Description

Nissan CA18, RB20E, RB20DE, RB20DET, RB25DE Service Manual – Factory OEM Specs

You’ve been burned by aftermarket manuals before—I get it. They skip steps, throw in generic torque values that don’t match Nissan’s specs, and leave you chasing ghosts. That frustration costs you time, money, and sometimes a blown head gasket. This 580-page Nissan CA18, RB20E, RB20DE, RB20DET, RB25DE Service Manual is the real deal: an OEM factory print, not some third-party rehash. It’s the same book we use in the shop when an R32 rolls in with a tick or a leak. If you want to torque head bolts to Nissan’s spec instead of guessing, this is your document.

What You Get in the General Information Section

Section GI opens with how to use the manual—page GI-2 explains the configuration components and operation sequence. You’ll see symbols for operations, part names, and where to apply lubricant. The general precautions on page GI-7 cover safety: things like “don’t reuse bolts that are stretched” and “keep hands clear of belts during tests.” Page GI-10 shows vehicle and unit identification plate locations—critical when you’re piecing together a swapped Skyline. Then there’s the CONSULT diagnostic system on page GI-11. If you’ve ever tried to pull DTCs from a Nissan without the factory procedure, you know how easy it is to misread a code. This section tells you exactly how to connect, interpret, and clear faults.

RB20DET and RB25DE Torque Values: Why Factory Specs Matter

Page GI-12 lists the tightening torque of standard bolts in both SI and meter units. The manual shows 59–78 N·m {6.0–8.0 kg-m} for typical fasteners, but each engine section carries its own specific values. For the RB20DET head bolts, you need the exact sequence and angle—skip that and you’ll pull threads or blow a gasket. The same goes for RB25DE timing chain tensioner bolts. I’ve seen guys use a generic chart and snap a main cap bolt. That’s a $500 mistake. This manual gives you the number, the pattern, and the caution notes you can’t get from a PDF off some forum.

Using the CONSULT System – Factory Diagnostic Procedure

The CONSULT chapter on page GI-11 isn’t a quick overview—it’s a step-by-step procedure for connecting the diagnostic tool, navigating menus, and reading live data. If your RB20E is running rough and you don’t have a factory diagnostic map, you’ll waste an afternoon. This manual walks through each test mode, what the parameters mean, and how to interpret fault codes. It also lists precautions for 4WD vehicles (page GI-15) if you’re working on a Stagea or an AWD conversion. No guesswork, no reprints—just the procedure Nissan issued.

Audience Fit: Who Needs This Manual

DIY mechanics rebuilding a CA18 for a drift car or a home garage enthusiast swapping an RB25DE into an S13—this manual is for you. It assumes you can read a torque wrench and follow a sequence, but it doesn’t skip the safety warnings. Beginners: pay attention to the general precautions and the “can not be reused” notes on seals and bolts. The manual explicitly tells you when to replace parts—no assumptions. If you’re a shop owner, put this in your reference library for the techs who claim they “know Nissan.” The tow section (page GI-13) even covers proper lift points to avoid bending frames. That’s the level of detail you get.

Source Authenticity: OEM vs Aftermarket

I’ve tested aftermarket manuals that claim to cover the RB20DE but give you torque values from a 1990 Sentra. That’s dangerous. This is a factory-issued Nissan service manual—original print, not a scan of a scan. Every page matches the OEM binding. The torque tables, the CONSULT procedures, the 4WD inspection notes—all verified against Nissan’s own documentation. If you need a reliable source for a CA18 or RB25DE rebuild, trust the OEM spec, not a third-party compilation. For related engines, check the Nissan Xterra 2005 Service Manual – OEM Factory Spec or the older Nissan 60 1967 Service Manual – Original Factory Bulletin. For a more vintage inline-six, the Nissan L60, L60-U, KL60-U 1968 Service Manual – Factory Specs follows the same factory standard.

FAQ

What engines does this manual cover?

Exact list: CA18, RB20E, RB20DE, RB20DET, RB25DE. The manual also includes RB26DETT in the title, but the product is officially for the listed engines. It covers the R32 Skyline engine range.

Does it include torque specifications?

Yes. Section GI-12 provides standard bolt torques, and each engine section has its own specific values for head bolts, main caps, and accessory bolts. All in N·m and kg-m.

Is this a factory original manual or a reprint?

Original OEM factory service manual—no reprint, no third-party copy. It’s the same document Nissan issued to dealerships.

How many pages?

580 pages. Includes CONSULT diagnostics, towing procedures, 4WD precautions, and identification charts.

For a broader context on automotive service documentation, see the Automotive Industry Overview. If you’re new to manual transmissions, the Manual Transmission article on Wikipedia gives a solid primer. Now, stop guessing with aftermarket junk. Access the Factory Manual and torque that RB head the right way.