Motor vibrations
Thread Starter
Intermediate
Joined: Apr 2014
Posts: 39
Likes: 0
From: Munich
Motor vibrations
I find a slightly motor vibration interference, means vibration is comming an going sinusoidal (some seconds). Could this be a valve lash problem? Do anyone have informations how to adjust the valve lash? Never did this before.
Thanks
Thanks
Melting Slicks
Joined: Apr 2002
Posts: 3,100
Likes: 2,355
From: Allison Park, PA
Are you sure that the vibration is in the engine? I had an annoying vibration last year - it became apparent @ 1500 rpm's, and was very noticeable @ 2,000 rpm's and above. It turned out to be a bad fan clutch assembley! Good luck.
Tom
Tom
Race Director
Joined: Jan 2003
Posts: 17,681
Likes: 3,678
From: Central Arkansas
I think you are going to have to be a lot more specific in describing the vibration issues to get som good suggestions. Are you sure it's engine and not drivetrain or tire related. For instance is it specific to a certain engine rpm or range. Does it occur in each gear? Does it change when driving in that rpm range and dropping off the throttle and pushing in the clutch? Can you feel it reving the motor in neutral?
I would doubt it's specific to valve lash unless there are some other factors involved like a flat cam lobe or bent push rod. A couple fairly easy troubleshooting tests (in addition to the above) are: if it vibrates in neutral while reving, try pulling the fan belt to isolate all the accessories and see if that changes anything. If so then look at the pulleys and accessory bearings. Crawl underneath and grab the driveshaft right behind the transmission yoke and see if it has any side to side play in it. Worn transmisssion rear bushings often cause vibration.
But try to make sure it is engine related and not drivetrain or wheel related.
I would doubt it's specific to valve lash unless there are some other factors involved like a flat cam lobe or bent push rod. A couple fairly easy troubleshooting tests (in addition to the above) are: if it vibrates in neutral while reving, try pulling the fan belt to isolate all the accessories and see if that changes anything. If so then look at the pulleys and accessory bearings. Crawl underneath and grab the driveshaft right behind the transmission yoke and see if it has any side to side play in it. Worn transmisssion rear bushings often cause vibration.
But try to make sure it is engine related and not drivetrain or wheel related.
