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Starter Ring Gears

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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. 

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.

Files

Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W S146/10R - 146 tooth Starter Ring Gear, 7/16" thick, with an outer diameter of 14.748 for Sunbeam-Talbot

From £123.50 (£148.20 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 - P77169

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
146 13.167 14.748 7/16"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W S156/12NE - 156 tooth Starter Ring Gear, 0.437" thick, with an outer diameter of 13.056 for Austin

From £69.60 (£83.52 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 - 611328

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
156 11.607 13.056 0.437"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W S90/10F - 90 tooth Starter Ring Gear, 0.317" thick, with an outer diameter of 9.151 for Renault

From £65.20 (£78.24 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 - 6023371

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
90 7.886 9.151 0.317"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W S93R - 93 tooth Starter Ring Gear, 0.490" thick, with an outer diameter of 11.775 for Morris

From £80.00 (£96.00 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 - X22619

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
93 10.37 11.775 0.490"
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CEP SRG W S97R - 97 tooth Starter Ring Gear, 7/16" thick, with an outer diameter of 12.305 for Rover

From £64.38 (£77.26 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 - 244346

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
97 11.441 12.305 7/16"
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Photograph for illustrative purposes only - not actual product shown

CEP SRG W S98/10F - 98 tooth Starter Ring Gear, 0.395" thick, with an outer diameter of 10.041 for Simca

From £62.50 (£75.00 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 - 14707V

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
98 8.9 10.041 0.395"
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Photograph for illustrative purposes only - not actual product shown

CEP SRG W SA112/12NE - 112 tooth Starter Ring Gear, 3/8" thick, with an outer diameter of 9.488 for Simca

From £51.25 (£61.50 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 - 32437G

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
112 8.51 9.488 3/8"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SA117/10R - 117 tooth Starter Ring Gear, 3/8" thick, with an outer diameter of 11.875 for Vauxhall

From £71.07 (£85.28 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 - 7083948

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
117 10.638 11.875 3/8"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SA122/10R - 122 tooth Starter Ring Gear, 3/8" thick, with an outer diameter of 12.37 for Vauxhall

From £66.98 (£80.38 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 - 7079831

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
122 11.132 12.37 3/8"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SA127/10F - 127 tooth Starter Ring Gear, 3/8" thick, with an outer diameter of 12.746 for Austin

From £85.50 (£102.60 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 - 12H2186

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
127 11.494 12.746 3/8"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SB104R - 104 tooth Starter Ring Gear, 7/8" thick, with an outer diameter of 13.13 for Wolseley

From £156.60 (£187.92 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...

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
104 12.208 13.13 7/8"
Special Notes:
Flange type with 1/2" wide teeth
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SB117R - 117 tooth Starter Ring Gear, 1/2" thick, with an outer diameter of 14.762 for Daimler

From £171.69 (£206.03 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 - 119169

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
117 12.77 14.762 1/2"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SB95R - 95 tooth Starter Ring Gear, 15/16" thick, with an outer diameter of 12.055 for Morris

From £121.80 (£146.16 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...

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
95 10.95 12.055 15/16"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SC93R - 93 tooth Starter Ring Gear, 0.392" thick, with an outer diameter of 11.81 for Citroen

From £95.00 (£114.00 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 - D533/1

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
93 10.705 11.81 0.392"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SD105/10F - 105 tooth Starter Ring Gear, 0.387" thick, with an outer diameter of 10.664 for Datsun

From £58.90 (£70.68 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 - 12312-18000

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
105 9.467 10.664 0.387"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SD81R - 81 tooth Starter Ring Gear, 5/8" thick, with an outer diameter of 10.195 for Austin

From £98.50 (£118.20 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 - IA1785, 1A2266

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
81 8.895 10.195 5/8"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SE92RL - 92 tooth Starter Ring Gear, 11/16" thick, with an outer diameter of 11.68 for Singer

From £135.00 (£162.00 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...

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
92 10.937 11.68 11/16"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SF81R - 81 tooth Starter Ring Gear, 3/4" thick, with an outer diameter of 10.176 for Austin

From £98.50 (£118.20 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...

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
81 9.22 10.176 3/4"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SF93R - 93 tooth Starter Ring Gear, 1 1/8" thick, with an outer diameter of 11.93 for Riley

From £165.00 (£198.00 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...

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
93 10.99 11.93 1 1/8"
Special Notes:
Flange type with 3/4" wide teeth
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SR93R - 93 tooth Starter Ring Gear, 0.429"/0.437" thick, with an outer diameter of 11.805 for Rover

From £68.20 (£81.84 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 - 527493

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
93 10.89 11.805 0.429"/0.437"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SS100F - 100 tooth Starter Ring Gear, 0.475" thick, with an outer diameter of 12.618 for Austin

From £95.30 (£114.36 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 - 62H138

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
100 11.498 12.618 0.475"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W ST115/10F - 115 tooth Starter Ring Gear, 0.350" thick, with an outer diameter of 11.59 for Toyota

From £41.35 (£49.62 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 - 13453.20010

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
115 10.226 11.59 0.350"
Product Image
Photograph for illustrative purposes only - not actual product shown

CEP SRG W SV142/12NE - 142 tooth Starter Ring Gear, 0.355" thick, with an outer diameter of 11.93 for Vauxhall

From £48.70 (£58.44 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 - 8930049

CEP - Other - Starter Ring Gears
Teeth Turn Diameter Outer Diameter Thickness
142 10.87 11.93 0.355"