CK5
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1973 C10 "The Purple Truck"

Basic build
I was waiting for someone to question the nickle in the engine. :pimp: To clarify it's just a scale reference. The first picture I took without the coin I realized it could seem like the pieces were much bigger.
 
Uncovered the timing chain this evening.

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I had my son rotate the flexplate so I could line up the sprocket marks. When he had to switch directions back the other way, I thought the chain was going to fall off on its own!


In this video you can hear the clicking noise I was hearing from outside the engine. And at this point I have the slop in the chain pretty even on both sides after we got the marks lined up.



It was scraping the timing cover a little.

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Uncovered the timing chain this evening.

View attachment 340102

View attachment 340101

I had my son rotate the flexplate so I could line up the sprocket marks. When he had to switch directions back the other way, I thought the chain was going to fall off on its own!


In this video you can hear the clicking noise I was hearing from outside the engine. And at this point I have the slop in the chain pretty even on both sides after we got the marks lined up.



It was scraping the timing cover a little.

View attachment 340103
You do know that slop will go to one side once the engine is running.
I hope you didn't just put it together.
Teeth are almost gone in some places and the chain is stretched so much it could jump.
I am hoping this is just the in progress post?
 
Seems like every small block I took apart had that nylon toothed gear in them, and they were all broken apart.
I wonder how that camshaft has faired over the years, I remember about 76 or so the cams were eating themselves up.
 
Cam, lifters, cam bearings.

When I changed the timing chain of the original engine in my 77, I pulled the block and popped the cam bearings.

Gained 15 psi oil pressure....
 
You do know that slop will go to one side once the engine is running.
I hope you didn't just put it together.
Teeth are almost gone in some places and the chain is stretched so much it could jump.
I am hoping this is just the in progress post?
That's the no progress post with the timing chain that's in the there from the factory. Part of what I find so amazing is the video where I'm fiddling with the magnet on the chain the slop is even and the chain moves that much on both sides. If I put all the tension on one side, the chain moves out to the mounting holes for the timing cover. I have a new double roller to put in its place.

You are bringing up a thought I was pondering. The sloppy chain should have been causing the timing to be retarded some, correct?

I'm amazed I didn't notice anything with the way the engine was running. The only thing I ever did notice was an occasional stutter in the idle, but that was very infrequent.
 
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Under load or cruising, I would think the timing would be fairly stable as the crank is pulling that chain tight against the cam gear which is resisting rotation from having to move the lifters against their 100+ lbs of spring pressure. There is probably only wear marks on one side of the cover?
 
Under load or cruising, I would think the timing would be fairly stable as the crank is pulling that chain tight against the cam gear which is resisting rotation from having to move the lifters against their 100+ lbs of spring pressure. There is probably only wear marks on one side of the cover?
Yes, just the 1 side.
 
it amazes me how that cam sproket is nylon or whatever ungodly material it is made out of.. Glad to see that even with the shrapnel sproket, you seem to have avoided any real damage.

I had a good 11 degrees of play in my chain when i noticed it.. ugly stuff ha
 
it amazes me how that cam sproket is nylon or whatever ungodly material it is made out of.. Glad to see that even with the shrapnel sproket, you seem to have avoided any real damage.

I had a good 11 degrees of play in my chain when i noticed it.. ugly stuff ha
Yeah it's an attempt to silence the chain
 
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