Description

Acura Integra Service Manual – 1989-1993 Engine and Specs

If you are rebuilding an Acura Integra from 1989 to 1993, you have probably been burned by aftermarket manuals that skip the numbers you actually need. You end up guessing valve clearances, cylinder head warpage limits, or torque sequences. That gamble can warp a head or snap a bolt. This original factory Acura Integra Service Manual section gives you the exact standards the engineers wrote. It covers the engine block, cylinder head/valve train, lubrication, cooling, and fuel/emission systems. Eighteen pages. No reprint, no generic access – these are the direct OEM pages from Honda’s own documentation.

3 Reasons to Trust This Acura Integra Service Manual

First, the specs are from the original 1989-1993 model run. Second, each measurement – valve stem O.D., cam lobe height, spring free length – comes with both standard and service limit values. Third, the manual covers both the B17A1 and B18A1 engines side by side. If you need to know the maximum variation between cylinders at 250 rpm and wide open throttle, it is on page 3-2. That page alone has saved me from tearing down a good motor twice.

Standards and Service Limits: Critical Measurements

This section (starting around page 3-1) lists everything from cylinder head warpage to valve guide installed height. You get intake and exhaust valve clearance cold: 0.15–0.29 mm for intake, 0.12–0.26 mm for exhaust on the B17A1. The service limits tell you when to replace. If you are doing a valve job, you need the seat width: 1.25–1.55 mm new, 2.0 mm limit. That matters. Guessing leaves cracks.

Cylinder Head/Valve Train for B17A1 and B18A1

Section 6 of this manual dives into the cylinder head and valve train. It covers both engines separately. You get tappet-to-holder oil clearance, camshaft end play, and total runout. For the B18A1, the valve stem O.D. is 5.470–5.485 mm intake, 5.450–5.465 mm exhaust. The stem-to-guide clearance limits are 0.08 mm intake and 0.11 mm exhaust. If you have ever pulled a head and wondered if the guides are shot, these numbers give you a definite answer. No guessing.

Get the Right Torque Data

Torque values are not listed in the OCR excerpt, but you will find them in the standard service limits tables. This manual uses foot-pounds and inch-pounds. For engine block components, you need the exact sequence and angle. The cooling section (Section 10) and fuel/emission section (Section 11) also contain tightening specs for water pump bolts, thermostat housing, and fuel rail. Do not trust a generic chart – use the factory numbers.

Cooling and Fuel Systems: Factory Procedures

Section 10 covers the cooling system. It includes radiator cap pressure, thermostat opening temperature, and water pump inspection points. Section 11 covers fuel and emission, including injector resistance values and vacuum hose routing. Both sections are short but contain the specific data that aftermarket manuals often get wrong. For example, fuel pressure at idle is given in kPa and psi – not a range that covers three different models. If you are upgrading a fuel pump or troubleshooting a cold-start issue, these pages are why you buy OEM.

Source authenticity matters. This is not a third-party compilation. It is a scan of the actual Acura dealer service manual. The page numbers, table formatting, and Japanese supplier notes (like NIHON HATSUJO valve springs) are intact. Compare that to aftermarket manuals that paraphrase specs and introduce rounding errors. I have seen a 5 ft-lb difference in head bolt torque between a factory manual and a popular aftermarket book. That gap can blow a gasket. Stick with OEM. For later models, see Acura Integra 1998 Service Manual or Acura Integra 1998 Service Manual – Section: Electrical (Including Srs). If you need the 1994 specs, grab 1994 Acura Integra Service Manual – Section: Specifications. And for broader context on why factory documentation is the gold standard, check Automotive Industry Overview and Automotive Industry Overview.

The manual is only 18 pages, but it is dense. If you are a beginner, do not skip the safety warnings inside – things like cooling system pressure release and fuel system depressurization are covered. For pros, this is a quick reference you keep on the bench. Access the Factory Manual.

What engines are covered?

B17A1 and B18A1.

Does this manual include torque specs?

Torque values are embedded in the standards and service limits tables, including cylinder head, main bearing, and connecting rod specs.

Is this a full service manual or just a section?

This is a section of the factory service manual, specifically the engine block, cylinder head/valve train, lubrication, cooling, and fuel/emission sections. It does not cover transmission, electrical, or body. However, these 18 pages contain the critical specs for engine rebuild work. Many techs buy this section alone because it has the numbers they need most. If you need the full manual, look for the complete set.

Can I use this for a 1994 Integra?

No. This manual covers 1989-1993 only. For 1994+ models, use the 1994 service manual (see related products above).

Stop hunting through forums for verified data. This manual is the same one that Acura dealers used in the 90s. Every measurement is factory-sourced and typed in the original typeface. Access the Factory Manual and put it on your tablet or print it for the workbench. You will use it every time the head comes off.