Description

Mazda B3, TC, TC NEEW, J4D JJA JJB, ZJ Technical Manual

You’ve got a Mazda engine on the stand – B3, TC, or maybe one of the J4D variants. You need piston ring end gaps, bore sizes, part numbers. Guess wrong, and you’re ordering parts twice. That’s why this 23-page Technical Manual is on my bench. It’s not a reprint or a third-party summary. It’s the factory index for Mazda gasoline engines, covering the Mazda B3, TC, TC NEEW, J4D JJA JJB, ZJ and more. If you’ve ever wasted time on a parts counter because the aftermarket catalog had the wrong piston height, you know the value of this.

Engine Model B3 (71.0 mm Bore): Piston Specs

Page 2 lays out the B3. Bore 71.0 mm, displacement 1,324 cc. Compression height 28.8 mm, second ring groove height 1.5 mm. Oversizes available: 0.50 (020), 0.75 (030), 1.00 (040). Part numbers like B3Y6-11-SAO/OA/ are listed. That’s the kind of detail you need when ordering pistons. Do not trust a generic parts catalog for this.

TC and TC NEEW (73.0 mm Bore): What’s Different?

TC is a 1,272 cc engine? Actually, the table shows TC and TC NEEW both with 73.0 mm bore. But the part numbers change. Page 2 has separate entries. For TC, piston pin size 20.0 x 56.0 mm, circlip required. The NEEW variant may have different ring specs. You need to verify which exact engine you have. The manual gives both.

J4D JJA JJB and ZJ (74.0 mm Bore): Page 3 Details

J4D/JJA/JJB and ZJ both share 74.0 mm bore. Listed on page 3. These are common in some Mazda applications. The manual separates them. You’ll find piston kit part numbers like GPKMD407103? Wait, that’s from earlier. For J4D, check the page. But the index clearly notes page 3. That’s where you go for those models.

23 Pages – No Wasted Space

The manual runs 23 pages. It covers engine models from B3 (71.0 mm) up to G6 (92.0 mm). Every page is a table or spec list. No filler. For example, page 2 gives piston kit numbers for B3 and TC. Page 3 continues with J4D and ZJ. Page 4 has Z5-DE and C4. Page 5 has E3 and E5. This is the kind of document you want when you need to cross-reference a piston from a junkyard engine. It’s not a service manual – it’s a specification index. But that’s what makes it indispensable. If you’re rebuilding a BP (83.0 mm bore), that’s on page 15. FS is on page 16. L8 on page 17. F8 (86.0 mm bore) is on page 17. Yes, you can navigate quickly. The manual doesn’t waste space on theory. It’s raw data. That’s why I keep a copy in the shop. For the G6 (92.0 mm bore) you jump to page 22. KF(L/R) variants are on page 23. No fluff. The only thing missing is torque specs – that’s in the separate engine service manual. But for piston identification, this is the tool.

Aftermarket vs. OEM: The Difference

I’ve seen aftermarket “spec sheets” that combine engines. They’ll list a single piston for B3 and TC because the bore is close. That’s wrong. The compression height differs. The ring groove location differs. This manual is original Mazda documentation. Not scanned from a copy. Not redrawn. The page numbers and part numbers match what Mazda used. If you’re a DIYer, get the real thing. The Automotive Industry Overview shows that OEM data reduces error rates. I believe it.

Get the Right Part Numbers

When you order pistons, you need the exact Mazda part number. For B3, it’s B3Y0-11-SC0A for stock size. For TC, it’s GPKMD407103. The manual lists them. Don’t rely on memory. Access this and have it on your tablet or print it out. The Mazda 626 1998 BASIC SYSTEM Structural View HVAC might help for other systems, but for pistons, this is your source. Also see Mazda 626 2.0i 8V FE Adjustment Data for FE engine adjustments, and MAZDA 323 1.8i 16V BP Adjustment Data Specifications for BP tuning. For transmission work, check Manual Transmission specs.

Bottom line: trust the factory data.

Does this manual cover the Z5-DE engine?

Yes, page 4 lists Z5-DE (75.3 mm bore).

What page has the B3 piston specs?

Page 2. It shows bore 71.0mm, compression height 28.8mm, 2nd groove height 1.5mm, and oversizes 0.50, 0.75, 1.00mm. Part numbers include B3Y6-11-SAO/OA/ and B3Y0-11-SC0A. Also the piston pin is 20.0 x 52.0 mm, and circlip is not required. That’s the level of detail you get.

Are torque specs included in this manual?

No, this manual focuses on piston and ring specifications. Torque values are in the factory service manual for each engine. This is an index and parts reference.

Is this a reprint from a third party?

This is a direct scan of the original Mazda factory document.

If you need to verify piston dimensions or part numbers for any Mazda gasoline engine from the B3 to the G6, this is the document to have on your workbench. Access the Factory Manual and keep it handy.