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Dipstick rattling

onan bf ms ss16

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#1 twofitu OFFLINE  

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Posted March 20, 2017 - 10:49 PM

I've asked this question before but I'm looking for more insight. The dipstick on my 73 SS16 rattles when the engine is running at anything but WOT. I've checked the reed valve under the lifter cover and it's ok. I was wondering if it could be the valve lash. The rubber plug is on the dipstick and the cover is secured with a small roll pin I installed when the stake broke (which I understand is common). Other than the rattling this rig runs great and has surprising power for a 24 year old machine. The old Onan is strong. Thanks

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#2 Jazz OFFLINE  

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Posted March 21, 2017 - 05:29 AM

I have a light spring on my dipstick and its fastened to engine to stop the rattling on my SS16. 


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#3 dodge trucker ONLINE  

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Posted March 21, 2017 - 06:18 AM

check ignition, and  adjustments on carb.


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#4 LilysDad ONLINE  

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Posted March 21, 2017 - 07:23 AM

Have you tried a different stick?


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#5 twofitu OFFLINE  

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Posted March 21, 2017 - 09:46 AM

The dipstick is OEM. I have a small bungee on the dipstick to hold it down. Tell me more about the ignition and carb adjustments. This engine starts easily in cold and hot weather and has good power so I didn't even consider carb and ignition. I'm coming from the angle that for some reason the crankcase is over pressure to the point that the reed valve can't handle it.

#6 LilysDad ONLINE  

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Posted March 21, 2017 - 11:16 AM

Do you have the owner's manual? If not check the Manual Section. Everyone should have an owners manual.



#7 twofitu OFFLINE  

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Posted March 21, 2017 - 12:45 PM

Do you have the owner's manual? If not check the Manual Section. Everyone should have an owners manual.


I have the manual on my iPad and I have removed and checked the reed valve. The only other place I can think of that could be letting air in the crankcase is the pulse line to the fuel pump.





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