Forum - Briggs & Stratton Racing
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huntb

Registered: 06/27/11
Posts: 3
Reply with quote  #1 

When I install the stinger clutch onto the Briggs LO206 using the hardware that came with my clutch, there is approximately 0.150 of end play between the clutch and the inside surface of the larger side of the  shoulder washer.  The clutch slides  freely back and forth along the smaller diameter of the shoulder washer which rests against the crank.  I am mounting the clutch inboard and have the radius washer installed.  I have installed the clutch as instructed in your literature that came with the clutch.  Is this the way the clutch is suppose to work?   Is this normal?  Do I need to install another washer on the shoulder washer to take up the play? If I do,  what size inner diameter should I use and how thick of a washer should I use?   I am afraid to run it this way as I believe that the clutch key will damage the crank slot.  The clutch came with the shoulder washer, the lock washer and the bolt.

 

 

BriggsRacing1

Registered: 06/22/11
Posts: 188
Reply with quote  #2 
Hunt,
        You want to call the dealer you got your clutch from and ask for the install kit that locks their clutch down tightly.  I'm pretty sure Noram offers a radius washer and a locking system with a belville washer to keep the clutch from floating.  You are 100% correct that you will damage the crankshaft key way by allowing the clutch to float. 

In our video section we have one that shows proper clutch installation.  In it you can see how to lock the clutch down correctly along with what happens when you don't.


huntb

Registered: 06/27/11
Posts: 3
Reply with quote  #3 
Briggs you are missing the point.  The clutch is installed per Noram hat washer, lock washer and bolt per their instructions.  I have seen several stinger clutches that have been installed and all of them have float.  I have called Noram with no results.  Maybe Briggs can have better results with an inside contact.
BriggsRacing1

Registered: 06/22/11
Posts: 188
Reply with quote  #4 
Hunt, I've missed a lot of boats but points I have a pretty good track record of. [smile]

The key words in your response is per 'THEIR installation instructions'.  These clutches are made for any engine with a 3/4" clutch but unlike most engines the 206 pumps out over 10 foot pounds of torque very early in the power band.  Transferring all of this at a point where a racer optimizes the clutch for engagement puts too much load across a really small key.  Even with the crankshaft being made of carbon steel the force is too great to prevent damage.  The hub has to be locked against the shoulder of the crankshaft properly to provide as much shoulder area as possible for this much force.  

If you are talking about the drum it can flop around all you want but the hub with the key way has to be locked.

If you want me to look into this further because you are seeing a fit issue I will be glad to ask someone from Noram contact you, just let me know.  
huntb

Registered: 06/27/11
Posts: 3
Reply with quote  #5 
It would be greatly appreciated if you have a contact at NORAM that can contact me about this design.  I'm sure that you have  better contacts [smile].  I have attached  the datasheet I received with the clutch that will show you what I'm talking about. It is not the standard mounting hardware with the large washer, conical washer and bolt that pushes up against the clutch housing.  The hat washer mounts against the end of the crankshaft and allows the clutch to float onto the hat washer about .150"-.170" before hitting the shoulder.   I either have to add thrust washers onto the hat washer or machine off part of the hat washer to remove the gap.  Thanks for your help and I do get your point.

 
Attached Files
pdf stinger.pdf (621.27 KB, 8 views)

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