🛠️ DIY: How to adjust the valves on a Craftsman (Briggs) 17.5HP OHV Engine

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In this video, I show you how to adjust the valves on a Craftsman LT1000 mower with a Briggs 17.5 HP OHV Engine.
Equipment and Tools used in this video:

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Instructions and specifications:

The B&S 17.5HP engine is used on many models of riding lawn tractors. The mower in this video is a Craftsman LT1000, but this guide will work for all other brands and models. Here is a partial list of lawn mower brands that have this engine in one or more models:

Troy-Bilt
Husqvarna
John Deere
Poulan Pro
Ariens

This guide work for all models - except early production vertical models 110000, 120000

This video will show you step by step instructions for how to adjust the intake and exhaust valves on a Briggs & Stratton OHV motor. This video include instructions on how to determine which valves are the intake and exhaust valves, and how to find top dead center (TDC).

NOTE: Check valve clearance while the engine is cold.
1. Turn the crankshaft counterclockwise until the 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” (6mm).

3. Using a feeler gauge (A, Figure 41), adjust rocker nut to obtain the clearance as listed on the bottom o this answer.

4. Hold rocker nut and tighten the rocker ball setscrew (B) to the torque valve of 45 lb-in. (5 Nm).

5. Check clearance again and re-adjust, if necessary.

6. Repeat for the other valve.

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

Block Image
Vertical Models 110000, 120000 Early Production

1. Using a feeler gauge (A, Figure 42) adjust the locking hex nut (B) to obtain the

correct clearance as listed on the bottom of this answer.

2. Repeat for the other valve.

Block Image
- OR -

1. Loosen jam nut (A, Figure 43) at base of rocker arm stud. Then, using a feeler gauge (B), turn rocker arm screw (C) to obtain the correct clearance as listed on the bottom of this answer.

2. Hold the screw and tighten the jam nut to value 45 lb-in. (5 Nm).

3. Check clearance again and re-adjust, if necessary.

Block Image
MODEL 110000 HORIZONTAL SERIES

Valve Clearance – Intake .004 - .006 in. (.10 - .15 mm)

Valve Clearance – Exhaust .009 - .011 in. (.23 - .28 mm)

MODEL 120000 HORIZONTAL SERIES

Valve Clearance – Intake .004 - .006 in. (.10 - .15 mm)

Valve Clearance – Exhaust .009 - .011 in. (.23 - .28 mm)

MODEL 150000 HORIZONTAL SERIES

Valve Clearance – Intake .004 - .006 in. (.10 - .15 mm)

Valve Clearance – Exhaust .009 - .011 in. (.23 - .28 mm)

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MANUFACTURER'S DESCRIPTION:

Briggs & Stratton 31R907-0007-G1 500cc 17.5 Gross HP Engine
500cc, 17.5 horsepower
This genuine 500cc single cylinder engine offers dependable power for your equipment needs. With a power rating of 17.5 HP, this engine features a premium Dual Clean air filtration system, electric with recoil backup starter, and maintenance-free Magnetron electronic ignition. With a manufacturer limited warranty of 2 years consumer use/1 year commercial use, this engine includes a Dura-Bore cast iron cylinder sleeve, installed muffler, fuel pump, oil filter and 9 amp charging system.

Dura-Bore cast iron cylinder sleeve for extended life
Exhaust included
Overhead valve design (OHV) for cooler operation and long valve life
9 amp charging system
Consider These Factors :
Vanguard OHV engines are cast iron cylinder sleeve engines – for continuous heavy duty applications
Intek OHV engines run cooler and deliver more power, longer life and fuel economy - for more power
Standard engines are aluminum cylinder bore, side/overhead valve engines - for general consumer use
Horizontal and Vertical Shaft Engines
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Видео 🛠️ DIY: How to adjust the valves on a Craftsman (Briggs) 17.5HP OHV Engine канала Jungle Explorer