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#1
07-02-18, 00:21
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HD oil issues - My Humber Mk4 Armoured car had an engine rebuild at the shop in the UK. With less that 50 hours of run time, we burned up no4 Main bearing.
The final understanding was that during the engine rebuild, two oil channels (which has a freeze plug type cap on one end, and a bolt on the other) was not opened and cleaned out. We put HD oil in for our running in. Apparently, it dissolved the sludge and circulated it to the oil sump/pan. The pick-up for the oil pump has a metal wire filter. That was completely sludged over. The resulting oil starvation caused #4 piston main bearing - a poured babbet bearing - to melt. We had a machine shop remove all the babbet bearings and switched to cap bearings. We are better off having cleaned the oil journals, but some $4,000 poorer for having to pull the engine and the rebuild. So.... no more HD oil for my stuff! 
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#2
07-02-18, 01:31
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Jim, based on a similar bad experience I had, I'd be more inclined to blame the shop than the oil.
I had a local shop do machining on a Chevy engine. As normal, they hot-tanked the engine first. But, like your shop, they didn't remove all the gallery plugs and flush/brush the galleries out. Luckily I noticed when I got it back. I removed the plugs and found a large amount of sludge behind them that had been softened to a semi-liquid by the caustic cleaning solution. I shudder to think what that stuff would have done to the new bearings as soon as the oil started circulating. Malcolm
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