Bjay Auto Service and Maintenance

17/03/2026

⚙️Low compression is NOT always a death sentence for your engine—sometimes, the fix is as simple as a "spirited drive" to clear the lungs!
This fact is a point of major debate in the automotive industry. 🔩🚗


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Bjay Auto Service and Maintenance

17/03/2026

Piston Ring Types and Functions👇

Piston rings are important components in an internal combustion engine. They are installed in grooves around the piston and play a critical role in maintaining engine efficiency, performance, and lubrication control. Most engines use three piston rings: the compression ring, the second ring, and the oil control ring.

The compression ring, also called the top ring, is responsible for sealing the combustion chamber. It prevents high-pressure gases from escaping during the power stroke. By sealing the combustion gases, it helps maintain proper compression and ensures efficient engine performance.

The second ring, sometimes called the scraper ring, provides an additional sealing layer. Its main function is to help clean excess oil from the cylinder wall and support the compression ring by reducing gas leakage. This ring improves sealing efficiency and contributes to better engine operation.

The oil control ring regulates the amount of lubricating oil on the cylinder wall. It scrapes excess oil from the cylinder surface and returns it to the crankcase while leaving a thin oil film for lubrication. This prevents oil from entering the combustion chamber and reduces oil consumption.

Together, these piston rings maintain proper compression, control lubrication, and protect the engine from excessive wear, ensuring smooth and efficient engine performance.

Dr.mechanics



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17/03/2026

Did you know that wiring a high-draw component like a cooling fan directly to a thermal switch without using a "Relay" is a guaranteed recipe for an electrical fire? Temperature switches and interior buttons are only designed to handle low-current signals. Forcing high amperage through them will literally melt their internal contacts in seconds!
The Engineering Magic of the Relay
A relay acts as a heavy-duty electromagnetic gatekeeper. Its primary function is to use a tiny, safe amount of current (triggered by the Thermo Switch completing the circuit on pins 85 and 86) to create a magnetic field. This invisible field pulls a heavy metal contact closed, allowing massive, unrestricted power from the battery (Pin 30) to flow straight to the cooling fan (Pin 87).
The Anatomy of a Smart Cooling Circuit
When your engine coolant reaches a critical heat level, the Thermo Switch mechanically closes, completing the ground circuit. The relay emits a faint "click," and the fan roars to life. This strict separation of the low-current "control circuit" from the high-current "load circuit" is the foundation of modern automotive electrical engineering.
The Fuse: The Ultimate Sacrificial Lamb
Notice the 30A fuse situated closely inline with the battery? This component is your ultimate line of defense. If the fan motor seizes up or a bare wire touches the metal chassis, this fuse blows instantly. It sacrifices itself to cut the power, preventing your wiring harness from turning into glowing red heater elements. Tracing and repairing these complex electrical pathways with absolute precision is our standard at Auto Mechanics Center.


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17/03/2026

Trimming belt system.


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17/03/2026

➤ Torsen Differential (Torque-Sensing Differential) Explained in Depth ⚙️

A Torsen Differential is an advanced mechanical limited-slip differential designed to intelligently manage torque distribution between wheels—before wheel spin becomes a problem. Unlike conventional differentials that react after traction is lost, a Torsen works proactively, making it one of the most respected drivetrain solutions in performance and AWD vehicles.

➤ What “Torsen” Really Means

Torsen = Torque Sensing
This means the differential responds to torque imbalance, not wheel speed difference. The moment one wheel starts receiving less resistance, the Torsen instantly redirects torque to the wheel that can still use it.

➤ Internal Working Principle

A Torsen differential uses a complex arrangement of:
• Worm gears
• Worm wheels (spur gears)

⤷ Worm gears have a unique property:
They resist being driven backward.
This self-locking behavior is the heart of the Torsen’s torque-biasing ability.

⤷ When both wheels have similar traction, torque is split smoothly.
⤷ When traction differs, internal gear friction multiplies torque toward the wheel with higher grip.

➤ Torque Bias Ratio (TBR)

One of the most important characteristics of a Torsen differential.

• Defines how much more torque can be sent to the wheel with traction
• Example:
⤷ 3:1 TBR = the gripping wheel can receive 3 times more torque than the slipping wheel

This controlled biasing happens instantly and continuously.

➤ Behavior During Cornering

During turns:
• Outside wheel naturally has more grip
• Torsen senses higher resistance
• More torque is sent to the outside wheel

⤷ Result:
• Reduced understeer
• Improved corner exit speed
• Stable and predictable handling

This is why Torsen differentials are widely used in performance-oriented vehicles.

➤ Why Torsen Is Different from Clutch-Type LSDs

• No clutch packs
• No preload springs
• No wear-based friction elements

⤷ This means:
• No sudden engagement
• No maintenanc


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17/03/2026

Work must go yet 🛠️🧰💪




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17/03/2026

Big shout out to my newest top fans! John Bjay Ñűmbăț, Benjamin Meawi

23/08/2025

🚘 5-Pin Automotive Relay Explained 🔧

Relay ek electrical switch hota hai jo chhote current se bade current ko control karta hai.
Ye mostly headlights, fuel pump, AC fan, horn jaise high load circuits me use hota hai.

👉 Ye diagram ek 5-Pin Relay ka hai jisme 5 terminals hote hain:

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🔹 Pin Details:

1. 85 (Coil Terminal)
– Coil ka ek end hota hai.
– Isse ground ya negative se connect karte hain.

2. 86 (Coil Terminal)
– Coil ka dusra end hota hai.
– Isse switch ke through positive supply dete hain.

3. 87 (Normally Open - NO)
– Ye contact normally open rehta hai.
– Current tab flow karega jab relay ON hoga.
– Example: Headlight ON hone par current milega.

4. 87a (Normally Closed - NC)
– Ye contact normally closed rehta hai.
– Matlab relay OFF hone par yaha current flow karta hai.
– Jaise ignition band ho to kuch circuit ko supply dena.

5. 30 (Common Terminal)
– Ye main input hota hai jaha se power aati hai.
– Ye supply either 87 ya 87a me jaati hai (relay ki condition ke hisaab se).

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🔧 Relay Working:

Jab coil (85 & 86) me current pass hota hai → ek magnetic field banti hai.

Ye magnetic field switch ko move karti hai.

Result: Common terminal (30) connect hota hai ya to 87 se (ON) ya 87a se (OFF).

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🌟 Simple Example:

🚗 Headlight Circuit

Switch ON → 85 & 86 pe current → Relay activate → 30 se 87 connect → Headlight jal jaata hai.

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✅ Is tarah relay gadi ke electrical load ko protect karta hai aur circuits ko safe & reliable banata hai.

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23/08/2025

23/08/2025

The Following are the Main Parts of Rear Axle Assembly:

The rear axle in a car is a key component of the drivetrain, responsible for transmitting power from the engine and transmission to the rear wheels. It typically consists of an axle housing, differential, and axle shafts. The rear axle can be live (powered) or dead (unpowered), depending on the vehicle's drivetrain configuration.

Working:

In rear-wheel-drive cars, the rear axle serves as the main driving axle, providing torque to the wheels and enabling motion. It also plays a critical role in supporting the vehicle's weight and maintaining stability while driving. Rear axles are often designed with varying mechanisms, such as independent or solid axle setups, depending on the vehicle's purpose and design.

Parts of Rear Axle:

1. Filler Plug:

The filler plug in a rear axle is a removable cap or bolt that allows access to fill or check the level of the differential oil inside the axle housing.

2. Drain Plug:

A drain plug in a differential is a plug that allows the fluid in the differential to be drained out.

3. Differential:

A differential system is a mechanical device that allows the wheels of a vehicle to rotate at different speeds while the vehicle is turning.

4. Leaf Spring:

A leaf spring suspension system is a type of vehicle suspension that uses steel layers of varying thicknesses to compensate for uneven road surfaces and ensure the wheels stay in contact with the road.

5. Wheel:

A car wheel is a circular metal or alloy component that connects to the hub of a car through an axle.

6. Differential Casing:

A differential casing, also known as a diff case, is a housing that contains the gears that allow a vehicle's wheels to rotate at different speeds.

7. Axle Shaft:

An axle shaft is a solid rod that connects a pair of wheels and allows the transmission to transfer motion to the wheels.

8. Propeller Shaft:

A propeller shaft, also known as a drive shaft or prop shaft, is a component that t