Breather Hose coming off on Briggs

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  #1  
Old 04-12-16, 10:49 AM
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Breather Hose coming off on Briggs

I have a Craftsman DLS 3500 tractor in the shop. The breather hose keeps coming off at the carburetor throwing oil all over. The engine is a Briggs 31P977-1066-E1. I planned to put a hose clamp around the hose however I thought I would check here to see if anyone else has encountered this. What do you think could be causing it to come off.
 
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Old 04-12-16, 12:19 PM
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I'd suspect high crankcase pressure due to failed head gasket or bad rings. You could check the breather valve, but it's really just a check valve so I wouldn't expect failure to blow the hose off.
 
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Old 04-12-16, 12:27 PM
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This is the engine that was serviced by Sears and the Technician somehow dropped a tiny ball bearing that ended up in the cylinder. It tore up the combustion chamber and top of the piston. I smoothed it up and put a new head gasket. Right after the repair, the hose blew off the carb. I figured I had just forgot to connect it. This being the second time, I need to find out why this is happening. A compression test yielded 70 PSI. Here is the original post http://www.doityourself.com/forum/ou...ed-advice.html
 
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Old 04-12-16, 03:28 PM
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Check your oil level, make sure it is not overfull.
 
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Old 04-12-16, 05:16 PM
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If the oil level is correct and the oil isn't thinned by gas and the engine is not running faster than it should, then you have gasses leaking past either the piston and/or the head gasket. If the bearing caused damage to the piston, it could have made the rings stick, but these engines are prone to head gasket failures. Did you check to see if the head was not warped?
 
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Old 04-12-16, 05:38 PM
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I actually would check the oil because as much time as was spent trying to start it, I wonder how much fuel prime it was given when it wouldn't start.....btdt

Recently had a generac generator, guy still had it on the truck said it was leaking gas out of the carb. I pulled the dipstick and gassy oil ran out of the oil fill
 
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Old 05-13-16, 12:44 PM
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I thought I would provide a followup to this issue. I put a small hose clamp around the tube at the carburetor. It is working fine. I cleaned the manifold boss where it mounts real good. I think that when the hose came off the first time, blown oil got on the boss and the that is why the hose would not stay on. I cut grass with it this morning for over a half an hour and it seem fine -- no smoke, oil etc.
 
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Old 05-13-16, 12:46 PM
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Thanks for the update, hope it keeps working for you!
 
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