I've got loud valve noise, and have set about adjusting them, but have run into a slight problem.

This is a N42 head, and the intake is supposed to be .025 and exhaust .030 when set hot, .020 and .025 when cold. I'm setting hot.

Was able to set cylinder 1 ok, but moving to cylinder 5, I can't get adequate clearance even with the adjuster as low as it can go.

Do I wait for the engine to cool and then try or what?

Thanks in advance for the help!

The adjustment should be able to be made when hot/warm. If not, you need to replace some parts.

Frank

Thanks.

Where do I start - valve springs?

Best regards,

PSB

I believe you may have mis-read the specs or found a bad reference.

The specs from the 76 Factory Service Manual are:

Hot

Intake 0.25 mm or 0.0098 inches (0.010")

Exh 0.30 mm or 0.0118 inches (0.012")

Cold

Intake 0.20 mm or 0.0079 inches (0.008")

Exh 0.25 mm or 0.0098 inches (0.010")

Check your clearances again with these new settings!!

Jim

I've got loud valve noise, and have set about adjusting them, but have run into a slight problem.

This is a N42 head, and the intake is supposed to be .025 and exhaust .030 when set hot, .020 and .025 when cold. I'm setting hot.

Was able to set cylinder 1 ok, but moving to cylinder 5, I can't get adequate clearance even with the adjuster as low as it can go.

Do I wait for the engine to cool and then try or what?

Thanks in advance for the help!

Where did you get those numbers ? Something is way wrong here. .008'' and .010'' is all I have ever seen. Gary z137 nailed it.

Duh...

mm vs inches. Re-read the service manual.

Too many late nights in the garage with cleaning solvents...

Thanks, once again.

loud valve noise?

check under the rocker arms for the insert/disk that sits on top of the valve stem, maybe..

The insert may have turned 90 degrees and put the valve out of adjusment.

What were you doing when the noise started?

Thanks for the replies...

Valves are adjusted to spec, and I found the real source of the noise: the tensioner is loose, so the slack-side of the chain was flopping. I need to buy a long, ratcheting 10mm wrench tomorrow to reach the bolt, but we're nearly there!

Best regards,

PSB