Universal Valve Guide puller Remover & Installer set – mechanical type 33pc box
| Manufacturer | TOKAR |
|---|
— 33 pcs;
— Anti corrosion coating;
— Plastic box.
Kit comes:
| Mandrel: | Adapters for self centering at valve seat for arbor: |
| — arbor; — thrust nut; — thrust washer; — thrust bearing. |
— Ø 25; — Ø 33; — Ø 35; — Ø 38; — Ø 40; — Ø 43; — Ø 45. |
| assembly pilots for remove and install valve guides (ISO Strength classes 12.8): |
Spacers: |
| — Ø 5; — Ø 6; — Ø 7; — Ø 8; — Ø 9; — Ø 10. |
— L= 15; — L= 30; — L= 45; — L= 50; — L= 60. |
| Sleeve for install: | |
| — Ø 5; — Ø 6; — Ø 7; — Ø 8; — Ø 9; — Ø 10. |
Replacement of Valve Guide Bushings in the Cylinder Head (CH)
When replacing old valve guide bushings, it is important to consider that the bushing may have Seizing / welded in the cylinder head bore.
Seizing / Welded of the valve guide bushing is a process where the bushing tightly "sticks" in the bore due to:
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thermal expansion of metals,
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lack of lubrication,
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corrosion,
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incorrect installation.
Force Required to Press Out the Valve Guide Bushing
| Bushing Fit Condition | Press Force (tons) | Force, kN |
|---|---|---|
| Normal fit (no seizing) | 1–2 tons | 10–20 kN |
| Light seizing | 2–5 tons | 20–50 kN |
| Heavy seizing or scoring | 5–10 tons and above | 50–100 kN and above |
In case of heavy seizing, bushing damage is possible and mechanical processing may be required.
Maximum Breaking Loads for Puller Studs (Strength Class ISO 12.9)
| Thread Size | Force, kg | Force, kN |
|---|---|---|
| M5 | 1563 kg | 15.33 kN |
| M6 | 2213 kg | 21.69 kN |
| M7 | 3181 kg | 31.24 kN |
| M8 | 4030 kg | 39.52 kN |
| M9 | 5020 kg | 49.28 kN |
| M10 | 6388 kg | 62.65 kN |
Force Developed by the Mandrel (Strength Class ISO 6.8)
| Thread Size | Force, kg | Force, kN |
|---|---|---|
| M20 | 11990 kg | 117.68 kN |
Important Recommendations
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The mandrel develops significantly higher force than the studs.
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Improper use of studs may cause them to break, leading to damage and additional costs.
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To facilitate removal:
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Heat the cylinder head with an industrial heat gun or oven to 180–250 °C.
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Cool the bushing using an aerosol freezer, liquid nitrogen, or cold spray.
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Use pin punch tool to start valve guide moving.
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If the bushing does not come out:
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Stop applying force; do not use excessive effort.
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Reheat the cylinder head.
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Try light hammer taps on the puller body to help break the bushing loose.
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Do not increase lever arm or pressure excessively to avoid damaging the cylinder head.
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If the bushing still won’t budge, proceed to alternative methods:
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Drilling out the bushing,
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Using a hydraulic press, etc.
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