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NHTSA ID Number: 10150935
Manufacturer Communication Number: 02-179-18
Summary
This Service Information Bulletin announces a change to the procedure and sequence used for torqueing the cylinder head bolts on the EJ25 turbocharged engine used in the 2015-2018MY STI.
NUMBER: 02-179-18
DATE: 10/12/18
APPLICABILITY | 2015-2018MY STI |
SUBJECT: | Cylinder Head Bolt Torqueing Sequence- UPDATED |
INTRODUCTION:
This Service Information Bulletin announces a change to the procedure and sequence used for torqueing the cylinder head bolts on the EJ25 turbocharged engine used in the 2015-2018MY STI.
SERVICE PROCEDURE / INFORMATION:
REMINDER: Customer satisfaction and retention starts with performing quality repairs.
The procedures for torqueing the cylinder head bolts have changed as outlined below. Always refer to the applicable Service Manual and review the full requirements of the repair being performed. The Service Manual procedures contain information critical to performing an effective repair the first time and every time. This includes but is not limited to: important SAFETY precautions, proper inspection criteria, necessary special tools, required processes and related one-time-use parts needed for a complete and lasting repair.
Step 1: Preparation:
IMPORTANT NOTE: To achieve accurate cylinder head bolt torque, a quality torque wrench and a torque angle gauge are both required. If the torque wrench or angle gauge has not been calibrated at least once in the prior 6 months, a calibration check should be completed. The RH and LH sequences are provided in the images below. In addition:
- Always clean the cylinder head bolt threads and the bolt holes in the cylinder block before proceeding with cylinder head installation.
- While wearing eye protection, blow out all the bolt holes in the block using compressed air.
- Always coat the head bolt threads and the head bolt washers thoroughly with engine oil.
- Always use a NEW cylinder head gasket.
Step 2: Install the cylinder head onto the block while being careful to not scratch any of the machined mating surfaces.
Step 3: Tighten all bolts to 40 Nm (29.5 ft. lbs.) in alphabetical order (as shown in the drawing below see letters A to F).
Step 4: Re-tighten all bolts to 69 Nm (50.9 ft. lbs.) in alphabetical order.
**VERY IMPORTANT: If the bolts make a stick-slip sound (Click, Creak or Squeak) or don’t feel like they are tightening smoothly, repeat a), b) and c) as outlined in Step 1. (In this case, the cylinder head gasket can be reused.)
Step 5: Loosen all bolts by 180° in reverse order of tightening (F to A) then loosen further by another 180° (F to A).
Step 6: Tighten all bolts to 40 Nm (29.5 ft. lbs.) in alphabetical order.
Step 7: Retighten all bolts to 69 Nm (50.9 ft. lbs.) in alphabetical order.
Step 8: Loosen bolts E, D, and A by 360° in this specific order.
Step 9: Tighten bolts A, D, and E to 10 Nm (7.4 ft. lbs.) in this specific order.
Step 10: Tighten bolts A, D, and E to 30 Nm (22.1 ft. lbs.) in this specific order.
Step 11: Further tighten bolts A, D, and E by 98 – 102° in this specific order.
Step 12: Further tighten bolt A by 123 – 127°.
Step 13: Further tighten bolts D and E by 78 – 82° in this specific order.
Step 14: Loosen bolts F, C, and B by 360° in this specific order.
Step 15: Tighten bolts B, C, and F to 10 Nm (7.4 ft. lbs.) in this specific order.
Step 16: Tighten bolts B, C, and F to 30 Nm (22.1 ft. lbs.) in this specific order.
Step 17: Further tighten bolts B, C, and F by 98 – 102° in this specific order.
Step 18: Further tighten bolt B by 123 – 127°.
Step 19: Further tighten bolts C and F by 78 – 82° in this specific order to complete the procedure.
5 Affected Products
Vehicle
MAKE | MODEL | YEAR |
SUBARU | WRX STI | 2015-2019 |
1 Associated Document
Manufacturer Communications
NUMBER: 02-179-18
DATE: 10/12/18
https://www.nhtsa.gov/recalls?nhtsaId=10150935
NHTSA ID Number: 10150910
Manufacturer Communication Number: 02-179-18
Summary
This Service Information Bulletin announces a change to the procedure and sequence used for torqueing the cylinder head bolts on the EJ25 turbocharged engine used in the 2015-2018MY STI.
1 Associated Document
Manufacturer Communications
NUMBER: 02-179-18
DATE: 10/12/18
https://www.nhtsa.gov/recalls?nhtsaId=10150910
“This site contains affiliate links for which OEMDTC may be compensated” |
- Garage-Pro JCWREPS320205GP Features: Set of 12, This product will fit vehicles with SOHC engine. Will NOT fit DOHC engine.
- Interchange Part Number: HBK715, ES72212
- Fitnotes: Engine Designation: EJ253, Naturally Aspirated, SOHC, 16 Valves
- A high quality, Direct Fit OE Replacement Cylinder Head Bolt , with FREE 1-year UNLIMITED mileage warranty coverage on Garage-Pro items.
- THIS IS BRAND NEW: DNJ® Head Bolt Kit
- FITS: 99-12 Subaru, Saab / Legacy, Outback, Impreza, Forester, 9-2X, Baja 2.5L H4 SOHC Naturally Aspirated EJ253,EJ251
- FITMENT NOTES: One Set Services Complete Engine
- DNJ Engine Components is a full line provider of Domestic & Japanese engine parts for cars and trucks.
- We carefully selected DNJ Engine Components as the sole provider. DNJ has a 30+ year track record of quality, experience, and trust. It makes sense for us to carry a brand that would help us earn customer loyalty in the long run
- [Fits Vehicles]For Subaru Forester 1998 For Subaru Impreza 1998 For Subaru Legacy 1996-1999
- [OE Number]ES72905, HS26167PT-3, HS26167PT-2, HS26167PT-1, HS26167PT, HBSB008, HSSB008
- [Kit Parts Included]Graphite head gasket+Intake manifold gasket+Exhaust manifold gasket+Valve cover gasket+Viton valve stem seals+Camshaft front+O-rings+Other Small Gaskets+12 Head Bolts
- [Quality]Unless noted otherwise, these are new aftermarket parts. They are manufactured to align with Original Equipment (OE) specifications and act as a direct replacement for the factory part, not as an upgrade or improvement. They will fit and function as the original factory part did.
- [Warranty]We provide a one-year warranty. We try to provide quality products and service to our customers. Any problem please feel free to contact us and you will get a satisfactory solution.
- Garage-Pro JCWREPS320201GP Features: Set of 12, This product will fit vehicles with DOHC engine. Will NOT fit SOHC engine.
- Interchange Part Number: HBK710, ES72905
- A high quality, Direct Fit OE Replacement Cylinder Head Bolt , with FREE 1-year UNLIMITED mileage warranty coverage on Garage-Pro items.
- 🚘【Replace OE Numbers】HGS715, HS26170PT1, HBK715, ES72212. Head Gasket Set Compatible with 2005 9-2X Linear Engine Designation: EJ253, 2003-2006 Baja Sport ,2006-2011 Impreza 2.5i,2006-2008 Forester X L.L. Bean. Please check the description and compatibility chart before your purchasing.
- 🚘【Application】Head gasket kit with Bolts Compatible with 2008 Legacy Touring,2001-2004 Legacy (submodel: GT, L),2009 Outback 2.5i Special,2010-2011 Impreza 2.5i Premium,2006-2008 Forester X L.L. Bean for Engine EJ253 EJ25 EJ251
- 🚘【High-Quality】Premium Sealing Solution, Valve Grind Set, w/o Upper Int. Set. We Engine Components has built a reputation for producing high-quality aftermarket engine components.
- 🚘【NOTE】The attachment to the valve cover gasket must be just right-not too tight and not too loose. And please check year/make/model of your vehicle with the part finder tool on the top left corner to confirm compatibility before purchase.
- 🚘【Warranty】12-Months-Warranty from the date of purchase.Carefully read the list and make sure the part is compatible. If you are not sure, please contact us.
- Garage-Pro JCWRS32020001GP Features: Set of 8
- Interchange Part Number: ES72464, HBK717
- A high quality, Direct Fit OE Replacement Cylinder Head Bolt , with FREE 1-year UNLIMITED mileage warranty coverage on Garage-Pro items.
- 【Vehicle Fitment】Fits for Subaru Legacy 2000-2003, Fits For Subaru Outback 2000-2003, Fits For Subaru Impreza 1999-2003, Fits For Subaru Forester 1999-2003, Fits For Subaru Baja 2003, 2.5L 2458CC H4 SOHC, Engine: EJ251, EJ252, EJ253.
- 【Replaces Part Number】Full Head Gasket Set with Bolts direct replacement for part# HS26170PT-1 ES72212.
- 【Good sealing】The cylinder engine gasket kit can effectively seal the coolant ,oil and air in the cylinder, to eliminate leak paths.
- 【Highly Durable】Full Multi layer steel (MLS) head gasket. It is very durable, not easy to damage, stable operation at higher or lower temperatures.
- 【Attention】 the accurate way to judge the compatibility is your old gaskets part number, so please confirm the old part number match our list part number( do not judge it by your vehicle model and year!!) Professional installation in highly recommended (No instruction included).
- FEATURE: Material: 35CrMo / Quenching: Grade 12.9 / Tensile strength: 1200Mpa about 174000PSI / Replace Part Number: 260-4701
- Fits All for Subaru IMPREZA WRX & STI TURBO EJ20 2.0L and EJ25 2.5L DOHC Turbo Engines.
- Each stud is centerless ground to make it as close to perfectly concentric as possible.
- This procedure involves about ten very slight cuts and results in an exceptionally straight part.
- Kit comes with all: 11mm head studs*12psc washers*12psc nuts*12psc
Last update on 2024-04-03 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.
SEOCONTENT-START
Bulletin Number: 02-179-18; Date: 10/12/18 Page 1 of 3 NUMBER: 02-179-18 DATE: 10/12/18 APPLICABILITY: 2015-2018MY STI SUBJECT: Cylinder Head Bolt Torqueing Sequence- UPDATED CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS. Subaru Service Bulletins are intended for use by professional technicians ONLY. They are written to inform those technicians of conditions that may occur in some vehicles, or to provide information that could assist in the proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do the job correctly and safely. If a condition is described, DO NOT assume that this Service Bulletin applies to your vehicle, or that your vehicle will have that condition. Subaru of America, Inc. is ISO 14001 Compliant ISO 14001 is the international standard for excellence in Environmental Management Systems. Please recycle or dispose of automotive products in a manner that is friendly to our environment and in accordance with all local, state and federal laws and regulations. Continued… INTRODUCTION: This Service Information Bulletin announces a change to the procedure and sequence used for torqueing the cylinder head bolts on the EJ25 turbocharged engine used in the 2015-2018MY STI. SERVICE PROCEDURE / INFORMATION: REMINDER: Customer satisfaction and retention starts with performing quality repairs. The procedures for torqueing the cylinder head bolts have changed as outlined below. Always refer to the applicable Service Manual and review the full requirements of the repair being performed. The Service Manual procedures contain information critical to performing an effective repair the first time and every time. This includes but is not limited to: important SAFETY precautions, proper inspection criteria, necessary special tools, required processes and related one-time-use parts needed for a complete and lasting repair. Step 1: Preparation: IMPORTANT NOTE: To achieve accurate cylinder head bolt torque, a quality torque wrench and a torque angle gauge are both required. If the torque wrench or angle gauge has not been calibrated at least once in the prior 6 months, a calibration check should be completed. The RH and LH sequences are provided in the images below. In addition: a) Always clean the cylinder head bolt threads and the bolt holes in the cylinder block before proceeding with cylinder head installation. b) While wearing eye protection, blow out all the bolt holes in the block using compressed air. c) Always coat the head bolt threads and the head bolt washers thoroughly with engine oil. d) Always use a NEW cylinder head gasket. SERVICE INFORMATION BULLETIN ATTENTION: GENERAL MANAGER q PARTS MANAGER q CLAIMS PERSONNEL q SERVICE MANAGER q IMPORTANT – All Service Personnel Should Read and Initial in the boxes provided, right. © 2018 Subaru of America, Inc. All rights reserved. Bulletin Number: 02-179-18; Date: 10/12/18 Page 2 of 3 Continued… Step 2: Install the cylinder head onto the block while being careful to not scratch any of the machined mating surfaces. Step 3: Tighten all bolts to 40 Nm (29.5 ft. lbs.) in alphabetical order (as shown in the drawing below see letters A to F). Step 4: Re-tighten all bolts to 69 Nm (50.9 ft. lbs.) in alphabetical order. **VERY IMPORTANT: If the bolts make a stick-slip sound (Click, Creak or Squeak) or don’t feel like they are tightening smoothly, repeat a), b) and c) as outlined in Step 1. (In this case, the cylinder head gasket can be reused.) Step 5: Loosen all bolts by 180° in reverse order of tightening (F to A) then loosen further by another 180° (F to A). Step 6: Tighten all bolts to 40 Nm (29.5 ft. lbs.) in alphabetical order. Step 7: Retighten all bolts to 69 Nm (50.9 ft. lbs.) in alphabetical order. Step 8: Loosen bolts E, D, and A by 360° in this specific order. Step 9: Tighten bolts A, D, and E to 10 Nm (7.4 ft. lbs.) in this specific order. Step 10: Tighten bolts A, D, and E to 30 Nm (22.1 ft. lbs.) in this specific order. Step 11: Further tighten bolts A, D, and E by 98 – 102° in this specific order. Step 12: Further tighten bolt A by 123 – 127°. Step 13: Further tighten bolts D and E by 78 – 82° in this specific order. Step 14: Loosen bolts F, C, and B by 360° in this specific order. Step 15: Tighten bolts B, C, and F to 10 Nm (7.4 ft. lbs.) in this specific order. Step 16: Tighten bolts B, C, and F to 30 Nm (22.1 ft. lbs.) in this specific order. Step 17: Further tighten bolts B, C, and F by 98 – 102° in this specific order. Step 18: Further tighten bolt B by 123 – 127°. Step 19: Further tighten bolts C and F by 78 – 82° in this specific order to complete the procedure. Bulletin Number: 02-179-18; Date: 10/12/18 Page 3 of 3 IMPORTANT REMINDERS: • SOA strongly discourages the printing and/or local storage of service information as previously released information and electronic publications may be updated at any time. • Always check for any open recalls or campaigns anytime a vehicle is in for servicing. • Always refer to STIS for the latest service information before performing any repairs.
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