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Old 05-28-2012, 04:38 PM   post #1 of 12
ShelbyGT550
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Default Piston Corrosion On HH100

I seem to recall a thread that was posted about this same issue but not sure what engine it was one, This is on a HH100. Issues I was having is it was forcing oil out the breather. Only did it after going WOT then it did it the whole time the engine was running. Could this corrosion be the cause?









Also noticed this

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Old 05-28-2012, 04:58 PM   post #2 of 12
brokeitagain
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Default Re: Piston Corrosion On HH100

that piston looks heavily worn, have you measured it and the bore to see what is no longer round?
Take rings off place them squarely in the bore and check ring end gaps
It looks like its time for an overhaul

Has the air filter been inspected to see if it has holes in it or improperly installed, looks to be dirt ingestion causing piston scuffing and ring wear
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Old 05-28-2012, 05:49 PM   post #3 of 12
ShelbyGT550
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Default Re: Piston Corrosion On HH100

It had only a foam precleaner when I got it, No idea how long it was ran like that, I assume this is not just a stuck ring cuasing the oil blowing?
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197? John Deere 400 H3 Main Winter Machine Down - Fixing odds & ends - 19.9HP Kohler 532- Hydrostatic - 3PT Hitch - Back Blade - Snow Blower - Cab - Weights - Chains
1974 Massey 12G - Backup Machine - Tecumseh 12HP - 4 Speed Variator - 42" Mower Deck - Snow Blower - Tiller - Cab
1996 Sears GT6000 - Backup Machine - Kohler Command 22HP Twin - 6 Speed Hi/Low - 42" Mower Deck - 42" Dual Stage Blower - Brush Guard - ATV Tires - Chains & Weights
1974 John Deere 112
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197? John Deere 112 Electric Lift - Storage - 12HP Kohler K301- 4 Speed Manual - Turf Tires
Past Machines & To-do's - 1974 Snapper LT16 - 1989 Murray GT18/46 - 1970 Massey Ferguson 10 - 2004 John Deere LA100- WIP
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Old 05-28-2012, 05:54 PM   post #4 of 12
rscurtis
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Default Re: Piston Corrosion On HH100

That piston looks OK for re-use, but the rings are worn out. If it does not have an offset wrist pin (indicated by an arrow on the crown indicating a direction of installation), you can turn it around on the rod the wear the other side.
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Old 05-28-2012, 09:58 PM   post #5 of 12
markusedma
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Default Re: Piston Corrosion On HH100

Personally I would not re-use that piston. The crown has alot of erosion. Usually caused by a build up of carbon at the top of the cylinder. Is there a ridge at the top of the cylinder that will grab your finger nail?
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Old 05-29-2012, 01:48 AM   post #6 of 12
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Default Re: Piston Corrosion On HH100

the top ring land is pretty chewed up, I would not reuse it.
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Old 05-29-2012, 09:55 AM   post #7 of 12
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Default Re: Piston Corrosion On HH100

Check the piston ring end gap by placing them in the bore, one at a time, and using the piston backwards to push a little on the ring, square the ring. Measure the gap between the ends of the ring using a feeler gauge. Check against the manufacturer specified range. If within tolerance, pbt. The rings are allowing blowby from the combustion chamber to pressurize the crankcase, causing the oil to get blown out. At higher rpms, the pistons seem to seal better in most cases as there is not enough time for the gas to escape past the rings into the crankcase. You'd see a lot more at idle speeds in most cases.
The top of the piston sure looks clean compared to a lot of the pics you see posted here. From the condition, it is hard to believe this engine is blowing oil. Most times the piston would be covered with 'stuff'. The rod bearing is not perfect, but I have yet to see one that has run for any length of time that IS perfect. What does the crank journal look like?
The scoring of the topmost land is a little more than expected. Was it run low on oil or with the cooling fins clogged with trimmings? If the piston fits into the bore without binding, and doesn't flop around, as in you cannot 'rock' it, then you can put back together and see what happens. If you are doing this for a living, the more profitable and likely success will be found with new parts. If you are on your own time, you can afford to try the old parts. Check to see how sloppy the rings are in the grooves by sticking the ring into the groove 'backwards' and using a feeler gauge to measure clearance between the top or bottom of the ring and the land. There is a spec for that too. If the clearance is too large, the ring will have too much room to flop around, and will not seal properly. I think it will 'flutter' in the groove rather than follow the piston smoothly, leading to poor sealing.
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Old 05-30-2012, 10:21 AM   post #8 of 12
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Default Re: Piston Corrosion On HH100

Ring end gap is above 35 thou, as thats as high as my feeler gauge goes, and its lose in the gap
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197? John Deere 400 H3 Main Winter Machine Down - Fixing odds & ends - 19.9HP Kohler 532- Hydrostatic - 3PT Hitch - Back Blade - Snow Blower - Cab - Weights - Chains
1974 Massey 12G - Backup Machine - Tecumseh 12HP - 4 Speed Variator - 42" Mower Deck - Snow Blower - Tiller - Cab
1996 Sears GT6000 - Backup Machine - Kohler Command 22HP Twin - 6 Speed Hi/Low - 42" Mower Deck - 42" Dual Stage Blower - Brush Guard - ATV Tires - Chains & Weights
1974 John Deere 112
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197? John Deere 112 Electric Lift - Storage - 12HP Kohler K301- 4 Speed Manual - Turf Tires
Past Machines & To-do's - 1974 Snapper LT16 - 1989 Murray GT18/46 - 1970 Massey Ferguson 10 - 2004 John Deere LA100- WIP
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Old 05-30-2012, 01:24 PM   post #9 of 12
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Default Re: Piston Corrosion On HH100

be nice if you had a new set of rings for it to check end gap with again; see if the end gap is tighter in that bore, with a new set....sadly I just scrapped both an HH and a VH 100 like a month ago; the HH was almost certainly rebuildable; the VH I'm guessing would have needed bored out. (ran outta oil seized and freed up by PO.)
this was truly the 1st and only VH series engine that I have ever had; it came on an old (late 70s) Bunton commercial walk behind
I had a fresh, overbored and rebuilt Briggs 12.5 L head I/C sittin here so that's what I put on that mower instead.
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Old 05-30-2012, 02:01 PM   post #10 of 12
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Yikes Re: Piston Corrosion On HH100

Yup- Whipped rings.. Another cause could be a faulty CC breather but not likely due to the looks of the bore.. The cylinder could be ovaled perpendicular to the wrist pin. (axial forces cause the piston to slap and wear in that direction.) The ring in the middle of the cylinder bore concerns me.. I'd try cleaning it up and measuring it as it may be time for a bore job and oversize piston.. Or if you are flipping it re-ring at least.. The piston should be replaced due to the wear too..
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Old 05-30-2012, 08:31 PM   post #11 of 12
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Default Re: Piston Corrosion On HH100

Thanks WNY,

Will be putting her on the shelf for now, got no funds to do that much work sadly
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1996 John Deere 425 Main Summer Machine - 20HP Liquid Cooled Kawasaki - Hydrostatic Twin Pedals - 48" Deck
197? John Deere 400 H3 Main Winter Machine Down - Fixing odds & ends - 19.9HP Kohler 532- Hydrostatic - 3PT Hitch - Back Blade - Snow Blower - Cab - Weights - Chains
1974 Massey 12G - Backup Machine - Tecumseh 12HP - 4 Speed Variator - 42" Mower Deck - Snow Blower - Tiller - Cab
1996 Sears GT6000 - Backup Machine - Kohler Command 22HP Twin - 6 Speed Hi/Low - 42" Mower Deck - 42" Dual Stage Blower - Brush Guard - ATV Tires - Chains & Weights
1974 John Deere 112
(Parts)
197? John Deere 112 Electric Lift - Storage - 12HP Kohler K301- 4 Speed Manual - Turf Tires
Past Machines & To-do's - 1974 Snapper LT16 - 1989 Murray GT18/46 - 1970 Massey Ferguson 10 - 2004 John Deere LA100- WIP
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Old 08-17-2012, 04:09 PM   post #12 of 12
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Default Re: Piston Corrosion On HH100

Greetings gentlemen, I just joined up on the forum, but have been reading for a few months while I am restoring a Sears XL 10 that I got for free. The engine on it has the HH100 sheet metal but turns out itís actually an HH120, I figured that out when I ordered a new standard piston for the HH100, not the same size as mine! Anyways, I ordered the correct piston kit but still have the new HH100 standard piston kit with new rings, piston, wrist pin and clips. If anyone wants it, I would prefer to just give it to someone than to bother sending it back to the company I bought it from and paying a restocking fee. The Kit is a ROT6736 ROTARY AFTERMARKET piston kit from Patís Small Engine.
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