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Jim, I'm somewhat embarrassed for having not mentioned that myself.speakrdude said:Check to see if the pin in the distributor gear is still there or sheared off
When i crank the motor, the rotor is not turning. I pulled out the distributor and it moves freely. what is my problem here? Am i going to have to check inside the motor now? How do i do this? I am assuming the gear must be damaged?? Whats my first step here?
Check that pin holding the dissy gear on. (It may still be in there and gear seems solid, but it still may be broken and gear may turn on shaft with a little effort).
Good point.
If it's good, then pull the plugs and valve cover, set the timing mark to Top Dead Center ("0" degrees),
Since his distributor is not turning, I think that he could forgo this step.
checking to see it if the valves open and close while you turn engine over by hand.
Agreed. This will tell him much more.
If the valves don't move, cam isn't turning and the timing chain / gears are gone.
Either that, or the crankshaft sprocket key has been sheared off.
If the valves do move, see if the #1 cylinder has both valves closed (Note: If valves are not closed, could be 180 degrees out, so turn engine by hand one full rotation till TDC again and recheck). If both valves on #1 not closed in either TDC, cam timing is kaput and major surgery is instore to check the cam drive chain / gears.
No disagreement, but again, he is not seeing any distributor shaft rotation.
The Mercruiser Engineers designed this engine to drive the engine circulating pump impeller from the front of the camshaft.What impeller are you refering to????????????
The Mercruiser Engineers designed this engine to drive the engine circulating pump impeller from the front of the camshaft.
In this photo, the next item to be installed will be a cover.
This cover seperates the oil wet area of the timing chain from the ethylene glycol side of the cooling system.
A special and problematic seal keeps oil AFT of this area, and E/G FWD of this area.
The impeller installs on the front end of the camshaft.
Kghost, there was no offense intended with my explanation.FYI, I am not the one who needs a lesson in merc 470 design just so ya know, Been there done that soup to nuts on these many times.
My question was to the original poster.
It may not be that simple.Aftet removal i found the keyway out of place and not in the slot on the gear. Now to order the parts and find my next problem.