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Old 11-26-2010, 05:32 PM   post #1 of 24
jbeall
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Default Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

Hi All,

I've got a Murray GT with a Briggs & Stratton 18.5 HP engine, model 42A707, type 2653 E. The gear on the starter motor that drives the flywheel has gone bad. It's just plastic and the teeth have all broken off or worn down.

I got the replacement parts but I can't get them on without taking the flywheel off, because of the way it's all put together. I got all the nuts loosened that I could see, including the big main one that holds it onto the crankshaft. But it seems frozen on the shaft--I can't get it off. I can lift up on it and it feels like the entire shaft (frozen to the flywheel) moves up a tiny fraction of an inch, and that's it.

I'm probably going to take it to a local shop tomorrow and see if they can get it off with a flywheel puller... unless anybody here has other suggestions on how I might tackle this myself :-)

Thanks!

-Josh
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Old 11-26-2010, 06:53 PM   post #2 of 24
engine2quarters
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

Huh?

My starter is bolted to the side of the engine, easy removal. Plastic starter gear rides on the outside of the flywheel. When the starter comes off, don't need to remove the flywheel. Then remove the pin, take off the stripped gear, put new one on, insert pin, reinstall starter. You're golden.

Unless I'm missing sometin'.
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Old 11-26-2010, 07:00 PM   post #3 of 24
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

This will help.http://www.mytractorforum.com/showthread.php?t=152946
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Old 11-26-2010, 08:09 PM   post #4 of 24
jbeall
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

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Originally Posted by engine2quarters View Post
Huh?

My starter is bolted to the side of the engine, easy removal. Plastic starter gear rides on the outside of the flywheel. When the starter comes off, don't need to remove the flywheel. Then remove the pin, take off the stripped gear, put new one on, insert pin, reinstall starter. You're golden.

Unless I'm missing sometin'.
On my engine, one of the bolts that holds the starter on is obstructed by the flywheel. You can't take the bolt out without first removing the flywheel.

Believe me, I have lamented over this considerably; it would have been all so easy if it wasn't designed like this!
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Old 11-26-2010, 08:21 PM   post #5 of 24
RAMJET
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

I have taken many of those starters off with the flywheel still in place. Use an open end wrench and a little patience and it will work.
Roger
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Old 11-26-2010, 08:30 PM   post #6 of 24
jbeall
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

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Originally Posted by RAMJET View Post
I have taken many of those starters off with the flywheel still in place. Use an open end wrench and a little patience and it will work.
Roger
I'll have to get some pictures to show you--it would not be physically possible to remove the final bolt holding the starter in place unless you cut it into 1/2" pieces. Here's an attempt at a diagram:


Code:
XXXXXXXXX (this is the flywheel)
     ---        (this is the bolt head)
      |          (this where the bolt threads travel)
      |
      |

There is about 3/4" clearance between the bolt head and the flywheel. It has to travel up to be removed, and the bolt is about three inches long.
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Old 11-26-2010, 09:25 PM   post #7 of 24
Walt 2002
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

Unless someone has put the wrong bolt in, which I doubt very much, the starter bolts can be removed without removing the flywheel as said above. Use a 1/2" open end wrench, TURN the flywheel until there is a recess under the flywheel which permits the bolt to come up and out. You need a B&S or B&S type puller to get that flywheel off without damaging it AND it needs to be torqued to 150 ft lbs when putting it back on. This IS NOT necessary unless the wrong bolt has been installed.

I have rebuilt dozens of these engines, removed and replaced dozens of these engines.

Walt Conner

"it would not be physically possible to remove the final bolt holding the starter in place unless you cut it into 1/2" pieces"

Pretty broad statement for someone asking advice.
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Old 11-26-2010, 09:32 PM   post #8 of 24
jbeall
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

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Originally Posted by Walt 2002 View Post
Unless someone has put the wrong bolt in, which I doubt very much, the starter bolts can be removed without removing the flywheel as said above. Use a 1/2" open end wrench, TURN the flywheel until there is a recess under the flywheel which permits the bolt to come up and out. You need a B&S or B&S type puller to get that flywheel off without damaging it AND it needs to be torqued to 150 ft lbs when putting it back on.

"it would not be physically possible to remove the final bolt holding the starter in place unless you cut it into 1/2" pieces"

Pretty broad statement for someone asking advice.
Interesting--I'll give it a second look tomorrow morning. I was basing my statement mostly on the exploded parts diagram which doesn't show a recess or anything in the flywheel, and I didn't notice it when I was messing with the engine. The exploded parts diagram also shows a long (3"?) bolt, not a short one.

Quote:
Originally Posted by Walt 2002 View Post
"it would not be physically possible to remove the final bolt holding the starter in place unless you cut it into 1/2" pieces"

Pretty broad statement for someone asking advice.
I should have said "I can't see how it would be physically possible." And, I certainly hope I'm wrong!
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Old 11-26-2010, 09:45 PM   post #9 of 24
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

My two cents! Your flywheel should be made like a hubcap with a lip about 3/4 in thickness all the way around ! The bolt your talking about can be removed (if its the original b&s bolt) with an open end wrench! The bolt will just clear the inside of the lip & then working about a half a turn at a time if that much, the bolt should back out till it almost touches the inside top of the flywheel ! In some cases it still feels like its still got a ways to go but like walt said given its the correct bolt used & you remove the easy one first & you shouldnt have to remove the flywheel
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Old 11-26-2010, 09:56 PM   post #10 of 24
jbeall
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

Thanks for the tips, guys. I can go to bed tonight with a little hope that I'll be able to resolve this myself tomorrow. I had just about given up on this one. :-)
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Old 11-26-2010, 09:57 PM   post #11 of 24
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

I love your signature, Appalachian Edge :-)
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Old 11-27-2010, 01:02 AM   post #12 of 24
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

Took a couple pictures when I had the flywheel off our 18hp ic last spring. Wasn't working on the starter at the time, but after looking at the pictures I'd take the flywheel off before fighting those bolts with it on...
hope this helps.
Jim

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Old 11-27-2010, 01:48 AM   post #13 of 24
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

B&S makes a nice flywheel puller for their engines, makes removing the flywheel easy.
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Old 11-27-2010, 11:19 AM   post #14 of 24
jbeall
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

Victory! I am happy to report that I was wrong. The flywheel has a recess that allows just enough space to get the bolt out--exactly like several here described.

However, once I got the starter motor off and the new parts on, I couldn't get the snap-ring in place that holds it all together. After several failed attempts and thinking I'd lost the snap-ring forever when it went flying the last time, I called the shop where I got the parts from. He had the tool to pound the snap-ring on and said to come on by. He put it on for me at no charge; it took him longer to find the tool than it did to put the snap-ring on :-)

So, I got home, put it all back together, and now she's working again. Thanks to everyone for your help!

-Josh
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Old 11-27-2010, 12:31 PM   post #15 of 24
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Default Re: Getting flywheel off an 18.5 HP I/C Briggs & Stratton engine

thats great & hope us guys helped out ! for future concideration you might try a small 12 point socket & a hammer to tap ring back on ! it usualy works for me !Glad you got it fixed
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