Results 1 to 4 of 4

1800 RPM vibration?

This is a discussion on 1800 RPM vibration? within the Internal Engine forums, part of the LSx Technical Help Section category; A friend of mine has just replaced the crank sprocket, cam sprocket and roller chain on his 98 LS1 Camaro ...

  1. #1
    z28krazy
    Guest

    Thumbs down 1800 RPM vibration?

    A friend of mine has just replaced the crank sprocket, cam sprocket and roller chain on his 98 LS1 Camaro after 130k miles. He used all GM factory parts and gaskets for this job.

    It now has an annoying engine vibration at 1800 - 2000 rpm.

    The Chevrolet dealer parts man and the factory say the sprockets are the right ones for this engine and suggests that the harmonic balancer be checked.

    He re-used the old balancer, which does not have a key to locate it on the crank snout, and inspection doesn't show any counter weights or drilled holes to indicate that it has been or needs to be balanced.

    He also installed a new water pump at the same time as the timing chain swap. We plan on testing the balance of the water pump by removing the drive belt and running the engine.

    Has anyone run into this problem?

    Would rotating the balancer on the crank make a difference?

  2. #2
    Member jambofla's Avatar
    Join Date
    Jan 2007
    Location
    Northwest Florida
    Posts
    409

    Black
    2002 SS

    Harmonic Balancer

    I have recently removed the balancer from my 2001 LS6 without knowing that there was no key way for alignment. The Chevy Tech line is looking to see if there is a way to realign the balancer in the original position without going through pulling the motor for a trip to a shop for rotational balancing. They told me that you are supposed to score the crank and the balancer to insure that they are reinstalled in the same position. If you read further there are some people that have been nstalling under drive pulleys with no balancers. Some people are having bearing problems and some are not. I guess it is the luck of the draw as far as getting the position correct. Wish I had known ahead of time but...
    Good luck and I will let you know if I find out a simple method from GM

  3. #3
    z28krazy
    Guest
    Bearing problems. I sure hope that the HB isn't the culprit doing that!

  4. #4
    Member jambofla's Avatar
    Join Date
    Jan 2007
    Location
    Northwest Florida
    Posts
    409

    Black
    2002 SS

    Latest info from local Dealership. Find an LS1 or LS6 that you can rotate to TDC. (Remove #1 plug and rotate motor until piston is at the top of compression stroke, hold your finger over the spark plug hole tightly until you don't feel anything coming out). Use a digital camera to photograph the position of the balancer on the motor that you ran up to TDC. Run your motor up to TDC and install balancer in the same position as the other. Pretty high tech huh? I guess it is better than nothing.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 1800-2000rpm constant idle
    By cammedta in forum General Help
    Replies: 29
    Last Post: 12-10-2013, 09:25 PM
  2. Question: vibration up to 1800 rpm
    By JayTA98 in forum General Help
    Replies: 6
    Last Post: 02-14-2011, 06:16 AM
  3. $1800 monster
    By darkwingduck in forum Kill Stories
    Replies: 16
    Last Post: 03-01-2010, 05:16 PM
  4. Drivin the ws6 1800 miles!
    By Pickle86 in forum Firebird / WS6
    Replies: 14
    Last Post: 05-05-2009, 04:29 PM
  5. FS: 1968 Firebird AT 90K $1800
    By telimator in forum Vehicles For Sale / Trade
    Replies: 1
    Last Post: 08-08-2005, 10:56 PM

Members who have read this thread: 0

There are no members to list at the moment.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •