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13B-FC (2nd gen RX-7) heavy duty internal seal & spring rebuild kit
Complete internal heavy duty seal and spring rebild kit for Mazda 13B Turbo and Non-turbo FC (2nd gen) RX-7 engine. Includes our special heavy duty water seal kit.
Your Price: $1,646.61


* denotes required field

Engine Series*
Apex Seals*
Rotor Bearings*
Main Bearings*
New Rotor Housings*
Oil Control Rings*
Oil Pan Gasket*

Detailed Description

This kit provides all the typical minor consumable internal seals and springs required for a quality rebuild. All parts are genuine Mazda factory, except for the substitution of our Heavy Duty Water Seal Kit. Kit includes apex seals (OEM 2mm, 2 piece), long & short apex seal springs (OEM) side seals (OEM), FD side seal springs (OEM), corner seals with plugs (OEM), FD corner seal springs (OEM), oil control ring o-rings (OEM), oil control ring springs (OEM), Heavy Duty Water Seals, front cover gasket (OEM), front cover o-ring (HD), front cover o-ring backup washer where applicable (OEM), oil pedistal o-rings (HD), rear stationary gear o-ring (HD), front & rear main seals (OEM) and more.

Two notable upgrades are the use of FD (3rd gen) 13B-REW corner seal springs and side seal springs.

The options above allow you to add Bearings, Rotor Housings and Oil Control Rings to your order, which are otherwise not included. Bearings are generally replaced on a quality rebuild, but not always required depending on the condition of the existing bearings. Installation requires a press and special adaptor. Rotor Housings are very, very expensive but are mandatory for any rebuild expected to last as long as the original engine. Used housings should be carefully inspected prior to re-using, in any event. Oil control rings have a fairly long life and can be re-used if within specification (0.020 inch or 0.5mm) of wear. Just measure the shiny part on the wear surface. While the rings themselves are not included in the basic rebuild kit, please note that the oil control ring o-rings and oil control ring springs ARE included.

If you do any price shopping, please remember that many places will sell you a rebuild kit with substitute aftermarket parts that are inferior to OEM. The most frequent substitutions are apex seals and oil control ring o-rings. Please don't fall for this. No aftermarket metallic (as opposed to ceramic) apex seals or oil control o-rings come remotely close to performing as well as the OEM parts. This is why we don't offer them. The only substitutions we typically recommend are premium ceramic apex seals (only for extreme applications) or the Heavy Duty Water Seal Kit (for all applications), which we tested for 7 years in a variety of engines on the street and track before offering to the public. For $99 less, we can substitute the stock water seals with this kit, if you prefer.

We normally do not recommend the use of the stock oil pan gasket because it tends to leak worse than silicone sealer alone, but it is available for those who really want one.

2nd Generation RX-7s come in two series, called Series 4 (86-88) and Series 5 (89-91). They are further divided into Turbo and Non-turbo models. Other than the compression ratios, turbo and no turbo engines are very similar. The turbo rotor housings are a good upgrade for the non-turbo cars due to the absence of noise baffling in the exhaust sleeves, making them flow better. Series 4 vs. Series 5, however, is a bit more involved. As far as basic rebuild kits go, the only real concern is that they have different front cover gaskets and the front cover o-ring has a backup washer that fits into a machined groove (you cannot add it to an S4 without machining). With regards to rotor housings, the S4 and S5 engines have different spark plug locations that effectively change your ignition timing, so we recommend sticking to the proper series housings. S5 engines have lighter rotors and counterweights, so do not mix and match, though a straight swap of the entire rotating assembly is fine.

Additional Information

>> Click here to view a video overviewing the internal engine parts

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