Hello all, I need some help from people more knowledgeable than myself about small engines.
Over the weekend I was plowing some dirt with my '72 LGT 100 and noticed I was losing oil; about 4 oz a day. I usually lose that much between oil changes, not between uses, but the tractor was running fine and I noticed no loss of power or performance.
I looked everything over and noticed oil on the top 2 cooling fins on the front of the engine. I also noticed the crankcase breather was covered in muck, which I cleaned.
Thinking I have head gasket issues, I began disassembly. Before removing the head, I noted that only 2 or 3 of the cylinder head bolts were still tight enough. Most need another 5-7 ft lbs of torque. I didn't have time to pull the head off.
I also pulled the spark plug and it was dry, sooty black. I had just checked the plug a couple weeks ago and it was grey, so something happened recently.
What could have caused the bolts to loosen? Time/age? Carbon buildup & warpage?
I "think" the head bolts have been loose for some time and that the clogged breather pushed the oil through this convenient place. I also think this looseness plus the pressure from the clogged breather caused low compression, which caused the carbon in the last couple weeks. I always run Chevron Techron in my gas and check the spark plug during the season. Carbon buildup has never been a concern.
I have no reason to suspect that I overheated. No pinging, knocking, smoking, etc. I'm tempted to just tighten the cylinder head in sequence and see if the oil leak goes away, but I don't know if that's prudent. I take good care of this thing and don't want to shotgun a repair; if the head should come off, it will come off.
Edited by kiddpitt, October 22, 2013 - 07:23 AM.