'70 high-compression 460, 75k miles, seems well maintained.
Want to change out the timing chain and sprockets, to get rid of those nylon teeth. Want to change oil pan gasket too.
Check me on this - When putting it back together, put the oil pan up first, then the timing cover? Since the oil pan gasket will be new and goes all the way around. Is this the right order?
What else should I replace while in there? Figured radiator hoses, water pump, timing cover shaft seal, clean off oil pump screen, anything else? Plan on putting a new oil pump in?
When re-installing the timing cover, do I really need to hunt up a timing cover-to-seal alignment tool, to be sure that the cover is positioned correctly? Or is that a stupid question...
I hope you are doing this work with the engine on a stand and not in the vehicle, it will make life alot easier during this repair.
Definitely change those nylon sprocketed gears, make sure you use an early model timing set (I.E. Cloyes 3122) or equivalent.
If you are planning to remove oil pan to fix any oil leaks I would look at a few things inside the engine while it is opened up.
(A). See if old rear main seal needs replacement!!!
(B). Take a connecting rod bearing cap off and look at the bearing surface as well as crankshaft surface, do the same with main bearings. Make sure you put them together the same way they came apart.
(C). I would change the oil pump, it's cheap insurance.
(D). I would put the oil pan on first then the timing cover or else you will have another joint(s) in the pan gasket that will try to leak.
(E). When putting on timing cover just use the crankshaft spacer that goes through the crankshaft seal to align the cover to engine block, thread oil pan to timing cover bolts (finger tight). Install water pump and tighten these bolts as well as the timing cover to engine block bolts before you tighten the oil pan to timing cover bolts and you can be assured of a proper fit. Just remember to use a little silicone in the proper places (your gasket makers should tell you where). There are quite a few other fixes you could do it just depends on if engine is in or out of vehicle. I hope this helps in any way.
Todd
BB79RANCH
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