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Torquehd
Posted on Saturday, April 14, 2018 - 05:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Crappy way to start the mowing season.

After a new battery, oil, plug, fuel lines, my riding mower started on the first crank.

Mowed half the yard then it died.

Cranked the starter. THUD. Will not turn over.









Looks like the valve keeper let go, the valve fell into the cylinder, and got impounded into the head....
Hope I can find parts.

Do you think I should tear the bottom end open? The piston has a very small gouge but I think I can knock down the bur with some sandpaper and reuse it?
The Cyl wall looks just fine and (with the top end off) the bottom end turns over with no issues.

Looks like a new head, complete, will run around $170 online.
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Greg_e
Posted on Saturday, April 14, 2018 - 08:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Weld it or fill it with aluma-weld, replace valve, run it. It's a lawn mower, no one is going to die if it stops working while running.
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86129squids
Posted on Saturday, April 14, 2018 - 10:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Buy a couple of goats. Yard done, free milk and cheese, then a BBQ after a while.
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Ourdee
Posted on Saturday, April 14, 2018 - 10:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I would just cut the burr off with a wood chisel by hand. ie. no hammer. Throw in a new valve and lap it in. Wipe it out. Rub oil on the cylinder wall, and button it up. GOLDEN.
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Griffmeister
Posted on Saturday, April 14, 2018 - 10:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just be sure that the piston comes up to the top of the cylinder or else you may have a bent rod that will blow apart on the second half of the lawn.
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Torquehd
Posted on Saturday, April 14, 2018 - 11:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the advice guys. The valve impacted the valve guide so I'll have to check it out further tomorrow. Not buying a whole new head would be a lot friendlier on the bank account.

I hate goats but I'll eat them if I'm hungry.

However, I LOVE a lamb steak : )

The wife and I wanted to get a few sheep prior to moving across country. We're renting now but that's in the long term plans for when we get to move back home to Wa.

(Message edited by torquehd on April 14, 2018)
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Greg_e
Posted on Sunday, April 15, 2018 - 11:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If the valve guide is shot, that might be an issue. What kind of motor is it? Could you drop a brand new one from Harborfreight in there?
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Torquehd
Posted on Sunday, April 15, 2018 - 11:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah it's prettty jacked.





I've never dealt with valve-related damage before so I'll listen to whatever advice you guys have.
I could use a rotary tool and remove the portion that got smashed up into the valve tract. But it seems like that part keeps the valve straight, and having a mangled guide would cause problems in a short time.
I think a new head might be the best answer.
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Akbuell
Posted on Sunday, April 15, 2018 - 12:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Were it me, I would first check and confirm that the con rod is not bent, and the crankshaft is still straight. Sudden stoppages like that send massive forces through the entire rotating mass, possibly in excess of structural strength.

If that is all good, next would be 'is the valve guide replaceable'? It may not be, and a new head would be, IMHO, the most efficient response. If the guide is replaceable, heat and special drifts (punches) would be needed . . . .

Hope this helps, Dave
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Xbduck
Posted on Sunday, April 15, 2018 - 12:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Figure out what motor you have and what head will fit it. Then go to metal re-cyclers or the local landfill and see what you can find on the cheap. The re-cycler will charge scrap weight and the landfill people usually don't care what goes out because they know it will be back later.
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Ourdee
Posted on Sunday, April 15, 2018 - 12:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Craigslist a used mower for under a hundred and swap motors.
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86129squids
Posted on Sunday, April 15, 2018 - 12:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)



Actually, a very good idea! Every time I head to the recycling place, while I'm waiting in line, I get out of the truck and just look around. It's amazing what people just throw away... it's worth asking the guys working there what they might know about that could be viable. I've seen a few fairly decent looking gas grills that could be had for scrap weight.

Oftentimes you'll have a local small-motor fixit guy who should have what you need, for short money. Sometimes it's fun to poke around at a junkyard, not so much a landfill...
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Greg_e
Posted on Sunday, April 15, 2018 - 03:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

That doesn't look like it actually hit the guide, just the casting around the guide. Should clean right up with a grinder.
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Ourdee
Posted on Sunday, April 15, 2018 - 03:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have a chuck off a drill mounted on a T-handle that I use for that kind of work. I just chuck up a proper size bit and work it by hand.
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Strokizator
Posted on Sunday, April 15, 2018 - 07:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

With luck you live near a small-engine guy who can knurl and ream the valve guide for a couple of bucks. Otherwise, the tools to make the repairs cost more than a new Chinese engine
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Xbduck
Posted on Sunday, April 15, 2018 - 10:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

At the landfill in my county the metal parts and pieces are kept separate from the general landfill mass because it is sent out to a recycler. I have seen a number of motorcycle and atv frames, push lawn mowers and riding mowers. Everything short of cars and trucks.
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Torquehd
Posted on Sunday, April 15, 2018 - 11:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I currently live nowhere close to a landfill, only a transfer station. My previous residence was the same, but at least there they had a decent lot at each station - computers, glass, metal, wood, yard waste, etc. Here, everything just gets chucked into a trailer and hauled across the state.
Checked craigslist. I'd be better off buying a new head.
Think I'll play with the dremel tool and see how much further I can mess it up. Then buy a new head if needed.
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Greg_e
Posted on Monday, April 16, 2018 - 09:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You really have little to lose by working on it, you already consider it junk so how much worse can you make it. It either works when you are done, or it is still junk. The most you'll be out is time and the valve parts (valve, spring, keepers, seal, spring cap thing).
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Sifo
Posted on Monday, April 16, 2018 - 11:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just curious what brand this is. Honda? It's not the typical B&S flat head design.

I agree with those who are saying do what you can to drop a new valve in on the cheap. Clean up the path for the stem, lap the valve/seat, smooth the piston, and put it back together. If the valve stem feels loose in the guide compared to the other valve, consider finding a small engine repair shop that can knurl and ream the guide back to spec. If the bottom end blows up, you have little invested. The chances of it working out are fairly good.
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