tdc flywheel markings, im confused. - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• tdc flywheel markings, im confused. by Master ACiD on 21 Jul, 2006 20:16
• theres 2 markings on my flywheel that are both close to tdc. 1 is a big square protrusion of cast iron. the second is a "v-grooved" notch a few inches to the right of the big square protrusion.
  
  i dont know if this is a gas or diesel flywheel.
  
  i times the pump to 1.0mm using the v-groove and the engine runs lind of junky. i have to advance the injection pump cold start to get it to run good.
  
  i havent tried timing it to the square notch yet.
  
  
  what do ya guys think?
• #1 by 935racer on 21 Jul, 2006 22:09
• The big "v" grooved notch is TDC, the "0" (kind of looks like a square) is 6 degrees before TDC for timing the gassers, so you have a gasser flywheel, the diesel ones only have the big "v" notch. But you can use the one you have just fine dont sweat it.
• #2 by Master ACiD on 21 Jul, 2006 22:25
• i tend to agree with you.
  
  i just went out there and did a tdc check the ghetto way. i put a breaker bar on the crankshaft and turned the engine over untill i felt it get easy (at tdc or bdc) so i layed under the car and turned the crank left and right a bunch of times zeroing in on tdc. when i was satisfied i got out from under the car and looked at the flywheel. the v groove was exactly aligned with the bellhousing pointer.  it really must be tdc.
  
  but my engine still misses... i checked pump timing, its at 1.00mm. i rechecked the cam, its zeroed in perfectly to the crank. compression is 450-475-480-470 cyl. seems good enough.
  
  injectors? i did have the injectors tested 6 months ago and the diesel tech said they were OK and would get me by but he said i should think about rebuilding them sometime in the future. i guess i should pull em and rebuild em?
• #3 by hillfolk'r on 22 Jul, 2006 18:41
• did ya convert to a 210 mm flywheel?
  the timing marks dont work,ya gotta redo them if so
  this will really jack ya i scratched my head for a few days on this one
  i did a thread about this a while ago i can probably find it if ya need or search my threads
  basically if ya did a 210 ya need to remark the tdc mark
  ya need to make some sort of piston stop
  im thinkin ya could hang a valve open to use as a stop
  ive done this on other engines before and it works,dont get crazy with a breaker bar though
• #4 by Master ACiD on 22 Jul, 2006 20:04
• unfortunately im still using a 200mm flywheel. i thought it was the stocker too but it might not be.
  
  thanks.