Question about Garden

1 Answer

Briggs lawnmower 5-hp engine locked up due to overheating of piston along full length of cylinder at valves. Engine ran well for about 10 hours service after recent overhaul, but did appear to be running full open and not controlled by govener. What caused the overheat & how can I correct the problem?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,040 Answers

Well, if it did lock up on you, then you will need another engine rebuild. The reason for this happening in the first place is because it was running wide open. The governor spring must have been hooked up wrong, causing the motor to run full blast.


Posted on Sep 10, 2010

  • Jim Parker
    Jim Parker Sep 16, 2010

    Did this help?


  • paul_eaton Sep 19, 2010

    Thanks Jim!



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

What causes push rods to bend on left bank of a 20 HP V- Twin

Here's some generic answers, not relating to this engine specifically:
  • The timing could be off, so the piston is hitting the valve.
  • A loose pin in the piston could be allowing it to extend too far, shoving on the valve.
  • I guess the valves could need to be adjusted so there's a gap.

Jun 02, 2015 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Crankcase is full of fuel


The float and needle valve in your carburetor are not working as they should. The float should force the needle valve into the carburetor body to stop the flow of gas when the float bowl is full. When the float and needle valve do not work as they should, the gasoline keeps flowing into the float bowl and into the carburetor, and into the cylinder where it flows past the piston rings and into the crank case.
The carburetor needs to be removed and cleaned.

May 15, 2015 | Briggs & Stratton Briggs Stratton Vanguard...

3 Answers

I have a 21 hp Briggs and Stratton model #331877, what are the valve settings?

Intake 003 - .005
Exhaust .005 - .007

Adjusted with the piston 1/4" past TDC of compression stroke for each cylinder.

Apr 10, 2015 | Craftsman Garden

1 Answer

How do you adjust valves

Check valve clearance while the engine
is cold.

1. Turn crankshaft counterclockwise until
piston is at top dead center on the
compression stroke. This prevents the
compression release from holding the
valves open.
2. Insert a narrow screwdriver or rod into the
spark plug hole as a gauge, then slowly
turn crankshaft counterclockwise until the
piston has moved down the bore by 1/4"
3. Using a feeler gauge, adjust
rocker nut to obtain the clearance.
4. Hold rocker nut and tighten the rocker ball
setscrew to the torque valve.
5. Check clearance again and re-adjust, if
6. Repeat for other valve.
7. If twin cylinder repeat the above for the other cylinder.

NOTE: On some models, the nut and setscrew
are positioned above the push rod ends.

Mar 14, 2015 | Briggs & Stratton 31N707-3026-G5 500cc...

1 Answer

Briggs and Stratton 23 hp lawnmower engine exhaust valve keeps sticking

it is possible that the valve stem is bent or has a build up on the stem that is jamming in the guide. Pull the head and replace the valve.

Sep 27, 2013 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

How do set valve lash

Turn the motor until the piston is at TDC. Look through the spark plug hole. piston to top of the cylinder. Then set them like you would any OHC rocker arm. BE very careful with the exhaust valve adjustment. There is like a mini disc on top of the valve stem spring keeper. If you get it too loose on a vertical engine it can drop out and it will take you forever to find the little bugger!

Below is only a recommendation....

I don't know how many hours that are on this engine your working on but... I would recommend you hand lap the valves with grinding compound if you know it has high engine hours. It will make it easier to start and have more power. The exhaust valves on these engines get very noteable black gunk buildup in the seat to the point you can not see the "valve to seat" mating ring on the valve head. The heads are not hard to remove... (One at a time) just time consuming. It can be a chore getting the valve push rods aligned with the engine horizontal. Most of the time and I know good Mechs don't like to hear this.. you can reuse the cyl head gasket on this model due to the design. Once in a while they break not very often.

The valve springs have keyhole locks on the keeper.

Thanks for using FixYa,


Apr 30, 2010 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

0 compression onright cylinder

If you have 0 compression then either a valve is stuck open or you have a broken compression ring or hole in the piston. You will have to take the engine apart to find the problem.

Apr 24, 2010 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

I have a 22 hp V Twin ELS Briggs. After setting up a while during winter I found the intake push rods were bent (5-09). I removed both heads and repaired. Ran like a new one all summer. About a month ago I...

Push rods are not the same length Refer closely to the manual.

Push rod problems can also be due to valve adjustment. When adjusting the valves check to see if the rocker nut has a torx set screw in the center. Read Manual carefully.

Personal notes:

This is a recurring problem for the engine.

Have you been keeping up with regular oil changes? Have seen stuck valves more in B&S engine if owner could not remember the last oil change.
Use the good stuff and change every 30 hours.

Rotate engine by hand after long terms of setting up. imagine setting peacefully after a long winter and some pushes your starter switch and you go from 0 to 3600 RPM, something going to give.

Lastly do a exhaust manifold Temp test after it warms up and running at full speed. is one side hotter than the other. It is also not uncommon for the High speed jet to be clogged causing one to starve and run lean, by product over heat. Try using a fuel inhibitor with some carb cleaner. Also stay away from ethanol fuel if you can, there is a difference.

Hope one of the tips help to solve your problem.


Dec 22, 2009 | Craftsman 20 Hp 42" Deck Lawn Tractor

1 Answer

Briggs and Stratton 16 hp v twin..replaced con rod and piston

Needle and seat not functioning ... float stuck or trash in needle and seat of carb.

Jul 08, 2009 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Briggs and Stratton OHV V-Twin 24hp repetitive valve adjustment

Try pulling out the choke a little, if it stops backfiring the mixture is too lean, check the intake
pipes at the cyl head and also the plastic runners to the carb for leaks.
Dennis in Chicago

May 07, 2009 | Briggs & Stratton Briggs Stratton Intek V...

Not finding what you are looking for?
Garden Logo

Related Topics:

47 people viewed this question

Ask a Question

Usually answered in minutes!

Top Garden Experts

Dennis Key
Dennis Key

Level 3 Expert

2478 Answers


Level 3 Expert

594 Answers

john h

Level 3 Expert

12650 Answers

Are you a Garden Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides