Re: cam on it's way out?
[Re: lewtot184]
#1716827
12/28/14 02:41 PM
12/28/14 02:41 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Posts: 14,889
up yours
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I get the impression the OP doesn't know, or hasn't remembered, that lifters do not ride square on the lobe. The lobe is ground at a slight angle looking at it from the side and the lifter rides on the high side of the lobe. This promotes lifter rotation and minimizes wear.
IOW, the wear on the lifter bottom should be circular with the center not worn and the lobe should look worn off center (that's the high side of the lobe.
Your stuff looks normal. Your lifter should not have a flat bottom, it should be slightly domed and if you put two lifters together, bottom to bottom you should see the dome and they should rock, if not they are too worn.
None of the above is relevant to roller lifters and cams, just flat tappet stuff.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: cam on it's way out?
[Re: Supercuda]
#1716828
12/28/14 05:57 PM
12/28/14 05:57 PM
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Joined: Apr 2005
Posts: 207 kauai
maxi333
OP
enthusiast
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OP
enthusiast
Joined: Apr 2005
Posts: 207
kauai
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thanks for the responses all oh deem that's scary... the cam and lifters only have about 200 miles on them??? this was a rebuilt motor that sat for years before break-in. had a friend told me to just prime it and break it in, had a feeling we should have torn it apart for re-lube how can i tell if a cam is blue? still a bit of a newbie in the whole cam lifter but thought there was a raised portion on the lifter and cam... was worried about that pitting in the center being the area that made contact with the cam but now i see the worn circular area around the pitting. i did purchase new lifters after not being able to adjust ticking out. although after some responses questioning whether it was lifter problems in the first place, thought i should look into the cam area incase it was on it's way out and catch it before needing an entire rebuild. but wow a 200 mile cam/lifter setup looking like it has 100k miles on it can't be good. will the cam fall apart with the new lifters?
1962 Chrysler 300 convertible 383/727 1970 Dodge A108 Boogie Van 318/727
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Re: cam on it's way out?
[Re: lewtot184]
#1716830
12/29/14 07:45 PM
12/29/14 07:45 PM
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Joined: Apr 2005
Posts: 207 kauai
maxi333
OP
enthusiast
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OP
enthusiast
Joined: Apr 2005
Posts: 207
kauai
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thanks for the info wow the builder charged me for new lifters and cam, even supplied the cam card. now i'm worried what else he charged me for and didn't replace. with the ticking in the valve train i guess the best bet is to go with the new lifters and cam? oh and is that an excessive level of metal in the oil filter?
Last edited by nothingman; 12/29/14 07:53 PM.
1962 Chrysler 300 convertible 383/727 1970 Dodge A108 Boogie Van 318/727
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Re: cam on it's way out?
[Re: maxi333]
#1716832
12/29/14 08:30 PM
12/29/14 08:30 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
thanks for the info wow the builder charged me for new lifters and cam, even supplied the cam card. now i'm worried what else he charged me for and didn't replace. with the ticking in the valve train i guess the best bet is to go with the new lifters and cam? oh and is that an excessive level of metal in the oil filter?
run a magnet across the filter media. just looks like carbon to me,...?
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Re: cam on it's way out?
[Re: maxi333]
#1716833
12/29/14 09:22 PM
12/29/14 09:22 PM
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Joined: Jan 2003
Posts: 12,233 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,233
Benton, IL.
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The blueing on that one cam lobe is something I haven't seen before. Does it cause anyone else concern? The lifters are typical of today's crap with the casting pits. I think the die is cast on this combo; if it is gonna die, is is far enough along that not much will save it. But it is hard to tell at this point if it is gonna live or not. A suggestion here though; take a white marker and mark the top lip of each lifter and replace each one back where it came from. Install the push rods and rockers. Then spin the engine over and watch the lifters to make sure they ALL rotate at least some. Any one that does not rotate, will not live long.
Master, again and still
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Re: cam on it's way out?
[Re: DaveRS23]
#1716834
12/29/14 09:29 PM
12/29/14 09:29 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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If one isn't rotating you won't have that circular wear pattern on the bottom.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: cam on it's way out?
[Re: Supercuda]
#1716838
12/29/14 11:04 PM
12/29/14 11:04 PM
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Joined: May 2006
Posts: 2,046 ky.
kenworth_goose
top fuel
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top fuel
Joined: May 2006
Posts: 2,046
ky.
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Quote:
If one isn't rotating you won't have that circular wear pattern on the bottom.
Those lifters won't rotate when they have too much preload. That's why I run all of mine with zero preload.
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Re: cam on it's way out?
[Re: kenworth_goose]
#1716839
12/29/14 11:18 PM
12/29/14 11:18 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
Quote:
If one isn't rotating you won't have that circular wear pattern on the bottom.
Those lifters won't rotate when they have too much preload. That's why I run all of mine with zero preload.
tappets will rotate with a lot of preload. rotation is a factor of the taper on the lobe not preload.
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