I have a 72 GS 455 in my Regal. Before I changed my oil last weekend, I used the GUNK 5 minute engine flush product. Now I blow smoke out of the exhaust every time I take off from a stand still. It never smoked at all before. Has anyone else experienced this? Is it just the engine flush and all the junk it loosened up burning off? If I take the oil fill cap off and rev the engine, it blows smoke out of there too. MARK
Sounds like it may have loosened up the crud that was keeping the oil from leaking past the valve stem seals.
smoke coming out of the oil fill or breather cap is usually associated with blowby. in other words compression getting past the rings. Bob
Sounds like blowby to me............perhaps your piston rings became stuck to your pistons and are not expanding? :bglasses:
My theory is that the flush solvent melted the carbon and gunk around the piston grooves and dried like glue causing the rings to be stuck to the pistons. I don't know about 455's but it happenned to the engine in my old Dodge Caravan v6 motor. The rings weren't even worn, they were just stuck to the pistons.........when I took them out of the cylinder they stayed compressed and were very difficult to remove from the piston. I didn't flush it though, it was just from age. :bglasses:
I had a similar experience thousands and thousands of years ago. 283 Chevy, lifter valley filled level to the tops of the lifter bosses with sludge. Used oil-additive detergent to "clean out" the sludge. Yeah, it cleaned it out of the lifter valley, and into the ring grooves. Car looked like a mosquito fogger, you couldn't see through the smoke.
One other thing it could be.........the oil return passages in the cylinder heads could be plugged with sludge, causing the valve covers to flood with oil. You may want to pull them off and check this out. You can clean them out with a piece of wire and compressed air. :bglasses:
Engine restore I know a guy that put engine restore in a perfectly good running motor and with in five miles it smoked like crazy. He drained the stuff out and put regular motor oil back in it. But it still smoked bad and he had to get it rebuilt. :ball: He showed me this stuff and it had small copper shavings and gritt in it ? He said that stuff is suppose to help seal the rings.:laugh: And i said what about your bearings and everything else.:jd:
Long time ago when I was in high school, (before the invention of the wheel:grin: ) a friend of mine had a chivvy 283 that smoked. So this guy told him to pour cleanser down the carb with it running and it would hone the cylinders.........so the dope did it.........then it really smoked! The only fix for a worn engine is a rebuild, nothing that comes in a in a can or bottle will fix anything. Sometimes if you have gummed up lifters, you can add 1 qt. of tranny fluid and drive it 1,000 miles but that's just about all you really can do for a sludgy crankcase besides a complete teardown and cleaning to do it right. :bglasses:
