Читать книгу Muncie 4-Speed Transmissions - Paul Cangialosi - Страница 3

CarTech®, Inc.

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© 2014 by Paul Cangialosi

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Edit by Paul Johnson

Layout by Chris Fayers

ISBN 978-1-61325-211-6

Item No. SA338

Front Cover:

State-of-the-art replacement Muncie case components and gears set a new standard for rebuilding an old, worn-out Muncie 4-speed.

Title Page:

This is a completed SPEC-25. The special Teflon coating reduces internal friction and heat: The exterior becomes a non-stick surface and gasket surfaces clean up very quickly. Plans are in the works for new-style NASCAR synchro assemblies and more ratios, so a SPEC-35 will most definitely be in the future!

Back Cover Photos:

Top

Usually the gear and 3-4 synchro hub dislodge if you hold third gear and gently tap on the front of the mainshaft. Later units have hardened hubs with extremely tight press fits, and you must use a press to remove them. If the gear and hub do not come off, do not use a hammer to try to remove them. The tip of the mainshaft is easily damaged. Use a press and bearing clamp on third gear for removal.

Middle:

Lift the countergear out of the case. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. If that has happened, stand the case on its front face, so that the loose gear doesn’t cock or move off center, and rotate it as you remove it.

Bottom Left:

The bronze synchro ring has a 6-degree internal taper that matches the taper on the gear’s synchro cone. As it is forced up against the cone, it eventually causes the output shaft to run at the same speed as the gear. It’s essentially a cone clutch.

Bottom Right:

I never press directly on gear surfaces. The lower gear has an old bearing race against it. This grabs closer to the inside diameter of the gear to prevent press-surface contact with the gear teeth.