12.5 BS vertical shaft engine torque?

Mr. T. Minnesota · Jun 10, 2022

Forum,
Have been working on an old Toro riding lawn mower. I had to replace the stator. What is the torque spec for the flywheel? Second question is if the torque is too loose could that cause the flywheel key to shear? Any and all thoughts are welcome.

Rodney51Cub · Jun 10, 2022

I can look it up if you post model number of engine.

tractorguy2 · Jun 10, 2022

I have never torqued a flywheel. Just give it a short hit with the impact. In order to torque the flywheel. You need the special tool to hold the flywheel from
turning. I have them for the small 3.5 to 5hp engines. Didn't bother with getting the tools for the larger engines since the impact works just as good and simpler
and faster. Not being tight enough can cause a key to shear. All my years as a Snapper dealer I only ever saw one 12.5 hp shear a key. He was mowing weeds well
over six foot tall. Killed it several times before he sheared the key.

timcasbolt · Jun 10, 2022

(quoted from post at 00:12:39 06/11/22) Forum,
Have been working on an old Toro riding lawn mower. I had to replace the stator. What is the torque spec for the flywheel? Second question is if the torque is too loose could that cause the flywheel key to shear? Any and all thoughts are welcome.

ea, I just smack 'em down with the impact, too. If I was to guess, probably 60-80 ft./lbs.

oldsarge · Jun 11, 2022

I do it in German,,,,,,,,gutentite

Mr. T. Minnesota · Jun 11, 2022

(quoted from post at 03:27:59 06/11/22) I have never torqued a flywheel. Just give it a short hit with the impact. In order to torque the flywheel. You need the special tool to hold the flywheel from
turning. I have them for the small 3.5 to 5hp engines. Didn't bother with getting the tools for the larger engines since the impact works just as good and simpler
and faster. Not being tight enough can cause a key to shear. All my years as a Snapper dealer I only ever saw one 12.5 hp shear a key. He was mowing weeds well
over six foot tall. Killed it several times before he sheared the key.

Thanks for the replies. I will torque the flywheel to about 60 ft lbs.
Will come to this site again with questions.
Model 286-707
Type 0452.01
9034274D

Rodney51Cub · Jun 11, 2022

Technical spec's from Briggs

Model Series 286707
Displacement 466
Oil Capacity 48 oz (1.4 l)
Valve Configuration L-head
Flywheel Torque 100 lb/ft (135.5 Nm)
Governor Arm Torque 45 lb/in (5.0 Nm)
Carb Mount 100 lb/in (11.5 Nm)
Plug Gap 0.03 in (0.75 mm)
Intake Valve .005-.007 in (.13-.18 mm)
Exhaust Valve .009-.011 in (.23-.28 mm)
Idle Speed 1750
Air Gap .010-.014 in (.25-.36 mm)
Flywheel Puller Part 19203
Flywheel Holder Part 19433
Connecting Rod Torque 185 lb/in (21.0 Nm)
Sump Torque 200 lb/in (22.5 Nm)
Head Torque 165 lb/in (18.5 Nm)

Mr. T. Minnesota · Jun 11, 2022

(quoted from post at 21:30:26 06/11/22) Technical spec's from Briggs

Model Series 286707
Displacement 466
Oil Capacity 48 oz (1.4 l)
Valve Configuration L-head
Flywheel Torque 100 lb/ft (135.5 Nm)
Governor Arm Torque 45 lb/in (5.0 Nm)
Carb Mount 100 lb/in (11.5 Nm)
Plug Gap 0.03 in (0.75 mm)
Intake Valve .005-.007 in (.13-.18 mm)
Exhaust Valve .009-.011 in (.23-.28 mm)
Idle Speed 1750
Air Gap .010-.014 in (.25-.36 mm)
Flywheel Puller Part 19203
Flywheel Holder Part 19433
Connecting Rod Torque 185 lb/in (21.0 Nm)
Sump Torque 200 lb/in (22.5 Nm)
Head Torque 165 lb/in (18.5 Nm)

Thanks for the specs! 100 lb/ft - a lot of torque!!!

Russ from MN · Jun 14, 2022

That's about how much my best impact puts out on it's lowest setting.

12.5 BS vertical shaft engine torque?

Mr. T. Minnesota

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Rodney51Cub

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tractorguy2

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timcasbolt

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oldsarge

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Mr. T. Minnesota

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Rodney51Cub

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Mr. T. Minnesota

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Russ from MN

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