Changes in Valve Clearance
Posted: Thu Jun 08, 2017 4:05 pm
I am hoping that one of you experienced Elan owners may be able to shed some light on a problem I have discovered with my valve clearances.
My engine was rebuilt 2000 miles ago by a reputable engine shop. Valve clearances were set to spec.
Two weeks ago the car overheated (stuck thermostat). I was able to shut down quickly and a subsequent inspection showed none of the problems normally associated with a head gasket failure. I noticed however, that the engine seemed to be making more tappet noise than before so I checked valve clearances
The exhaust valve clearances were 12 to 21 thou. The intake valve clearances were all less the 1.5 thou.
I don't know for sure that overheating is at the root of the issue. The engine may have been getting gradually noisier before the overheating. In any case, I would like to understand what caused the changes before I take the time to re-shim all of the valves.
Does anyone have any thoughts or similar experiences?
Gary
My engine was rebuilt 2000 miles ago by a reputable engine shop. Valve clearances were set to spec.
Two weeks ago the car overheated (stuck thermostat). I was able to shut down quickly and a subsequent inspection showed none of the problems normally associated with a head gasket failure. I noticed however, that the engine seemed to be making more tappet noise than before so I checked valve clearances
The exhaust valve clearances were 12 to 21 thou. The intake valve clearances were all less the 1.5 thou.
I don't know for sure that overheating is at the root of the issue. The engine may have been getting gradually noisier before the overheating. In any case, I would like to understand what caused the changes before I take the time to re-shim all of the valves.
Does anyone have any thoughts or similar experiences?
Gary