Starter Ring Gears

Steel flywheel ring gears for a wide range of vehicle applications. We hold a large selection of 'new old stock' Francis B Willmott Ltd. 'Shrunk-on' and 'Bolt-on' rings gears as well as many newly re-manufactured gears for popular makes and models. For guidance on the part numbering system - that denotes width, number of teeth and pinion entry chamfer - please see the 'Help and Instructions' sections below. You can search stock by Flywheel diameter, outer diameter, number of teeth as well as vehicle make and model.

Help & Instructions

Ring Gear Help and Instructions

Other Notes:

MW, EP, SB etc = Special Application or Vehicle. i.e. E115F - suitable for Alvis, EP115F - suitable for Perkins

/10, /12, 12/14, 2 ½ = Pitch or Number of Module

Part number example G138NE = 7/8” wide, 138 teeth, no entry

Fitting Instructions for ‘Shrunk-on’ Ring Gears Reproduced from an Original Catalogue

Replacement of starter ring gears should only be undertaken by professionals with the proper equipment

Damaged flywheel gear teeth not only cause noisy engagement and running, with the possibility of a blind spot at which the teeth are so bad that the starter pinion fails to engage altogether, but also entail a likely risk of the starter-pinion being wedged and resulting in breakage of drive-end bracket and bent armature shaft.

In some cars the gears are integral with the flywheel, but it is not necessary to scrap the flywheel when gear teeth are hopelessly damaged. Replacement ring gears can be fitted on the flywheel when the old teeth have been machined off, and an accurate spigot turned to receive the ring.

The flywheel should be mounted in the lathe chuck, with particular care that it is dead central. The old teeth are then machined off flush and the spigot turned to the dimensions specified. The diameter of the spigot is usually .020" greater than the bore of the ring, but the ring bore should not be measured for the diameter required, as it may be slightly out of round. A micrometer gauge to measure up to 24" can be used with advantage or a fixed gauge can be made for each of the spigot diameters specified for popular vehicles.

When a gear has been fitted previously to a flywheel, it is very important that care is exercised in its removal. To attempt to remove simply by knocking off is destructive, in that this action may seriously damage the small lip which is present on a number of flywheels. It is recommended that the old gear be first split by drilling or hacksaw, finally by a chisel, thus enabling the gear to be easily removed over any lip. Care must be taken to see that the starter pinion clears the teeth adequately when in the restricted position, and that slight backlash is present when engaged.

Whatever method be used to expand the gear before fitting it must be heated slowly and uniformly, and on no account to a greater temperature than 290°C., or 554°F. A thermostatically controlled muffle or heater fired by gas or electricity is the one method by which a safe and efficient expansion is obtained. The use of a blow lamp or similar is not recommended.

After placing the ring in position on the spigot it should be tapped well home against the shoulder with a copper mallet or soft drift and then left to cool gradually in air. If cooling is hurried by quenching with water or by air jet, uneven stresses will result and the ring may crack. No concern need be felt about tapping the gear into position, because any slight " ovality" which makes this necessary disappears whilst the gear shrinks on the flywheel.

The correct position for the chamfer on the ring teeth must be carefully observed. The chamfer should be on the leading edge of the teeth in the direction of rotation, and should be on the side of the ring to which the starter pinion approaches. The leading edge of the pinion teeth will then engage the chamfer and enable the pinion to slide easily into mesh, even when the teeth meet end on.

It is always advisable to examine the pinion shaft to see that it is not bent, and also that the starter pinion is free from damage and that it can move freely into the engaged position with the ring gear.

Special Note - Where a gear is used that is narrower than the original teeth on the flywheel, special care should be taken that the entry side of the replacement gear is in the same position as the entry side of the original teeth on the flywheel. For example, if using a gear 11/16" wide to replace flywheel teeth 1" wide, first turn off flywheel teeth to root diameter (bottom of teeth) and then turn flywheel back 11/16" from the original entry side of the flywheel teeth and to the turn-diameter marked on the bore of the replacement gear. This will put the entry side of the replacement gear in the same position as the entry side of the original teeth in the flywheel.

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Search in Ring Gears

Search by one or more dimension or specification

Turn Diameter

Outer Diameter

Teeth

Tolerance

We supply Starter Ring Gears for all makes of vintage and classic vehicle from AEC and Allis-Chalmers to Volkswagen and Volvo. To assist with part identification, we have compiled application data for a selection of the most popular makes and model of vehicle. Please search below by make, then model.

Make

Model & Year

If your make or mode of vehicle is not covered by our search facility, please email with details of your requirement (Make, Capacity, Bore Size, Model and Year) and we will provide links to the correct parts where available.

Photograph for illustrative purposes only - not actual product shown

CEP SRG W E80R-A - 80 tooth Starter Ring Gear, 11/16" thick, with an outer diameter of 10.18 for Jowett

From £92.50 (£111.00 inc. VAT @ 20%)

High carbon steel Starter Ring Gear with hardened and tempered or flame-hardened teeth. Please count the number of teeth on your current flywheel and measure the inner and outer diameters as well...

Comparable to other manufacturer part numbers - 6239X11

CEP - Other - Starter Ring Gears

Teeth	Turn Diameter	Outer Diameter	Thickness
80	9.359	10.18	11/16"

Orderline: +44 (0)1684 212882

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Ring Gear Help and Instructions

Other Notes:

Fitting Instructions for ‘Shrunk-on’ Ring Gears Reproduced from an Original Catalogue

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