Show  The B&S 31G777 engine has an OHV (overhead) design and a vertical PTO shaft. This engine is equipped with float type carburetor and an electronic ignition system. The B&S 31G777 engine used a dual elementr air filter. It is equipped with an electric starter (12V). The cylinder bore is 90.6 mm (3.57 in) and the piston stroke is 77.8 mm (3.06 in). This engine produced 17.7 PS (13.0 KW; 17.5 HP) at 3,300 rpm of horsepower. The breakdown of the engine code is as follows:
General informationEngine SpecificationsModelB&S 31G777 IntekType4-stroke, OHV, single-cylinderDisplacement501 cm 3 (30.6 cu-in)Max. horsepower17.7 PS (13.0 KW; 17.5 HP) at 3,300 rpmMax. torque–Fuel systemFloat type carburetorCooling systemForced-airIgnition systemElectronicLubricating systemFull pressureStarting systemElectric starterFuel usedGasolineFuel tank capacity–Cylinder Block and HeadCylinder blockCompression ratio:–Bore x Stroke90.6 mm X 77.8 mm (3.57 x 3.06 in)Sleeve internal diameter90.500-90.600 mm (3.563-3.5669 in)Number of piston rings (compression / oil):2 / 1Side clearanceTop0.05-0.12 mm (0.002-0.005 in)Second0.05-0.12 mm (0.002-0.005 in)Oil0.05-0.12 mm (0.002-0.005 in)Ring end gapTop0.150-0.230 mm (0.0059-0.0091 in)Second0.350-0.450 mm (0.0138-0.0177 in)Oil0.150-0.250 mm (0.0059-0.0098 in)Connecting rod small end ID20.330-20.370 mm (0.8004-0.802 in)Piston pin outer diameter20.310-20.290 mm (0.7996-0.7988 in)Cylinder HeadValve Arrangement:OHV (overhead)Valves:2Valve steam diameterINTAKE5.920-5.970 mm (0.233-0.235 in)EXHAUST5.920-5.970 mm (0.233-0.235 in)Tightening torque specsTightening torque specsAir cleaner base6.0 Nm; 4.4 ft·lbAlternator2.0 Nm; 1.5 ft·lbArmature3.0 Nm; 2.2 ft·lbBlower housings10.0 Nm; 7.4 ft·lbBlower housing brackets10.0 Nm; 7.4 ft·lbBreather3.0 Nm; 2.2 ft·lbCarburetor to intake manifold8.0 Nm; 5.9 ft·lbCarburetor solenoid5.0 Nm; 3.7 ft·lbConnecting rod17.0 Nm; 12.6 ft·lbControl bracket5.0 Nm; 3.7 ft·lbCrankcase sump25.0 Nm; 18.5 ft·lbCylinder head25.0 Nm; 18.5 ft·lbCylinder shield5.0 Nm; 3.7 ft·lbExhaust manifold / adapter19.0 Nm; 14.0 ft·lbFlywheel nut135.0 Nm; 100.0 ft·lbFlywheel fan16.0 Nm; 11.9 ft·lbFuel pump10.0 Nm; 7.4 ft·lbGovernor lever nut5.0 Nm; 3.7 ft·lbIntake manifold to cylinder head10.0 Nm; 7.4 ft·lbMuffler10.0 Nm; 7.4 ft·lbOil drain plug11.0 Nm; 8.1 ft·lbOil fill tube10.0 Nm; 7.4 ft·lbOil pump cover10.0 Nm; 7.4 ft·lbRegulator / Rectifier5.0 Nm; 3.7 ft·lbRewind starter3.0 Nm; 2.2 ft·lbRocker ball set screw or nut5.0 Nm; 3.7 ft·lbRocker cover7.0 Nm; 5.2 ft·lbStarter motor16.0 Nm; 11.9 ft·lbService InformationEngineMax speed3,600 rpmValve clearanceIntake valve clearance0.08-0.13 mm (0.003-0.005 in)Exhaust valve clearance0.13-0.18 mm (0.005-0.007 in)Oil systemOil typeAPI SF, SG, SH, SJ or higherRecommended oilSummer: SAE 30, 10W-30Winter: SAE 5W-30Oil capacity (with filter)1.42 L (1.5 US. qt, 1.25 Imp. qt.)Ignition systemSpark plugChampion RC12YCSpark plug gap0.7-0.8 mm (0.0276-0.0315 in) ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines. We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs. I managed to break the conrod on my 17.5 hp Briggs and Stratton engine. To replace the engine it will cost $1400 + so thought I might give it a crack (excuse the pun).I have taken the engine apart and it looks like I'll need a new crankshaft, conrod, piston and rings, and a compression release lever and these parts will cost $300-400. At least no damage was done to the bore or block. I spotted this little key amongst the pieces of metal in the sump. Can anybody tell me where that comes from please. It is not the key from the crankshaft timing gear as that is still in place. I will upload a few picks of the few picks of the damage as well as the mystery part. If anybody knows a good honest parts supplier in QLD preferably otherwise Australia wide I'd appreciate all recommendations. Attached Images damage3.jpg (35.16 KB, 95 downloads) damage2.jpg (38.39 KB, 95 downloads) damage1.jpg (44.97 KB, 96 downloads) Mystery key.jpg (32.14 KB, 97 downloads) Originally Posted by Mowerfreak AVB, is Piggs (ref. to management) still pumping out their engines today or are they a sinking ship who'll drag Victa down with them? Everything from seems to harder to get and if things don't turn around soon they maybe beyond saving. Many equipment OEMs cant get engines from Briggs for their newly manufactured equipment so they are having to source other engines and rework the equipment setups. Briggs did take a broadside shot so the rats are headed to lifeboats. Many of their vendors are probably not wanting to work them again after stabbed them in the back by filing bankruptcy and not paying them what was already owed. But it seems that every company is using Covid-19 as an excuse too. I got one distributor that saying they are so overworked that they cant keep up with the orders. So I giving them a break by not ordering a single thing from them until at least the end of the year. Another distributor is starting to charge a surcharge for me to use my credit card to pay them as I place orders. It may be only 1-1/2% but it is principal of the fact they are punishing us credit credit users. Yes I can just pass it along but that not the point. So with them I stopping placing order as of Wednesday until they let me know my options and make them available to me online. At least the business here is currently slow so I can ride this out for a while as I hunt new vendors. What we have is a vaccine available but here in my areas only 30% of the local have gotten it. Personally I have but many of my customer base refuse to get it. It takes four weeks for it to fully effective at 90+%. They realize too late that they needed it when they get the Covid strain and about to die. I just cant feel sorry for those had a chance but refused. We are yet again approaching 200,000 cases a day here in the states. How do I know what size connect rod to get?A Connecting Rod is measured between the centers of the crankshaft journal bore and the piston pin bore. It can be listed in inches or millimeters. The connecting rod's length will impact Rod Ratio . Also, changing the rod length will require new pistons with the correct Compression Height .
Are all connecting rods the same?The materials used for connecting rods widely vary, including carbon steel, iron base sintered metal, micro-alloyed steel, spheroidized graphite cast iron. In mass-produced automotive engines, the connecting rods are most usually made of steel.
How many cc is a 17.5 HP Briggs and Stratton engine?This genuine 500cc Briggs & Stratton single cylinder engine offers dependable power for your equipment needs.
What causes connecting rods to fail?Lack of lubrication is the number one cause of rod bearing failure. The root cause of the issue could be anything from a low oil level to a faulty oil pump. Clogged oiling passages can also lead to isolated bearing failures.
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17.5 hp briggs and stratton connecting rod
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