glowing exhaust on stump grinder

[malc]

when I was putting our Vermeer 252 away today I noticed that half of the exhaust was glowing bright red.

any ideas? I was thinking along the lines of a broken exhaust valve on one side am I on the right track

 

 

thanks

[Stubby]

Running lean perhaps ?

[treefolk]

What colour are the spark plug ends?

[spudulike]

Possible the baffle has collapsed and is partially blocking the exhaust gasses leaving the first part of the exhaust thus retaining too much heat.

 

If a valve had failed, the engine would be pretty sluggish and wouldn't raise the temperature.

[malc]

thanks for advice, I will look into it in more depth tomorrow

[Billy]

Had several machines with this engine all have done this fairly regularly if you see them working hard in low light

[marne]

Mine does it too, but not only on one side. It has to be quite dark to see this and the machine should have had a hard run before. Never turned it off that hot.

Would definitely check the plugs just to be sure.

[malc]

its never done it before and we have used it when its almost dark.

It hadn't been used had when it started to glow, I had only had it running for 2 mins when driving it into the shed.

I took the spark plugs out today and the one on the glowing side is the grey one and the black one is from the good side

 

any more ideas, as I haven't taken the exhaust off yet

 

[cornish wood burner]

As Stubby says probably running lean on that cylinder. Inlet rather than exhaust I would think.

Check inlet manifold gasket and bolts

[spudulike]

A well running engine will make the plug go a tan colour, black means too rich or oil and grey means overheating and white means very lean and seizure is imminent