Anyone know how these casting holes were factory sealed.
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I had a couple like what you show on the side of the cylinder. I think they are just air pockets that don't go all the way through, but I sandblasted mine and filled them with JB Weld.
I'm not sure what you have in the lower cooling chamber, but I'd do the same repair there. -
If you look carefully, you see these slightly offset towards the middle of the block, from the water holes in the top off the block. They are on several model a blocks I have. Not on the B block I have. These, on this block, are sticking out and peeling a little. Others are hard to see and blended against the block wall. They are definitely a factory thing. For what purpose, I don't know.there are two equal distance from the water inlet. I pressure tested this block, and it doesn't leak.Comment
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I wonder if they are pour or vent holes for the casting process? I'll have to look at my block. If they are pour of vent holes, then they are solid cast and nothing to worry about.Comment
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My block stamped with a serial number I've been told would have been 1/3/29 is smooth in those areas. I wonder if that was something they changed in later production.Comment
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Those marks are from chaplets. They are used to support sand cores in relation to the mold and prevent drift. Most chaplets for iron castings are made of mild steel and tin plated. They fuse into the iron casting wall, leaving marks on the casting surfaces. Both core design and changes in foundry production practice will account for their placement and use (or not).
fig036.jpg motor-chaplets.jpg
Mechanical engineering 101: If you put an adjustment knob, screw, bolt, or tolerance specs on something, some people will immediately fiddle with it. If you mark it DO NOT TOUCH everyone will mess with it.
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Thanks for the explanation and picture.Comment
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1: Do I have to worry about the hairline crack on each side of the stud?
2: Do those holes mean that my crankshaft is balanced? I have 2 holes in the back and 1 upfront?
...12-14-2019, 06:30 PM -
Haven't seen any info on Tod's A block casting project lately, anyone know what the story is?03-19-2019, 10:01 AM -
I have a cracked block left side of engine leaking water . May try Blue Devil Block sealer . Any other suggestions other than a new block. I used it last year for a sand hole casting leak in the valve adjusting chamber worked out good so far over 2000 miles on that repair .08-27-2017, 12:29 PM -
Is there a reason the two small water holes between cyl 2 and cyl 3 would be blocked in both the Snyder 6:1 head and the A block? The B gasket sold for this head by Snyder has the holes open....05-28-2017, 07:30 PM -
#1 cleaning the block and crankshaft, #2 deburring the block, than clean it again, #3 follow the guidelines to a tee, #4 double check all that you do. I cant say enough how important cleaning and deburring is....01-16-2023, 06:48 PM -
I want to drain the radiator and engine block cooling fluid. I must be blind. I see no petcock on the radiator and none on the engine block. Engine is 1937 60 HP. On the block shouldn’t there be two? One for each bank?
Will one of you point out where to find these petcocks please?...11-06-2018, 05:44 PM -
Anybody know the weight of a short block with crankshaft and pistons and rods?
Thanks 🙏...08-01-2022, 11:30 PM -
How careful should I be in cleaning the engine block surface after pulling the head? do I need to keep all debris out of water jackets, cylinders, etc.?05-06-2018, 09:32 AM -
Does anyone know if the Burtz block and cam is available for immediate delivery or is there still quite a waiting list. Just thought I would ask here rather than bothering them with a call....08-12-2022, 03:39 PM -
On this '29 RPU how is tail light mounted? I have light with the bracket, the arm and a block. Does the block go on outside of bed. I have two holes there just as the block. Then does the triangle end of arm mount to top of block? (no holes on top/bottom)...08-02-2017, 04:16 PM
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