Re: [OMC-Boats] Need help with Props, Thrust Washers 1970 Sportsman

...and, it helps if you can find the actual prop shop that does the work and go there directly.  Most boat stores and repair shops send prop work out them mark up the price 50-100% for their handling and your convenience.  If you can locate a local shop that does the work and take the prop there yourself, you'll typically save about $50 per prop.

----- Original Message -----
From: "Lee Shuster (lib1)" <lib1@...>
To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...mate.com>
Sent: Monday, June 8, 2009 9:55:21 AM GMT -05:00 US/Canada Eastern
Subject: Re: [OMC-Boats] Need help with Props, Thrust Washers 1970 Sportsman

Also, any decent prop shop could refurb, rebalance, even re-pitch your  
OMC prop., making it as good as new. Check your yellow pages.

On Jun 7, 2009, at 7:47 PM, Andy Perakes wrote:

> A washer's primary job is to spread load over a larger surface area  
> to prevent localized loads from exceeding materials limits.  Fairly  
> significant impact loads can be generated when the drive is engaged  
> (forward or reverse).  In these cases, the thrust washer's job it to  
> take very high localized loads from the pin (a theoretical line  
> contact about 1/4" long and infinitely thin) and distribute them  
> over a larger surface area on the prop. (You probably know this, but  
> you always want to spread loads over the largest possible area to  
> minimize the pressue (i.e. lbs per square inch) --  think about snow  
> shoes.)  The washer is made from a material more forgiving to these  
> loads whereas the prop is made from fairly brittle aluminum.  The  
> failure mode I would expect to see without the washer is for stress  
> cracks to appear where the pin contacts the prop.  These would  
> appear over time and eventually could propogate to the point of prop  
> failure, but that would take awhile and you'd most likely notice  
> noise or vibration and catch the problem before the prop completely  
> failed.  It does look like you have a little wear from the end of  
> the pin striking the prop (caused by the extra gap due to the  
> missing washer), but if you don't see any surface cracks in the prop  
> and everything else looks good, I'd put it back together (with the  
> washer, of course) and not worry about it.
>
>
> ----- Original Message ----- From: "William R. Lindow, DMD" <williamlindow@...
> >
> To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...timate.com
> >
> Sent: Sunday, June 07, 2009 8:56 PM
> Subject: [OMC-Boats] Need help with Props, Thrust Washers 1970  
> Sportsman
>
>
>> It appears that my prop has been running without a thrust washer.
>> What damage could happen without it.  My original OMC prop is pretty
>> chewed up so I wanted to replace it.  It is the white one in the
>> pictures.   What is the missing thrust washer supposed to do? The
>> first prop I bought is a new Michigan prop 14x16 012092 that is
>> supposed to fit however the back inside is different than the OMC
>> prop.  The next prop I bought is a Michigan prop 14x18 012093 PR 124
>> and it looks similar on the inside but has two channels running
>> through it which the original does not.  Hopefully the pictures may
>> help someone figure this out for me.
>>
>> Thanks,
>>
>> Bill
>>
>>
>>
>>
>>
>>
>
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Received on Monday, 8 June 2009