Blue smoke... Rings OR Valve Seals??

[F 150Cobra]

Your gong to need to do the leakdown on it..

allright im gonna chek that... any one doesnt suspect the intake gasket???


becuase the plugs are oily but random order.. today i got only 1 and 4 and 7

 

[1985 Ford F-150]

Ya must have some crappy plugs then cause I ran that 390 for better than 6 months on the same set of plugs and it burned a little more than a quart every 60 miles.

 

[1985 Ford F-150]

Whatd ya use to seal the intake gaskets?

 

[F 150Cobra]

Ya must have some crappy plugs then cause I ran that 390 for better than 6 months on the same set of plugs and it burned a little more than a quart every 60 miles.

Whatd ya use to seal the intake gaskets?

damn platinum plugs


RTV

 

[5.0Flareside]

damn platinum plugs

yeah platinum plugs suck.

 

[1985 Ford F-150]

Theres the problem I would foul them stupid platinums left and right but as soon as I got a good set of regular old motorcraft plugs I never fouled one. I also dont trust silicone so it could be leakin from there but it aint likely.

 

[5.0Flareside]

yeah it probably is the silicone gasket. i dont like RTV. and yeah just get regular old motorcraft copper plugs.

 

[1985 Ford F-150]

Motorcraft autolight whatever just get the regular plug and nothin special.

 

[F 150Cobra]

could it be the gasket guys? and im gonna open the valve cover tomorrow how do i see for bad valve seals?

 

[1985 Ford F-150]

I dont think so if ya wanna re do it then go head.

 

[F 150Cobra]

why is it oily in a few intake runners? specially nr 4cyl the one plug i always find with oil! its oily in there but not in the intake itself... i suspect the gasket was leaking.. because

i noticed something today... when cold it does not burn oil .. i drive it a little and give it a few revs let the engine warm up ( its NOT low on power i may add ) and it started smoking.. my money is on the intake gaskets.. ?

 

[1985 Ford F-150]

Well get some good flepro gaskets and this sealant. You can get it at any parts store but Autozone. This stuff is the best sealant ive ever used. It is very sticky and dries in half the time or less than silicone. Its kionda hard to get back off but if ya got a good putty knife or gasket scraper and a wire brush or wheel on a drill or grinder then it comes off fairly easy.

Heres the mini caulking gun that ya use.

 

[F 150Cobra]

i really think its the valve seals!! or the pistons.. arg!!!!

 

[blackhat620]

why is it oily in a few intake runners? specially nr 4cyl the one plug i always find with oil! its oily in there but not in the intake itself...

The oil in the intake runners can be from bad valve guides, cracked head as well.
Did you have the heads Hot-Tanked & Magnafluxed before they were rebuilt?

If the sealing surfaces of the heads and intake manifold are not parallel & flat you can get a leak between the lower edge of the head and intake manifold that will pull vacuum and oil directly from the valley. This leak will not readily show up with external test methods. The heads & manifold should be checked during engine build up.
Have the heads or intake manifold been milled?
Also the manifold could be warped or improperly torqued.

i really think its the valve seals!! or the pistons.. arg!!!!

Have you performed a cylinder leak down test?

 

[F 150Cobra]

The oil in the intake runners can be from bad valve guides, cracked head as well.
Did you have the heads Hot-Tanked & Magnafluxed before they were rebuilt?

nope.. as i say before,, the engine is from ford reman brand new bought we never messed withthem in any way just changed springs and valve seals..

Have you performed a cylinder leak down test?

i dont know how and dont know where ti find a place to do it..

 

[blackhat620]

i dont know how and dont know where ti find a place to do it..

See post # 10 above, i posted links to the leak down test process and places to buy or make a tester.

If you bought a remanufactured long block from Ford, why did you change the valve seals and springs?

 

[95F350XL]

I dont use silcone on any of that stuff. I use permadry gaskets, no need for silicone. When I do the intake gaskets I use permatex high tack. The intake gaskets are really supposed to be put on dry.

And I use a bead of ultra grey to go across the valley.

 

[F 150Cobra]

See post # 10 above, i posted links to the leak down test process and places to buy or make a tester.

If you bought a remanufactured long block from Ford, why did you change the valve seals and springs?

for the performance cam.. it required a double spring application to stop "valve float" at high rpms

 

[F 150Cobra]

I dont use silcone on any of that stuff. I use permadry gaskets, no need for silicone. When I do the intake gaskets I use permatex high tack. The intake gaskets are really supposed to be put on dry.

And I use a bead of ultra grey to go across the valley.

allright i have high tack also im gonna use it there.. but its not the gasket leaking its the valve seals.. im gonna order them monday

 

[NeXtras]

allright i have high tack also im gonna use it there.. but its not the gasket leaking its the valve seals.. im gonna order them monday

stop being stubborn and do the leak-down test!!!

its sensless replaceing the valve seals if your not POSSITIVE its them... one thing ive learned whole working at the shop, diag as much as possible before just throwing parts at it!, saves a lot of hastle