Can anyone tell me what the large round hole is in the crankcase? This is located in front of the dip pan, just about in-line with where the large timing gear would be. Please see the photo. Thanks!
It's to remove the crank pin
Also used to facilitate in removing fan driven pulley pin.
You're both right. It was put there to remove the crank pulley pin, but it also serves as an oil drain on most T's.
Thanks. I might need a part number for the plug also...
There's no plug.
If there's no plug, what goes in the hole?
Wine bottle cork, if you think you need a plug.
If you plug the hole, the oil that seeps out of the front "seal" can't drip out.
It's just a drain hole. Also a hole to drain any water that may splash or drip there.
So the hole should be left unplugged so that oil can leak out, as it should? Am I missing something? I'm relatively new here, and I understand there's no oil pressure, but this doesn't make sense to me yet. Thanks for your patience; I'm trying to learn.
The hole is there so you drive the down thought the hole or put your punch in the hole and drive the pin up.
All T's seep a little oil out of the timer/camshaft seal and the front crankshaft seal. I shouldn't say all but with the felt seals it's a common phenomenon. And sometimes you might spill oil or coolant.
Mostly the hole is to aid in getting the pin out of the front crankshaft pulley.
Ok, so the oil level in the crankcase will not be high enough to flow into the front of the pan and leak out the hole, even going down a steep grade< Either that, or there's a baffle in the pan that keeps the oil from moving forward on grades? Don't have the pan with me, so I can't check it. Thanks again.
Another example of lightening holes:
Hank Becker's Long Beach Model T Hillclimb car.
Magnetize a small juice can and pop it onto the hole from below. When it's full pour it back into the motor. In the immortal words of Foghorn Leghorn: " Thas' a joke, I say thas' a joke son".
Reading David's queries, I think he is under the illusion that the hole is within the crankcase area, thinking it is below the timing gear. It's well in front of the timing gear, out in front of the front crank oil seal. Open to fresh air both top and bottom.
Say David, I see that you have a case of Quaker State oil. Dont you like good oil? Scott
That is a verry rare factory raceing pan,
Worth a lot of money.
Also drain for coolant which leaks front of head gasket or water outlet or upper hose If you don't have any leaks fine! There shouldn't be any leaks anyway! but you all know Model T's!
Thanks for all the info. As I said, I'm new so I appreciate the education.
Robert - That's actually a 30+ year old box of QS oil. My dad bought it by the case.
Kenny - I wasn't aware that the pan was anything other than stock. How can you tell the difference?
Looking at the other side of the pan, is there a dam on the back side of that hole? If not there should be. The hole is on the dry side or front side of the dam/engine front main seal.
Thanks, Jim. I don't have the pan with me to check; it's with my brother in central NY and I'm in Dayton, OH. I'm sure the dam is there. Kenny said it was a "factory racing pan"? How can you tell this one from stock?
I put a plastic black spray paint cap under the "HOLE" with two small springs that clip it in place. This catches the oil drops and is easy to remove. No one has ever noticed it yet.
David -- Kenny was joking about the racing pan.