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If you leave the valve in the exhaust and just fasten it open you can always turn it into a exhaust brake later. I didn't realize it worked as a exhaust break unless you modified it somehow. I thought it was just for warm up only, stock from the factory.
It was intended for warm up purposes but is easily modified. Someone had a thread about it on hear or maybe on diesel bombers.
and I can see the oil running out around the shaft.
