What is this on my 6cyl in line 165HP?

[YOBE]

Hi,
been working on the engine for a while. Soon a compression test. But then I saw this part on the side of the block. Does anyone have an idea what this is used for?
And should I "adjust" something?

Thx Yorick

 

[Scott Danforth]

block drain for winterizing

 

[YOBE]

block drain for winterizing

You mean a oil-drain? Because I can easily reach the oil-plug in the bottom pan. Meaning I would not need this then?

 

[Scott Danforth]

looking at the rust streaks, it looks like you have a freeze crack in the block already.

 

[Scott Danforth]

You mean a oil-drain? Because I can easily reach the oil-plug in the bottom pan. Meaning I would not need this then?

No, cooling water drain.

you need that item for winterizing to drain the water from the block when the temperatures get to 32 degrees or colder

 

[YOBE]

looking at the rust streaks, it looks like you have a freeze crack in the block already.

View attachment 404013

.... Was just looking at the same thing when I posted the picture.... You think this could be a crack in the engine block? Meaning "total-loss"?

 

[YOBE]

No, cooling water drain.

you need that item for winterizing to drain the water from the block when the temperatures get to 32 degrees or colder

 

[Scott Danforth]

99.9995% probability of a block crack.

post a pick of the source of the rust streaks. most likely a 6-8" crack in the block

 

[YOBE]

No, cooling water drain.

you need that item for winterizing to drain the water from the block when the temperatures get to 32 degrees or colder

Oh... and probably previous owner didn't do..... Bad news...

 

[YOBE]

99.9995% probability of a block crack.

post a pick of the source of the rust streaks. most likely a 6-8" crack in the block

Will try to have a look the coming days.... Could also be located behind the exhaust manifold I guess?

 

[Scott Danforth]

Will try to have a look the coming days.... Could also be located behind the exhaust manifold I guess?

should be about an inch below the head/block joint, under the manifold.

 

[YOBE]

Thanks Scott.
Will see. Could be that the rebuild has ended prematurely....

 

[Scott Danforth]

that is up to you. used running engines from pickup trucks are cheap. the 250 cubic inch motor was used from the early 60's to about 1984

 

[YOBE]

Thanks for the picture!!! Makes it more clear now.
And I presume I would not have detected this with a compression test?

 

[Bondo]

Thanks for the picture!!! Makes it more clear now.
And I presume I would not have detected this with a compression test?

Nope, you'd have to pressurize the block's cooling passages,....

 

[Grub54891]

Mine was like that when I got it. I wire wheeled the area, wiped down with acetone and jb welded it. Before the jb dried I dabbed it with a rag so it looked like cast iron, let dry and painted the area. Can’t tell it was cracked. 7 years and it’s still holding. If there are internal cracks you will get water in the oil. Mine doesn’t. Got lucky.