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  #1  
Old 07-08-2013, 11:21 AM
western_auto western_auto is offline
String Trimmer
 
Join Date: Jun 2013
Location: Corrigan, Tx
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Default Briggs v-twin bending intake pushrods

Briggs v-twin keeps bending pushrods.
Model 406777
Type 0128e1
Code 030610yg

Replaced intake pushrods and both bent again after 2 hours of use.

What could be causing this?
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  #2  
Old 07-08-2013, 11:55 AM
John Matthews John Matthews is offline
Rear Engine Rider
 
Join Date: May 2012
Location: Michigan
Posts: 131
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Fuel solenoid isn't shutting off and it's allowing the cylinder to fill with gas. Seen it many times.

John
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  #3  
Old 07-09-2013, 12:02 AM
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kensmobile kensmobile is offline
Senior Zero Turn Mower
 
Join Date: Nov 2006
Location: Central - TX
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After fire solenoid will not prevent a flooding carburetor from filling the cylinder with fuel. If the carburetors flooding then it's a problem with the inlet seat, needle or seal depending on the type of carburetor.

Dirty oil, plugged cooling around cylinder head, most likely valves are seizing in valve guides
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  #4  
Old 07-09-2013, 09:27 AM
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Easywheeler Easywheeler is offline
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Join Date: Jul 2012
Location: Hernando Florida
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Seen many of these engines with tappet issues, mainly burs on them.
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  #5  
Old 07-09-2013, 11:18 AM
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bgsengine bgsengine is offline
Garden Tractor
 
Join Date: Feb 2013
Location: Roulette, PA
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Check valve guides under the valve springs for signs of the guide moving out of place. Guides get loose and rocker hangs on guide, pushrod bends. *Correct* fix is replace the head set. Though I hear tell of some that "fix" the head - but for a shop, its a waste of billable time. (If you bill the time to do the "Fix" it costs more than the head set to begin with.)
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  #6  
Old 07-09-2013, 01:24 PM
SawDoc SawDoc is offline
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Location: Eastern Ky.
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I have seen this same scenario before, valve guides moving. I have thought about drilling and threading a hole half in the guide, and half in the head (after putting the guide back into position) and installing a set screw with Loctite. This probably isn't a heat issue so much as deposits on the valve stem from stale gas. If it was heat, it would most likely be the exhaust valve instead of the intake.
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  #7  
Old 07-09-2013, 01:28 PM
SawDoc SawDoc is offline
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Location: Eastern Ky.
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[quote= (If you bill the time to do the "Fix" it costs more than the head set to begin with.)[/QUOTE]

Labor for cyl. head R&R is the same regardless if you repair or replace, so that is a moot point. How long does it take to drill and tap a hole? About 10 min.?
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  #8  
Old 07-10-2013, 09:57 AM
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bgsengine bgsengine is offline
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Join Date: Feb 2013
Location: Roulette, PA
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Quote:
Originally Posted by SawDoc View Post
Labor for cyl. head R&R is the same regardless if you repair or replace, so that is a moot point. How long does it take to drill and tap a hole? About 10 min.?
Then tack on getting the guides lined up, cleaning and/or grind and reseat valves, clean up the old head, leak test, reassemble valves and leak test.. That is, if you want to make sure you do it right the first time..

Wouldn't dream of just popping a valve spring off, drill and tap a hole and put in a set screw (At risk of the valve guide cracking or deforming later on) without making sure valves seat properly, head is clean and not cracked or warped out of flat, etc.

Thanks but no thanks, we'd rather do it right and use the updated (Ever look to see how many times that part number has changed for a new head set?) head and do the job right on the first go-round. But then again maybe that's why we have a reputation for quality work... and more business than we can handle this summer (Have had to turn people away this year)
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  #9  
Old 07-10-2013, 02:15 PM
SawDoc SawDoc is offline
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I haven't tried repairing one this way, either, just something I thought of. In every case, we presented it to the customer as a lower cost option; NO warranty on this repair, the customer makes the call with an informed decision. All of our customers thus far have went with new parts and proper repair. BTW, our shop has one of the best reputations in our part of the state, with customers routinely traveling 50+ miles to get to us.
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