1976-85 13B Rebuild Parts

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.