Melted piston?

AW_3_3 · 06-30-2009, 04:41 PM

I have a Assy in 2008 Briggs and Stratton 675 series lawnmower. I did my once a year maintenance (I bought it in may of 2008) last week, and when I took the cylinder head off, this is what I saw. It looks melted, in all the areas except where the cylinder head directs the flame onto the piston. Is this melted, or carbon? I couldnt get it off, even with a drill and wire-brush attatchment. The same thing was on the cylinder head, only not so much. It was black-brown, and looked like it was peeling in places, but that came off with the wire brush. What do you think? Melted? The muffler is discolored around the mounting bolts and exhaust holes from the heat. More so in one year than I have ever seen.

http://i266.photobucket.com/albums/i...r/DSC03482.jpg

**Basementgeek** · 06-30-2009, 09:44 PM

Taking the head off is not considered "normal" maintenance item. I have 20+year old mower that has never had the heads off.

I would say that it may be deposits from the fuel is all.

On the exhaust probably because newer engines are set to run on the lean side and run a little hotter than they used to.

Don't forget the new head gasket

BG

06-30-2009, 04:41 PM	#1 (permalink)
AW_3_3 Registered User Join Date: Dec 2007 Location: Upstate NY Posts: 10 OS: Windows 7 RC x64	Melted piston? I have a Assy in 2008 Briggs and Stratton 675 series lawnmower. I did my once a year maintenance (I bought it in may of 2008) last week, and when I took the cylinder head off, this is what I saw. It looks melted, in all the areas except where the cylinder head directs the flame onto the piston. Is this melted, or carbon? I couldnt get it off, even with a drill and wire-brush attatchment. The same thing was on the cylinder head, only not so much. It was black-brown, and looked like it was peeling in places, but that came off with the wire brush. What do you think? Melted? The muffler is discolored around the mounting bolts and exhaust holes from the heat. More so in one year than I have ever seen. http://i266.photobucket.com/albums/i...r/DSC03482.jpg __________________ SKIING= MY ANTI-DRUG --VISITING TECH SUPPORT STAFF FROM PCHF--

06-30-2009, 09:44 PM	#2 (permalink)
Basementgeek Moderator, Home Support Join Date: Feb 2005 Location: Central Ohio, USA Posts: 1,355 OS: XP Pro SP2/Vista Ultimate SP2 Blog Entries: 3	Re: Melted piston? Taking the head off is not considered "normal" maintenance item. I have 20+year old mower that has never had the heads off. I would say that it may be deposits from the fuel is all. On the exhaust probably because newer engines are set to run on the lean side and run a little hotter than they used to. Don't forget the new head gasket BG __________________ Donating to the forum keeps TSF free for all. Proud member of ASAP