By the end of the second day, the damaged area had been mechanically repaired using equipment and materials appropriate to the casting. Jonah's hands ached, but he felt none of the excitement that had followed his first neat practice piece. The repair looked clean, yet he knew that appearances had already fooled him once. He stepped back and asked his father to check the record before they prepared the block for testing.
Dale read the notes slowly. He found Jonah's description of the original fracture, the places where uncertainty had forced them to inspect further, and the limits they had placed on the repair. For years, Dale had treated the black notebook as a child's fascination with machinery, but the pages now resembled the kind of record he wished every contractor would leave after working on their farm. He handed it back without comment, then asked Silas when they could begin testing.
The first test started the following morning in a controlled fixture with suitable safety precautions and everyone standing where Silas instructed. Jonah watched the pressure stabilize and fought the urge to check the same spot continuously. Dale stood beside him, holding the folded supplier estimate in one hand as though he hadn't realized he'd brought it into the shop. Silas rested both hands on the bench and studied the block without moving his chair.
For several minutes the repair held. No moisture appeared where the fracture had been, and the instrument readings remained within the range they expected. Dale released a breath so slowly that Jonah almost smiled. Then a faint wet bead appeared at the edge of a sealing surface several inches away.
Dale saw it first. "There," he said, and his tone carried the fatigue of a man who had hoped not to hear that word. Jonah shut down the test according to their plan and waited until the fixture was safe to inspect. The leak was small, but its timing made the silence in the workshop heavy.
Roy's photographs lay on a shelf nearby. Jonah knew what his father was thinking, because he was thinking it himself: a replacement tractor could be delivered and put to work while they were still studying the first unsuccessful test. He crouched beside the block and examined the wet area without touching the repaired fracture. The moisture seemed to originate along an old sealing surface rather than from the reinforced crack.
He brought Silas over to look. The older man studied it, then asked Jonah to describe exactly what the evidence showed rather than what he hoped it meant. Jonah explained that the repaired section remained dry, while the leak appeared at a surface whose condition had not been fully apparent before disassembly. He added that they would need to check whether the sealing area could be restored properly before drawing any conclusion about the entire block.
Dale listened, his irritation slowly giving way to attention. He asked whether the new leak might have been caused by the repair, and Jonah said he could not rule that out without further inspection. They examined the surface with appropriate measuring equipment and compared it with the service information Silas kept on the shelf. The findings pointed to an older irregularity that had been concealed beneath a worn gasket, a separate defect the pressure test had brought into view.
"So it wasn't the crack?" Dale asked. Jonah shook his head. "Not this leak," he said. "But until we've corrected the sealing problem and tested it again, it doesn't make the block good." Silas nodded, appreciating that his grandson refused to turn one reassuring detail into a final answer.
Correcting the sealing surface required patience and a second opinion from a machinist Silas trusted. They transported the block for a proper assessment, explained the history of the repair, and asked that the relevant surfaces be checked rather than simply cleaned for appearance. The machinist found the irregularity manageable, but he refused to promise the entire repair would hold until testing was repeated. Jonah liked him immediately because the answer sounded like Silas.
The second controlled test was quieter than the first. Nobody wanted to tempt disappointment with hopeful predictions, and even Emma stayed out of the shop until the instruments had settled. Jonah recorded the readings, watched the repaired region and the corrected sealing surface, and let the prescribed test run its full course. When they finally completed the inspection, there was no new leak to explain.
Dale sat down heavily on a wooden crate. He looked at the casting, then at the notebook, and finally at his son. "Is that it?" he asked. Jonah answered that it was evidence the block had passed this stage, not proof that the assembled engine could never fail. Silas smiled because the distinction was exactly the one he had spent the winter teaching.
A qualified outside mechanic reviewed the work and testing before Dale agreed to reassemble the engine. That additional check cost money they could barely spare, but June entered it in the ledger without complaint. She said spending a little more to know what they had done was safer than pretending an unverified repair was free. Jonah helped return the components to their places, marking each completed check in his notes.
They worked through another long day. The shop filled with the ordinary clink of tools and the smell of cleaning solvent, and the tractor slowly resumed its familiar shape. When the engine was finally ready, Dale stood beside the controls and asked whether everyone had finished inspecting their work. Jonah looked once more at the notebook, checked the relevant items, and said he was ready for a controlled start.
The first attempt produced only the heavy effort of a cold engine reluctant to return to work. Dale stopped, checked the appropriate starting conditions, and tried again after they had confirmed there was no obvious problem. The engine caught with a rough burst of sound, shuddered, and settled into the familiar rhythm Jonah had heard since childhood. For a moment none of them spoke.
Silas closed his eyes. The diesel's rough idle was a voice he knew well enough to recognize when something was wrong, and he listened as carefully as if the entire repair lay inside the sound. Dale watched the instruments, June stood by the doorway, and Emma covered her ears while laughing. Jonah listened for the noise he had feared most, the sudden alteration that would mean the work had not been enough.
Nothing unusual came. The engine warmed under observation, and the first checks revealed no fresh moisture or other sign of immediate failure. Dale kept the machine under controlled conditions until everyone agreed it was reasonable to proceed to a limited field test. Jonah wrote down the readings and stood back, his hands trembling slightly now that the hardest part of the work was no longer directly in front of him.