wiped cam lobe - 460 Ford Forum
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post #1 of 12 (permalink) Old 03-12-2017, 12:28 PM Thread Starter
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wiped cam lobe

hey guys. I have been running my 460 for about a year now and the other day I saw the vacuum guage bounce around a bit then returned fairly steady. I ran it next day and it developed a tick. I pulled the intake off and the lifter is fried. I wiped a lobe on the motor before this one so was extra cautious at break-in(I pulled the inner valve springs, used high zinc oil and followed the instructions to a T.) I know I have to pull motor and clean it all out but my question is what could have caused this? This was a comp cams X4262H-11 with their recommended lifters. What can I do to avoid this happening again?
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post #2 of 12 (permalink) Old 03-12-2017, 12:54 PM
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How many total miles did you get on the motor since the break in?

If it is a significant number of miles I don't think it would have been the break in process. "From experience myself" a cam lobe failure due to a bad break in happens quickly. You don't get a years worth of driving out of it unless you only went 8 miles that year. I'm thinking a different issue caused this failure. Lets see what the experts say.

Did you change the oil after break in to get rid of all the break in additives & potential crap?

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post #3 of 12 (permalink) Old 03-12-2017, 01:37 PM Thread Starter
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Ya I changed the oil after break in. I have probably around 2500 miles on it (conservative guess). I am confidant I got through the break-in process ok. My oil pressure was always 40 or so at idle and 75 or so off-idle and up. The lifter bores still look ok and the outside of lifter looks normal and it was spinning freely in its bore.
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post #4 of 12 (permalink) Old 03-12-2017, 03:45 PM
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Cool

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Ya I changed the oil after break in. I have probably around 2500 miles on it (conservative guess). I am confidant I got through the break-in process ok. My oil pressure was always 40 or so at idle and 75 or so off-idle and up. The lifter bores still look ok and the outside of lifter looks normal and it was spinning freely in its bore.

What kind of oil were you using after break in?



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post #5 of 12 (permalink) Old 03-12-2017, 07:00 PM Thread Starter
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I used Joe Gibbs at break in and their HR oil afterwards. The last 2 quarts I put in were valvolines VR1 which was what the closest store had.
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post #6 of 12 (permalink) Old 03-12-2017, 07:22 PM
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Cool

Did you use a proper assembly paste on both the lobes and lifter crowns?
The red glop comp provides is inadequate imo.
Did the engine start quickly?

We use joe gibbs assembly grease, BR oil and grind our cams locally using notched johnson lifters and have 0 problems.

Plenty of spring retainer to guide seal clearance?
Spring pressures seat and open?



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post #7 of 12 (permalink) Old 03-12-2017, 10:23 PM Thread Starter
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I used the Joe Gibbs assembly grease on the camshaft and lifters. The engine started quickly but I had to turn it off and adjust distributor but I was quick about it and resumed the break in. I did prime the engine as well. Not sure what the retainer to guide seal clearance is exactly but by just looking at it there appears to be a lot. The springs are 100-135 on the seat and 250-300 open. I am in the market for new cam and lifters. I just want to make sure it doesnt happen again.
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post #8 of 12 (permalink) Old 03-13-2017, 01:16 AM
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I used the Joe Gibbs assembly grease on the camshaft and lifters. The engine started quickly but I had to turn it off and adjust distributor but I was quick about it and resumed the break in. I did prime the engine as well. Not sure what the retainer to guide seal clearance is exactly but by just looking at it there appears to be a lot. The springs are 100-135 on the seat and 250-300 open. I am in the market for new cam and lifters. I just want to make sure it doesnt happen again.

This is likely something to do with lifter hardness. This isn't the first time I've heard this. The slow failure should have allowed the oil filter to trap a good portion of the debris.
Which lifter failed? Did the corresponding lobe fail as well?
Were all lifters free in the lifter bores? Were any excessively loose?

The reason we use notched lifters is to oil from the top down just as GM did to address the issues with lack of splash on the 2.8 engines. This significantly lowers rate of failure due to today's softer cam cores and lifters.



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post #9 of 12 (permalink) Old 03-13-2017, 09:26 PM Thread Starter
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It was cylinder #3 exhaust and the lobe from what I can see is pretty worn. I haven't pulled the engine yet so kind of hard to see. I made sure all the lifter bores were cleaned very well. I made sure all the lifters spun freely. I just slipped another lifter in the bore that the bad lifter came out of and it fit nicely. It Spun nice and free and wasn't excessively loose or anything. Anyways, Like I said I am in the market for cam and lifters if you want to sell me one :-)
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post #10 of 12 (permalink) Old 03-15-2017, 08:26 AM
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Well, you've got the wrong cam! I searched the number you posted and it keeps coming up as a small block Chevy! lol.
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post #11 of 12 (permalink) Old 03-19-2017, 07:28 PM Thread Starter
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The number I posted was the grind number. The actual part # is 34-235-4
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post #12 of 12 (permalink) Old 03-20-2017, 08:21 PM
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Just kiddin' around, Bill. That number did come up as a small Chevy though.
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