New cams to install. Replace rockers too?

[jlado13]

Okay dammit, I'm convinced... I think I'm going to go ahead and get the cams now since the head will be apart. Think I'm gonna go with the 264/272 combo. However, is it absolutely necessary to replace the rockers with the cams? Or can I use the ones already in my head?

 

[cruisintalonawd]

Do the still spin freely

 

[1gcrazy]

If they were working before no need to change them.

 

[jlado13]

Huh? Do theY spin freely? I would have to say yes. I just didn't know if new cams should "wear in" to new rockers.

 

[1gcrazy]

Nah, rockers aren't really a wear item... i mean they wear down but not like piston rings or bearings.

 

[acexxxoasis]

I always thought you were supposed to change them whenever you changed cams but I think thats more for solid lifters and V8s and such. but thanks for asking I had the same question as Im rebuiding my engine also

 

[Defiant]

Roller followers tend to last as long as they're fed clean oil.

 

[TunaTalon]

Roller followers tend to last as long as they're fed clean oil.

The Roller Followers (rockers) on my Talon showed zero signs of wear after 183,000 miles bathed in Mobile One. I reused them.

 

[jlado13]

Alrighty then, thanks for the help guys. Just ordered some fp2's. Car goes into the shop this Tuesday for valvejob/head decking. I'll post back once I get them in.

 

[kmoore]

Do the still spin freely

...WTF

 

[cruisintalonawd]

If you hold the side and spin the roller

 

[kenamond]

If you haven't already, I'd install revised lash adjusters (lifters) while you're at it. Super simple with the cams out.

 

[TunaTalon]

If you haven't already, I'd install revised lash adjusters (lifters) while you're at it. Super simple with the cams out.

Amen to that. After 183,000 miles my lifters showed zero signs of wear but I replaced them anyway and trashed them with extreme prejudice. I was really tired of my Mustang driving friend’s smirk as I fired the talon up after work.

 

[jlado13]

Okay, well I got the head off and it's obvious the valves on the #3 cylinder aren't sealing all the way. I noticed that one of the lifters on this cylinder is slightly sitting higher than the other ones. I mean 1mm or less. Not sure if this could cause my problem.. Anyways, I got some revised lifters and the head goes into the machine shop on monday. I just can't wait to get this thing on the road.

 

[Defiant]

Okay, well I got the head off and it's obvious the valves on the #3 cylinder aren't sealing all the way.

Did you turn the head over, close the valves and pour in kerosene? If you didn't do this or a similar leak test, it's not obvious. The height of the valves isn't an indication of their sealing condition.

 

[jlado13]

The height of the valves isn't an indication of their sealing condition.

But aren't they all supposed to be "closed" when your cam timing marks are lined up? I thought they were, but then again, I am here seeking your knowledge and advice.
Thanks

 

[Spln_Hrd]

The only time all of your valves will be closed is with your camshafts removed. When you marks are on tdc that is for #1, the closest cylinder to the timing cover.

Just think though when #1 is at tdc #4 is just finishing the exhaust stroke and getting ready to start the intake stroke so your intake and exhaust will both be open slightly.

also #3 just finish combustion so the exhaust is about to open and #2 just finished intake so the intake is about to close.

 

[peypey's ride]

If the heads off and the cams are still on the head. Cylinders 1,4's valves will be open slightly because of the cams. You can remove the cams, then use kerosene in each to check for leaks. I say remove the cams cause its easier and faster to check cause you can do all the intake at the same time, then the exhaust all at the same time too.

+1(beat me to it, )

 

[jlado13]

Okay, cool thanks. I'm still learning, obviously. I get the head back day after tomorrow. A machine shop is doing all the work and checking it out. Everything will be new, except the roller followers. I went ahead and threw some revised lifters in there too. I'm just trying to learn as I go. Thanks.