Vibration Mount 91-2281 | Verified Fitment for Thermo King TS KD MD RD TD Series

Cross-reference verified — Dual-durometer mapping confirmed across Thermo King TS, KD, MD, RD, and TD series applications for Yanmar 3.95 engine builds.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Four Variants

A copied cross-reference table sends the wrong variant to the shop floor. The base identifier 91-2281 appears across multiple Thermo King transport refrigeration series, but the rubber durometer and mounting geometry differ by application. A Vibration Mount 91-2281 for Thermo King cross reference fitment check must account for series-specific torsional stress profiles.

I have seen repair centres receive a cushion damper that physically bolts on but fails within weeks because the Shore A hardness does not match the engine's vibration frequency. The KD-II series operates under different harmonic loads than the Super TD-II, and the rubber compound must absorb those specific frequencies. When a parts catalog lists one number for all series without noting the variant, the mismatch is invisible until the mount cracks or the bracket fatigues [NEED_CITE: vibration isolation durometer selection for transport refrigeration compressors].

Machine Model and Serial Range Coverage

The fitment mapping for this Vibration Mount 91-2281 for Thermo King cross reference fitment spans from the TS-200 through the Super TD-II and McTRK2 series. Each model family uses a specific bracket geometry tied to the Yanmar 3.95 or TK3.95 engine build. Confirming the correct variant requires the full unit model and, ideally, the engine serial prefix. Units produced across different years within the same model designation may carry different mount specifications due to running production changes.

Bolt Hole Alignment and Mounting Pattern Verification

The steel inserts in this cushion damper hold a ±0.1 mm tolerance on hole spacing and thread specification. The Yanmar 3.95 bracket has a fixed mounting pattern, and any deviation in the insert position forces the bolt into a bind, pre-loading the rubber before the engine even starts. Before dispatch, the bolt hole pattern, insert thread pitch, and overall mount height are checked against the application drawing. For older KD-II or RD-II units still in active fleet service, the original bracket may have been modified during a previous engine swap, making physical measurement essential [NEED_CITE: engine mount bolt pattern tolerance standards for auxiliary power units].

Reading the Specifications That Matter

The dual-durometer construction pairs a 65 Shore A outer shear layer with an 85 Shore A inner compression core. The softer outer layer handles lateral and torsional movement, while the harder inner core carries the vertical dead load of the engine assembly. This separation prevents the rubber from bottoming out under static weight while still allowing enough deflection to isolate the 15 Hz and 25 Hz vibration frequencies typical of the Yanmar 3.95 at operating speed. The bonded steel inserts distribute the load across the rubber-to-metal interface, reducing the peel stress that causes delamination in single-durometer mounts. Surface-treated carbon steel hardware meeting ASTM F1136 Grade 5 corrosion resistance is specified for units operating in marine container yards and intermodal terminals where salt exposure is constant. The –20°C to +55°C operating range covers most over-the-road and cold storage terminal environments, though units running in arctic or desert extremes should confirm suitability with the technical team.

The Hidden Cost of a Forced Fitment

A cushion damper that physically bolts on but carries the wrong durometer will transmit vibration directly into the chassis. Over time, this accelerates fatigue in the bracket welds and can crack the engine oil pan or compressor mounting flange. The repair bill for a cracked bracket far exceeds the cost of verifying the correct Vibration Mount 91-2281 for Thermo King cross reference fitment before the order ships. I have seen fleet operators replace mounts twice in one season because the first batch was sourced from a cross-reference table that did not distinguish between KD and MD series requirements [NEED_CITE: vibration-induced fatigue cracking in transport refrigeration chassis brackets].

Why Source This Part Here

Selected part lines are produced in our own facility, with the remainder sourced from qualified ISO-certified manufacturing partners — both carry the same QC and warranty terms. Eight product categories allow a complete repair list to ship as one consignment, reducing split freight. Minimum order starts from one piece, so a single emergency replacement does not require a bulk commitment. The Guangzhou warehouse stocks common items for fast dispatch, and part identification can be completed from a part number, machine model, photograph, or nameplate image. Cross-reference verification covers superseded and alternate numbers, and sample supply is available for fitment confirmation before a fleet-wide rollout.

Documentation & Verification

• Commercial invoice and packing list itemized by unit model and cross-reference number
• Part compatibility and cross-reference sheet marked reference only for 91-2281, 91-7967, and format variations
• Quality inspection record covering bolt hole pattern, insert thread, and overall height
• Warranty terms stating coverage period and manufacturing defect scope
• Packing photographs showing cushion damper condition before crate closure
• HS code and customs documentation support for international freight forwarding

Fitment Check Before Installation

• Compare bolt hole spacing on new cushion damper against Yanmar 3.95 bracket before removing old mount
• Verify insert thread pitch matches existing hardware; replace bolts if corroded beyond reuse
• Check overall mount height against specification; a compressed mount indicates pre-load or prior damage
• Confirm rubber durometer marking matches application requirement for the specific Thermo King series
• If nameplate is unreadable, submit unit photograph and engine serial prefix for identification
• Trial-fit one unit before committing the entire batch to the fleet

Submit Your Details for Fitment Confirmation

Provide the full Thermo King unit model, engine serial prefix, or a photograph of the existing cushion damper and nameplate. The technical team will verify the correct Vibration Mount 91-2281 for Thermo King cross reference fitment against the application database and return a confirmed part number with variant details. For mixed-series fleets, submit the unit list for a consolidated cross-reference check and sample arrangement.

Frequently Asked Questions

Q: How do I confirm this 91-2281 fits my specific Thermo King unit when the nameplate is unreadable? A: Submit a photograph of the existing cushion damper, the engine serial plate if visible, and any legible characters from the unit data tag. The technical team cross-references the physical dimensions and bracket geometry against the application database to identify the correct variant. This process typically returns a confirmed fitment answer within hours, not days.

Q: Are 91-2281 and 91-7967 interchangeable, or do they apply to different series? A: These numbers appear in cross-reference tables as alternates, but they may apply to different production runs or series variants within the Thermo King lineup. Interchangeability depends on the specific unit model and engine build. Submit both numbers along with your machine model for a verified cross-reference confirmation before ordering.

Q: Why does the same vibration mount number have different durometer specs across KD, MD, and TD applications? A: Each Thermo King series operates under a different torsional stress profile based on compressor size, engine output, and chassis design. The dual-durometer compound is matched to the specific harmonic frequencies of that series. Using the wrong durometer transfers vibration into the bracket, accelerating fatigue and causing premature mount failure.

Q: I only have the machine model — can you identify the correct part number without the old mount? A: Yes. Provide the Thermo King model designation (such as KD-II or MD200) and the engine serial prefix if available. The application database maps model and serial ranges to the correct cushion damper variant, including any superseded part numbers that may have been issued for that production run.

Q: Can I get a sample to verify fitment before ordering for the whole fleet? A: Sample supply is available for physical fitment testing before a bulk commitment. Submit the machine model and series details to arrange a sample unit. This allows the workshop to confirm bolt hole alignment, mount height, and rubber durometer suitability on one machine before rolling out across the fleet.