![]() ![]() A pressure test of the cylinder head also needs to be undertaken to ensure that there are no hairline cracks anywhere. If any evidence is seen that the cylinder head is out of true, it must be skimmed back to flat at a machine shop. One method of checking flatness is to use a feeler gauge and a straight edge. The mating surfaces should be cleaned in a way which will not damage the surface in any way. It is critical that this part of the job be carried out with near surgical precision. If they are agreeable and do the work, explain that you will have the car compression tested again once they've completed the job.ĭuring the replacement of a head gasket, a vital step is to ensure that the block and head mating surfaces are both perfectly clean, straight and crack free. If it transpires that there is an issue, I'd speak to the first workshop and see if they'd be willing to effect a warranty repair or offer some reduction to rectify the problem. It won't cost much but will tell you conclusively if you have an issue with the cylinder head gasket. Ask them to provide you with the results. Then I checked the bottle of fresh clean oil, and it fluoresces green too! Weird! So, that's pleasantly meaningless.My suggested course of action would be to take the car to another workshop and ask them to perform two tests a compression test and a leak down test. I checked the oil fill hole with the blacklight again, and was dismayed to see that the oil definitely had a greenish fluorescent tinge. Still no smoke in the exhaust or chocolate milk in the engine, at least. The coolant tank has been overfull since they replaced the radiator last year, though, and I may have overfilled it previously, too, since the tank is almost impossible to see through. I know from previous head gasket experience that the coolant tank overflowing can be a bad sign. It definitely looks like oil now, though.īut when I stuck a straw down there the other day, it came back with an inch of black goop covering it, and I see black spill marks on and around the recovery tank, so I think it overflowed the cap and pushed the layer of oil out: I checked the coolant again today, added a little water so it came up to the top, and it doesn't look so bad, just a few drops: My friend drove the car for ~400 miles and nothing major happened. ![]() Last oil change and inspection was 4 months ago. Under a blacklight, the little oil puddles in the oil fill hole might be fluorescing green? Or it could be my imagination, it's really hard to tell. How do I judge the urgency of this? Is it ok for my friend to drive it 200 miles? :/ĭrove it around for a few miles, temperature was perfect, no smoke in exhaust, no milkiness in dipstick or oil fill hole. I think that part of the coolant tank has been dark for a long time, but it's hard to remember. I don't know if this is fresh oil or it's been in the tank for years. I don't think the coolant level has changed since then. ![]() Radiator was replaced over a year ago because the fan thermostat was broken and it was overheating when I stopped moving, and bursted the radiator plastic. I did recently get a pending check engine code P1? for the coolant temperature not being high enough? But most of the time I'm driving it's in exactly the middle where it's supposed to be, never goes over. The oil level is normal and doesn't seem frothy. A little deeper is clean coolant, and the coolant in the top of the radiator is clean. I was going to loan my car to a friend tomorrow, and checked the oil and tire pressure etc earlier this week, but couldn't see the coolant level, so I just went to double-check it with a drinking straw, and pulled out black goop floating on the coolant.
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