Let's talk about cam slip

Cam sprocket slip, what causes it?

I know some can be caused by install error, not following the service manual, but what about cars that have gone 10's of thousands of miles then just slip?

This seems to be random and mostly blamed on user error on the other forum.

Here's my issues and those of you who follow me on Instagram know what happened.

I have right at 25,000 miles on my built bottom end. Everything was done per the service manual to the letter, new cam bolts and washers, new crank bolt and washers, torque wrench calibrated.

I do drive my car fairly hard with a few 1-6 gear pulls a few times a week and 1-4 pulls daily. I get shift studder 50% of the time on the 1-2 and 20% on the 2-3, rarely on the 3-4 and up.

I was making a pull got some shift studder on the 3-4, not unusual but it's rare, then at 6k the motor shut off.

I get it to the house and yup both cams slipped!! Why??? after 25k would they just slip? Has anyone come up with a reason besides install error?

I would buy that all day long in the 0-5,000 mile range but no way not after 25,000 fairly hard miles.

I'm far from making enough power and I'm not running super stiff springs.

My chain, guides and tentioner are fine. But my spelling sucks.

 

Not sure how the cams can slip; are you sure it wasn't the crank?

 

Positive, I set #1 TDC checked the crank with the plug and the crank trigger, dead nuts on. Both cams were out, on about 90* the intake was out around 60*

 

Bar torque wrench or torque procedure?

No reason at all for it to slip assuming everything was clean, new friction washers used, and properly torqued.

 

Everything was clean,dry and new. Like I said I'll buy the whole "improper install" if it happened in the first few thousand miles but not after almost 3 years and 25 thousand hard miles and countless pulls to 150+ without a hiccup.

Believe me I'd own that shit if it was my fault but this makes no sense.

 

Can`t offer any ideas on why they slipped man, but that`s definitely one of those times you sit back and think "damn, glad it wasn`t the crank pulley", because then you`d have lost the oil pump, too (and we already have a member here who recently had that experience).

Might be worth the couple hundred bucks to have the cams pinned.

 

It's going back together with some 620 lock tight on the sprockets and crank pulley.

Was thinking about using the old washers on the bolt side of the cams, sanding the one side of the washer smooth so it doesn't affect torque readings.

Puzzling for sure because I've heard of this happening before months and years later to people.
[doublepost=1503254382][/doublepost]Little FML update, found what caused my cam slip, good damn oil squirter

 

Jesus. Let me guess, wiseco Pistons?

 

Yes but the squirter was bent to clear, guess not enough

 

25K miles later? Weird.

 

Why would it cause the cam slipping? Plenty of builds eliminated the squirters, with no ill effects.

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Why would someone delete something that provides more lubrication?

 

It's more for cooling the pistons, at least from what I recall. And I don't know. I kept mine, tried bending them (of course they all broke off anyway, they usually do). There was a thread on that other forum. I was of the opinion that sure, they might not be necessary, but they are beneficial, and I'm not sure how deleting them would affect oil pressure elsewhere.

Still, I fail to see how it would lead to the cams slipping like this. Personally I'd dig into it further and look for another root cause.

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They're used for both lubrication and cooling, deleting them has no affect on oil pressure anywhere else. But I do agree I'm not seeing how this would correlate into a cam slipping.

 

Someone had postulated that by capping them off, it would increase oil pressure, or something like that. I can't recall the details.

Search for the original thread, see if it makes any sense to you. I don't know enough to agree or disagree with their findings. That's why I kept mine. Or tried to, anyway lol

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Sure I'd love to check that out. Is it on this forum or the other one? Possibly have a link?

 

The other one. I don't think we're supposed to link those threads, are we?

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I have no clue. I'll try and find it because to completely disagree that it would force oil pressures to go up.

 

Found it, sent a PM. It was Silverdemon who mentioned pressure, so I'd take a look.

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So what torque wrench did you use?