Maintenance and Rebuild Overview
Maintenance and Rebuild Overview
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Rb20s are generally extremely reliable engines when maintained properly with quality parts. That being said these are 30+ year old engines that are generally pushed beyond their intended capabilities with unknown pasts. I highly recommend replacing or thoroughly inspecting any used parts or engines as they may be prone to failure due to age or condition.
This handbook includes parts and maintenance items that I personally recommend or have used on my personal engines as well as information and specs I have used to build my engines. There are a million different ways to do things and brands to buy from, but I believe these are the best techniques and parts.
RB20 Maintenance Items
RB20 Maintenance Items
Oil:
~4.5 Qts Oil Capacity for RB20DET
~4.0 Qts Oil Capacity for Non Turbo
Recommend 10w30 full synthetic for a freshly rebuilt engine
Hot climates or an engine with lot's of kms run 10w40 / 10w50 full synthetic
OEM service manual recommends 7.5w30 oil
Note: Engine Oil weight is mostly based on what clearances the engine was built to. The rule of thumb is the thinnest oil that maintains adequate oil pressure at operating temperature. If the engine is stock (or rebuilt within OEM bearing clearances) the OEM weight (or close to) it is what you would run. With older seals or a hotter climate a little heavier wont hurt anything. You should only run a significantly heavier oil if you have purposely built the engine to a looser bearing tolerance. For any oil questions reference the 540 - RAT page.
Oil Filter:
Any KA24 or VG30 oil filter will work from an auto parts store
OEM Nissan - PN: 15208-55Y0A , 15208-60U00 , 15208-55Y00 , 15208-H890C
Spark Plugs:
Stock Engine - NGK BCPR6E-11 - PN: 5632 - Gapped to 1.1mm / 0.043 in
High Performance - NGK BCPR7ES - PN: 6282 - Gapped to 0.8mm / 0.031 in
Belts:
Power steering belt (non HICAS pump) - PN: 3PK845
Power steering belt ( HICAS pump) - PN: 4PK845
Alternator / Water Pump belt - PN: 4PK860
Red Top 200zr - Alternator / Water Pump - PN: 4PK0890 (or 1 size smaller)
OEM A/C Compressor belt - PN: AY140-40925
OEM Alternator / Water Pump belt - PN: A1720-42L03
OEM Power steering belt - PN:
Other Fluids:
Coolant ~9L capacity - Green coolant
Transmission Fluid ~2.5 Qts capacity
Gear oil recommended MT-90 75W-90 GL-4 MTF
Other Items:
Fuel Filter 300zx - PN: 16400-N7605JP - larger capacity and better flow
Nismo Thermostat - PN: 21200-RS580
Timing Information:
Click here for all details on parts for timing refresh
RB20DET Idle speed - 600 rpm
RB20DET Base ignition timing (M/T) - 15 / 650 - BTDC / rpm
RB20DET Base ignition timing (A/T) - 20 / 650 - BTDC / rpm
Note: There is a No.1 Cylinder primary wire (black wire) to loop the timing light through near the connector on the igniter located on the top rear of the coil pack cover.
Quick Links For Rebuild Details
Quick Links For Rebuild Details
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