Hello friends! It’s been a while since I’ve visited this page. Last I left I had spoke about my late grandpa’s Cadillac that I planned on “restoring”, which really meant getting back on the road. That was in 2017. A lot has happened since then. The engine turned over which was already more than I was hoping for. I put in a new gas tank, sending unit, and fuel pump. I got it to start and run! I did however, find out why my grandpa parked it. There’s quite the knock coming from the back half of the motor. Last year I was getting ready to dive into what it could be when my mother got sick, grandpa’s daughter. That put a hold on grandpa’s Cadillac. Ultimately she past away last year. Now I’m more motivated than before to get this project on the road. I’m getting ready to pull the motor and tranny. Any advice would be greatly appreciated. I won’t spend so much time away this time around.

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A series of photos will help you put things back where they belong in the future  ( depending on how long that might be ) 

I would not run the engine any more until you have it out and look into the internal  knocking problem to not be causing additional possible internal damage to it 

If doing a lot of work yourself a good machine shops advice and worked performed by them  will be a very big help to get it all correct and back together in good condition ( to stock specs or as close as is possible ) 


Thank you for the kind advice, T&G. I did start taking pictures. I had only ran the engine maybe 3 times. Once for my sister and mom and twice to see if my father-in-law could help diagnose the issue. He suggested removing the oil pan and getting a look at the bearings. I have since moved to a house with a bigger garage. So now that I have space, I figured I’d just pull the engine/tranny. I have talked to some friends and they have recommended a good machine shop that has some great reviews. Do you have any advice on rebuild kits? Or parts companies with good reviews?


A lot of info on this site  is in the home page header 

Suppliers -Help - and at the top right you will see a - Search 

All posts go into a library for future reference for many years on this site 

Recommend asking one question at a time so all info is based on the subject asked 


As you know the engine needs some low end  repair issues  so I think I would just pull the engine and repair what that needs for now 

The trans may be just fine and work for a good while after the engine is fixed and replaced but you will not know the condition of the trans until you can drive the car 

Will be more labor intensive to do it that way but could save you the expensive cost of rebuilding a trans that does not need it and apply you skills to the next issue needed to get the car road worthy ( Brakes maybe ?) 

How many miles on the car now ? 

Jason Edge who is the web master here and one of the very best authorities on the subject of our two year of  Antique Cadillacs did a complete rebuild on his 64 429 that will be a wealth of info from soup to nuts regarding tips procedures and rebuild parts new or used for our Cadillacs 
Jason and Russ are our two major part suppliers on this site for our cars 

Most parts and good advice you will need are available right here  on this site 

Welcome to the world of restoring a 63-64 Classic Antique Cadillac ! 

You are in good company with those who live and breath our year Cadillacs ( The best year Cadillac ever made in my own opinion ) 


So, I broke down the engine last night and found that the rod bearings were stacked on top of one another. There were two grinding away on one side and none on the other. But on a good note, there’s no scarring, gouging or signs of wear. 

If there was no significant scratching or abrasion on the rod journals due to the rod bearing failure, you got lucky. If there is deep scratching, etc they will need to be reground and new undersized rod bearings used. If only minor scratching can just be polished. 

if your crank isn't destroyed after that, buy lottery tickets, because you're the luckiest man on the planet.

I would not just slap new bearings in, you need to have the rods checked now, if there was enough room to have a bearing spin, then it's at least a 90% probability that that rod's bore is oblong from the hammering it took.   You won't necessarily need to replace the rod, but you need to take it to a machinist who can check the runout, grind the faces then hone the bores out.  It isn't a very long operation, but you need to do it when you see this.  


Enjoying my education on the subject

That bearing is toast !


I have never seen a spun bearing on one of our engines on this site since 2006 and on the site daily since then 

So surprised by this


Thank you all for your thoughts. After talking with my father-in-law, I’ve decided to make sure I get it checked out with the local machine shop. There is a date stamp on the next bearing indicating it was rebuilt in ‘87.

I don’t think a lottery ticket will be in my future. It doesn’t look good. Does anybody know where to get a good crankshaft? This might be beyond machining. 



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