Crankshaft type?? Engine Rebuild Prep

[Silent909]

I am looking forward to rebuild the 4G63T in January for the Engine Rebuild class I will be taking. At the moment I am taking Machining class to learn the skills to take the next class which is Engine Rebuild. Anyway, in class last week, my professor was talking about crankshafts. That theres different stages to repairing the crankshaft and so forth. My question is does the 4G63T have a cast iron crank or steel? He mentioned if it was cast iron to upgrade to steel. If not it could break under heavy power load. I looked through the forums but all I am seeing are cranks for different blocks. Thanks for the help!

 

[synthetek]

People are making well over 700HP on stock cranks, there no need to upgrade. There are aftermarket billet cranks but they are $600-$2000+

 

[Silent909]

Oh alright, Thanks for the info!

 

[StarionGSX]

Look at the parting lines on the crank. You'll see it as a line on the counterweights. A small parting line is a cast crank (typically 1/4" or smaller). A wide parting line is a forged crank. Use that trick on any manufacturers crank to tell what type it is.

Parting line is a casting term referring to the line where the two mold halves were joined.

 

[Silent909]

Oh thats cool. That will def come in handy. Thanks. I got a question on that lining. would that be the same lining that we would see when we hone a cylinder? Or 2 different types of lines?

 

[synthetek]

Oh thats cool. That will def come in handy. Thanks. I got a question on that lining. would that be the same lining that we would see when we hone a cylinder? Or 2 different types of lines?

No, the casting lines are not the same as the crosshatch from honing a cylinder.

 

[WES_393]

Stock 4g63 cranks are forged steel, and like mentioned are VERY strong compared to most. If you'll be working on your crank, one thing you definitely want to do is pull the plug balls and scrub the crud out of the oil galleys.

 

[Silent909]

No, the casting lines are not the same as the crosshatch from honing a cylinder.

Oh ok thanks I'll note that.

Stock 4g63 cranks are forged steel, and like mentioned are VERY strong compared to most. If you'll be working on your crank, one thing you definitely want to do is pull the plug balls and scrub the crud out of the oil galleys.

Oh no wonder it can withstand a lot more than others ha. Yup will be doing that also. After the rebuild, I would be doing the Trans next.