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  Msg # 2164 of 2177 on FAUTOM25, Saturday 4-13-12, 9:19  
  From: MARK HOFMANN  
  To: ROY WITT  
  Subj: Re: Odd rumble in Durango solved.  
  RW> I did a power flush with a system cleaner, so anything like that would  
  RW> have ended up in the flush machine. Harry wouldn't have been a very  
  happy  
  RW> camper if that was the case.  
    
  I'm sure the Durango power flush of the antifreeze and transmission put some  
  nasty goop in the flush machine...  
    
  RW> The problem could have occured when people used tap water instead of  
  RW> adding more Dexcool to the system when it was low on coolant.  
    
  Most of the cases I heard involved Dex-Cool eating away at the gaskets and  
  leaking. The one mechanic said you can almost guarantee the early Dex-Cool  
  cars to have a coolant leak before 80k.  
    
  RW> If you spend a lot of money maintaining your vehicles with them, they're  
  RW> going to take care of you as a good customer should be.  
    
  Yes, they don't take advantage of people and run a nice shop. This is why  
  they are always busy and you have to schedule an appointment to bring your  
  car  
  to them.  
    
  RW> There's nothing to be afraid of, there's just a bunch of rocker arms  
  RW> 'rocking' away opening and closing valves under those covers. With  
  RW> hydraulic lifters and after the initial adjustment with the engine  
  RW> running, there's no need to R&R the covers again.  
  RW>  
  RW> For solid lifter engines, especially that 30/30 Duntov cam, required  
  RW> valve  
  RW> adjustments about once a week; or after a hard run on race day.  
    
  Is there an adjustment that can be made to stop the "cold engine value tap"  
  or  
  whatever it is called?  
    
  It really isn't worth taking off the re-sealed value covers at this point.  
  I  
  think I'm going to try the 0W-20 synthetic on my next oil change.  
    
  - Mark  
    
    
  --- WWIVToss v.1.50  
   * Origin: http://www.weather-station.org * Bel Air, MD -USA (1:261/1304.0)  

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