How does valve clearance tighten?

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rebar

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I have had the dealer check my valve clearance but I forget how many miles ago since it was in 87. I dont have over 25K on her though.

Im thinking about doing it again because I dont trust anyone, but wondering if its worth it.

How does the clearance get smaller?:ummm:
 
I believe it's due to the heat/cooling cycles.

I just know that exhaust tighten over time and the intakes rarely do.
 
maleko89 said:
I believe it's due to the heat/cooling cycles.

I just know that exhaust tighten over time and the intakes rarely do.
Click to expand...

Thanks Mark. So what kind of conditions does a tight exhaust valve create?

Shouldn't wear the cam lobe excessively..:confused2: But might keep the exhaust valve open when hot?:ummm:

I was listening for cam/valve noise but couldn't hear anything over the norm.

What have you guys found?? Intakes good to go, but exhaust needs smaller shims?:confused2:

Has anyone had issues NOT adjusting clearance?
 
That's what I was thinking. When I checked mine at 53,000 miles all my exhaust valves were .006 inches which is pretty tight. The cam lobes looked perfect. I don't think I was losing compression due to a valve hanging open because compression values didn't change from what I recall.

Once I set them all to .0115 inches it seemed to run much better. It's almost like a sync of the carbs but instead you are syncing the engine.
 
The lobes don't typically wear down. The seats and valves wear and recess slowly and that lets the valve move closer to the camshaft thus decreasing the clearance.

Sean
 
Less clearance is more lift but also can hold the valves open too long resulting in lost hp from the intake reversion.

Sean
 
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