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Discover the essential role of the BY90003069303 Shim, a precision-engineered thickness adjustment component vital for SHACMAN heavy-duty diesel engines. This genuine OEM part is designed to establish and maintain exact mechanical clearances within critical assemblies, such as between bearing caps, gear trains, or linkage components. As a trusted source for high-quality Shacman truck parts, we understand that these seemingly simple components are fundamental to engine longevity and performance. The BY90003069303 is manufactured to SHACMAN’s exacting thickness and material specifications, ensuring perfect fit and dimensional stability.
Its primary function is to eliminate unwanted play or preload, allowing technicians to achieve factory-recommended tolerances during assembly and maintenance. Understanding the importance of this specific shim is crucial for accurate engine rebuilds, gear mesh adjustment, and preventing premature wear caused by improper clearances.
Shim
Precision-Grade Steel or Brass Construction: The BY90003069303 shim is crafted from high-quality, cold-rolled steel or brass, providing consistent thickness, excellent compressive strength, and resistance to deformation under high clamp loads.
Laser-Cut or Precision-Blanked Edges: Features clean, burr-free edges from advanced manufacturing processes, ensuring it fits perfectly into tight spaces without interfering with adjacent components or causing damage during installation.
Consistent Thickness Tolerance: Manufactured to extremely tight thickness tolerances (often within +/- 0.005mm), guaranteeing predictable and repeatable adjustments for achieving precise component clearances.
Anti-Corrosion Surface Treatment: Often coated or plated to prevent rust and oxidation, which could alter its effective thickness or cause it to seize in place, making future adjustments or disassembly difficult.
The table below details the technical specifications for the BY90003069303 Shim. This data is crucial for selecting the correct adjustment component for your SHACMAN engine or assembly.
| Parameter | Value / Description |
|---|---|
| OEM Part Number | BY90003069303 |
| Product Name | Shim |
| Brand | SHACMAN |
| Primary Material | High-Carbon Steel or Brass (Application Specific) |
| Standard Thickness | 0.10 mm, 0.15 mm, 0.25 mm, 0.50 mm (Example Range) |
| Thickness Tolerance | ± 0.005 mm (Precision Grade) |
| Hardness | HRB 70-85 (for steel) – Resistant to Crushing |
| Surface Finish | Smooth, often Zinc or Tin Plated |
| Shape | Round, Square, or Rectangular (Model Specific) |
| Inner/Outer Diameter or Dimensions | Specific to bearing caps, gear shafts, or linkage points |
| Primary Application | Bearing Endplay Adjustment, Gear Backlash Setting, Linkage Preload |
Always verify BY90003069303 compatibility, including exact thickness and dimensions, using your specific engine model’s SHACMAN service manual or parts catalog.
The BY90003069303 Shim is a critical adjustment component used in various locations within SHACMAN engines and drivetrains. A common application is behind timing gear bearings.
Here, it sets the correct axial endplay for the gear, preventing excessive movement that causes noise and wear while allowing necessary thermal expansion. It is also used under bearing caps.
In this role, the BY90003069303 adjusts the preload or clearance of tapered roller or ball bearings, which is vital for their longevity and proper load distribution. Some linkage assemblies use shims.
They take up slack between pivot points to eliminate unwanted play without creating binding. The primary function is to act as a precise spacer. It fills a dimensional gap to achieve an engineered clearance.
This is not a part that wears out in service but is a calibration component installed during assembly or rebuild. Using the correct thickness of the BY90003069303 is essential.
An incorrect shim can lead to bearing failure, noisy gears, or reduced component life. This part exemplifies the precision required in heavy-duty engine manufacturing and repair.
1. During assembly, measure the existing clearance or endplay using a dial indicator or feeler gauges as specified in the SHACMAN service manual.
2. Calculate the required adjustment based on the measurement and the target clearance. The formula is usually provided in the manual.
3. Select a BY90003069303 shim of the appropriate thickness from the available service kit. Shims can often be stacked to achieve the exact total thickness needed.
4. Ensure the mounting surface and the back of the shim are perfectly clean and free of debris, nicks, or old sealant.
5. Place the shim in its correct location (e.g., in a bearing cap recess or against a shoulder). Ensure it sits flat and is not cocked.
6. Reassemble the components and torque fasteners to specification. Re-measure the clearance to confirm it is now within the acceptable range.
7. If the clearance is incorrect, disassemble and repeat the process with a different thickness of the BY90003069303 shim.
• Shims like the BY90003069303 are typically only inspected or replaced during component overhaul, not routine maintenance.
• When disassembling an adjusted assembly, note the number and thickness of shims installed for reference during reassembly.
• Inspect used shims for signs of crushing, galling, or corrosion. Always replace them with new ones if any defect is found.
• Never reuse a shim that has been crushed or deformed, as its effective thickness is no longer accurate.
• Keep a selection of genuine BY90003069303 shims of various thicknesses in your workshop kit for common engine models.
• Record final shim selections in the engine’s build sheet for future reference, as tolerances can change with wear.
Patience and accurate measurement are key. Rushing the shim selection process for the BY90003069303 can result in an incorrect clearance, leading to rapid component failure soon after reassembly.
Choosing the genuine BY90003069303 shim guarantees the exact material properties and dimensional accuracy required for precision adjustments. SHACMAN specifies the hardness and finish.
Aftermarket shims may be made from softer material that compresses over time, altering the clearance. Their thickness tolerances may be looser, leading to inaccurate adjustments.
The genuine BY90003069303 is produced with consistent quality, ensuring that a 0.25mm shim is exactly that, with no variation that could affect critical bearing preload or gear mesh.
Using authentic shims ensures the engine is assembled to factory specifications, protecting your investment and maintaining the designed performance and reliability of the assembly.
Master rebuilders emphasize that using genuine shim kits, including the BY90003069303, leads to more predictable and successful first-time engine assemblies. Clearances are achieved correctly from the start.
Technicians appreciate the consistent thickness of OEM shims. They report that aftermarket shims sometimes vary slightly within the same pack, causing frustration during precise adjustment procedures.
Fleet maintenance records for engines built with genuine components like the BY90003069303 show fewer comebacks for bearing-related noises or failures, directly attributable to correct initial setup.
The durability and non-corrosive properties of the genuine SHACMAN shim are noted, especially in applications exposed to engine oil, ensuring they remain serviceable if disassembly is required years later.
Properly adjusted clearances using the BY90003069303 contribute to mechanical efficiency. Correct bearing preload reduces parasitic drag, which can have a minor positive effect on fuel economy.
More importantly, precise adjustments prevent premature component failure. This extends service intervals and reduces the frequency of overhauls, conserving resources and reducing waste.
SHACMAN’s commitment to precision in parts like the BY90003069303 minimizes the risk of assembly errors that could lead to catastrophic failures and the associated environmental impact of major repairs.
From a safety standpoint, a correctly shimmed assembly, such as a steering gearbox or critical engine component, functions reliably, contributing to overall vehicle safety and operator confidence.
Each production batch of BY90003069303 shims is subject to quality checks for material certification, hardness, and critical dimension verification using precision measurement tools.
As an authentic SHACMAN component, the BY90003069303 is covered by the manufacturer’s standard warranty against defects, providing assurance of its quality and conformance to specifications.
Purchasing from authorized channels guarantees you receive genuine, traceable parts. This is especially important for calibration components where absolute accuracy is non-negotiable.
Using certified genuine shims is often a requirement to maintain warranty coverage on related major assemblies, such as a rebuilt engine or transmission.
The genuine BY90003069303 shim is a low-cost component that protects high-value assets. An incorrect adjustment due to a poor-quality shim can destroy bearings, gears, or shafts.
Its precision saves valuable workshop time by eliminating guesswork and rework. Technicians can trust the labeled thickness and achieve the correct clearance on the first attempt.
Standardizing on OEM shims across a fleet maintenance program ensures every repair meets the same high standard, leading to consistent engine performance and longevity across all vehicles.
Investing in the genuine BY90003069303 is a classic example of preventive spending that avoids exponentially higher costs associated with premature mechanical failures.
The BY90003069303 shim is designed for a specific adjustment point within specific SHACMAN engine or chassis models. Fitment is determined by application, location, and required thickness.
Shims are not universal. The diameter, inner hole size, and shape are critical. A shim for a camshaft bearing cap will not fit a pinion gear adjustment, even if the thickness is the same.
Always identify the exact location and purpose of the shim using the official SHACMAN parts explosion diagram for your engine model. Use the specified BY90003069303 part number for that location.
Correct fitment ensures the shim covers the necessary area, provides even support, and does not interfere with oil passages or other components. Never substitute a shim based on thickness alone.
The BY90003069303 Shim is a fundamental tool for precision, allowing you to dial in the exact clearances that SHACMAN engineers designed for optimal performance and durability.
Choosing the genuine BY90003069303 is an investment in accuracy, ensuring every adjustment contributes to the long-term health and reliability of your engine or drivetrain.
For your next rebuild or critical adjustment, insist on the authentic SHACMAN BY90003069303 Shim. Achieve perfect tolerances, protect your components from premature wear, and build with the confidence of OEM specifications.
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