03 Nov 11 07:17, Mark Hofmann wrote to Roy Witt:   
      
      
    RW>> In the old days, we used to clean the sludge out of engines by   
    RW>> filling them with kerosene and one quart of detergent oil. Let it   
    RW>> come up to full temp and hold there for 20 minutes. Drain and   
    RW>> refill, again replacing the filter.   
      
    MH> That sounds sort of like what is in the Marvel Mystery Oil.  The   
    MH> thing is, the engine is new (Jasper rebuilt), so there shouldn't be   
    MH> any sludge or junk in there yet.   
      
   I wouldn't do the above to this engine.   
      
    MH> It looks clean inside.  I almost   
    MH> thought the opposite - where it doesn't have enough gunk built up yet   
    MH> to keep the oil on the valves when turned off for long periods of   
    MH> time.   
      
    MH> It only does it for around 20-30 seconds on a cold start in the   
    MH> morning or when leaving work to come home.  Other starts that don't   
    MH> allow it to sit long periods of time, it won't do it.  It runs and   
    MH> idles totally quiet, too.  Just that initial cold start for 20-30   
    MH> seconds.  It is less now that I am using synthetic, though.  I used   
    MH> 10W-30 synthetic.  The thicker made it louder on the cold starts.   
    MH> Not sure if it is value tap, piston slap, or what.  Just a   
    MH> tap-tap-tap and then it goes away.   
      
   What you have is a leaky lifter. If it sits for a while, the oil drains   
   out of the lifter, probably due to the valve spring pressure. It shouldn't   
   do that, but sometimes they do. If that 30 sec noise doesn't bother you,   
   don't worry about it.   
      
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