Hey,

I bought a 5.4 2V core and took it apart. I noticed that the oil pump looked new and that the crank and rod bearings have wear. I think the engine had a oil pressure or oil supply problem in the crank drive.

My question is about one of the oil supply openings in the crank. It seems to be blocked by metal.

Is that metal in the drilling abrasive wear of a rod bearing? Or is it something else that blocked the drilling and caused an oil supply problem?


The other openings are not blocked.

thanks

 

it was oil starved . that crank MUST be cut/cleaned or replaced as it sits it is NOT useable, why it failed? new pump? lots to learn

 

The engine probably burned a little bit of oil and over time it got too low. This caused it to damage the bearings and the crankshaft which caused the engine to have low oil pressure. This is why someone swapped the oil pump out with a new one thinking that it would give it more oil pressure.

The crank is probably fine it just needs to be reground. Also take off the caps on the heads and inspect the cams. These can look a little rough yet work just fine but what you're looking for is one that's burned up.

 

okay, what about that metal blockage? Does that usually happen with an oil pressure situation? rod bearing gets scraped off into the oil supply drilling? Or is that some other metal in there?

 

With no oil supply to cool it the bearing material can get so hot that it melts. When this happens it can get scooped up and block the oil feed hole in the crank. This happens a lot. The crank grinder will use a punch and knock it out of the hole before regrinding the journal.

 

who ever regrinds that crank will also clean it, i'm with dave on pulling the cam bearing caps. but my guess is the cams are also gone, with 50 years of wrenching under my belt i've seen it many times.

 

Nobody said it spun a bearing?
Crank looks usable to me with turning and undersize bearings
Possibly just a polish
Looks like he turned it off quick

 

The first thing to do would be to just leave it in the hot tank over night and then polish the journals to see how they look. The hot tank solution will attack the bearing material and sometimes it can be amazing how much that can help the look of the journals. A few weeks ago I did that for a customer with a 5 cylinder GM engine that had been run out of oil. The crank was just fine after that treatment. I think it its case the rod bearings had stuck to the crank and then spun in the rods. This kept them from doing any real damage to the crankshaft. The rods needed to go to a.002 oversize OD bearing but the journals stayed stock. You just never know.

 

It might be worth looking into a crank kit. A lot of times you can't beat the price. I would check the align bore in the block, also the rod bore sizes.

 

As cheap and the Chinese are making crankshafts and as expensive as a machine shop is, it would be wise to look into the price of a crankshaft.

 

The problem with going that route is that you'd also have to balance the assembly.

 

Still, it's darn near free to research what the prices are.

 

The rods oil from the main bearings, my quess is the mains lost pressure, therefore taking out the rods, that one plugged hole is Babbit from the main.