Guess what's going on in this picture

[jayb]

A friend sent me this picture.  The transmission has been removed, and the picture is taken looking into the back end of the crankshaft.  What do you guys make of that?  I will post the full story a little later...

[drdano]

Super lightened racing crankshaft with Invisi-Journal(tm) technologies?   

[blykins]

Somebody left the cup plug out of the rear of the crank. 

[GJCAT427]

Looks like a piece of the flywheel mount ring broke and the bolt snapped too. Whats the rest of the flywheel look like?

[jayb]

Somebody left the cup plug out of the rear of the crank.

Smarty pants, I should have banned you from responding to this one LOL!  SCAT left the cup plug out.  My friend called them and they said "Oops"!  Motor got installed and then developed a fairly serious leak out the pilot bushing.  No wonder...

[blykins]

It happens.

Some builder who shall remain nameless left one out of the end of a Bryant crank.  Hard to pull vacuum on a crankcase like that. 

[Daveb9]

Called SCAT when this happened. They admitted that it was there screw up. They offered to send me an $.83 frost plug. It arrived today, three weeks later. Needless to say I didn’t wait for it. Back together and runs great.

Dave

[Barry_R]

They caught me by leaving one out once.  Even made it past dyno.  The drive plate used with a DTS dyno snugs right up against the back of the crank and effectively blocks that off.  Pre-oiled when already mounted to the cart.  Did not realize until we dismounted and it drooled on the floor....installed plug and a quick retest just to be safe...

[wowens]

OK, I give up. Since nobody volunteered a answer, what is the thing visible in the hole with gear teeth ?

[70tp]

Rod bolt

[HarleyJack17]

That is what threw me. I knew quick it was a hole in the crank and that was a rod bolt, but what does not make sense to me is "how". The rods are off center of a crank by a good margin so I am scratching my head on how they would show up in the pic through the center of the crank....maybe it is the angle of the picture...new news to me on how they stop that hole up...learn something everyday.

[Falcon67]

It's a thermal inspection port, right below the main port.

[blykins]

It's only on steel cranks that are gundrilled up through the mains. 

[cjshaker]

So how does a gundrilled crank get oil to the rods?