Classic Austin Mini Cooper-1275 Crankshaft Center Main Strap With Bolts

Classic Austin Mini Cooper-1275 Crankshaft Center Main Strap With Bolts

Classic Austin Mini Cooper-1275 Crankshaft Center Main Strap With Bolts
Qty:
$21.95
Part No: CMS13
Internet Price $21.95
Steel center main strap for large bore engines, comes with longer high tensile bolts. Main top cap needs machining flat, no other modifications required. On all performance A series engines it is essential to ensure accurate and as near permanent location of the center main bearing of the crankshaft as possible. Flexure allowed here, especially at sustained high RPM levels, can cause spun bearings, crank or main cap breakage with severe or mortal damage to the engine.

This strap is used to give support and strengthen the centre main bearing cap on large-bore engines (1275cc-plus). It helps counter the problems caused at higher rpm where crankshaft flex (‘whip’) causes the standard cap to move (‘shuffle’) leading to bearing failure and possible breakage of the main bearing caps. In particular, where higher rpm than standard will be the norm – i.e. in excess of 6,000rpm. Especially where this is for extended periods.

The standard centre main cap needs to be machined by a competent engineer or engineering shop, as the finished surface needs to be absolutely flat. The final finish being ground where practical.

The cap should be milled/machined down to the original bolt head surface. If the finish is not smooth and flat, this MUST be finish-ground.

When finally assembling the engine, ensure strap is fitted with adjusted chamfer edges to cap, fit new bolts supplied and torque down to standard setting (threads clean and dry, 65lb ft.). Higher torque settings are not necessary.

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