VAlve replacement

Carnie chick · Veteran Member

VAlve replacement

2drpost · Uber Guru

no, cyl head has to come off to replace valves

valve LIFTERS can be changed w/o removing the heads

68 427 · Poncho Master!

IT MAY BE POSSIBLE, I DON'T KNOW OF ANYBODY THAT HAS, OR WOULD TRY TO DO IT THAT WAY. THE VALVES INSTALL FROM THE BOTTOM OF THE HEAD. IT IS MUCH EASIER TO JUST REMOVE THE HEADS. OTHERWISE YOU WOULD HAVE TO REMOVE THE OIL-PAN, REMOVE THE CRANK, REMOVE THE PISTONS..... SAVE YOURSELF THE TROUBLE, JUST REMOVE THE HEADS, IT WILL BE ALOT QUICKER AND EASIER.

Canadian Poncho · A Poncho Legend!

Is it a valve you need to replace or valve seals? Seals can be replaced without removing the head if you use compressed air in the cylinder to hold the valve in place.

beaumontguru · Canadian Poncho Superstar!

I think that is what you meant? valve seals.

They can be done on the head. Compressed air into the cylinder to hold the valve up, many styles of spring compressors avail, i like the prybar style that is avail from pistonring service. Easy to do, can be done in about 1 hour in the driveway, just by removing the valvecover and spark plugs,

When doing, upgrade to double seals, get umbrella seals Felpro # 10058 as well as the stock o-ring kind.

64 Hard Top · Addicted!

If it's seals that you're doing,....

There's two methods. One with compressed air,.. which I've done. My rings and valve seats were a bit worn and I only had a 3/4 compressor. I could hear air going past the rings and valves and the comporessor had quite a time keeping up with the loss of air. Changing them fast enough was like doing valve stem seals in pitts of the Indy 500,... for fear the valves might drop in the cylinder. But,.. it did the job.

There's another method I've heard from "old timers" which I 've never tried. Take out all the plugs, then carefully thread a 1/4" cotton rope into 1 chamber at a time,..till it is "full". (keeping one end of the rope out of course) Then manually turn your crankshaft untill you feel the firm pressure of the piston against the rope pushing on the valves. Then you can take your time,.. change the seal, re-assemble spring and keepers,... and pull out the rope as you do the others. I've always wanted to try this method but never have.

Anyone other there tried the rope method? (and don't worry,.. you won't be labelled "old timer

-- Edited by 64 Hard Top on Thursday 26th of April 2012 06:49:40 PM

timbuk · Canadian Poncho Superstar!

i heard you need to shove 20 feet of rope in there!

4SPEED427 · A Poncho Legend!

The rope method works fine.

Beaumont4008 · Uber Guru

Yes I have used the rope method myself. Works like Carl says , just fine.

Carnie chick · Veteran Member

It's the actual valve that needs replacing it's got a big chip in it. Have to do push rod and rocker too

Canadian Poncho · A Poncho Legend!

In that case the head needs to be removed. You'll also need to determine what caused the chip.

Carnie chick · Veteran Member

Ok. Thank you everyone!

64 Hard Top · Addicted!

not to discourage ,... but,.....

Been there too,...

If a valve needs to be replaced in an engine with higher milage,.... it's likely that it won't end with a simple valve replacement. When you pull the head,.. you really should do both heads ,.... you'll be likely to grind the seats,... guides,.. resurface. And then you'll start mosquito fogging because the top end is nice and tight,... you'll be pushing oil past the rings which are worn.

Unless you've got a solid miss ,.. drive it and enjoy the summer!

Carnie chick · Veteran Member

When we bought it the man said it did misfire. It's got 65000 original miles

Ahnuld · Addicted!

Carnie chick wrote:
It's the actual valve that needs replacing it's got a big chip in it. Have to do push rod and rocker too

who said it has a chip on the valve, they would have too have taken the head off to see it. then after seeing it they bolted it back on. if they didn't do this then the problem could be anything like a broken piston. wait till everythings apart instead of guessing. this is just my opinion though. Dan

4SPEED427 · A Poncho Legend!

I was wondering if they used a boroscope to look in their maybe. I had the same thought Dan.

Often a "chip" off a valve means a burned valve.

Carnie chick · Veteran Member

It might not be valve then. When I took the valve cover off there was a chip in the metal piece that the rocker is supposed to be against. Push rod was broken too. When I showed the guy at parts store a pic and told him it was the one at front he called it rhe exhaust valve

Ahnuld · Addicted!

there could definitely be alot more wrong than a simple valve then. the list could be long. hope for the best though. Dan

4SPEED427 · A Poncho Legend!

It sounds like you need to pull that head. Is this engine fresh or is it an older original?

dualquadpete · Canadian Poncho Superstar!

In my 'past " experience, once you do the top end up & give it some "compression' if the rings are 'weak' or "bottom end" [connecting rod brgs. & main brgs] then your going to have to do the bottom end shortly anyways,as it will start to burn oil or "rap"!!!! You may get lucky OR?????

4SPEED427 · A Poncho Legend!

dualquadpete wrote:
In my 'past " experience, once you do the top end up & give it some "compression' if the rings are 'weak' or "bottom end" [connecting rod brgs. & main brgs] then your going to have to do the bottom end shortly anyways,as it will start to burn oil or "rap"!!!! You may get lucky OR?????

Exactly. That story is all too common. It doesn't save any money in the end.

Carnie chick · Veteran Member

It's the original engine. Cross your fingers fOr me!

timbuk · Canadian Poncho Superstar!

its got prettty low miles how do you know the valve has a chip? through the exhaust port?As Pete says do the top alone is hard on bottom. only 65k miles if valve has chip i would consider putting in new valve only and a set of valve seals and drive.

Carnie chick · Veteran Member

I took off the valve cover and the rocker was off to the side. There was a chip missing off the metal piece under where the rocker is supposed to be. The push rod was also bent. I was tol the chipped piece I saw was the valve. I can't upload a photo for some Reason or I'd post it

timbuk · Canadian Poncho Superstar!

ok its chipped up top! i would guess that thing was overrevved if the pushrod bent or the lifter failed.Rollin dice if you put back together,maybe yes maybe no. cant get pic on?