Models > 40T677

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

Sections of the 40T677

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Rod-Push (Steel) – Part Number: 690981
Rod-Push (Steel)
★★★★★
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(1)
PartSelect #: PS9062983
Manufacturer #: 690981
This is a replacement steel push rod for your lawn tractor engine. The engine will have two push rods; one made of steel, and one made of aluminum. This part is made of steel and is approximately 6 in...
$6.89
  On Order
Seal--Oil (PTO Side) – Part Number: 795387
Seal--Oil (PTO Side)
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(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...
$7.88
  In Stock
Gasket-CylinderHead – Part Number: 693997
Gasket-CylinderHead
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 ...
$26.91
  In Stock
Seal,Oil – Part Number: 391086S
Seal,Oil
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(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...
$6.59
  In Stock
Key-Flywheel – Part Number: 222698S
Key-Flywheel
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(1)
PartSelect #: PS8925657
Manufacturer #: 222698S
$4.99
  In Stock
Cylinder Head – Part Number: 796231
Cylinder Head
PartSelect #: PS9152257
Manufacturer #: 796231
This is a replacement cylinder head kit for your small engine. It contains everything you will need to replace a damaged cylinder head. This is a 12-piece kit that is sold as a unit. This is an OEM pa...
$181.00
  On Order
Oil Filter – Part Number: 696854
Oil Filter
PartSelect #: PS9065087
Manufacturer #: 696854
$14.38
  On Order
Pump-Fuel – Part Number: 808656
Pump-Fuel
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(1)
PartSelect #: PS9154486
Manufacturer #: 808656
$113.45
  On Order
Gasket-Exhaust – Part Number: 690970
Gasket-Exhaust
PartSelect #: PS9063564
Manufacturer #: 690970
$5.34
  In Stock
Gasket-Intake – Part Number: 690949
Gasket-Intake
PartSelect #: PS9063610
Manufacturer #: 690949
$3.99
  In Stock
Gear-Governor – Part Number: 793338
Gear-Governor
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(1)
PartSelect #: PS9151758
Manufacturer #: 793338
$27.50
  In Stock
Cylinder Head – Part Number: 796232
Cylinder Head
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(1)
PartSelect #: PS9140434
Manufacturer #: 796232
This is the replacement cylinder head for your small engine. This is a 15-piece kit that will allow you to rebuild the cylinder head for the engine on your outdoor power equipment. The cylinder head i...
$187.88
  On Order

Questions And Answers for 40T677

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Common Symptoms of the 40T677

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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:
Cylinder Head
  • D from HUNTSVILLE, AL
  • Difficulty Level:
    Really Easy
  • Total Repair Time:
    30 - 60 mins
  • Tools:
    Nutdriver, Socket set
11 of 13 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
6 of 10 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
2 of 2 people found this instruction helpful.
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