more theories. Post edited.December 11 2011 at 10:20 AM
Fordmech (Login F0rdmech)
from IP address 22.214.171.124
Response to Ok, I'll do that
I am editing these recent posts because the reference to worm drive is incorrect
and misleading, These are a helical gear set, sorry I got off track, trying to help out.
I keep thinking about the heavy wear on half the gear and not on the other half.
I posted about the cam walk theory and constant oscillation but I guess I'm not real comfortable with it. It seems such a wild theory that the cam would be oscillating violently back and forth. There is nothing to back it up. It seems there would be many parts torn up if that were happening.
I'm not saying it might not be walking. You seem to have shown you have 30 to 40 mils there. So I'll just say I don't know why the gears are worn on one half more than the other.
Here is another theory to ponder: Tell me what you think. The cam gear and dizzy gear are necessarily cut at angles to one another. These angles generate large forces in particular directions as the gears drive the oil pump. The dizzy gear is forced down into the block stop. I think we all know that much. The cam is driven back towards the rear of the engine. The thrust is taken at the cam retainer plate and cam gear thrust surface. Do you buy that? Do I have these directions correct? If we can believe the cam gear (due to constant oil pump load) spends most of it's time up against the thrust plate then it seems that your cam was shifted back 30 to 40 mils and out of position relative to the dizzy gear most of the time. The oil pump provides a pretty constant load that would seem to make this theory believable. Can you buy it to this point? Now the part that needs some verification.
What should the contact pattern look like? Still trying to figure that out!
|This message has been edited by F0rdmech from IP address 126.96.36.199 on Dec 11, 2011 2:47 PM|
This message has been edited by F0rdmech from IP address 188.8.131.52 on Dec 11, 2011 2:39 PM
This message has been edited by F0rdmech from IP address 184.108.40.206 on Dec 11, 2011 2:36 PM