Bosch M pump timing question
Bosch M pump timing question
With the drip timing on the other hand you can see where actual start of injection is if you don't know how the pump builder set the pump. It is more involved though.
I agree with firen456 that the timing should be 16-20 deg Before TDC. Stock is 24 deg BTDC AFAIK, with bigger elements you want to go slightly retarded.
Search google for W115/om616 injection timing, there is a peachparts thread explaining drip timing in detail. Note that you will need the 31 tooth delivery valve socket to remove the delivery valve, as well as a manual inline primer pump retrofitted. Pay attention to delivery valve torque spec when you tighten it, the pump is quite delicate.
https://www.youtube.com/watch?v=neukRJ4olz0
In my opinion i would only do the drip method if i couldn't find the sweet spot with the standard timing pin method.
Note that the timing pin in the pump has little to do with actual injection timing. With the timing pin timing is 14 after TDC, but that timing pin could be set anywhere depending on how the pump builder built the pump, the flyweight carrier can be rotated. Why Mercedes decided to use 14 ATDC is beyond me, it could be any arbitrary number.
With the drip timing on the other hand you can see where actual start of injection is if you don't know how the pump builder set the pump. It is more involved though.
I agree with firen456 that the timing should be 16-20 deg Before TDC. Stock is 24 deg BTDC AFAIK, with bigger elements you want to go slightly retarded.
Search google for W115/om616 injection timing, there is a peachparts thread explaining drip timing in detail. Note that you will need the 31 tooth delivery valve socket to remove the delivery valve, as well as a manual inline primer pump retrofitted. Pay attention to delivery valve torque spec when you tighten it, the pump is quite delicate.
https://www.youtube.com/watch?v=neukRJ4olz0
In my opinion i would only do the drip method if i couldn't find the sweet spot with the standard timing pin method.
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