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1976-85 13B Rebuild Parts

To order any of these parts, go back to the main motorsports webpage and login. Click on the Order More Item icon under the QUICK ORDER section on the top right of the Motorsports webpage (while logged in). You will see several blank lines at a time, to type in your part numbers. Click the SUBMIT button at the bottom of the page. This will add the items and return to your cart. You can repeat the process if you have more items to add.

The following parts are recommended for all 1976-85 13B rebuilds. Certain upgraded parts have been substituted, but may not be stock. These are the parts normally sent out when people want to order a basic rebuild kit.

The parts in the top blue section may be ordered as one part number K-8485-3B-STK. The same kit, but with carbon apex seals and correct springs substituted can be ordered as K-8485-3B-RCE. Parts need to be ordered individually if ordering ceramic apex seals.

DESCRIPTION PART NUMBER QTY NOTES
APEX SEAL - STOCK N304-11-300A 6 Click here for optional Apex Seals & Springs
APEX SPRING 1757-11-304 6  
CORNER SEAL N225-11-321 12  
CORNER SEAL SPRING NF01-11-C24 12 Washer type spring from 93-95 RX-7. Retains strength under high temperatures better than wire type design.
CORNER SEAL PLUG N201-11-322 12  
SIDE SEAL 8871-23-151 12 Precut
SIDE SEAL SPRING 0820-11-317 12  
OIL SEAL SET (STEEL) N3Z1-11-S10A 4 1 set is 1 inner and 1 outer. Needs 4 sets per engine.
O-RING - OIL SEAL OUTER 0820-11-341 4 Green
O-RING - OIL SEAL INNER 1202-11-343 4 Green - do not use 8341-11-343 black o-rings.
SPRING - OIL SEAL FRONT INNER N225-11-351 2  
SPRING - OIL SEAL REAR INNER N225-11-361 2  
SPRING - OIL SEAL FRONT OUTER 4352-11-353 2 Competition part. Heavy-duty spring provides increased pressure
SPRING - OIL SEAL REAR OUTER 4352-11-363 2 Competition part. Heavy-duty spring provides increased pressure
ENGINE GASKET SET N304-89-100A 1 84-85 set. Will work for earlier cars but intake and exhaust manifold gaskets might be different. Includes O-ring set.
MAIN SEAL, FRONT 0820-10-605 1  
MAIN SEAL, REAR 1668-10-556A 1  
PILOT BEARING N326-11-D03 1  
PILOT BEARING SEAL 1881-11-404A 1  
       
OPTIONAL INSTALLS  
DESCRIPTION PART NUMBER QTY NOTES
APEX SEAL - CARBON 4801-11-301 6  
APEX SEAL SPRING - FOR CARBON ZR03-11-304 6 For use only with Carbon Apex Seal
       
APEX SEAL - CERAMIC 1PC 3mm 0000-01-9105 2 Comes with precut dual apex seal springs. 3 per box
APEX SEAL - CERAMIC 2PC 3mm 0000-01-9115 2 Comes with precut dual apex seal springs. 3 per box
       
CORNER SEAL SPRING - STOCK 12A 1202-11-323A 12 Wire type. Use only if stock springs are required by class. Normally the washer type, NF01-11-C24, listed above will retain strength better under high temperatures.
       
ROTOR BEARINGS - STOCK 1011-11-111 2 STOCK
ROTOR BEARINGS - COMPETITION 4801-11-111 2 Competition bearings have 0.01 inch deeper oil groove and provide 0.0005 inch more clearance than stock bearings. Thinner overlay material improves bearing service life.

 

      
MAIN BEARINGS - STOCK 0820-10-502B 2 STOCK
MAIN BEARING - COMPETITION REAR 4801-10-502 1 Use in place of stock rear bearing. 3-window type. Recommended for any engine used at 8000 rpm and above. Increases oil flow to the inside of eccentric shaft and to rotors.
       
ECCENTRIC SHAFT N304-11-400 1 DISCONTINUED - LOW STOCK
       
ROTOR HOUSING FRONT AND REAR N304-10-100C 2 1984-85 STOCK
ROTOR HOUSING FRONT 4801-10-100 2 Peripheral port. NO LONGER AVAILABLE
       
 Use pdf catalogs online to search for intermediate housings.