Found Loose Cylinder Bolt

"Ben Jackson" wrote in message
news:jMcYb.46366$uV3.92300@attbi_s51...
In article ,
Greg Hopp wrote:
On preflight I noticed a little oil seeping around the bolt on the
pilot's front cylinder (Superior Milleniums).

A guy across the hanger row from me lost a cylinder in flight on a
relatively new (60-70 hour) engine. Looking at the studs it appeared
that one bolt had been lose and backed off, allowing the other 3 to
shear off. I'd be looking at what kind of damage might have happened
to the adjacent studs while the bolt was loose.

What kind of engine only has three studs/bolts holding the cylinder on?
OBTW nuts go on studs not bolts.


--
Ben Jackson

http://www.ben.com/

"Dave Stadt" wrote in message
...

"Ben Jackson" wrote in message
news:jMcYb.46366$uV3.92300@attbi_s51...
In article ,
Greg Hopp wrote:
On preflight I noticed a little oil seeping around the bolt on the
pilot's front cylinder (Superior Milleniums).

A guy across the hanger row from me lost a cylinder in flight on a
relatively new (60-70 hour) engine. Looking at the studs it appeared
that one bolt had been lose and backed off, allowing the other 3 to
shear off. I'd be looking at what kind of damage might have happened
to the adjacent studs while the bolt was loose.

What kind of engine only has three studs/bolts holding the cylinder on?
OBTW nuts go on studs not bolts.

There would be six nuts holding each of four cylinders down on an O-200
Continental, the standard engine on a Cessna 150. IIRC, 2 are AN5 and 4
are AN6, i. e., the stud diameters are 5/16" and 3/8" respectively. I
watch my nuts, you should pardon the expression. They have anti-sabotage
paint on them and palnuts are even better. Torque is often not enough to
hold them from backing off, and they certainly do not have (and are not
supposed to have) lockwashers under them.



--
Ben Jackson

http://www.ben.com/