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 "New" b&s 21hp engine

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Speedfreek241
Screwdriver
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Speedfreek241


Age : 23
Join date : 2013-07-12
Posts : 137
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Location : Loxahatchee

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PostSubject: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeWed May 07, 2014 10:05 pm

So my mom blew up her motor in the mower we use to now the lawn and thankfully the warranty was still good and they replaced it. After some negotiation with Sears they let me keep the old motor. I have removed the flywheel and found the rotor, block, and the stator all broke. But even with all these off the engine still is a pain to get to turn over and sometimes only will backwards.
"New" b&s 21hp engine  Image39 here's the flywheel with one of the magnets broken off and the rest scuffed bad. "New" b&s 21hp engine  Image41
This is the block with two bolts that used to hold the flywheel broke off.
I'm wondering what it could be internally that would cause it to lock like this.
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willis923
Hammer
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willis923


Age : 25
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Location : Galway NY

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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeWed May 07, 2014 10:14 pm

could have thrown a counterbalance, the crank bearings could have worn, giving the crankshaft play and allowing it to rub on top, wrecking a whole host of stuff

_______________________________________________
-1974 bolens 1055 (Rolling Thunder)
-1989 Craftsman GT6000 (Blockhead)
-2004 Ford F-250 super duty FX4
-1999 Ford F-350 Superduty 4x4 7.3 Powerstroke


Lt wrote:
Feel free to try... Dont let anything but fear and common sense stop you. 


"New" b&s 21hp engine  Pbucket

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1st Lieutenant, Volunteer Firefighter, EMT-B, Galway Vol Fire co. Galway NY
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Speedfreek241
Screwdriver
Screwdriver
Speedfreek241


Age : 23
Join date : 2013-07-12
Posts : 137
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Location : Loxahatchee

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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeThu May 08, 2014 7:45 am

I'm thinking it's something to do with the crank. I'm going to pull it apart this weekend hopefully and see what I can find is wrong.
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willis923
Hammer
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willis923


Age : 25
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Location : Galway NY

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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeThu May 08, 2014 8:21 am

if it was over-revved, the internal governor mech could have come apart too

_______________________________________________
-1974 bolens 1055 (Rolling Thunder)
-1989 Craftsman GT6000 (Blockhead)
-2004 Ford F-250 super duty FX4
-1999 Ford F-350 Superduty 4x4 7.3 Powerstroke


Lt wrote:
Feel free to try... Dont let anything but fear and common sense stop you. 


"New" b&s 21hp engine  Pbucket

Chat moderator

1st Lieutenant, Volunteer Firefighter, EMT-B, Galway Vol Fire co. Galway NY
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Speedfreek241
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Speedfreek241


Age : 23
Join date : 2013-07-12
Posts : 137
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Location : Loxahatchee

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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeThu May 08, 2014 10:26 am

Yeah I'm going to have to tear it apart because it only mowed my lawn like 4 times and was never over-revved. All I know is it ran one day I shut if off came back a couple days later and it was locked up. I got it to turn and started it but I heard a bad rattling noise so I shut it off.
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willis923
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willis923


Age : 25
Join date : 2013-04-10
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Location : Galway NY

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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeThu May 08, 2014 11:04 am

probably crank bearings

_______________________________________________
-1974 bolens 1055 (Rolling Thunder)
-1989 Craftsman GT6000 (Blockhead)
-2004 Ford F-250 super duty FX4
-1999 Ford F-350 Superduty 4x4 7.3 Powerstroke


Lt wrote:
Feel free to try... Dont let anything but fear and common sense stop you. 


"New" b&s 21hp engine  Pbucket

Chat moderator

1st Lieutenant, Volunteer Firefighter, EMT-B, Galway Vol Fire co. Galway NY
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Speedfreek241
Screwdriver
Screwdriver
Speedfreek241


Age : 23
Join date : 2013-07-12
Posts : 137
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Location : Loxahatchee

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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeSun May 11, 2014 5:37 pm

Well I got to work on it today and noticed the only reason it still wasn't turning was the bottom shaft was rubbing the box. My flywheel that I ordered will be in soon and I'm going to have k2500lifes brother weld back in the mounts for the stator. I'm still waiting to order a replacement stator.
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Doug
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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeSun May 11, 2014 6:19 pm

Pff you dont need no stator.

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Speedfreek241
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Speedfreek241


Age : 23
Join date : 2013-07-12
Posts : 137
Forum Rep : 0
Location : Loxahatchee

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PostSubject: Re: "New" b&s 21hp engine    "New" b&s 21hp engine  Icon_minitimeSun May 11, 2014 9:12 pm

I know I don't need a stator but I want to keep one on there to charge the batterie and run the lights.
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