1959 Cj5 F134 Engine Knock

Connecting rod bearing. As you can see in the picture the lock nut came loose and backed all the way off...that was how far the main nut was backed off when I dropped the pan...
hopefully it is salvageable with a new bearing and some love

 

I agree with Walt.

If it is savable, you need to re-torque all the bolts and nuts.

 

That end of the crank seems to be discolored........plus what's left of the bearing seems to be hanging out the sides.............Might not be good.

 

I agree that it would be fine, too, but I just wanted to make sure the numbers I was seeing were good. I do know that the 2-bbl Weber made the engine come alive. That single barrel Solex was a piece of crap. Have a great 4th ok? Today was Friday for me at work, and I don't go back until Wed., next week. Maybe I will get time to get the new brake shoes on my Jeep and get it back on the road.

 

I hate to say it, but you're in for a regrind of your crankshaft and a new or rebuilt rod. Your rod journal on the crank is going to be badly scored.
It makes me wonder how that engine was assembled because a properly torqued rod nut just doesn't come loose like that one did.
- Donny

 

That is why I said to re-torque all the nuts and bolts.

 

There is a lot more willys experience on this forum than what I have but I hav had a couple of fhead engines with connecting rod problems. When I was younger I had a machinist assemble my long block for me and it seized minutes into engine break in due to not putting connecting rod caps in proper orientation. I had someone else regained crank only and I put things together and was fine. On another Fhead years later I found a machinist with a lot more experience with these engines and he did a really nice job resizing a set of connecting rods for me. These engines don't have bullet proof rods is what I have been told. My 2 cents is some real love from a good machinist. Yes nice looking jeep you have there !

 

Appreciate all the advice guys! Having a a guy check the crank and give his opinion next week. It's not horribly scored...was hoping for some optimistic vibes so I can get away with polishing up the crank and enjoying the rest of my short summer.

 

I tend to agree. Your disaster may have happened quite quickly, with limited wear. Check for out-of-round, etc, and try out a set of bearings with some plastigage.

A lot will depend on how fast and how far you intend to drive your jeep.

 

Did you pull the crank?..........Pictures? Doubtful that any meaningful repair can be done while still in the block...........polishing would be very optimistic , but you may get Lucky!

 

I would be more concerned with an egg shape connecting rod at this point. Yes crank damm tuff

 

The cj3b page has good Fhead write up hear is a pic. I'm not saying I know what the problem is but this is easy to screw up if you don't stamp em.

 

Had to go through a few rods to get ones that would be servicable if you care about the side play spec. Yes a lot of stuff will run fine anyway. There is a nice blue color on that crank now.

 

Got everything back up and running, I appreciate all of the info you guys provided! Took it for a 50 mile drive and guess what...developed a leak which I believe is coming from the transfer case. Thought it was coming from the oil pan since the leak is dripping from the from the bottom of the transfer case right there. Haven't had much of a chance to investigate much further, hoping to explore more this weekend.

 

Wait… what was the fix for the rod bearing???

 

What he said.........

 

It sounds like a couple of us are curious if the journal polished out, or required regrinding the crank/rebuilt rod was the fix.
Glad you got it back on the road!
-Donny

 

I was able to get it polished out, luckly there were no major marks in the crank so it polished out with much effort. Mic'ed it to confirm no high spots and slapped it back together. I've ran a little over a tank of fuel through it with no issues, so I'm feeling confident everything is good to go.

 

Lucky man. And a good old jeep.