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rebuilt the engine on my 77 lemans approx 700 miles ago. gilardoni cylinders and heads redone. been noticing the plug on the right has been a bit darker and rich. im using individual choke levers as opposed to the singular cable and lever style. runs good, hard to start occasionally from what I assumed is the rich plug, left is a nice brown color. what's really concerning me is when I look through the spark plug hole and the left is dry and still appears dull grey metal but the right one has a bunch of dark build up on it and appears slightly oily and shiny. rubbed a tip on it and came out a little oily.just wondering what I need to do at this point? take heads off and examine pistons unobstuctred? I have an auto zone compression tester I can use incase of bad ring run inthanks and all help is appreciatedAllen
Shiny dark deposits are usually an oil issue . Without seeing the assembly process , I'm curiousif there's a ring alignment concern or possibly a leak in the head gasket from the oil return holeinto the cylinder ? If it doesn't improve soon , it's a quick head removal and maybe barrels .Good luck , PeterForgot to mention , have you re-torqued the heads yet , that's plenty of mileage since assembly . I'veusually done mine the second time by that mileage .
Well this is my first complete rebuild, so yes, I may be worrying too much. I’ve never built an engine before so I’m always “worrying” if I didn’t do something correctly, as in just realizing I never checked the ring gap on the new gilardonis. I assumed since new I didn’t need to. They may be fine but i should have checked. But, dry clean piston top with a dry good plug on one side and a slightly oily piston top with a fouled plug leads me to believe the rings in the right didn’t bed in yet or properly.
The plugs didn’t really concern me as I’d just go through the carbs and adjust accordingly. It was the oil on the threads that got me to look into the plug hole and see the differences on the piston top. Granted, you can’t see much but what I did see got me thinking and worrying a bit post image online
Thx Phil, so I shouldn’t really worry about what I see on the pistons? I just figured it wasn’t a coincidence that the darker plug accompanied the built up piston top. Especially since it’s still only 700 miles after rebuild? I need to check my idle jet and needle positions regarding the carbs, it’s stock jetting with Zards and K&N filters. Think it’s running rich up to 1/4 throttle. I moved to the burbs from the sticks so I haven’t been able to open her up for a while. Plus I just got over my clutch hand being repaired. Severed a few tendons from grinding wheel gone awry-Allen
rings not seating was what I was thinking. what do I do about the plug getting fouled though? im using maxima 4 racing oil 20/50 Dino
I would run a leak down test to see what results I got from both sides.
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