Working on a 2002 Mercury 90. 4-stroke, carbureted. Having difficulties getting fuel into the cylinders as expressed in another thread.
This question is about the flywheel. When the cam shafts and crank are aligned for TDC of the top cylinder, the timing marks on the flywheel are nowhere close to the index mark on the casting. I've taken a picture to try to show you. The factory timing marks are on the ring gear beneath the pull-starter-cord sheave. They are not visible in a picture so I humbly marked them on the sheave; factory TDC with a range of +30 to -10, and the opposing factory TDC. In addition I marked the true TDC of the top cylinder, the location where cylinders 1 and 4 fire and 2 and 3 fire. They are nowhere near the factory timing marks.
The flywheel is a riveted assembly so it is not like an assembly error of 60 degrees or the like.
Tell me this is not the original flywheel for the engine....
The engine will run but you have no chance of using the factory marks to verify ignition function. There is no adjustment for advance.
Should I expect the function to be acceptable?
Thank you,
J
This question is about the flywheel. When the cam shafts and crank are aligned for TDC of the top cylinder, the timing marks on the flywheel are nowhere close to the index mark on the casting. I've taken a picture to try to show you. The factory timing marks are on the ring gear beneath the pull-starter-cord sheave. They are not visible in a picture so I humbly marked them on the sheave; factory TDC with a range of +30 to -10, and the opposing factory TDC. In addition I marked the true TDC of the top cylinder, the location where cylinders 1 and 4 fire and 2 and 3 fire. They are nowhere near the factory timing marks.
The flywheel is a riveted assembly so it is not like an assembly error of 60 degrees or the like.
Tell me this is not the original flywheel for the engine....
The engine will run but you have no chance of using the factory marks to verify ignition function. There is no adjustment for advance.
Should I expect the function to be acceptable?
Thank you,
J
