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Old 03-03-2013, 06:53 PM   #1
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blowby

engene running great 65mph sudenly lose engene power look in mirior see white them black smoke out of exht. Coast to side of road, oil blown out of blowbuy tube have towed to shop.found blown head gasket after replacing huiypump and several other parts i pay bill and leave. After 100 miles im 3qts. Low on oil oil coming from blow buy any idias.sorry 2005 c7 fleetwood discovery
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Old 03-04-2013, 03:35 AM   #2
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Find out if they did a compression check. The C7s are famous for eating piston rings (compression and oil rings) and head gaskets. A broken ring or a holed piston are the 2 leading causes of excessive crankcase pressure thus causing all the blow-by. I suspect that when the head gasket failed the coolant washed the oil on the cylinder wall(s) causing it to score and perhaps broke a ring. If it did, remember, the C7s do not have repairable engine sleeves already installed. They can be installed but often exceed the cost of simply finding another used C7 to swap.
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Old 03-05-2013, 01:29 AM   #3
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I had a similar problem with exhaust smoke, blow-by and oil in the coolant.
I decided to investigate and disassembled the engine. What I found was a cracked block in #2 cylinder wall, pretty disappointing with only 29000 mi on the motor. Unfortunately as 94-Newmar stated this engine block does not have removable sleeves making the repair much more costly and complicated. Although the machine shop said they could sleeve my block, I wasn't comfortable with that and went with a new complete engine.
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Old 05-08-2013, 08:18 PM   #4
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What was the price of a new C7 motor? Did you buy a short block or complete engine?
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Old 05-08-2013, 10:25 PM   #5
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I found a new government surplus engine, it was about 10k. It was setup for a 24 volt system, so I ended up using my original starter, alternator and computer. I also needed to change pulleys and water pump.
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