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Why does a Pratt and Whitney R-985 engine quit running when master cylinder blows?
Wiki User
∙ 11y ago
There are a lot of ways a cylinder can "blow".
If a piston burns through, it will keep running, but with a dead hole.
Same thing if a cylinder head cracks.
However, the master con rod is on #1 cylinder and the journals for the other 8 are machined into it. A failure of the #1 rod could conceivably destroy the timing enough that the others are out too. A catastrophic failure in the top (#1) jug could also send bits of metal into the crankcase.
Wiki User
∙ 11y ago
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You have no brakes on your 96 Ford Ranger when it is running but when is not running it seems to be fine?
The issue here sounds like it's the master cylinder failing. It is not retaining pressure when the engine is running. The reason they feel fine when the engine is not running is because the failing master cylinder is not getting power, and in essence is being bypassed.
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