...zip it all back up and when the new belt is in, see if you still have your issues. I hope it's nothing serious.
#12
Rennlist Member
Concur, Sounds like a mis-adjusted valve. All it takes is to not get your adjustment exactly on the heal of the cam.
A small bit of hose can work as a stethoscope in a pinch. A mechanical tap can be separated from a exhaust leak by resting a long screwdriver on the valve cover and against your ear. Listen for the loudest tick and you can narrow it down.
A small bit of hose can work as a stethoscope in a pinch. A mechanical tap can be separated from a exhaust leak by resting a long screwdriver on the valve cover and against your ear. Listen for the loudest tick and you can narrow it down.