["QUICK-SILVER"]

Originally Posted by Pronto Poncho

Great Question !

We talked about that in length and could not come up with a really good answer.

A little background on what we did. We did the following: Installed another oil pump, oil shaft and distributer. The results were the same, still tapping ! We also checked the oil drive shaft for damage or out or centric. Other than the witness marks all checked out ok. I am willing to believe the initial marks were made because of the bad bushing in the distributer. But why only on part of the shaft ?

Was the slot dead center of the shaft?

This one pic "looks like" it had some ear spread on the right side. If so, that would have pushed the opposite side, where the ware is, closer to the guide hole.



Clay

[Pronto Poncho]

Originally Posted by "QUICK-SILVER"

Was the slot dead center of the shaft?

This one pic "looks like" it had some ear spread on the right side. If so, that would have pushed the opposite side, where the ware is, closer to the guide hole.

Clay

Thanks Clay,

If you get an opportunity look at the video posted last weekend. You can see that there is no irregular movement then. I would speculate that the marks happened at a higher RPM during the first Pulls on the first Dyno runs before Joe received the motor. That was when the bushing in the distributer was bad.

Just a reminder to everyone: This may not be discussed on the thread enough but please Remember:

When Paul did the first Dyno on the motor it had a major failure from oil starvation which resulted in wiping out the bottom end of the motor. Can't say for sure but if I understand correctly he only replaced the crank rods and bearings. I sometimes wonder if this somehow is connected to our tapping problem ?

[Shiny]

Originally Posted by "QUICK-SILVER"

Was the slot dead center of the shaft?

This one pic "looks like" it had some ear spread on the right side. If so, that would have pushed the opposite side, where the ware is, closer to the guide hole.
Clay

This is a good hypothesis.

Another speculation - may also be just natural movement of rod relative to pin? If the worn spot is normal to the slot and there is a natural CG or inertial pull to one side, the rod may just slide sideways on the pin ???

[Va68goat]

STEELCITYFIREBIRD,

grivera just called me and told me to take a look at your last post and my quote. I forgot all about that post regarding the 150 reading on the compression test that we took last year. It took me a while to find it but it's post# 206 and dated 9/16/2018. That compression test was with the plugs out, engine warm, strong battery, 3 cranks and what was reported as a good gauge because it had been recently used and confirmed prior to being used for my test. That compression test read 150 across the board. I don't know if its where it needs to be or not but that is where it read on 9/16/2018. Is that anything to be concerned about or could cause a knock?

[STEELCITYFIREBIRD]

Hope you boys are able to get a timely, fair and viable resolution to this.
This thread is a close third in all time views in the street section, at 51,000 and counting!

[Steve C.]

https://pics.me.me/carnac-the-magnif...n-46163017.png



.

[MarkS57]

I have to say a mechanical knock is a knock. Myself, I was distracted by the distributor bushing and the pump drive shaft. While I'm not totally discounting that, it might be that when Paul saw the distributor issue, he might have thought ah-ha, that's it- when it might be and it seems to be, something completely separate from the distributor. So there could well be two problems with this engine the first time around.
Anyway, have you made any progress with identifying a nearby shop to help out?

[Va68goat]

Formulas,
Yeah..thats going to be addressed the next time we work on the motor. By then we'll have a new compression test gauge as well so we can take care of a few things that need to be addressed. Appreciate the info!