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Bad Lifter and Carbon On Valves After 2000 Miles??
#1339563
11/22/12 06:35 PM
11/22/12 06:35 PM
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Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
bobs66440
OP
top fuel
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OP
top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
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Happy Thanksgiving Everyone! I had a lifter bleeding down over night on my fresh rebuild, so I yanked the intake and found the offending lifter. It is VERY easy to push down, probably 1/4", while the lifter is on the base of the lobe. That one is obviously bad. The thing is, there are two more on the same side that I can push down, maybe 1/16". All the others are rock hard. No movement at all. Is this normal, or are they getting ready to fail also? I pulled the plugs and they look fine. Some are light brown, Some look almost unused...   Also, looking in the intake ports I see some oily carbon deposits on the valves. It sure seems like a lot for only having 2000 miles on a fresh rebuild with new Stealth heads. Are the seals gone or is some buildup normal??  
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Re: Bad Lifter and Carbon On Valves After 2000 Miles??
[Re: bobs66440]
#1339564
11/22/12 09:52 PM
11/22/12 09:52 PM
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Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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Bad lifters = ticking noise
Bad valve stem seals = major carbon/
build up like you have.
You know what to fix.. oil
I am truckless..
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Re: Bad Lifter and Carbon On Valves After 2000 Miles??
[Re: RapidRobert]
#1339567
11/22/12 11:43 PM
11/22/12 11:43 PM
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Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
bobs66440
OP
top fuel
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OP
top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
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Quote:
Quote:
Also, looking in the intake ports I see some oily carbon deposits on the valves. It sure seems like a lot for only having 2000 miles on a fresh rebuild
Oil might be getting pulled in thru the lower edge of the valley pan metal gasket up into 1 or more of the intake ports. Improper ring breakin could also be a culprit. Read "breakin secrets" (5 minute read) at www.mototuneusa.com for more info on that subject
I had the problem of oil seeping through the intake gasket once before, so when I built the motor I made sure it was well sealed. When I pulled it apart, there was no evidence of seepage so I think it was ok.
Regarding the ring break-in, I'm not sure how that would cause carbon on the valves. The plugs look real good, there is no blow-by and virtually no oil usage.
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Re: Bad Lifter and Carbon On Valves After 2000 Miles??
[Re: bobs66440]
#1339568
11/23/12 06:07 AM
11/23/12 06:07 AM
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Joined: Dec 2010
Posts: 208
Norrland, Sweden
Swedcharger67
enthusiast
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enthusiast
Joined: Dec 2010
Posts: 208
Norrland, Sweden
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Could the cam overlap be contributing to the deposits?
Martin, 67 Charger, 512 cui, E85, MegaSquirt MS3X sequential ignition & injection
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