Front Engine Pieces, Counterweights, Front Covers

Dowel Pins and Tension Bolts

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Front Engine Assembly_
See images above/below	Description	All-85	86-92	93-95
(1)	Thrust Plate	11-5040-1011	11-5040-1011	11-D520-N390
(2)	Thrust Bearing	11-505B-0813	11-505B-0813	11-D540-NF01
(2)	Thrust Bearing (competition)	78-1840-0822	78-1840-0822	xxx
(3)	End Spacers	(see chart below)
(4)	Bearing Plate	11-5010-1011	11-5010-1011	11-D510-NF01
(5)	Thrust Washer	11-5070-1011	11-5070-1011	11-D530-NF01
(6)	Oil Pump Drive Gear	11-551A-0839	11-D750-N326	11-D750-N326
(7)	Drive Gear	11-5310-0839	11-5310-0839	11-5310-0839
.....	Key Way (front)	60-5710-9923	60-5710-9923	60-5710-9923
....	Key Way (rear/flywheel)	11-7050-0820	11-7050-0820	11-7050-0820
(8)	Front Pulley Bolt Washer	22-8000-9956	22-8000-9956	22-8000-9956
(9)	Front Pulley Bolt	11-611B-0820	11-420B-N318	11-4060-N3C1
	Description	All-85	86-92	93-95
(10)	Front Bolt "O-ring"	not used	10-1105-9954	10-1105-9954
(11)	Front Eccentric Thermostat	not used	11-D150-N326	11-D150-N326
Replacement for above thermostat, if you choose to not use it			11-PLUG (for 86-95)
(12)	Eccentric Thermostat Spring	not used	11-D170-N326	11-D170-N326
......	Oil Pump Gear	14-141A-0839	14-1430-N326	14-1430-N326
.....	Oil Pump Chain	14-1420-0839	14-1510-N326	14-1510-N326

Important note on counterweights: The front and rear (or flywheel) counterweights PLUS the rotors make a balanced assembly. The years / rotors we list in the following charts are for PRODUCTION years of the rotors / counterweights! A lot of mixing can be done when building engines, providing the rotors and counterweights match. By this we mean 89-92 non-turbo rotors (lighter weight, higher compression) can be used in an 84-85 13B engine as long as the matching front and rear counterweights are used also, for instance.

Balancing of the assembly is normally not needed, as long as the components are matched.

Front Counterweights
Engine/Rotors	Year/Rotors	Part Number
12A	76-80	11-5110-1881
12A	81-82	No Longer Available New- call to ask for used part
12A	83-85	11-511A-N226
13B	74-85	11-5110-N304
13B	86-88	11-D61A-N326
13B	89-92	11-D610-N350
13B	93-95 A/T	11-D610-N3A8
13B	93-95 M/T	11-D610-N3A7

Stock OEM have the "counterweight" built into the flywheels. The rear counterweights listed here are needed when using aftermarket light flywheels that bolt to the counterweight. All of our light flywheels are supplied with the correct counterweight to match the engine you are using.
See our FAQ Identifying Flywheels if you are not sure what year of flywheel you have.

Rear Counterweights
Engine/Rotors	Year/Rotors	Part Number
12A	79-82	11-751A-1883
12A	83-85	11-751A-N226
13B	76-85	11-751A-1029
13B	86-88	11-521A-N327
13B	89-95	11-5210-N351
You may want to read our FAQ on Identifying Rear Counterweights
All Rotary - Flywheel Nut		11-711B-0810

Engine Front Covers
Year & Engine	Part Number	Generic Pictures
79-85 12A	No Longer Available
84-85 13B GSLSE	10-A600-N304
86-88 NON-TURBO	10-500B-N326
86-88 TURBO	10-500B-N318
93-95	10-500B-N3A1
RX-8	10-500G-N3H1

Tension Bolts
12A	Long	10-452A-1015
	Short	10-451B-1015
13B	Long	10-E520-N326
	Short	10-E510-N326
	Long Ribbed	10-E61A-N350
	Short Ribbed	10-E51B-N350
	Seal for any of the above tension bolts (each) 74-95	10-4550-0839

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