Okay, I have a stamped oil pan on my lude right now, but I stripped out the drain bolt threads & installed an oversized plug bolt temporarily. Today in the mail, I recieved a new oil pan I won on ebay, but it is a cast oil pan.... w/ a long crack (probly 6 inches long) in the very bottom of it, due to the previous owner hitting a speedbump or something. First question, Would it be wort it to take this pan to a welding shop & have them just run a bead over the crack on the inside of the pan? The metal hasn't seperated at all, but it's definately a hairline crack. Then, are there any advantages to a cast pan over a stamped? and lastly, what years of lude came from the factory w/ a cast pan?? 5th gens??

 

It's not worth it to weld cast metal. It will most likely crack again.

The main advantages of a stamped pan is that it is cheaper to make and is stronger then a cast part.

 

Why would it crack if I didn't hit anything else w/ it?

 

Cast metal can be sensitive to temperature like that. My thoughts on cast parts:

Once cracked, always cracked.

You can try a weld fix, but if it cracks again on the highway and you loose all your oil, your engine is toast.

 

ALL 5th gens came with stamped/formed pans from the factory. The steel pan is much more forgiving than a cast one. If you insist on having the cast one-take it to a certified welding shop that can do TIG on botht he inside and outside.
Another thing-make sure that the shape of the 2 pans is identical. It is possible that the cast one will require a different pickup for the oil pump. This is the case with Moroso pans, which are designed more for the track than street use.

 

The cast pan was shipped w/ a new oil pickup. I'm still confused on what car this thing came off of, though....It 5th gens all had stamped, and both 4th gens i've had were stamped, when did they put cast ones on??

 

I have no idea, I've never even seen a cast oil pan on any car I've ever worked on. It makes a lot more sense to stamp that part.

 

i have a 4th gen that is stamped and a 5th gen that is cast

 

i dont think honda made ANY cast h series oil pans.
in fact i dont think honda made any cast pans PERIOD.

~kris