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DirtyBlueVan Samba Member
Joined: April 19, 2013 Posts: 122 Location: Oregon
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Posted: Sat Jun 08, 2013 11:49 am Post subject: Bad valve train noise, suddenly gone...what? |
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I changed the exhaust to fix a rich running problem, started it to check for leaks and it sounded fine. Started it the next day and it had the most horrendous sound coming from the valvetrain. The loudest tick I have ever heard in a vehicle. Drove it 20 min, still making crazy noise. I then parked it for 2 days, and then BAM gone, no more noise when I started it up to move it.
What could that of been? I'm not complaining that it went away. _________________ 1989 Syncro Westfalia 2.5 smallcar subie |
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Danwvw Samba Member
Joined: July 31, 2012 Posts: 8892 Location: Oregon Coast
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32584 Location: Reading Pennsylvania
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nemobuscaptain Samba Member
Joined: March 07, 2002 Posts: 3874
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32584 Location: Reading Pennsylvania
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DirtyBlueVan Samba Member
Joined: April 19, 2013 Posts: 122 Location: Oregon
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Posted: Sat Jun 08, 2013 4:10 pm Post subject: |
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djkeev wrote: |
A collapsed hydraulic lifter immediately springs to mind.
If the engine stopped with lifter X holding open a valve and it is weak or dirty it bled down. The next time you parked it lifter X was at rest with a closed valve and had a chance to relax and regain its "shape". Hence noise is gone. It WILL happen again given time.
Make sure you are running detergent oil that will clean up deposits.
Try running some marvel mystery oil in your oil for a few thousand miles to clean out deposits.
Dave |
It is already back to ticking, after I moved it again to give it a wash. Not nearly as bad though....How horrible is it to ignore it for 100-200 miles? I figure if it doesn't go away again it's about to bite it (258k stock motor) _________________ 1989 Syncro Westfalia 2.5 smallcar subie |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32584 Location: Reading Pennsylvania
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vw54john Samba Member
Joined: March 12, 2004 Posts: 147 Location: Cheshire, CT USA
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Posted: Sat Jun 08, 2013 11:06 pm Post subject: |
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A common issue with these engines. Mine will do it from time to time also. Mine usually goes away within 10-15 min. Have you tried adjusting your valves? Even though you have hydraulic lifters, the valves ARE adjustable. Instructions and clearances are in the Bentley manual. _________________ Regards, John
'54 Strato Silver Oval |
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zeohsix Samba Member
Joined: August 31, 2012 Posts: 501 Location: United States
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Posted: Sun Jun 09, 2013 12:07 am Post subject: |
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djkeev wrote: |
Many many MANY old Chevys with 283's 3o2's 307's 327's 350's etc ran for decades with stuck lifters!
As long as the valves are opening and closing you should be fine. You do have a physical clearance on the tappet where none was designed for..... Damage can result.
I always found stuck lifters to be annoying! I eventually replaced them on my 1968 307 Chevelle back in the early 70's just to get rid of the ticking!
Dave |
My Camaro had hellacious valve train noise with its 302 motor but I don't think it was because of collapsed lifters it had SOLID lifters for high RPM the better to win TransAm championships with. Same can be said for my wife's 70 LT-1 Vette. |
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r39o Samba Polizei
Joined: May 18, 2005 Posts: 9800 Location: San Diego
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Posted: Sun Jun 09, 2013 4:30 am Post subject: |
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That clatter will return.
This is a good time to run some MMO through.
Change the oil too.
This is likely a lifter as above
Search on MMO to find out more...... _________________ "Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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