This is a purely craftsmanship job; there can't be any burrs on the edges, otherwise the high-pressure gas can easily break through the seal.
The scissors moved swiftly, and scraps of paper fell everywhere.
Soon, a homemade gasket with almost no flaws was finished.
He applied a thin layer of sealant and gently placed it on the cylinder.
When it comes to final assembly, this is the most crucial step.
The cylinder head bolts must be tightened in a crisscross pattern and in three stages to prevent the cylinder head from warping.
Su Wei picked up the torque wrench.
Set to 40 Nm.
First time.
Click. Click.
The crisp click of the limiter tripping mechanism echoed in the quiet garage.
The sound was very rhythmic.
The second time, 60 Nm.
Su Wei's hand was very steady.
With each turn, he could clearly feel the threads stretching, the cylinder head pressing down, and the metal fitting together tightly under high pressure.
The third time, 80 Nm.
The last screw.
The muscles in my arms bulged slightly from the continuous exertion, and sweat trickled down my forehead and into my eyes, stinging painfully.
He didn't blink.
Until €€€€
Click.
It's done.
Su Wei threw down the wrench and slumped onto the greasy stool.
The soreness suddenly surged up into my arms.
The wall clock pointed to four o'clock in the afternoon.
I missed lunch.
His stomach rumbled.
The noise woke Cotton Candy up. She poked her head out of the cardboard box, tilting it and looking at it with a puzzled expression, as if asking, "Where's the food?"
"Don't rush, this is the last step."
Su Wei propped himself up on his knees and dragged a fully charged old battery out of the corner.
The red wire is connected to the positive terminal, and the black wire is grounded.
The high-voltage coil is properly inserted.
Lacking a fuel tank, Su Wei grabbed an empty Coke bottle, filled it halfway with gasoline, hung it upside down on the shelf, and connected it directly to the carburetor with a transparent flexible tube.
A very rudimentary test bench.
But it's enough.
Su Wei wiped the machine oil off his palms onto his trouser leg.
Whether it works or not depends on this one attempt.
He picked up the two bare wires of the starter.
This old machine doesn't need a key; it can be started simply by touching two wires together.
The two copper wires touched.
Sizzle!
A blue spark flashed.
The starter gear slammed into the flywheel, emitting a piercing screech.
Squeak squeak €€€€ squeak €€€€
The engine shuddered violently, and the crankshaft was forced to turn.
No luck.
Su Wei loosened the thread, not in a hurry.
The carburetor float chamber is not yet full of fuel.
He pressed the enrichment pump on the carburetor and sprayed a mouthful of starting fluid directly into the hose.
Let's try again.
Sizzle!
Squeak squeak €€€€
boom!
A deafening explosion.
A thick plume of black smoke suddenly shot out of the exhaust pipe, and the pungent smell of exhaust fumes immediately dissipated.
The moment the plume of black smoke dissipated.
Thump thump thump thump...
A rhythmic, deep sound rang out.
With four pistons reciprocating at high speed inside the cylinder, the engine, which had been idle for three years, started running again on this cold afternoon.
It even runs more smoothly than it did before it was scrapped.
Su Wei reached out and fine-tuned the carburetor idle screw.
The thumping sound became denser and deeper.
There was no valve knocking sound.
There was no abnormal crankshaft noise.
There was only the pure, deep sound of mechanical operation.
Even the noise-averse Cotton Candy came over, curiously staring at the wildly spinning pulley, its big tail sweeping back and forth on the ground.
Su Wei placed his palm on the vibrating valve cover.
Warm.
The regular, high-frequency vibrations traveled throughout my body along the lines of my palm.
Once this engine is fixed, we can drive that snowmobile to the U-shaped valley and settle that debt of over ten thousand US dollars.
Su Wei cut off the oil supply.
The engine noise weakened twice, then stopped.
Only a trace of warmth remained.
A flood of information was rushing through his screen.
[You have completed a highly complex and precise mechanical overhaul.]
[Turning decay into magic, a work of art was completed.]
[Repair Completion: Perfect.]
[ Life Module Experience +100!]
[ Mechanical Repair Experience +100!]
[Congratulations!]
[ Life Module LV3 (126/500)]
[ Mechanical Repair level upgraded to LV2 (31/300)!]
Su Wei looked at the characters, and the corners of his mouth couldn't help but turn up in a smile.
At that moment, he felt all his fatigue disappear.
Mechanical Repair LV2.
This means that his understanding of mechanical structures has reached a new level.
Restoring this old naturally aspirated engine is just the beginning.
Next up is the more complex snowmobile in the corner of the garage.
He is now confident that he can fix it too.
Chapter 58 Steel Anatomy: The Fatal Internal Wound of the Snowmobile