Installed 1.7 roller rockers and started to smoke out of the exhaust

joey308 · 07-22-2006

Hey guys. Well i installed a new set of crane 1.7 roller rockers on my 89 5.0 mustang and when i started it up there was smoke coming out of my exhaust.It never did that before i installed them.Then i took it for a 5 min drive to see if it would go away but there was still smoke coming out.Not alot but you could see it coming out.It was blowing blue smoke not black.If anybody can help that would be great.Thanks joey

GhostDog 5.0 · 07-22-2006

Are these stud or pedestal mount?

**tripleblack** · 07-22-2006

Is that all you did - change to 1.7 rockers?

If so, sounds like you might need to check that they were at zero (plus a 90 degree turn, I think). Check your directions (or lacking those, with the manufacturer). I'm working from memory, so not 100% sure, but I suspect you're not getting full action working.

Also, I can see where GhostDog might be going, depending on what the answer to his question is.

Could also be that you messed up your EGR hookup or left off some vacuum hose - check those first, of course.

Quote:

Originally Posted by joey308

Hey guys. Well i installed a new set of crane 1.7 roller rockers on my 89 5.0 mustang and when i started it up there was smoke coming out of my exhaust.It never did that before i installed them.Then i took it for a 5 min drive to see if it would go away but there was still smoke coming out.Not alot but you could see it coming out.It was blowing blue smoke not black.If anybody can help that would be great.Thanks joey

**tripleblack** · 07-22-2006

The more I think about it, the more likely it seems to me you have some Cobra Pedestal Mount rockers. You have to use shims with these. There's a method to it (I won't try to disgorge it all from memory - probably get it wrong anyway). You can find it on sites like Comp Cams under the faq's.

joey308 · 07-22-2006

they are pedestal mount and i think they are cobra ones

**tripleblack** · 07-22-2006

Quote:

Originally Posted by joey308

they are pedestal mount and i think they are cobra ones

Were they new?

At any rate, did you use shims?

What process did you go through?

joey308 · 07-22-2006

they were not new got them from my uncle.Did not use shims because when i first put them on they were too loose so i had the pedestals machined.So im thinking that they were machined wrong and when i bolt them down they open the valves but they are surpose to be closed. I think i should put my stock ones back on.

**tripleblack** · 07-22-2006

Quote:

Originally Posted by joey308

they were not new got them from my uncle.Did not use shims because when i first put them on they were too loose so i had the pedestals machined.So im thinking that they were machined wrong and when i bolt them down they open the valves but they are surpose to be closed. I think i should put my stock ones back on.

Depending on how they were machined, you may find that your old ones won't work properly, either.

Go to Comp Cams and find their instructions. They have pics, if memory serves - see if they look like what the shop did to yours.

You should discuss this with the machine shop - if they're any good, they'll help you figure out your problem.