[Vwdiesel] Re: 107A vs 107AG1.6L pumps (was head gasket - black smoke)

[LBaird119 at aol.com]

> Loren, I definitely have a 107A pump.  Are all 107A pumps the yellow dot 
> pump or are some yellow dot and some non-dots?

  ALL 107 A pumps are "yellow dot" pumps.  The 107 AG isn't.  It's the part 
number and that's what denotes it as a unique pump, as do all the other 
pumps part numbers.  This is just one, big difference between it and other 
pumps.


> 
> If the 107A doesn't tell me for sure, how can I tell which I have?


  You can double check the Bosch number on it  0-460-494-005 but the 
107 a is a definite identifier.  IF the engine/pump is known to be original
then the orange timing sticker WON'T say to time it to .88mm.  It'll give 
some degrees BTDC or something like that.  They didn't put the dial 
gauge settings on the yellow dot's timing stickers.


> 
> What will happen if I advance it to 1.15(?) and it's normal pump? (I don't 
> want to break anything!)


  It would clatter pretty loudly, might sound like it's bucking a bit.  Never 

tried it though. :)

> 
> It's acting like the fuel builds up and ignites when there's a pool in the 
> cylinder, completely unrelated to the injection time.
> 

  That IS possible but most likely your smoke would be white rather 
than black and it would be an injector problem, independant of the 
pump.
  I've retimed a couple of 107 A's that were timed to .88mm.  They ran 
semi ok but had no power, slow to rev, not sure about smoke.  Now IF 
it was timed with the advance lever pulled out, then it might do what 
yours is doing since it would be retarded even more.
     Loren