valve stem damage
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Posting Guru
Joined: Jan 2004
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Crap i totally forgot about this. I'm going to go get breakfast and come back and post pics immediately. And I know I look like a complete tool right now but I won't have girl pictures until tonight
Yesterday didn't go completely as planned, it went great, but I forgot the camera. Feel free to tear me apart until I do
Timmy
Yesterday didn't go completely as planned, it went great, but I forgot the camera. Feel free to tear me apart until I doTimmy
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Man, that looks like bogus metal or pot metal to me. Since I cannot see them corroding, looks like a bad batch to me. I'll be curious to hear what the pros say. I say manufacturing defect in the valve.
Senior User
Joined: Dec 2006
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From: Wake Forest, NC
Ok not suggesting anything here just an observation based on previous experience. The last time I saw something that even resembled this was on a 289 in a mustang. The owner a friend of mine would on "occasion" have a tendency to over rev the engine and this resulted.. we suspected due to a kind of valve float which did the same type of damage to the top of some of the valve stems. Again this is speculation on my part. l'm also waiting for the verdict to come in..
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Postmaster
Joined: Nov 2003
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From: Utah County, UT
I agree, looks like a bad batch or some type of impurities built up at the top. Will be interesting to see what others think as well. Does anyone know if these are cast then machined or simply machined from stock? If they are cast I can see it happening in a cold mold.
Lead Driver
Joined: Oct 2004
Posts: 7,413
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From: Columbia, MO
Tim, my enginge guy took one look at those, and without hesitation said, "No oil. The top end is not getting lubrication." I told him they're hydraulic lifters though, so how could this happen, since the truck was running and valves still operation. He said that the lifters could be bleeding down. There's enough pressure to let the mechanism still work and valves still open, but not enough to send oil up through the pushtube(rod) and up to the top end.
So that's what I've got on my end. I'd check the oil pressure with an actual gauge. If that checks out, start thinking lifters. I'm thinking it might be a lifter anyway, since there were only two valves that looked like that.
So that's what I've got on my end. I'd check the oil pressure with an actual gauge. If that checks out, start thinking lifters. I'm thinking it might be a lifter anyway, since there were only two valves that looked like that.
Elder User
Joined: Oct 2005
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From: Reno nv
the stem surfaces have a galling condition, but cause is kind a hard to get to. Looks like you had a severe surface wear problem that blew through the hardened skin coat caused by impact. I suspect the lifters letting a gap occur then banging the valve stem to fracture the coating (not the right word, really long day)
hope the rockers looked OK with no mushrooming or galling either. check the pushrods for oil flow and end deformity
BTW galling is identical to cold wet working concrete resulting in "spalling" for those in the trades
my $.02 your mileage can and will vary
hope the rockers looked OK with no mushrooming or galling either. check the pushrods for oil flow and end deformity
BTW galling is identical to cold wet working concrete resulting in "spalling" for those in the trades
my $.02 your mileage can and will vary
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Posting Guru
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rockers all looked the same. i checked that. They all had a shiny surface where they contact the valve. I'm just curious if it is an oil problem why there wouldn't be any marks on the rocker. I'm just flat out surprised there are no marks on the rocker.
Timmy
Timmy
Post Fiend
Joined: Feb 2006
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From: Middle Tennessee
Well I am learning something here I guess, galling/spalling. That metal on those valve stems looks like poop to me. Poured porous poop. Maybe they all look like that under the shiny exterior, IDK.
As for corrosion, I say it is still out as the CCV vapors keep enough oil there to "mist" them.
What kind of metal are the valves made of, polished pot metal poo?
As for corrosion, I say it is still out as the CCV vapors keep enough oil there to "mist" them.
What kind of metal are the valves made of, polished pot metal poo?
Post Fiend
Joined: Jul 2005
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From: 21791
I was thinking about it, and came to this conclusion. Here's my prior knowledge, tell me if i am wrong. The lifter is pressurized, oil comes up through the center of the hollow push rod, only to lubricate the end of the rocker arm that it contacts. The oil does not go through the rocker itself to lubricate the business end of the rocker that pushes on the valve. There should always be some oil splashing and misting around, but not up near the top of the valve. Does that part not get pressure lubrication?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
I was thinking about it, and came to this conclusion. Here's my prior knowledge, tell me if i am wrong. The lifter is pressurized, oil comes up through the center of the hollow push rod, only to lubricate the end of the rocker arm that it contacts. The oil does not go through the rocker itself to lubricate the business end of the rocker that pushes on the valve. There should always be some oil splashing and misting around, but not up near the top of the valve. Does that part not get pressure lubrication?
I cannot think of a single engine design that provides pressure lube to the end of the rocker where it contacts the valve.
To the valve adjuster itself, but not to the end where it makes contact.