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BMW Mini Cooper
Classic Austin Mini camshaft timing belt drive kit

Classic Austin Mini camshaft timing belt drive kit

Classic Austin Mini camshaft timing belt drive kit
Alternate Products
Mini Vernier adjustbale duplex timing gear set
$234.95 Mini Vernier adjustbale duplex timing gear set
Replacing the original camshaft timing chain with a high tech Gilmer belt was a giant step forward. Now with improved metallurgy for the gears and use of a plastic housing we have probably reached the ultimate - highest quality with the lowest weight. The adjustable sprocket uses dowel pins to insure no-slip precision control of the cam timing.

The ubiquitous toothed belt cam drive system, originally developed for use on high performance race engines, is now generally accepted as the norm on all state of the art, modern engines. The application of this drive system gives very accurate ignition tming and quiet running, advantages that do not diminsh with time. The fibre glass reinforcing in the belt all but eliminates the stretch suffered - usually excessively - by chain driven systems. The retention of accurate ignition timing keeps performance at a peak, rather than deterioration suffered with the scatter induced by chain drives. The MINI SPARES KIT enables the 'A' Series owner to benefit from such technology.

The adjustable cam gear allows up to 9° of adjustment, facilitating accurate cam timing, particularly when installing a performance camshaft.

FITMENT: After removing the old cover and gears, remove keys and clean cam and crank surfaces, ensuring new gears are a light slide fit. Remove cam plate retaining bolts and fit without shake proof washers, using thread-loc instead. This is to eliminate binding between the cam centre boss and nut heads when non original bolts and washers are used. Refit keys, once again checking that the gears are a light slide fit. If this is not done, the alloy seal-cover will be damaged when gears are removed using the cover as a lever point. Also if the crank key is too proud, it will form a ridge in the bottom pulley when forced on. Consequently this will cause an oil leak.

After checking that the gears are a lgiht slide fit, press the seals squarely into the seal-cover. With the gasket supplied in place, offer the cover up to the engine. Before screwing in retaining bolts tightly, fit the two gears through the seals and onto their relevant shafts - this will centralise the cover, helping to avoid oil leaks. Tighten the bolts down evenly to ensure the cover is pulled down square. DO NOT OVER TIGHTEN.

The cam gear can be set in the standard position by aligning the two dots adjacent to each other on the cam gear centre piece and outer section, then inserting the peg through the holes next to the dots.

Adjustment is achieved by removing the peg with the screw supplied, turning the outer section in the required direction to advance/retard the timing, then re-inserting the peg in the required holes once lined up. Each hole is 1° offset, so gives 2° of crank timing. A 1° cam key will allow even greater adjustment.

Once the cam timing has been set and the peg is in place, fit the lock tab/peg retaining plate, then the cam nut and tighten enough to pinch the cam wheel assembly so that the end float can be checked. This should be 0.003"-0.007".

The pulley should be torqued up to 61 lb ft. Bend the locktab up, but NOT a section covering the locating dowel. Make sure the crank pulley guide plate is fitted before refitting the damper pulley.

NOTE: The kit comes with a breather pipe, if not required, blank it off.

The cover is split to facilitate inspection of the belt. Regular inspection should be carried out on installations used in hostile or severe conditions. The belt should be replaced every 20,000 miles in normal road applications. The kit has been used on racing engines up to 9.500rpm.

Take care not to damage the belt when assembling, as this will obviously cause failure.

Related Technical Articles:
Classic Mini Cooper Camshaft drive kits page 39
Created: January 10, 2019
Camshaft to engine timing drive kits, single row chain, double row chains and belt drive kits are all options for the Classic Mini Cooper. Upgrade and high performance duplex chain kits with adjustable timing gears are also an option.
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