27W-6-271 Coolant Tank - 11th Gen Type-R and Type-S

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These instructions were written using a 2018 Honda Civic Si and a 2023 Civic Type R

2.0L NA fitment has not been confirmed

These instructions are for 11th Gen Type R and Type S. 10th Generation Civic instructions are here: 27W-6-271 Coolant Tank - 10th Gen Civic

The 27WON coolant tank does not include a sight glass by design. These discolor and can be prone to leaking. Coolant level must be checked using the dip stick periodically

Open the hood to access the OEM coolant tank

Use a 3/8" ratchet and 10mm socket to remove the 10mm bolt securing the A/C hardline

Rotate the bracket up and out of the way to give you some room to work

Use a 14mm socket and ratchet to remove the (3) 14mm bolts securing the side engine mount auxiliary bracket

Remove bracket from the vehicle and set aside for reinstallation later

Use 10mm socket, ratchet, and extension to remove (2) 10mm bolts securing the coolant tank to its chassis brackets

2018 Civic Si Shown. FL5/DE5 Similar

Move coolant tank up and out of the chassis brackets as shown

Hoses will still be attached at this point

Use a 3/8" ratchet and 10mm socket to remove (2) 10mm bolts securing the upper chassis tank bracket

You will not reinstall this bracket

If you have a 27WON or aftermarket FSTB installed we suggest removing it at this time to create more space to get access to the back lower bracket. Use our install guide to remove your 27WON FSTB. This is not required but makes things easier

Use a 3/8" ratchet and 10mm socket to remove (2) 10mm bolts securing the lower chassis tank bracket

3rd image shows bracket off vehicle to identify the location of the bolts

You will not reinstall this bracket later

2018 Civic Si Shown. FL5 and DE5 similar

Use needle nose pliers to squeeze and slide back clamps on both upper and lower coolant hoses

Use two vice grips with blue tape on the jaw ends to pinch off the coolant hoses. Put one on each hose about 3-6" away from the barb

The blue tape helps to make sure the jaw does not cut into the hose

Pinching off the hoses helps keep coolant in the system and minimizes the mess and loss

Using a slight twist and pulling motion at the same time pull the hoses off the coolant tank until each one pops off

Use caution not to break coolant tank. Hose pliers are useful here

Remove coolant tank from car

Keep the barbs as vertical as possible to avoid spilling coolant

Remove the loosened pinch style hose clamps from OE coolant lines

A wiring loom is bolted to the engine that will not fit between the engine and the 27WON coolant tank

Remove bolt securing wiring loom with a 10mm socket and ratchet

Optional: Secure wiring loom out of the way with provided Zip Tie

2018 Civic Si Shown. FL5 and DE5 similar

This step needs to be updated. Upper fitting is similar but smaller. Lower fitting is 90 degree

Special thread sealant is used with the NPT style fittings equipped on the 27WON tank. It may seem 'wet' during install. This is normal

Put the 27WON coolant tank in place and reinstall the coolant hoses over the two barbs and secure with provided clamps or OE clamps where possible

Make sure lower hose does not touch side motor mount bracket when it's installed later

Remove Vice-grips preventing coolant lines from leaking

Two deep breaths. This part can be frustrating

Setup lower mount hardware using spacer, washer, and 25mm long M6 bolt as shown

Spacer bushing threads on to hold the hardware stack in place

Spacer Bushing

Lower Coolant tank into position

Use a small 10mm socket and 2" extension and fingers to start threading the lowest mount bolt

Use a small 10mm socket and 2.75" extension and fingers to start threading the higher lower mount bolt using provided 12mm long bolt and washer

Use your fingers to turn both bolts to finger tight

Using a provided M6 washer and a 12mm long M6 flanged bolt, torque to snug down the upper mount bolt for the coolant tank

The plane of this mount is at an odd angle. Use extra caution not to cross thread. Washer not shown

"torque to snug" is defined as 1/4 to 1/2 more rotation after setting resistance is felt

Torque to snug the top lower mount bolt for the coolant tank

Bolt and Washer not shown

Now torque to snug the lowest mount point for the coolant tank from the previous step

"torque to snug" is defined as 1/4 to 1/2 more rotation after setting resistance is felt

Reinstall the side engine mount bracket with (3) 14mm bolts removed earlier. Torque to snug

Reinstall the A/C line bracket with the 10mm bolt. Torque to snug

Drain whatever coolant remains in OE tank into 27WON tank

Using a slight twist and pulling motion to remove OEM overflow hose by pulling hose to the side

Use caution not to break coolant tank. Hose pliers are useful here

Remove radiator cap from OEM tank by twisting the cap off

Install OEM overflow hose onto 27WON tank by pushing it on barb as shown

Use a Zip-tie to secure the hose to the barb and prevent leaks

Make sure Zip-tie will not interfere with radiator cap

Zip-tie should slightly deform hose if it's tight enough

Clip Zip-tie

Fully install OEM radiator cap on 27WON Coolant Tank

Wipe clean OEM radiator cap and dry

Apply provided sticker to radiator cap in desired orientation

Non-Type R shown. These have 1.1 bar caps

Type R and Type S have a 1.3 bar cap

Add coolant to the appropriate level using the 27WON dipstick as a measuring guide. We suggest the use of Honda OEM coolant for your car

The next step will show how to check coolant level with Dip Stick

Coolant on at least seven (7) threads is full. If there is no coolant on the Dip Stick then it is low

Add Coolant

Full Coolant

Don't fill coolant past threaded portion of dip stick

Remove cap to add coolant

Fully insert dip stick in the cap bung until it stops on bung

Remove dip stick and check coolant level

Add coolant to the appropriate level using the 27WON dipstick as a measuring guide

At least 7 threads is considered full, half of threaded section

Don't fill coolant past threaded portion of dip stick

If you can't find your Dip Stick you can check coolant level without it. Make sure coolant is to a depth of 2" give or take 1/4"

Wipe Dip Stick clean of coolant

With the cap off the tank start up the car and bleed the system by allowing the car to get to an operating temperature of 170 degF before putting the cap back on

170 degF is nearly warmed up

Monitor for leaks from your tank while warming up the car

If any leaks are discovered reach out to our customer service team for install assistance

Replace cap once engine coolant temp (ECT) is above 170 degrees

Your Dip Stick is designed as a key chain. You can store it there or holster it someplace else

Anodized finish may get damaged by keys. This won't impact it's function

Place dip stick where it will not be lost or cause any damage if it comes free

An automotive clip with 3M VHB adhesive is included

Wipe clean and dry area to stick

Press down gently to open the slit

Peel off tape liner and stick on a clean and flat surface then press clip firmly for 30 seconds

Wait 15 minutes before inserting Dip Stick for best result

The 27WON coolant tank does not include a sight glass by design. These discolor and can be prone to leaking. Coolant level must be checked using the dip stick periodically. 27WON recommends checking coolant level during oil changes

When possible, make sure car is cool before checking coolant level. Follow owners manual for removal of cap

Contents can be under pressure and extremely hot

Use provided keychain Dip Stick to check coolant levels as shown in step 20

No coolant on threads means coolant is low

Coolant on at least 7 threads is full

Don't fill coolant past threaded portion of dip stick

If you can't find your Dip Stick you can check coolant level without it. Make sure coolant is to a depth of 2" give or take 1/4"

This completes the installation of your 27WON Performance Coolant Tank

We hope you were impressed with your 27WON experience and love your new Coolant Tank for years to come. Email us at sales@27won.com or call us at 571-271-0271 with any questions or concerns

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