Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 07-16-2017, 02:12 AM   #1
Chuck Sea/Tac
Senior Member
 
Chuck Sea/Tac's Avatar
 
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,351
Default Block cracks

Other than the top of the block, where are the common cracks found, when checking a block for rebuilding. I am using a block tester at 40#s.
Chuck Sea/Tac is offline   Reply With Quote
Old 07-16-2017, 05:41 AM   #2
Tom Wesenberg
Senior Member
 
Tom Wesenberg's Avatar
 
Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
Default Re: Block cracks

40# sure sounds high, especially for an unpressurized system. I bought a block at an auction 20 years ago, but when I got it home I found a crack in the valve chamber, near the center.
Attached Images
File Type: jpg Crack in Valve Chamber.jpg (82.1 KB, 77 views)
Tom Wesenberg is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-16-2017, 08:58 AM   #3
100IH
Senior Member
 
Join Date: Dec 2011
Location: SW Idaho
Posts: 970
Default Re: Block cracks

Are you saying 40# of air pressure in a bare block on the stand and using good soap / bubble mix in a spray bottle. If there is a crack that leaks, you'll find it.
100IH is offline   Reply With Quote
Old 07-16-2017, 01:47 PM   #4
Chuck Sea/Tac
Senior Member
 
Chuck Sea/Tac's Avatar
 
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,351
Default Re: Block cracks

Yes, that's what the instructions say for pressurizing a bare block. It works great. So far I e tested 4 different blocks overnite and they all held. In fact the only leaks I've found were in the nipple to gauge connections.
Attached Images
File Type: jpg image.jpg (77.6 KB, 24 views)
Chuck Sea/Tac is offline   Reply With Quote
Old 07-16-2017, 02:16 PM   #5
darrylkmc
Senior Member
 
darrylkmc's Avatar
 
Join Date: Nov 2010
Location: Fairbanks, Alaska
Posts: 767
Default Block cracks

Chuck,

Look at the water jacket areas at the front and Inlet side of the block. Attached is a photo of a front repair l made on a freeze crack on a Model B engine more than thirty years ago.

At the time l used 1/8" solid brass pipe plugs, since that time Pete has changed my thinking to the use of solid Cast Iron pipe plugs.

Hope this helps.

Darryl in a beautiful Fairbanks
Attached Images
File Type: jpg user9967_pic9586_1314048836.jpg (27.8 KB, 79 views)
darrylkmc is offline   Reply With Quote
Old 07-16-2017, 02:30 PM   #6
Kohnke Rebabbitting
Senior Member
 
Join Date: May 2010
Location: 60615,330th Ave.,Clare, Iowa, 50524
Posts: 1,457
Default Re: Block cracks

Sponsored Links (Register now to hide all advertisements)
Quote:
Originally Posted by Tom Wesenberg View Post
40# sure sounds high, especially for an unpressurized system. I bought a block at an auction 20 years ago, but when I got it home I found a crack in the valve chamber, near the center.
Some Model T's crack there also .

Herm.
Kohnke Rebabbitting is offline   Reply With Quote
Old 07-16-2017, 02:45 PM   #7
Kohnke Rebabbitting
Senior Member
 
Join Date: May 2010
Location: 60615,330th Ave.,Clare, Iowa, 50524
Posts: 1,457
Default Re: Block cracks

Quote:
Originally Posted by 100IH View Post
Are you saying 40# of air pressure in a bare block on the stand and using good soap / bubble mix in a spray bottle. If there is a crack that leaks, you'll find it.

Many a crack are old ones, and don't leak, because of rust and old crack sealer. Block should be free of all rust, just to find a crack that will not leak under pressure testing.

After a block is boiled out, the block should be made sure that it is dry, as water in a crack will not show up a crack with a dry magnaflux.


Herm.
Kohnke Rebabbitting is offline   Reply With Quote
Old 07-16-2017, 04:04 PM   #8
Gunmetal blue2
Senior Member
 
Gunmetal blue2's Avatar
 
Join Date: Apr 2013
Location: Columbia, TN.38401
Posts: 422
Default Re: Block cracks

your block can be welded if you take it to the right person that knows what they are doing. We have welded high performance engines and they hold to gether.
Gunmetal blue2 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 07:15 PM.