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Old 12-18-2020, 11:16 PM   #1
mill48
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Default Reconditioned Model A engine block

Hi everyone. I hope someone on here can help me with a unique need for my 1928 Model A Tudor. The water jackets on my Model A have been breached and I am in need of a replacement block in good condition at a reasonable price. Can anyone in this forum refer me to someone who can maybe help me with this?
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Old 12-19-2020, 12:48 AM   #2
J Franklin
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Default Re: Reconditioned Model A engine block

Where is the damage? Can it be repaired? A Model A club in your area may be able to steer you in the right direction.
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Old 12-19-2020, 07:31 AM   #3
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Default Re: Reconditioned Model A engine block

I doubt that it can be repaired. Some time ago a bolt broke on the intake manifold. In the process of removing the bolt, I accidentally drilled into the water jacket and was not able to stop the leak. I may be wrong, but it seems to me that the only remedy is to replace the block. I could be wrong, which is why I am appealing to this forum.
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Old 12-19-2020, 08:16 AM   #4
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Default Re: Reconditioned Model A engine block

Try your local club to find an engine block.
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Old 12-19-2020, 08:22 AM   #5
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Default Re: Reconditioned Model A engine block

Mill48, My water jacket is also breached in the same location. A previous owner drilled out the stud and went into the water jacket. I discovered it when changing manifolds. I put a gasket sealant on the stud when I re installed it and have no problems with a leak to date. I used a silicone sealant so that I could remove the stud at some time in the future if needed.
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Step on the gas, for tomorrow I die.
Forget the brakes, they really don't work.
The clutch always sticks, and starts with a jerk.
My car grows red hair, and flies through the air.
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Old 12-19-2020, 12:08 PM   #6
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Default Re: Reconditioned Model A engine block

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The manifold studs on my ’26 Buick were a “through hole” direct into the water jacket. The threads were sealed with a liberal coating of aviation Permatex.
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Old 12-19-2020, 02:08 PM   #7
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Default Re: Reconditioned Model A engine block

Even if you did not use a sealant the leak wouldn't hurt anything. Just use a bit of any type that might do the job. I would choose LockTite Blue, or old style shellac gasket sealer. Save your money for when you really bust something!
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Old 12-19-2020, 03:30 PM   #8
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Default Re: Reconditioned Model A engine block

My 1948 F2 flat head, almost all the head bolts are open to the water jacket. Just use sealer as suggested.
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Old 12-19-2020, 04:15 PM   #9
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Default Re: Reconditioned Model A engine block

If that's the only problem with the block, I wouldn't even consider replacing it. A little dab of sealant on the stud and you're back in business. I have a block that has chunks of CI broken out where someone screwed a couple of head studs too far in. Discarding the block did not even occur to me. Decent blocks are becoming harder to find. Why make things worse for no reason?
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Old 12-19-2020, 06:02 PM   #10
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Default Re: Reconditioned Model A engine block

Arnold, I have a pie of them, they may soon go to the scrap dealer if no one wants them.
Don,t worry about the studs going into the water jacket, the V8,s have all but one going into the water.

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Old 12-19-2020, 07:15 PM   #11
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Default Re: Reconditioned Model A engine block

Don't worry about this kind of water jacket leak. Put some high temperature sealant on the thread and reinsert the stud like synchro did. We had an 84 Pontiac Grand Prix and on the water pump bolts one was drilled into the water jacket by design.
This is not an issue to concern yourself with.
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Old 12-19-2020, 09:33 PM   #12
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Default Re: Reconditioned Model A engine block

How did you deal with the broken chunks of cast iron? The bolt hole is now oversized and I cannot get the proper torque on the bolt.
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Old 12-19-2020, 09:35 PM   #13
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Default Re: Reconditioned Model A engine block

Before you scrap them, can you post pictures and info on their condition?
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Old 12-19-2020, 10:19 PM   #14
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Default Re: Reconditioned Model A engine block

You had just said it was drilled too far. If there is other damage you might want to take your block to a machine shop and maybe it can have a reasonable repair.
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Old 12-19-2020, 10:37 PM   #15
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Default Re: Reconditioned Model A engine block

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Originally Posted by mill48 View Post
How did you deal with the broken chunks of cast iron? The bolt hole is now oversized and I cannot get the proper torque on the bolt.
It may be possible to install a helicoil. I have used lots of them with very good success where the head stud holes was bad.

There are other thread inserts available for a very bad hole that has been really screwed up. Your local automotive machine shop should be able to help you with this.

My opinion,

Chris W.
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Old 12-19-2020, 10:37 PM   #16
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Default Re: Reconditioned Model A engine block

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Originally Posted by mill48 View Post
How did you deal with the broken chunks of cast iron? The bolt hole is now oversized and I cannot get the proper torque on the bolt.
Have you considered installing or having a machinist install a Heli Coil?
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Old 12-19-2020, 10:54 PM   #17
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Default Re: Reconditioned Model A engine block

Timeserts are better than helicoils..a sleeve instead of a coil. But yes you can junk the block, they made millions of them. Hell I just tossed one with a water jacket crack, bored .125 over and needed main bearings.. felt a little soul twinge when it slipped off the forklift tip into the scrap bin but it passed..
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Old 12-19-2020, 11:03 PM   #18
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Default Re: Reconditioned Model A engine block

mill48... this is another option just now coming available. One of Terry Burtz' brand new engine blocks.

http://www.modelaengine.com/
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Old 12-19-2020, 11:34 PM   #19
J Franklin
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Default Re: Reconditioned Model A engine block

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Originally Posted by Jeff/Illinois View Post
mill48... this is another option just now coming available. One of Terry Burtz' brand new engine blocks.

http://www.modelaengine.com/
Yes, get one of those and give us some reports. That would work all the way around. I saw a model a engine mailbox once It was great.
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Old 12-19-2020, 11:38 PM   #20
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Default Re: Reconditioned Model A engine block

A couple thoughts. One, 348 and 409 Chevy blocks came from the factory with a couple bolts that go into a water jacket. Sealant is required, no big deal.Two, I personally wouldn't screw around with heli-coils especially when it is for a stud, not a bolt. I had a head bolt break off on my Model A engine and just drilled the hole out and tapped it to 1/2" and put a stepped stud in it. By stepped, I mean that the bottom is 1/2" then, right at the top of the threads (flush with the deck of the block) it goes to the stock 7/16". Easy, cheap and stronger than the stock stud. These studs are available from the vendors but I just made mine. If the application was for a bolt rather than a stud, I would go with the sleeves that Jack Shaft mentioned.
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