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Following up here; I bought a bottle of Blue Devil Block and Radiator Sealer. only used half the bottle, and so far so good after 100 miles. The stuff is the color of windshield washer fluid, not full of goop or solids like some coolant system sealers...

Proximity of dipstick the only reason for ice crystals to start there and not somewhere else, just speculation, it is right under that part of block. At this point going to try a block sealing product by 'blue devil', nothing to loose, it only weeps slowly, and only under pressure. I'll post...

I thought about what may have happened to motor: Coolant did not have much anti freeze, probably had some, or it was just on verge of freezing, water in block started to freeze. What is different about that cylinder? The dip stick is there wicking some heat out of block. The freeze...

Well, the the plot thickens. Everything up and running great, notice a very slow drip of coolant coming from under engine. At first it looks like it might be leaking from under new head, but I know that could not be true. Hoping it is the nearby freeze plug, but no, it is a hairline crack in...

After testing injectors,(they test good, and pretty much all the same) I have to conclude damage was caused by head gasket leaking coolant into cylinder for a long time. This truck was a garaged fire company truck, so external source of water unlikely. Something to keep in mind if you have to...

Thanks, I'll check out the injector, I have some new nozzles and a tester. Top of piston has no impact marks. When they suck a glow plug, there is a pattern of the plug hitting top as it disintegrates, and the piston and wrist pin need to be replaced, as there is usually knock. I see what...

A lot of threads about 6.2 heads lately, thought I'd add one. Am working on another low mileage M-1008, when I got it from GSA, it had what I thought was a bad lifter. After taking valve cover off and compression test, it turns out to be exhaust valve. 400 or better PSI three cylinders on that...