Crankshaft and thrust bearing mating

[eoddunn]

Good afternoon, I am new to this forum and use it as a reference for working on my 200 that I have put into my 61 falcon. One of the rods started knocking on the motor so I pulled it apart and found out that the torque converter was not seat fully in the trans so it had put too much forward pressure on my crank and wore out my thrust bearing and a couple rod bearings.

I have attached a photo and would like some advice. I have rebuilt some chevy and Ford small blocks but never a small inline Ford. I am not sure if the crank should have the bevel in it where the thrust bearing goes or not? I figured it should be a flat surface like a sbf. I am hoping I do not have to replace the crank.

Thanks in advance for any help!

 

[fast64ranchero]

It should be flat like a SBF, that crank is junk.

 

[bubba22349]

X2 Yep sorry but that crankshaft is done! It could maybe be turned in as a Core or repaired, they used to weld to them up and re-grind them all the time. Otherwise it should be replaced with another crank. Good luck on your build

 

[Econoline]

It really ate in there. Thanks for posting that

 

[CNC-Dude]

It's not uncommon for complete machine shops to make weld repairs to journals and thrust flanges. If you have a good shop in your area, you may see if they can do it if you have problems finding a replacement. Most all auto parts stores that sell crank kits are selling you cranks that have been weld repaired and reground also, many times they weld up over cracked radii without any concern for it other than it making it past their 30 day warranty. I've seen many cranks with journals on all the mains and rods welded and made back to standard. Its not uncommon at all.

 

[chad]

...Its not uncommon at all.

How reliable @ 5K rpm?
Depends on shop…?

 

[B RON CO]

Hi, X2, how in the world did you have oil pressure? You know it is rebuild time. Get the Falcon Performance Handbook and get the most out of your Ford 6. If you are near me on Long Island I'll sell you a nice 200 short blockfor less than the bearings will cost you. Good luck

 

[B RON CO]

Hi, don't forget your rods. I'll bet they are "out of round" Good luck

 

[CNC-Dude]

...Its not uncommon at all.

How reliable @ 5K rpm?
Depends on shop…?

I built a "496" stroker 454 street/strip engine in the mid 80's before you could buy a crank from Eagle or Scat and anyone else for that matter, that was welded to stroke a 1/4". I ran it for 3 or 4 years regularly at the dragstrip with nitrous and drove it on the street a whole lot. It was a stick car with slicks and I shifted it at 7000 RPM. Nitrous was only a 125 HP kit. Never had one minute of problems. Sold the engine to a friend and he put it in his street car and drove it a lot harder than I did and never had a problem. A welded crank just isn't as "dicey" of a thing as it sounds. Someone that doesn't know what they are doing of course can make a good thing into a bad thing real quick though.

 

[chad]

Thanks.
So "quite reliabel/durable".

Any referals for national or local work to your own crank?

 

[CNC-Dude]

I don't have any experience using cast cranks for performance mods that have been welded, only for stock applications. Welded steel cranks for either street or performance is shown to be fine by other people as well. Any performance minded machine shop that can weld or repair cranks might be suitable for your needs, but i'd ask them for input on what they have done.

 

[chad]

OK, thanks.

So eoddunn, whaddaya think,
got nother crank? Wanna try this?
Do some cost comparisons?

 

[eoddunn]

Thanks everyone for the help! It took a little bit for me to ask for help as I am new to the Ford small sixes and didn't wanna sound like and idiot.

I ended up picking up a 81 long block that had been rebuilt but never fired for $150. I pulled all the bearings and the crank and dropped them in my engine (65 block which I have to stay with because of the small bell I have). Used plastigauge on it and it mic'd perfect. So now I have a brand new stock cam and an 81 head for future projects or if someone ends up needing it.

 

[chad]

great price/condition.
C if the head was done in the CI/ford6 style…if not may B get on it for later and swap over in a day!
What will U do w/the rest of the motor (the majority of it if U ask me...