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Noise from engine.


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#1 bbuckler OFFLINE  

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Posted February 17, 2016 - 07:19 PM

What do yall think ? 



#2 glgrumpy ONLINE  

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Posted February 17, 2016 - 08:04 PM

Sticky valve, that delays coming back to seat a moment and kinda snap/bangs on the lifter or seat?  Whatever it is, seems to be when something is changing directions in movement of a said part. Could it just be a rod end worn and when stroke changes it moves to other side of the ovaled rod bore?  Maybe even on small end in piston pin area?


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#3 bbuckler OFFLINE  

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Posted February 17, 2016 - 08:19 PM

Sticky valve, that delays coming back to seat a moment and kinda snap/bangs on the lifter or seat?  Whatever it is, seems to be when something is changing directions in movement of a said part. Could it just be a rod end worn and when stroke changes it moves to other side of the ovaled rod bore?  Maybe even on small end in piston pin area?

Sound like I'm better off rebuilding the other engine to go back on.


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#4 DennyIN OFFLINE  

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Posted February 17, 2016 - 08:45 PM

Maybe put a wedge in the valves when they are open then rotate the engine and see if it still does it? If it does make the noise then, you will have an indication it is in the bottom end.


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#5 637Yeoman OFFLINE  

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Posted February 17, 2016 - 08:51 PM

Rod knock?


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#6 larrybl ONLINE  

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Posted February 17, 2016 - 08:58 PM

Maybe put a wedge in the valves when they are open then rotate the engine and see if it still does it? If it does make the noise then, you will have an indication it is in the bottom end.

Makes sense. Maybe even pull the valves completely. Sounds related to the cam movement. 


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#7 bbuckler OFFLINE  

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Posted February 17, 2016 - 09:08 PM

I will give it all a try tomorrow. If I find a problem I will probably rebuild the old engine. Just got to raise the funds I guess since I got a deck I could sell off my craftsman.

#8 classic OFFLINE  

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Posted February 17, 2016 - 09:08 PM

I bet you won't hear it if you remove the valves. Watch the cam lobes in relation to the sound. There doesn't seem to be any noise when the cam lobes are not touching the tappets. The valve lash is probably excessive and the seat margin is probably wide on the valves and valve seats. Valve seats should be cut to 31° and 46° to narrow the valve seats, and the valves should be ground to 45° or just buy new valves.
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#9 DougT ONLINE  

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Posted February 17, 2016 - 09:43 PM

Are you sure it isn't just the governor weight flopping as it rotates? Was the engine knocking before it was torn down or didn't it run? If it sat awhile, maybe its a tight wrist pin and forcing the piston in the bore. Putting pressure on the top of the piston while you turn it should change the noise to check.


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#10 bbuckler OFFLINE  

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Posted February 17, 2016 - 09:49 PM

Are you sure it isn't just the governor weight flopping as it rotates? Was the engine knocking before it was torn down or didn't it run? If it sat awhile, maybe its a tight wrist pin and forcing the piston in the bore. Putting pressure on the top of the piston while you turn it should change the noise to check.

it was a non runner when I got it. It also had water it the oil.

#11 EricFromPa ONLINE  

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Posted February 17, 2016 - 09:51 PM

My big briggs on my SS14 has an exhaust valve that sounds like that.Runs fine though.It's Not the 1st big briggs that I've had that had a little noise in the exhaust valve.

 

If you want you can pull the valves and lightly sand the stems with Emery cloth then reinsert them and check valve lash.Yours sounds a tiny bit louder than mine does.I suspect it has carbon build-up on the valve stem.These old briggs were known for sticking exhaust valves if they sit for a while.

 

I'm going to pull mine all apart once I get the parts.Waiting for my connecting rod,rings and gaskets to show up.My Rod is a little to loose to use but heck i got a new one for $24 shipped.


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#12 bbuckler OFFLINE  

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Posted February 18, 2016 - 04:18 PM

I pulled the rod cap off at BDC so I didn't messed up the rings but when I torqued it to spec I can't turn the engine. 



#13 larrybl ONLINE  

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Posted February 18, 2016 - 04:29 PM

Did you get it on backwards? Been there - Done that.



#14 bbuckler OFFLINE  

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Posted February 18, 2016 - 04:40 PM

Did you get it on backwards? Been there - Done that.

I better check. Also the cam shaft has a lot of play I can wiggle it quite a bit. 



#15 olcowhand ONLINE  

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Posted February 18, 2016 - 05:35 PM

Sounds like gear lash being taken up when the cam comes off the lifter.  


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