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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › best way to hold crank
11-10-2005 01:47 AM  12 years agoPost 21
11290

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Evansville, IN and Orlando, FL

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I guess I tightened mine too tight. Broke the delrin crank locking tool.

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11-10-2005 08:39 AM  12 years agoPost 22
jkelly

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Bedford, PA

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The flywheel wrench is good but it's a pain when dial indicating having to take it off put it back on and so forth. I guess using long set screws instead of bolts may work but I just use it for removal. I also think that the flywheel can rotate when trying to tighten the nut but it probably depends on the type of mechanics. Hirobo uses a single taper collet versus MA and JR and the dual taper collets. With the crank lock no such problem. Also if you use the dead blow technique to align the flywheel you need something to hold the crank in place.

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11-18-2005 03:44 PM  12 years agoPost 23
Sky 5

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Spring Hill, Tn

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The piston lock and crankshaft lock tools impose stress on the piston, rod, rod bearing and crank pin WAY beyond design limits. By the way, the prop nut does not need 500 ft lbs of torque to secure it. Have you ever noticed how small the crank pin, piston pin and piston rod are? The piston rod bearing is made of brass. We all know how soft brass is. Yes? The best way to hold a an engine is with a strap wrench around the clutch/fan aluminum flywheel . The strap wrench I'm referring to is the plastic handle with rubber strap model found at most tool outlets such as Sears or Harbor Freight. Use some common sense and Loc-Tite when tightening the prop nut. Using the strap wrench method the engine's internal parts never see any stress.

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11-19-2005 05:30 AM  12 years agoPost 24
jkelly

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Bedford, PA

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For that matter just wrap a shop towel around the fan and tighten. Sky 5, so what do you hold while trying to screw on a threaded flywheel like used on a Raptor?

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11-19-2005 09:41 AM  12 years agoPost 25
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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The best way is the Min Air fan wrench
Not for use on a fan that threads on.
For that matter just wrap a shop towel around the fan and tighten.
Again, not for thread on fans. A blanket statement does not apply here.Especially cheap plastic Raptor fans, as they love to come loose from the hub. If your method works for you great, but passing on wrong and bad info doesn't help anyone. Sky5, have you ever wondered why OS designed the tool? I suggest all the New Helimen do a search on this subject. You'll find every path has been beat to death, and then some.

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11-19-2005 01:11 PM  12 years agoPost 26
Sky 5

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Spring Hill, Tn

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I should have qualified my statement. I was referring to Hirobo products. What's a Raptor?
The point I am trying to make is that you can put 15-20 ft lbs of torque on a piston, crank pin or rod that is designed to see less that 1 ft lb or ounce inches of torque without damaging it to some degree. Think about the little piston cocking in the cylinder, the stress on the piston pin and piston skirt. For the love of god save the the little pistons!

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11-19-2005 03:03 PM  12 years agoPost 27
Butch

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New York

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cranklock tool
Sky,
Agreed, tightening is accomplished with the crank-pin and bushing involved....apply mechanical knowledge while tightening.

The piston and upper rod-end should be "floating" in the cylinder bore, unaffected, if correctly using a crank-lock tool.

IMO to properly tighten this type of assembly, " Metal-to-Metal" contact is required. The rubber-strap has "give".

Good luck....Happy Flying

The Whirlybug Bit Me!

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11-19-2005 10:06 PM  12 years agoPost 28
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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What's a Raptor?
A modern helicopter. We flew Shuttles in the 1980's. You've never used our method, so please don't tell us what we've been doing wrong all this time. We have used your method though, and can show you where it's flawed.

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11-19-2005 11:44 PM  12 years agoPost 29
Sky 5

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Spring Hill, Tn

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so please don't tell us what we've been doing wrong all this time.
Roger that.

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