Amber like material in exhaust
 

Ok, this one is baffling. I just pulled both my 525EFI's for some winter work and both, including the one rebuilt last spring have a bit of amber like material in the exhaust ports of the heads. I searched around online and found a few other people with the same thing, but no answers on what it is. Maybe something from the fuel? Anyone have any ideas???

That could be residue from evaporating water . Did you pressure check your headers ?

They are Hardin, and I check them every winter. Plus, it is in almost every cylinder (varying amounts) on both engines. Only thing that makes sense is something in the fuel.

I see said the blind man . Anything laying in the exhaust ports should have passed through the combustion process and hence be exhaust smoke or carbon . My conclusion is the same but i'm just a nobody trying to help you . What do your spark plugs look like ? They usually have a story to tell .

if you can post a pic it would do a lot better then us guessing what it is...

Is it the pink/amber dye from the antifreeze?

The texture is also what throws me. It is soft, like amber, not hard and crumbly like salt.

looks like condensation,,where you located?

i also see white stuff around the end of the valve seat,and looks like a lot of rust on the freeze plug,strange since they are brass when they leave mercury.

I think that's a head bolt washer you are seeing.
Eddie

I agree

yes,its to high to be a freeze plug.

Yes, that's a head bolt.

could a small amount of reversion,be causing this???

Possible, but it is on all 4 sides. And wouldn't it be salt then? I'm still thinking some sort of fuel additive.

Do a bleed down test, my bet is reversion and leaky valves. I have seen this on several 525's with high bleed down numbers, some over 50% with less than 150 hours on them.

I finished breaking down the engine. There was some salt residue on the exhaust runners. Maybe it is reversion an just something in the water.

PSI check your headers if you haven't done so to rule that out.

Have not done yet, but I am now in the tiresome habit of pulling and testing them every winter, even with the new Hardins. So far they have been good, just one pin hole.