Hi all -
This may have been addressed before so please bear with me for the long post, I could not find the same issue in a previous thread that had a resolution.
I had to replace my oil pan last Spring and when I was at it, I had a look at my timing chain from below. It looked pretty sloppy with a lot of slack on the fuel pump side. I was surprised seeing this, because about 25K miles ago, I had a local restoration shop replace it because it had more than 1/2" deflection reaching through the fuel pump mounting boss. Shop manual said that is the limit for deflection of the chain.
I didn't know as much as I do now and had asked the shop to install a double roller timing chain set. They called me and told me it was not possible because of the hatchet counterweight requiring a narrower crank sprocket. They said they would have to install set with a "regular width" chain. So, that's what they said they did. I saw the hatchet weight there when I changed out my oil pan so I presumed they did what they say they did. The restoration shop no longer exists of course.
Now I'm wondering, would the chain have stretched that much after only 25K miles? Yes, I get on it once in awhile, but not that often. I'm wondering now if they even did the job they said they did. I took them at their word and never checked.
I've attached a snap of my timing marks and pointer. The space between 12 BTDC and where the pointer is (at about 4 BTDC) is how much I can rotate the crank before the distributor rotor begins to move. I understand the limit should be about 6 degrees whereas mine appears to be 8 degrees. That seems to also confirm that I should change my chain. I also included a snap of the front crank area showing the chain and hatchet counterweight although you can't see the slack in my chain from the angle of the picture.
What I'm wondering, if I can figure out what chain to buy that is, can I just replace the chain and retain the existing sprockets? I have no idea what chain to buy and would like some advice if possible. I understand that for pre-66 engines (mine is 1965 six bolt) the change level is good info to have handy. Unfortunately, my engine tag is missing but I can provide the engine build date off the block boss in front of the LH cylinder head - 5F15P. That translates to June 15, 1965. I don't know what the "P" signifies.
Also, if it helps, the VIN stamp on the block is 5F07K778037. Not sure if this will tell you the change level.
Any help steering me in the right direction to get this sloppy chain addressed is greatly appreciated.