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1988 B20a5 with B21 head valve adjustment

 
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Old 04-23-2012, 02:52 AM
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1988 B20a5 with B21 head valve adjustment

Does anyone know what the specifications are for adjusting the valves on a B21 head? I searched through the threads but didn't see a related thread.

I found these specs., but I'd like to make sure they are the right ones before I start messing with things.

Intake 0.08-0.12 mm (0.003-0.006 in)
Exhaust 0.16-0.20 mm (0.006-0.008 in)

(What are the valve adjustment specs for a Honda b21a1 motor)

Thanks in advance.
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Old 04-23-2012, 04:43 PM
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Re: 1988 B20a5 with B21 head valve adjustment

The specs you have are right for metric but the conversion is wrong for the intake valves if you are using standard feeler gauges. It should be:
Intake: 0.10mm +/- 0.02mm or .004" +/- .001"
Exhaust: 0.18mm +/- 0.02mm or .007" +/- .001"

When I adjust the valve lash I always use the go/no go method. I adjust it to where a .004" feeler gauge fits but a .005" one doesn't (intake). And a .007" fits but a .008 doesn't (exhaust).
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Old 04-24-2012, 01:21 AM
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Re: 1988 B20a5 with B21 head valve adjustment

Thank you, that helps a lot.
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