Description

Nissan H5M-R Service Manual – Factory Specs for the Manual Transaxle

If you are tearing into a Nissan H5M-R manual transaxle without the factory documentation, you are gambling with your time and parts. I have seen guys cross-thread a synchro hub because they guessed the preload. A Nissan H5M-R Service Manual tells you exactly how much torque to put on the ring gear bolts and what bearings need shimming. This is not a reprint from some third-party site that OCR-scanned the pages backward. This is the genuine 50-page OEM document, straight from Nissan’s engineering office. You need the oil capacity? 3.65 liters of SAE 75W-90 or DEXRON II above -18°C (0°F). That is on page J2-7. You need the removal steps? Page J2-10 walks you through every bolt and bracket. If you are a home garage guy who wants to avoid blowing the differential, this manual is your insurance.

Specifications and Oil Capacity

The opening section of this manual (page J2-3) lays out the gear ratios, final drive ratio (4.105), and the synchromesh system. Forward gears are standard synchromesh; reverse gets a double-blocking synchromesh – not a common design. The oil specs are printed right on page J2-2: all-season SAE 75W-90, or API GL-4/GL-5 SAE 80W-90 above freezing. Capacity is 3.9 US quarts. If you use the wrong oil, the double-cone reverse synchro can chatter. The manual calls out ATF DEXRON II as an alternative for cold climates. That kind of detail is missing from aftermarket summaries.

Does the H5M-R Manual Cover the Disassembly Steps?

Yes, and it does it in the order your hands need to follow. The transaxle section starts with preparation – special tools you need, like a puller for the input shaft bearing. Then removal (J2-10) covers draining the oil, disconnecting the shift linkage, unbolting the transaxle from the engine. Disassembly starts at J2-12 and goes through every snap ring, shim, and bearing. The differential section is separate: disassembly on J2-21, inspection on J2-27, adjustment on J2-27. You get the shimming procedure for the side bearings – that is something most DIYers screw up because they don’t have the factory end-play spec. The manual gives it.

3 Systems Detailed in This Manual

First: the transaxle itself – removal, disassembly, inspection, assembly, installation. Second: the differential – including adjustment and shimming. Third: the shift mechanism – removal/installation on J2-48 and inspection on J2-49. Each system has its own index in the manual, so you are not flipping through generic chapters. The structural view on J2-4 shows you an exploded diagram of every gear, shaft, and bearing. The power flow diagram on J2-5 explains how torque travels from input to output for each gear. That is the kind of theory that helps you diagnose why fifth gear is popping out.

Follow the Power Flow and Troubleshooting Guide

Before you take anything apart, read the troubleshooting guide on page J2-6. It lists symptoms – hard shifting, noise in gear, oil leaks – and the probable causes. Then it tells you which section to go to. For example, if you get a whine in third gear, the guide points to worn synchromesh or a damaged gear. That saves you from pulling the whole transaxle when the issue is just the shift fork. The power flow diagram will also show you that reverse uses a separate idler gear – make sure you align the marks or you will have a grinding mess on the first test drive.

Source Authenticity: OEM vs Aftermarket

I have seen aftermarket manuals that tell you to remove the transaxle by unbolting the starter without mentioning the clutch slave cylinder bleed – that is how you drag dirty fluid into the release bearing. This Nissan H5M-R Service Manual is the factory document. Every torque value, every clearance, every oil capacity came off Nissan’s engineering floor. The PDF is scanned from the original binder – you get the same pages a dealer tech would have used in the 1990s. If you are serious about not turning your transaxle into a paperweight, get the real thing. Related manuals you might need: Nissan Xterra 2005 Service Manual – OEM Factory Spec, Nissan 60 1967 Service Manual – Original Factory Bulletin, and Nissan L60, L60-U, KL60-U 1968 Service Manual – Factory Specs. For general background on manual transmissions, see Manual Transmission on Wikipedia, and for automotive industry standards check Automotive Industry Overview.

Does this manual include torque specifications for all bolts?

Yes. The assembly procedures from page J2-24 onward list torque values for every fastener – housing bolts, ring gear bolts, bearing cap bolts, shift fork bolts. You do not guess, you torque. That eliminates stripped threads in the aluminum case.

How many pages does the manual have?

50 pages.

Is this manual specific to the H5M-R model only?

Yes. The H5M-R was used in certain Nissan models (like the F2 turbo engine). The manual covers only this transaxle. It does not mix in other models. That is the advantage of a factory service manual – it is one transaxle, one book, no generic procedures.

Can I use this manual for other Nissan manual transaxles like the RS5F30A?

No. The H5M-R has a different internal design, especially the reverse double-blocking synchromesh and the differential shimming. Using this manual for a different transaxle will lead to wrong specs. Get the correct OEM manual for your specific model. The contents of this manual are 100% specific to the H5M-R – from the gear ratios to the oil capacity.

You have the oil spec, the torque sequence, the power flow, and the troubleshooting. The only missing piece is the piece of paper that holds it all together. Access the Factory Manual now and get the full 50 pages in PDF form – ready to print or view on your tablet next to the workbench. No guesswork, just factory engineering.