Another day, another silly question:
Several folk recommend de-stressing the very hard crankshaft on this motor. As you know this involves putting with the bread at 230 C for 45 mins .....
Two questions really - is this procedure needed? (I do crash my planes regularly) and
When I remove the shaft the rear ball race seems firmly attached to it. Doesnt detach easily so didnt want to bash it and possibly deform it. Assuming crank should be baked, is it OK to leave ball race on?
Any celebrity chefs out there, your opinions are valued.
It sounds like a lose/lose situation to me. Yes you might destroy the ball race if you heat it to 230 C for 45 minutes, particularly if it has a brass or even non metallic cage. There's no easy low risk way to get the race off the shaft if it's stuck. Mostly you replace a race if it has to be pried off. Can you get a replacement race? I've heard of the soaking the crank at 230C treatment but is this necessary for all versions of the Marz? Heat treatment of Steel is an intricate process that's usually performed with some reliable information about the characteristics of the metal. There's a lot of magical thinking concerning HT on the internet. Might be better to leave it as it is, the Marz engines my fellow club members have had haven't broken their shafts, but they all use ignition improver and know how to tune a diesel. If the worst happens buy another Marz. There's no shortage of 'em.