nut on the flywheel

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ifitwasus

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1970 85 horse evinrude. The nut on top of the flywheel keeps coming loose. Any suggestions onkeeping it tight?
 
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boobie

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Re: nut on the flywheel

NO lock washer !! Torque it down to 100-105 Ft Lbs.
 
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emdsapmgr

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Re: nut on the flywheel

OMC recommends replacing it every time it is removed. Usually it can be re-used a few times with no problem. If it keeps coming loose, as yours is-I'd replace it with a new one and torque it to the spec boobie has indicated. If the crank taper and flywheel mating surfaces are dirty, you may have to go through a cleaning procedure, called "lapping the flywheel."
 
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ifitwasus

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Re: nut on the flywheel

What its the best way to hold the flywheel still to tighten it?
 
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TrickyRicky

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Re: nut on the flywheel

On my engine I use a Flywheel Holder for an auto engine by Snap on. Also I use blue locktite on threads. It will come off without heating.
 
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Toughlife200700

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Re: nut on the flywheel

boobie what problem would a lock washer incur to it? I might learn something.. I have used them a couple of times with no problems but it has been on smaller engines. I'm still learning all this and love the different answers and problems that might be avoided..
 
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boobie

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Re: nut on the flywheel

Think about this. How many lock washers do you see in the assembly of an outboard motor ???
 
Tim Frank

Tim Frank

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Re: nut on the flywheel

boobie said:
Think about this. How many lock washers do you see in the assembly of an outboard motor ???
Click to expand...

I've seen quite a few....:D
But I'd agree 100% that I've NEVER seen one used on a flywheel nut. I don't know why either, but there must be a reason. ;)
 
nwcove

nwcove

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Re: nut on the flywheel

boobie said:
Think about this. How many lock washers do you see in the assembly of an outboard motor ???
Click to expand...

im glad there are no lock washers!! bad enough to reassemble one and have four or five extra bolts, extra prop, etc, laying on the bench!!....a hand full of orphaned lock washers would make me question my work!!! :p
 
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durban

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Re: nut on the flywheel

if every thing else fails then drill & tap between nut & sharft & fit a 5mm hex grub screw then its on for good
 
Tim Frank

Tim Frank

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Re: nut on the flywheel

Tim Frank said:
I've seen quite a few....:D
But I'd agree 100% that I've NEVER seen one used on a flywheel nut. I don't know why either, but there must be a reason. ;)
Click to expand...

Rethinking this....
I quite cavalierly thought of lock washers on carb float bowls...and some other places....but I do a lot of tinkering with small air-cooled engines and I may be blurring recollections.
I am now thinking of one specific O/B...and all repairs that I have done to it....and cannot think of a lock washer anywhere. :redface:

So is there a reason that they don't need lock washers? :confused:
 
nwcove

nwcove

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Re: nut on the flywheel

Tim Frank said:
Rethinking this....
I quite cavalierly thought of lock washers on carb float bowls...and some other places....but I do a lot of tinkering with small air-cooled engines and I may be blurring recollections.
I am now thinking of one specific O/B...and all repairs that I have done to it....and cannot think of a lock washer anywhere. :redface:

So is there a reason that they don't need lock washers? :confused:
Click to expand...

proper torque on all the fasteners does the job.
 
T

Toughlife200700

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Re: nut on the flywheel

im definetly going to have to take a pic of the top of the flywheel of my 59 model O?B. it has a lock washer under the flywheel nut and the oem replacement part for this washer is a lock washer. plus have them on the choke wire connection and the brackets that hold the choke plunger onto the bottom of the carb plus the start mounts.. lol
 
matt167

matt167

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Re: nut on the flywheel

Lots of things were done different back then. They used to put cars together with carriage bolts, and close was good enough in many cases.

Lock washers shouldn't be used in an application where accurate torque is required.. Modern times, you'll almost never see it.. Lock washers are used when things are just snugged tight and do not require accurate torque. This would be the " close is good enough " case from the past
 
Tim Frank

Tim Frank

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Re: nut on the flywheel

matt167 said:
Lots of things were done different back then. They used to put cars together with carriage bolts, and close was good enough in many cases.

Lock washers shouldn't be used in an application where accurate torque is required.. Modern times, you'll almost never see it.. Lock washers are used when things are just snugged tight and do not require accurate torque. This would be the " close is good enough " case from the past
Click to expand...

and

proper torque on all the fasteners does the job.
Click to expand...

Yup. Makes sense, TY.

Re: nut on the flywheel
Click to expand...
..and every time I see the title of this thread i can't help thinking "man...and they tell you in the Operators' Manual to keep your fingers away from the flywheel..." :eek:
 
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