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06-27-2022, 07:55 PM | #1 |
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Join Date: Dec 2021
Location: Axtell Texas
Posts: 73
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Cracked Model A Block
Has anyone repaired one this bad? It’s cracked down 2 cylinders & all the way down the center head stud boss. I’m in Axtell Texas if anyone close has one to sell.
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06-27-2022, 08:59 PM | #2 |
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Re: Cracked Model A Block
With that crack extending down the cylinders, I don't think stitching is an option. I'm afraid you should be looking for a new block to rebuild.
I don't know how high your pennies are stacked but I think a very viable option would be one of the new Burtz blocks. They cost about the same as reboring an old one and doing the Babbit bearings and you will have an all new and far superior engine. You can use all of the attachments from your current engine like head, cam shaft, distributor, water pump etc - The lot.
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06-27-2022, 09:11 PM | #3 |
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Re: Cracked Model A Block
my opinion. try to find another block rather than attempt to repair.
you would probably have to stich it then sleeve it, you may as well start with a better block that is within rebuild specs. or a new block. the problem with a "good runner". the seller says its a "good runner" or "all gone through" or "ran good when parked" and you end up doing a complete rebuild anyway. buyer beware.
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06-27-2022, 11:23 PM | #4 |
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Re: Cracked Model A Block
I agree, time for a "new" block.
Chris W. |
06-28-2022, 06:04 AM | #5 |
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Re: Cracked Model A Block
go to local CL
many good complete motors for around 250. |
06-28-2022, 10:27 AM | #6 |
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Re: Cracked Model A Block
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06-28-2022, 05:02 PM | #7 |
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Re: Cracked Model A Block
I believe that is the problem Terry Burtz has mentioned which is caused by torquing the #1 head nut at too high a starting torque when torquing the head. Terry suggests using a starting around 10 or 15 lbs and not torquing the head in a circular pattern but start torquing at the rear of the head and work your way forward, increasing torque by 10 or 15 lbs each pass.
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06-28-2022, 06:22 PM | #8 | |
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Re: Cracked Model A Block
Quote:
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06-28-2022, 06:54 PM | #9 |
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Re: Cracked Model A Block
Pete Aardema and Kevin Braun who built the world's fastest Model A engine put a clamp around the top of the engine to keep it together and prevent this kind of crack. They say the Model A engine is weak in this respect. See https://www.youtube.com/watch?v=T29HFhrbT_s
Where he talks about the block clamp is at 7:50 in the video.
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06-29-2022, 12:30 AM | #10 | |
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Re: Cracked Model A Block
Quote:
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06-29-2022, 06:27 PM | #11 | |
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Re: Cracked Model A Block
Quote:
The principle is not new.
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06-30-2022, 10:59 AM | #12 | |
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Re: Cracked Model A Block
Quote:
Tnx, Ken
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06-30-2022, 11:13 AM | #13 |
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Re: Cracked Model A Block
Guy’s, these engines have lasted almost 100 years. They deserve a rest.
Try comparing the Model A and it’s engine to any low cost mass produced car today. What will people be saying about them in 100 years? Model A’s and Model T’s, great cars. Enjoy. |
06-30-2022, 11:23 AM | #14 |
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Re: Cracked Model A Block
Use a timesert in the center head stud bore, don’t worry about the rest, cracks connecting the water jacket are harmless.
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06-30-2022, 03:47 PM | #15 | |
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Re: Cracked Model A Block
Quote:
The scooter was a "PUCH" brand. I doubt you guys had them. They had a 2 stroke engine of 150 cc with oil mixed in the fuel as you filled. I could get a reliable 100 miles per imperial gallon. Top speed was about 60 mph and it took me everywhere. Those were the days!
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06-30-2022, 04:18 PM | #16 |
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Re: Cracked Model A Block
Those were the days. Had a 125cc BSA bantam. Tank cap measured oil to mix.
John
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06-30-2022, 04:24 PM | #17 |
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Re: Cracked Model A Block
My wife had one of those though her sister rode it more. They were a more conventional motor cycle but they were not for me.
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07-01-2022, 07:05 PM | #18 |
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Re: Cracked Model A Block
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07-01-2022, 07:15 PM | #19 |
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Re: Cracked Model A Block
Are the sleeves cracked too? If not,you could verify oil water contamination with a block pressurizing test.
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07-02-2022, 10:16 PM | #20 |
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Join Date: Dec 2021
Location: Axtell Texas
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Re: Cracked Model A Block
I'm going to fix it. Just wanted to see if anyone on here has repaired one like this. Also was hoping someone in my area might have a engine for sale. These blocks are made out of some good stuff not like all this new Chinese metal with all the impurities. Only the good welders on here will know what I'm talking about. I'll post pics when I do it. Right now I'm working on my chassis to get the body on it.
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