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40T677 (0001-G1) Briggs and Stratton Engine - Overview

Sections of the 40T677

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Engine Oil Seal – Part Number: 795387
Engine Oil Seal
★★★★★
★★★★★
(2)
PartSelect #: PS9151828
Manufacturer #: 795387
This OEM Seal-Oil (PTO Side), also called the Oil Seal, is a Black, Nitrile Rubber, 2/14 O.D., individually sold part which is installed using a Seal Puller. Customers rate the installation difficulty...
$9.69
  In Stock
Order now and your part arrives by Apr 6
Engine Oil Seal – Part Number: 391086S
Engine Oil Seal
★★★★★
★★★★★
(1)
PartSelect #: PS9277860
Manufacturer #: 391086S
The Oil Seal is a manufacturer-approved rubber part which provides a seal between the crankcase and crankshaft by attaching around the axle shaft on the crankhouse housing. Installation is rated as "M...
$8.09
  In Stock
Order now and your part arrives by Apr 6
Engine Cylinder Head Gasket – Part Number: 693997
Engine Cylinder Head Gasket
PartSelect #: PS9067184
Manufacturer #: 693997
This is a replacement cylinder head gasket for your small engine. The gasket is approximately 5 inches in length and 5 inches in width at its longest and widest points. The gasket creates a seal, and ...
$30.09
  In Stock
Order now and your part arrives by Apr 6
Engine Oil Filter – Part Number: 696854
Engine Oil Filter
PartSelect #: PS9065087
Manufacturer #: 696854
This genuine OEM oil filter helps to remove harmful contaminants from engine oil. It is designed for a variety of Engines. It is sold Individually. This part maintains optimum performance of your engi...
$17.25
  In Stock
Order now and your part arrives by Apr 6
Key-flywheel – Part Number: 222698S
Key-flywheel
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★★★★★
(1)
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...
$6.40
  In Stock
Order now and your part arrives by Apr 6
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...
$6.40
  In Stock
Order now and your part arrives by Apr 6
Gear-governor – Part Number: 793338
Gear-governor
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(1)
PartSelect #: PS9151758
Manufacturer #: 793338
Ensure smooth and balanced operation of your Briggs and Stratton engine with this exceptional Gear Governor. It's intricately designed to maintain control over the speed of the engine, contributing to...
$40.69
  On Order
Gasket-intake – Part Number: 690949
Gasket-intake
PartSelect #: PS9063610
Manufacturer #: 690949
It is an authentic part that is supplied by the original equipment manufacturer for use with Briggs and Stratton engines commonly installed on lawn and garden equipment. The purpose of this gasket is ...
$6.40
  In Stock
Order now and your part arrives by Apr 6
Screw – Part Number: 691108
Screw
PartSelect #: PS9064541
Manufacturer #: 691108
This is an authentic OEM sourced replacement part that is intended to be used with lawnmower engines and outboard motors from Briggs & Stratton and Toro. The metal screw is used to secure the rocker c...
$6.40
  In Stock
Order now and your part arrives by Apr 6
Hose-vacuum – Part Number: 791766
Hose-vacuum
PartSelect #: PS9306672
Manufacturer #: 791766
This genuine part is sourced directly from the original equipment manufacturer. It is specially designed for use with Briggs and Stratton engines commonly installed on lawn and garden equipment. The p...
$10.60
  In Stock
Order now and your part arrives by Apr 6
Seal-valve – Part Number: 690968
Seal-valve
PartSelect #: PS9073136
Manufacturer #: 690968
This is a genuine OEM part. The Briggs & Stratton valve seal is used on many lawn tractor machines. The metal part stops oil from moving into the cylinder from the valve stem. This item is often faste...
$15.97
  On Order
Vacuum Hose – Part Number: 596163
Vacuum Hose
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★★★★★
(1)
PartSelect #: PS12089844
Manufacturer #: 596163
$12.44
  In Stock
Order now and your part arrives by Apr 6

Questions And Answers for 40T677

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Common Symptoms of the 40T677

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Engine misfires
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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
16 of 19 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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