Xtracer 1152 - Torque Settings

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Issue 2.0 – 10/12/15 - 1152 Longitudinal Transaxle Sportscar Gearbox Manual

Xtrac Inc, 6183 W. 80th Street, Indianapolis, IN 46278. United States

Lint free cloths are recommended for wiping down internals. If paper tissue is used,

care must be taken to ensure fibres are not left behind which will result in a blocked

oil filter.

All joint faces are sealed with o-rings, Silicon sealant MUST NOT be used anywhere

on the gearbox, as excess sealant can enter the oil system and clog the filter or oil

sprays around the gearbox. This will lead to premature failure of the transmission.

All components are supplied from Xtrac as "ready to fit". Extra polishing and fettling

of components is not required and may, in the case of gearchange components,

cause failure to other parts, especially gear dogs and dog rings.

Since bearings have press fit tolerances, always heat the casings for the fitment or

removal of bearings to avoid damage to the bearings or casings. Do not heat the

gearbox casings above 135 °C (275 °F.) when fitting bearings as this will weaken the

casting material. Xtrac recommend the use of an oven to control the temperature

and to ensure the heat is distributed evenly. Fit bearings promptly, after removing the

casing from the oven to avoid extra heating cycles being required.

5.1.1. Torque Settings

If not stated on specific build sheets or assembly drawings, all fasteners in the

transmission should be tightened as per the Xtrac Standard XS036 given in

Appendix M – Xtrac Standards. Any non-standard tightening torques are listed in

Appendix A – Non Standard Tightening Torques.

Studs should be inserted tight into the casting using Loctite 270 thread locker. They

must then be allowed to cure for 1 hour at room temperature before further

assembly.

Bolts must either be inserted with Loctite 270/272 (when internal) or be inserted with

Loctite 241 (when external) and wire-locked, unless otherwise stated.

At each build, mark the torque tightened position of all nuts, bolts and screws, by

applying Torque Seal across the fixing and stationary part, to indicate any loss of

tightness or movement, thus avoiding unnecessary spanner checks, which can lead

to over tightened fasteners and stripped casing threads. An example of the use of

Torque Seal is shown in Figure 3 - Correct Application of Torque Seal.