RCU Forums - View Single Post - Bolts Keep Coming Loose in the Header

02-15-2017 | 10:51 PM

#7

Dave Harmon

Joined: Jul 2002

Posts: 689

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From: Sperry, OK

Quote:

Originally Posted by bkanter3

HI David:

For some strange reason Yamada uses 3.5MM socket head bolts on the 60 long stroke instead of the 4MM ones on the short stroke. It's hell trying to get he 3.5'd any way, Home Depot has the 4's. I just left my engine with a machine shop to drill and tap it to 4MM. The info you just gave me looks very interesting and will check it out. Thanks, Bill

I always installed HeliCoils in those holes. Then you can really torque them tight....I flew those engines for years and never had one loosen up.

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