b series valve adjustment

7/26/2019 B Series Valve Adjustment

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B18A1 Valve AdjustmentA valve adjustment req uires an accuracy of .001 in ch! The hea d ha s to be torqued to the block. The

engine has to be cold from sitting overnight. And you have to tighten the jam nuts with t he special tool

first, then finish them off with a torque wrench. All of these factors affect the valve clearance.

Special Tools

The B18A requires a 12mm jam nut adjustment tool (look up the specs for your particular engine). The

specs call for a feeler gauge tool that has the following: .003, .004, .006, .007. Neither of the tools I used

in my D series write-up work for this engine. You can find the jam nut tool and "OEM 25025" on Amazon

for super cheap.

I would have preferred the feeler gauges that have the bend in the end like I used in my D-series write-

up, but I couldn"t find them in the super small size that this engine requires.

The first thing you want to do with your feeler gauges is take the nut off and put the four gauges you'll be

using right on top.

Other Tools

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Every tool I used I threw into a pile and took a pic after I was done. I used a wire brush on the spark plug

threads, a hammer to tap the valve cover loose. Pliers for the hose clamp. 19mm for the crank pulley

bolt. The panel popper tool was useful for getting the valve cover washers and breather hose off. I

needed a drop light to see the timing mark and the cam sprocket marks. The drill with socket adapters is

unnecessary but I get impatient turning the ratchet. The rest is self-explanatory, but I will list them out.

Ratchet

10, 12, 19mm, Spark Plug socket

Long and short Extensions

Mallet

Light

Flat head Screwdriver

Torque Wrench

One or two Torque Wrenches that can do 18 and 80 ft/lbs.

You'll also need liquid gasket (recommend Honda bond), spark plug boot grease, and anti-seize.

Incidentals

You might need a new valve cover gasket, spark plug tube seals, and valve cover grommets/washers.

Remove Wheel

Loosen the lugs on the driver's front wheel. Jack up the front of the car, put a jack stand under the

driver's front jack point. Let the car down.

Plug Wires and Spark Plugs

Take the spark plug wires out of their holders and pull the spark plug boots out. Then remove the spark

plugs. Check their condition, clean the threads, re-gap them, put a little bit of anti-seize on the threads

for later.

Valve Cover


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Remove all of the 10mm nuts holding the valve cover on. Also the nuts holding down the ground wire

and the power steering hose. Put them in a box so you don't lose them.

TDC the Engine


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Put the 19mm on an extension and put it through this access hole onto the crank pulley bolt.


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Start by finding top dead center for cylinder 1 (closest to crank pulley). Rotate the engine

counterclockwise until the "up" arrows on the cam sprockets are facing up. Then shine a light down to

the crank pulley from above until you see the pointer on the timing belt cover pointing at the white mark

on the pulley. It doesn't have to be perfect.

Check Valve Clearance

.003 gauge slides in...


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.004 doesn't.

Check the valve clearance for cylinder 1. The spec for the B18A is .003 inches on the intake, .006 on

the exhaust. On my engine that has probably never had a valve adjustment, the all the intake valves

were too loose and the exhaust valves were too tight. So this will make a huge difference!

Adjust the Valves

This is the method that was taught to me by a coworker who's been working on Hondas since long

before I was born. It's simple: you want the clearance as loose as it can be as long as the next larger

feeler gauge will not fit. So on the intake valves the .003 gauge should slide in, but the .004 shouldn"t.

On the exhaust the .006 should slide in, but the .007 shouldn"t. Piece of cake.

Put the feeler gauge in the gap below the cam lobe, tighten the screw with the special tool, pull the

feeler gauge out and then try the next larger gauge. If it wont slide in, hold the screw and tighten the jam

nut. Then torque the jam nut to 18 ft/lbs and measure the clearance again. Torquing it will increase the

clearance slightly, so keep this in mind when you're adjusting them so you don't have to keep repeating

the process.

Rotate the Engine


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Rotate the engine counterclockwise so that the "UP" marks are now facing the front bumper (cam

sprockets turn 90 degrees). Adjust the valves on cylinder 3. Rotate the engine so the "UP" marks are

down. Adjust the valves on cylinder 4. Rotate the engine so the "UP" marks face the windshield. Adjust

the valves on cylinder 2.

You'll know if you're checking the wrong cylinder if the cam lobes are facing down.

Triple Check Your Measurements

Rotate the engine and check each cylinder one last time.

Put it Back Together

Most of the re-installation process is the opposite of removal. The exception is that you need to clean

the valve cover mating surface of any oil, crud, and old liquid gasket. Apply new liquid gasket to each of

the 90 degrees bends in the valve cover gasket. You have about 15 minutes to torque the valve cover

down before the liquid gasket dries. Then you have to wait an hour or two for it to fully cure before you

can start the engine.

Reset the ECU

The 1992 Integra is OBD1 so you reset the ECU by pulling the 7.5A fuse in the fuse box under the hood

(same as the EG Civic).

Hand tighten the lug nuts as much as you can with the wheel off the ground, drop the car, then torque

them to 80 ft/lbs.

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b series valve adjustment

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