Bern
Well-known Member
- Location
- Mount Vernon, WA
Just when I thought I had most of the mysteries in life figured out, this pops up...
I've got my 6000 diesel engine completely torn down. I'm cleaning up the block right now in preparation for new rings, bearings, etc. As part of the normal cleaning process I pop out all of the cup plugs. 2 of them opened up a dark cave that has me a little baffled.
In the back of the block there is an oil drainback passage that is plugged with 2 plugs, one on the side and one in the back, shown with the red arrows. The one on the LH side of the block is pretty much blocked by the starter in normal operation. Inside the hole there is a threaded boss, like the hole was designed to accept some sort of a device that was retained by a center bolt, much like a canister oil filter is held on.
Anyway, I can't think of what the engineers at Ford had in mind for that hole. Even though the block is similar to a 172 block, I don't ever recall seeing that hole present in the 4-banger. It is most definitely NOT a coolant passage - there was a lot of sludgy oil back in that area. Any thoughts from the old guys here?
I've got my 6000 diesel engine completely torn down. I'm cleaning up the block right now in preparation for new rings, bearings, etc. As part of the normal cleaning process I pop out all of the cup plugs. 2 of them opened up a dark cave that has me a little baffled.
In the back of the block there is an oil drainback passage that is plugged with 2 plugs, one on the side and one in the back, shown with the red arrows. The one on the LH side of the block is pretty much blocked by the starter in normal operation. Inside the hole there is a threaded boss, like the hole was designed to accept some sort of a device that was retained by a center bolt, much like a canister oil filter is held on.
Anyway, I can't think of what the engineers at Ford had in mind for that hole. Even though the block is similar to a 172 block, I don't ever recall seeing that hole present in the 4-banger. It is most definitely NOT a coolant passage - there was a lot of sludgy oil back in that area. Any thoughts from the old guys here?
