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Supercharger Drive System

Item
 Part #
 Description
1 N605904 Bolt
2 N620480 Nut
3 6A946 Cover
4 17K814 Alternator bracket assembly
5 N811268 Bolts (2 req'd)
6 8620 Accessory drive belt
7 N606543 Bolts (4 req'd)
8 6L266 Timing chain tensioner
9 6268 Timing chain (2 req'd)
10 6M256 Timing chain guide
11 6L266 Timing chain tensioner
12 6L253 Timing chain tensioner arm
13 6268 Timing chain (2 req'd)
14 N804958 Bolt (2 req'd)
15 6B274 Timing chain guide
16 N606527 Bolt
17 19D269 A/C compressor
18 N806184 Bolts (3 req'd)
19 6306 Crankshaft sprocket
20 6L253 Timing chain tensioner arm
21 12A227 Ignition pulse ring
22 6C086 Engine front cover
23 N806177 Bolts (8 req'd)
24 N806300 Studs (5 req'd)
25 6700 Crankshaft front seal
26 6316 Crankshaft pulley
27 N806165 Washer
28 W701512 Stud
29 8A528 Water pump pulley
30 N806282 Bolts (4 req'd)
31 N806177 Bolts (4 req'd)
32 8501 Water pump
33 N808102 Bolt
34 19A216 Beld Idler Pulley
35 N804178 Nut
36 N806300 Harness support bracket
37 N806300 Stud
38 N806155 Bolt
39
 6C315 Crankshaft position sensor
40 N806155 Bolt
41 6B288 Camshaft position sensor
42 N808920 Bolts (3 req'd)
43 6C254 Crankshaft extension support pulley
44 10153 Lower support bracket
45 N605909 Bolts (2 req'd)
46 8620 Accessory drive belt
47 N811268 Bolt
48 8B603 Belt idler bracket support
49 N808198 Stud
50 9N491 Hose and tube assembly

General Specifications

Item
 Specification
Accessory drive belt 6 ribs
Supercharger drive belt 8 ribs

Torque Specifications

Description
 Nm
 lb-ft
 lb-in
Belt idler pulley bolt 25 18 -
Drive belt tensioner bolt - 3.8L and 3.9L 82 60 -
Drive belt tensioner bolt - 4.6L 10 - 89
Drive belt tensioner bolt - Supercharged engine 25 18 -
Cooling hose mounting bolt 25 18 -
Belt idler support assembly bracket bolts 25 18 -
Air intake scoop bolts 25 18 -
Air intake scoop bracket bolt 25 18 -
Air intake scoop bracket nuts 25 18 -
Air intake scoop bracket throttle body nut 9 - 80
Exhaust gas recirculation (EGR) vacuum regulator solenoid bolts 10 - 89

Supercharger & Drive Components

Generator/Alternator & Pulley

missing missing missing


The Generator/Alternator Pulley is located to the drivers side lower front corner. The pulley itself is 8mm wide and is sold separately from the Alternator. This Alternator is specific to the 03-04 Cobra, where most Alternators mount up high in the middle of the Engine, the Supercharger occupies that area on the 03-04 Cobra, so it was moved. The Alternator requires a Upper and Lower Mounting Bracket, these are very rare and if priced right, should be purchased if found in good condition. There is also a small adapter that is used to turn the electrical connection 90̊, so it doesn’t interfere with anything, make sure you get one. I have heard of several owner having trouble with there Alternator, the main culprit is higher then expected RPM’s and heat. Many have suggested that using a Performance Pulley Kit, which slows down the Alternator, helps with this situation. I personally don’t think it is any one problem, more like a combination of heat, high electrical load, high under hood temps, and perhaps high RPM’s

Crankshaft Pulley Extension Bracket

missing missing


This is mounted to the front of the Crankshaft Pulley, and uses an additional Brace/Bracket to help control the heavy load placed on it by the Driven Pulleys it turns. The Support Bracket must be removed with the Pulley, by simply loosening three fasteners that hold it in place. Another useful tip, is that the Pulley is LEFT handed. To remove the Pulley you have to turn it clockwise. These Pulleys are tightened to 100Nm or 74lb-ft, so they require some effort to remove, and something to hold the Flywheel. Ford makes a nice little part, #303-673, that fits in place of the starter and holds the flywheel from turning.

This assembly is another hard to find item and should be purchased if you happen to run across one at a reasonable price.

Crankshaft Pulley Extension:2R3V-6C254
Lower Support Bracket2R3V-10153
Lower Bolts (2 Req'd)2R3V-N605909
Fly-Wheel Holder303-673

Beld Idler Support Bracket

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Above: This is a brand new Belt Idler Support Bracket, as furnished from Ford. As you can see it comes with the Tensioner and Idler Pulleys attached. You will need the 5-bolts to install it.


This piece is also refereed to by many as the Cross Brace or Cross Support or Bridge Support. This is a good sized Cast Aluminum piece that crosses the front of the Engine and straddles the Accessory Drive System so the Supercharger Drive System can operate in front of the other System. This brace allows the two Drive Systems to work in the same area, on different plains, without interfering with each other. This is also a part that is specific to the 03-04 Cobra Engine, and should be purchased if you run across one at a fair price. But be very careful, I have seen used ones go for more then a new one can be purchased for on sites like E-bay. Clearly a problem with the bidder not knowing his subject, it’s history or current selling price. For dress-up, I am going to have one of these Cross Braces polished, it is a smooth cast part and should polish out well, of-coarse this is for looks only and would not be required for a normal car. The Cross Brace is held in place with five bolts. It supports one Belt Tensioner and two Idler Pulley’s, all of which come with the cross brace when purchased from the factory.

Beld Idler Support Bracket2R3Z-6B209-BC
Idler Pulley2R3Z-6B209
Belt Tensioner2R3Z-8678
Mounting Bolts (3 Req'd)2R3V-N808920

Supercharger Idler Pulley***name&pics?

missing missing
Above: There is no way around this very, very important part of the Cobra Engine. It is impossible to run the Eaton Supercharger without this piece. Ford still sells them and I vote to just purchase it new and be done with it. The Used ones that do show-up are old and in need of repair, and will end up costing you more then the new one. Also don't forget to get the Bolts and Studs that go with the Front Cover.


This Small Pulley and Bracket are located right under and to the Driver Side of the Supercharger. This Small Bracket attaches to the Head and is used to support and mount the Idler Pulley and Alternator Upper Bracket. This is also the same Pulley many move up and in, to wrap the Drive Belt further around the Supercharger Pulley, for better traction. They sell a kit that moves this Idler Pulley up, and I have found it to be a worth while investment. The further you can wrap the Drive Belt around the Supercharger Pulley the better it will work, creating more surface tension and reducing belt slip. The Bracket is also used to help support the alternator, hence the name, Alternator Bracket Assembly. As you might also expect, this Bracket is specific to the 03-04 Cobra and again very hard to find on the open market. I would buy one if I came across one, so long as it was priced accordingly, just remember they are still available from Ford. There are too more Alternator Brackets, the upper and lower ones. These are almost never on E-bay, and should be purchased from the Local Ford dealer.

Alternator Bracket Assembly2R3V-17K814-AA
Mounting Bolt (2 Req'd)2R3V-N811268
Lower Alternator Bracket2R3V-10153-CA
Mounting Bolts (2 Req'd)2R3V-N605909
Mounting Bolts (2 Req'd)2R3V-N605909
Mounting Bolts (2 Req'd)2R3V-N605909

Supercharger Pulley

missing missing
Above: Left is a kit to make changing Supercharger Pulleys very easy. The Stock Pulley is removed and in it's place a new Collar that locks onto the shaft, then the new Supercharger Pulleys can simply bolt to the Collar. This makes changing the Pulley Sixe a snap. The above pulleys are 2.90" & 3.10", both are Diameter measurements. On the Right, is an example of a popular Supercharger pulley removeal & Instalation Tool. The Pulleys are pressed on to the Supercharger Shaft, and HAVE to be Pulled off or Pressed on. DO NOT HAMMER on the shaft, you will damage the Supercharger Shaft, Bearings , Coupler and Rotors.


The Supercharger Pulley is located on the snout of the Supercharger, pressed on to it’s shaft. Many owners change the mounting and size of the Supercharger Pulley. There are several manufacturers that make a bolt-on Pulley Kit. This allows the owner to quickly and easily change the Supercharger Pulley by loosening a few screws and removing the Pulley. No more press on fit, and using a Special Tool to remove the Pulley form the shaft. This new method uses a small metal collar that is pressed onto the shaft, then the Pulley is bolted to it. Now feature changes can be made very simply, by just removing 4 small screws. The reason many owners like to change the front Pulley is to increase the Rotor Speed of the Supercharger. Since this is a Positive Displacement unit, it delivers the same amount of air to the Intake System with each 360̊ rotation of it’s shaft. If you can speed up the Rotors, with out speeding up the Engine, you can get more capacity from the Blower without turning the Engine any more RPM. This extra capacity means more Boost Pressure, and more power. The stock Eaton Blower is factory set at 8 psi of boost, but many turn the Rotors faster to get 14-16 psi of Boost. This usually requires a Port Job on the Blower and a change to the Engines Tune, so be careful to not over step your Engines bounds.

Drive Belt



The stock Drive Belt is part number 8620, the same as the Accessory Drive Belt. But before you purchase one make sure you know which Blower Pulley you intend to run. By changing the Blower Pulley and or the location of the Supercharger Idler Pulley, you may have to purchase a new longer Belt. Belts are very common and can be purchased at any auto parts store of your nearest Ford parts counter. Just be certain to use the right size and a quality Goodyear or Motorcraft belt.

missing
ItemPart #Description
1-Supercharger pulley
28678Belt idler pulley
310344Generator pulley
48678Belt idler pulley
56C254Crankshaft extension pulley
66B209Belt tensioner
78678Belt idler pulley
88620Drive belt

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