wheelsup Posted April 3, 2010 Report Share Posted April 3, 2010 So I am slowly taking apart a parts car to learn about our 850's, and have basically zero background knowledge of how cars and engines/transmissions work. On the flywheel there is a gap in the inner ring (circled in red). When I take the flywheel off (to replace the RMS), do I need to make sure this gap is in the same position as it was before I took it off? And what is the reason for this gap in the first place? Anyone know? Link to comment Share on other sites More sharing options...
Volvo5.0 Posted April 3, 2010 Report Share Posted April 3, 2010 When you put the flywheel back on you'll notice a dowell pin in the crank. Line it up with the small hole in the flywheel and you're good to go. Link to comment Share on other sites More sharing options...
wheelsup Posted April 3, 2010 Author Report Share Posted April 3, 2010 OK cool thanks. I didn't want to take the thing off without knowing beforehand (rare for me). Normally I just take stuff apart and hope I can figure it out. Link to comment Share on other sites More sharing options...
yangotang Posted April 3, 2010 Report Share Posted April 3, 2010 it is either for balancing of the flex plate or for a timing sensor. Link to comment Share on other sites More sharing options...
wheelsup Posted April 3, 2010 Author Report Share Posted April 3, 2010 I think the crankshaft sensor is above that area IIRC, so that would make sense. Link to comment Share on other sites More sharing options...
Rsterns Posted April 3, 2010 Report Share Posted April 3, 2010 So I am slowly taking apart a parts car to learn about our 850's, and have basically zero background knowledge of how cars and engines/transmissions work. On the flywheel there is a gap in the inner ring (circled in red). When I take the flywheel off (to replace the RMS), do I need to make sure this gap is in the same position as it was before I took it off? And what is the reason for this gap in the first place? Anyone know? The ring is part of the crankshaft positioning sensor, which fits in the bell housing top center. The sensor is a magnetic pickup, the ring being a steal, is magnetic. The gap in the ring provides an absence of magnetic material, so now you have generated a pulse that can be electronically measured to provide information related to crankshaft rotation. Link to comment Share on other sites More sharing options...
wheelsup Posted April 4, 2010 Author Report Share Posted April 4, 2010 The ring is part of the crankshaft positioning sensor, which fits in the bell housing top center. The sensor is a magnetic pickup, the ring being a steal, is magnetic. The gap in the ring provides an absence of magnetic material, so now you have generated a pulse that can be electronically measured to provide information related to crankshaft rotation. Makes total sense, and basically the answer to the question of "it needs to be in the same place as when you take it off" . Thanks I appreciate it. Link to comment Share on other sites More sharing options...
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