Tech Resources Transmission Article Valve Body Reaming
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November 19, 2008
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Reaming Instructions: If VB-FIX Required

These instructions are for Sonnax tool kits whose part numbers begin with "F-" to indicate they require use with the Sonnax valve body reaming fixture VB-FIX .


General "F-Tool" Reaming Instructions


1. Bore Preparation

a. Clean the bore thoroughly in a solvent tank.

b. Generously lubricate the bore and reamer with cutting fluid (i.e. Mobilmet S-122, Lubegard® Bio-Tap, Tap Magic™, etc.). For best results, provide a continuous flow of water-soluble cutting fluid (i.e. Mobilmet S-122) during the reaming process.

c. The reamers should be turned using a low RPM, high-torque drill regulated to a maximum of 200 RPM.

d. Examine the bore after cleaning for surface finish, debris and burrs. Flashing and burrs on the exit side of land and in bores must be carefully removed. A small piece of Scotch-Brite™ material attached to a wire and powered with a drill motor is ideal for the task. However, Scotch-Brite™ is a very abrasive material and all residual Scotch-Brite™ debris must be removed afterward to ensure particles do not migrate or remain embedded in the surface. Cleaning this material out should involve several progressive steps using solvent on a lint-free rag.

Cautions & Suggestions
  • Turning the reamer backward will dull it prematurely.
  • Pushing on the reamer will result in poor surface finish and inadequate and sporadic material removal.
  • Never use a crescent wrench, ratchet or pliers to turn the reamer.
  • A dull reamer will cut a smaller hole. Reamers can be sharpened, but should only be done by a professional tool sharpener. Actual life of a Sonnax reamer before resharpening or replacing averages 50–70 bores.

2. Bore Reaming

Use the associated “F-Tool” kit and VB-FIX reaming fixture as illustrated below to ream the bore.
1.

Insert the reamer jig
2.

Align the guide pin and valve body.
3.

Tighten the clamp.
Guide pin must move freely.
4.

Do not clamp over bore. Leave gap.
5.

Tighten wing nuts.
Guide pin must move freely.
6.

Remove guide pin. Do not loosen clamp or wing nuts.
7.

Insert the reamer.
8.

Use a loose fitting reamer socket, a wobble adapter and a regulated air drill.
9.

Use a continuous supply of cutting fluid and little or no inward force.
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Related Parts

Required

Recommended

Valve Body Reaming Fixture VB-FIX

Valve Body Reaming Fixture VB-FIX

    Helps cure:
  • Some worn valve & pump bodies cannot be salvaged

While Sonnax makes every effort to ensure the accuracy of technical articles at time of publication, we assume no liability for inaccuracies or for information which may become outdated or obsolete over time.

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