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| | | | Joined: Jul 2024 Posts: 20 'Bolter | | 'Bolter Joined: Jul 2024 Posts: 20 | Hello I have a question I have a 235 engine and I noticed on lower left side beneath the freeze plug I noticed some coolant on the lower part of the block . It looks like there a scratch in the paint is it common for the block to be cracked. Is there a fix for it
Last edited by Sal3167; 07/08/2025 5:58 AM.
| | | | | Joined: Oct 2021 Posts: 6,691 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,691 | Yes. Virtually every 216 and 235 has a horizontal crack in the water jacket in that location. It can be fixed with epoxy like JB Weld or Marine Tex.
The engines are zero or low pressure so there;'s really no force being exerted internally to push coolant through the repair.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Jul 2024 Posts: 20 'Bolter | | 'Bolter Joined: Jul 2024 Posts: 20 | | | | | | Joined: Sep 2009 Posts: 5,777 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,777 | Sal - There is a "Legacy Tech Tip" Repair a cracked engine block that offers one possible fix for your problem. There are also a number of threads like this one started by T-Doug that offer info on Otto's suggested method of crack repair. If you want to read more in earlier posts, use the Stovebolt Search and look for "cracked block repair". There's a bunch to see and read to offer some tips and help. 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Jul 2024 Posts: 20 'Bolter | | 'Bolter Joined: Jul 2024 Posts: 20 | | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | For a permanent repair, look into the "Lock-N-Stitch" system. It involves stop-drilling both ends of a crack, and installing a series of overlapping threaded plugs with thread sealant on them to eliminate the crack and replace it with solid metal. It's labor-intensive, and somewhat expensive, but it's very effective.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Apr 2024 Posts: 228 'Bolter | | 'Bolter Joined: Apr 2024 Posts: 228 | I did that on a classic chevy 235 many years ago. We called it "lacing" . I was taught a sealant wasn't necessary on the plug threads as rust would form very quickly and seal the joints. My crack was a long one, about 9" long. I drove the truck about 9 months after that and then used it to tow my wife's car from Texas to Connecticut and sold the chevy there. It never had another leak. The only difficult part is drilling the overlapping holes.
1956 3100 three speed 6 cyl. Stock with a few upgrades.
| | | | | Joined: Oct 2021 Posts: 6,691 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,691 | For a minor crack in the water jacket, epoxy is the best method. No need to remove the engine to do it either.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
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