40N877-0046-B5 Briggs and Stratton Engine - Overview

Sections of the 40N877-0046-B5

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Valve, Oil Drain – Part Number: 1723165SM
Valve, Oil Drain
PartSelect #: PS8890934
Manufacturer #: 1723165SM
$38.95
  Special Order
Key-flywheel – Part Number: 222698S
Key-flywheel
PartSelect #: PS8925657
Manufacturer #: 222698S
This is a Genuine OEM replacement part used on a variety of Lawn and Garden equipment. The key helps to secure Flywheel in place. This is a Metal Key and it is Sold Individually. You would need Plier...
$5.95
  In Stock
Sealant-liquid – Part Number: 100106
Sealant-liquid
PartSelect #: PS8816307
Manufacturer #: 100106
It is a genuine manufacturer-supplied item that is made for use with Briggs and Stratton engines that are commonly installed on a variety of lawn and garden equipment. This is a special liquid sealant...
$24.95
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18oz 30w 4 Cycle Oil – Part Number: 100005
18oz 30w 4 Cycle Oil
PartSelect #: PS8817222
Manufacturer #: 100005
This bottle of oil can be used in over 150 different types of machinery. It is most commonly used for pressure washers and generators from manufacturers such as Briggs and Stratton and Troy-Bilt. This...
$8.95
  In Stock
Bolt – Part Number: 690311
Bolt
PartSelect #: PS9062886
Manufacturer #: 690311
$7.95
  Special Order
Key-woodruff – Part Number: 690979
Key-woodruff
PartSelect #: PS9063568
Manufacturer #: 690979
This timing key is an OEM direct from Briggs & Stratton. The metal component is compatible with many small engines, and is sold individually. The key secures the shaft in the crankshaft. A wrench is o...
$5.95
  Special Order
Gasket-exhaust – Part Number: 690970
Gasket-exhaust
PartSelect #: PS9063564
Manufacturer #: 690970
This is a genuine OEM sourced replacement exhaust gasket. It is specially made for use with Briggs and Stratton engines commonly used on Toro lawn and garden equipment. Its purpose is to provide an ai...
$8.95
  In Stock
Screw – Part Number: 691183
Screw
PartSelect #: PS9294598
Manufacturer #: 691183
$5.95
  Special Order
Screw – Part Number: 691061
Screw
PartSelect #: PS9063630
Manufacturer #: 691061
This is an authentic OEM component from Briggs & Stratton. The magneto armature screw is compatible with many lawn and garden engines. The hardened metal screw helps to mount the magneto armature. A w...
$5.95
  Special Order
Cover-rocker – Part Number: 499600
Cover-rocker
PartSelect #: PS8983389
Manufacturer #: 499600
$29.95
  Special Order
Seal-dipstick Tube – Part Number: 691032
Seal-dipstick Tube
PartSelect #: PS9063583
Manufacturer #: 691032
This is an authentic OEM sourced replacement part which is specially designed for use with lawn and garden equipment. The purpose of this part is to provide a tight seal between connected parts, over ...
$9.95
  Special Order
Seal-o Ring – Part Number: 691031
Seal-o Ring
PartSelect #: PS9063625
Manufacturer #: 691031
This authentic item is supplied directly from the original equipment manufacturer for use with engines, outboard motors, portable generators, snowthrowers, and lawn mowers made by Briggs & Stratton an...
$9.95
  Special Order

Questions And Answers for 40N877-0046-B5

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Common Symptoms of the 40N877-0046-B5

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Engine misfires
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Keep searches simple. Use keywords, e.g. "leaking", "pump", "broken" or "fit".
Engine quit due to valve guide sliding out causing rocker arm to be immovable resulting in bent push rods.
Clean engine with a Gunk type product. Remove valve cover. Loosen bolts and remove old cylinder head. One bolt is located inside valve cover area. Remove old gasket and inspect and clean that surface. Attach new head with new gasket using existing bolts. Torque to 18'#s with a cross type pattern. Attach new rocker arms and push rods. Set valve clearance to .004 - .006. Attach valve cover with gasket. Check oil level. Start and let it warm up. Let cool remove cover then check valve clearance again. Replace cover.
Parts Used:
Head-cylinder
  • D from HUNTSVILLE, AL
  • Difficulty Level:
    Really Easy
  • Total Repair Time:
    30 - 60 mins
  • Tools:
    Nutdriver, Socket set
19 of 22 people found this instruction helpful.
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Bad governor
Look on YouTube for video's on how to replace a Briggs governor. There are several there. My favorite, with best explanation, is, "Easily Replace Briggs Governor Gear (V-Twin Intek Engine) with Taryl". https://www.youtube.com/watch?v=wn3eanGxSEA&t=152s.

Taryl (probably not his real name) does a very good job of showing step-by-step the whole procedure, along with some additional hints/tricks/techniques of value.

Not including oil and filter, I spent less than $50 for a new governor, gasket, and drive shaft seal. That's all that is really necessary to replace is those three parts. That is, unless pieces of the old governor tore up a gear, valve, or something else. Inspect everything! {I was lucky and only the governor was destroyed}

One word of note. Be sure to clean out all of the debris from the blown governor. Be sure to remove the spark plugs and carefully rotate the drive shaft while looking for nooks-and-crannies where debris can hide. I tried to use a magnet to help, but it didn't help much, even though the block is aluminum.

Good luck.
Parts Used:
Gear-governor
  • John from BROOKVILLE, IN
  • Difficulty Level:
    Easy
  • Total Repair Time:
    1- 2 hours
  • Tools:
    Nutdriver, Pliers, Socket set, Wrench set
9 of 18 people found this instruction helpful.
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Rod broke ruining the case and camshaft
dissembled ordered repair parts, piston ,upper case, rod, camshaft, seal kit, and motor maintenance CD
The camshaft first provided did not have the compression release device on it and the cam lobe position was all wrong for the model engine I had. .
Parts Select provided me with the proper cam Shaft. Removed engine from mower (Scag Freedom Z) 15 minutes, drained oil, flipped upside down removed bottom case, removed wrong cam shaft, reinstall new valve lifters, camshaft with decompression release on it matching dots on crankshaft. Used paint brush to coat all parts heavily with motor oil.
Do not put sealant on case gasket,(it might change crankshaft end play), retorqued bolt in alternating pattern, placed nylon pipe tape on drain plug threads, and reinstalled engine on mower. It started instantly and ran extremely smooth with no oil burn or vibration.

I am very happy with the support and quick mshipping Parts Select provided..
Parts Used:
Camshaft
  • Arthur from SAINT JO, TX
  • Difficulty Level:
    Really Easy
  • Total Repair Time:
    30 - 60 mins
  • Tools:
    Socket set
3 of 3 people found this instruction helpful.
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