Results 1 to 4 of 4

Thread: Lifter Noise on Startup

  1. 18th March 2014, 11:55 AM #1
    81stubee
    81stubee is offline Master
    Join Date
    Jul 2006
    Location
    Ringwood VIC
    Posts
    407
    Total Downloaded
    0

    Lifter Noise on Startup

    Hi Folks,

    Finally trying to fix the lifter noise i've had since the new motor 50,00km ago. I've removed the manifolds, valley cover and one of the rocker assemblies.

    Inspection of the underside of the arms reveals some pitting in the socket part of the inlet rocker for number 6. See attached photo.



    Does this look okay? But that said i cant see how this would cause a rattle for 5 seconds at startup. Any other suggestions?

    Stu
    Reply With Quote Reply With Quote
  2. 18th March 2014, 01:02 PM #2
    PhilipA
    PhilipA is offline Swaggie Subscriber
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    14,152
    Total Downloaded
    0
    Seeing that you have had it since fitting the engine, IMHO it is most likely to be insufficient preload on the cam followers. This could be from rocker wear of rocker shaft wear. Were they replaced with the new engine?
    Regards Philip A
    Reply With Quote Reply With Quote
  3. 18th March 2014, 04:41 PM #3
    81stubee
    81stubee is offline Master
    Join Date
    Jul 2006
    Location
    Ringwood VIC
    Posts
    407
    Total Downloaded
    0
    That's the lines that i was thinking, i'm not sure that they were replaced, but they do seem in reasonable condition, but it only sounds like one lifter. Plus, further inspection has idetified a few things:

    - Several Lifters appear to be dished, i would of though that 40,000kms wouldn't be enough to do that.

    - I appear to be only getting 7.2mm of valve lift. (Measured with a Vernier on the top of the valve stem.
    Reply With Quote Reply With Quote
  4. 18th March 2014, 06:00 PM #4
    81stubee
    81stubee is offline Master
    Join Date
    Jul 2006
    Location
    Ringwood VIC
    Posts
    407
    Total Downloaded
    0
    Ignore my last, had a blonde moment!! The lifter was compressing causing me to get such a small amount of lift at the valve stem.

    New Calculations:

    Actual Lift from the Cam is 0.270" = 6.85mm

    Rocker Ratio is 1.6

    Therefore = 1.6 X 6.85mm = 10.96mm

    Which to me, says that the theoretical lift of the Valve is 10.96mm.

    I was merely checking this to confirm that the correct camshaft had been installed, which is meant to be a PC216.

    I'm going to check the preload tomorrow.
    Reply With Quote Reply With Quote
« RH Indicator works intermittently | Oil relief valve o ring »

Tags for this Thread

Bookmarks

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
  •  

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!