Repair manual for surging engine

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  #1  
Old 05-18-09, 05:36 AM
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Repair manual for surging engine

In reference to my previous post, "Surging Intek engine", I haven't got much response so I'd like to find a repair manual but can't find the model series online. The B&S engine says "17.5 HP I/C" and "OHV" on the engine, it's single-cylinder, and the model series is 310000. It was purchased on a Murray lawn tractor in early 2005 in FL.

Can anyone help me find the appropriate repair manual for this engine?

Thanks!


Steve
 
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  #2  
Old 05-18-09, 06:26 AM
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The manual you need is #276781. You can buy it here:

Parts & Supplies - Briggs & Stratton
 
  #3  
Old 05-18-09, 06:55 AM
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In your previous post you were advised to clean the carburetor. Surging is an indication of a carburetor problem. Typically a restriction in one of the fuel passages.

About surging:
Why is my new engine hunting and surging?

About surging:
Why does my engine seem to go up and down in RPM's (runs rough) ?

Carburetor overhaul:
What are the procedures to follow when overhauling the carburetor?
 
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Old 05-19-09, 12:19 AM
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What info are you looking for? In your last thread, we told you what to do to correct the problem. There was no reply by you to prompt further discussion.
 
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Old 05-19-09, 07:35 AM
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Well, I was just trying to get some leads. I appreciate the responses. I'll get started cleaning/rebuilding the carb. Three questions first though:

In the troubleshooting guides for these symptoms, I keep seeing "Fuel problems or contamination". The machine was outside and it rained hard the night before the problems started so I'm wondering if water in the fuel is something I should eliminate first? If so, how to do this? Just drain the fuel tank?

Are there parts I should order that I might need before starting so I can get it done in one session?

The instructions from Airman at the last link for overhaul seem pretty generic. I'm a little concerned that I'll get stuck at some point.

Thanks!

Steve
 
  #6  
Old 05-19-09, 08:43 AM
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Post the MODEL, TYPE and CODE of your engine.
 
  #7  
Old 05-19-09, 09:23 AM
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As well as draining the fuel tank you'd also have to drain the float bowl.
 
  #8  
Old 05-19-09, 01:18 PM
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Model 31C707
Type 0154E1
Code 041124ZD
 
  #9  
Old 05-19-09, 05:44 PM
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Water is heavier than gas, so it will be at the bottom of the tank, in the line, filter, and carb bowl if it is present in any substantial quantity. In either case, you still have to remove the carb bowl, so I'd start there, then look for water in the bowl (will look like bubbles or beads). If none present, then you can continue with cleaning the carb.

To remove the bowl, unscrew the fuel shutoff solenoid from the bottom and the bowl will drop. The condition of the bowl and what you see in it will determine the next steps.
 
  #10  
Old 05-20-09, 06:28 PM
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Didn't have a chance after work today to check the fuel. Hopefully tomorrow.

By the way, with the engine running the way it is, will it harm anything further to use it this weekend if it turns out water is not the problem?

Thanks with your help with this. The last thing I need right now is to have to buy a new tractor.

Steve
 
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Old 05-20-09, 07:21 PM
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If it's surging, it is running lean. Running lean is not good for an engine and can cause damage over extended run time. Why not just clean the carb when you pull the bowl off? You'll already be in the problem area and all you probably need is a 2 dollar can of carburetor cleaner.
 
  #12  
Old 05-21-09, 03:53 PM
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Originally Posted by cheese View Post
In either case, you still have to remove the carb bowl, so I'd start there, then look for water in the bowl (will look like bubbles or beads). If none present, then you can continue with cleaning the carb.
If water is present, what's the next step?
 
  #13  
Old 05-21-09, 07:30 PM
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I have the bowl off and can't see anything that looks like water. There's some dark specks in the fuel though. Do I also need to drain the fuel tank?

I've cleaned the carb without removing or changing the setting of any mixture screws. Anything else I need to do or should I just reinstall and see how it works?
 
  #14  
Old 05-22-09, 12:08 AM
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Reinstall and see how it does. If it continues to surge, back out the mixture screw a little to see if that helps. Don't worry about draining the tank, especially since there was no evidence of water in it.
 
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