Early 63 PCV

[Timothy B.]

Re: Early 63 PCV

Here is a pic of the sleeve in my spare engine. This is a October 1962 build.

[Bob J.]

Re: Early 63 PCV

This is the grommet style

[Lynn H.]

Re: Early 63 PCV

Lynn, can you post a picture?

Thanks

Here is a fairly good photo where you can clearly see the steel sleeve. I would say this is fairly good proof that this style of grommet was used most of the year, I would think the JG would have it the other way around. My car is fully documented and built on July 10, 1963, with the motor having an assembly date of July 7, 1963.
And Joe,
It doesn't look to be cracked, but certainly appears to have been chuffing a little.
Lynn

[Harry S.]

Re: Early 63 PCV

Lynn and Bob, thanks

[Michael H.]

Re: Early 63 PCV

Lynn and Bob, thanks

It shold also be mentioned that the original grommet and retainer are installed nearly flush with the block surface.

The later design without the sleeve, as shown in Bob Jorjorians picture, uses the flange portion to locate the grommet. The flange rests on TOP of the block surface and is probably at least 1/8" taller or more, and 1/4" larger in diameter.

[Duke W.]

Re: Early 63 PCV

DeGregory is correct. (that's twice, now) A change date in the AIM is NOT the same as the date the item/procedure actually changed on the assembly line.
In some cases, it IS close, but in many/most others, it's not. The actual/physical change on the assy line can be weeks/months after the AIM date.

The actual part change on the line can occur before or after the AIM sheet is released. Changing the AIM was always part of the ECO, and it was often changed sooner than the new part went into production, especially if new tooling was required, which is the case for a molded rubber part.

The other issue is how many old parts are in the pipeline, and they must be produced until the new part is available. What do you do with the old parts - throw them away? Not hardly.

In the case of non-critical parts like this the disposition of old parts is almost always "use until existing stocks are exhausted".

So there may be a period during production when both old an new parts are used interchangeabty. In fact, this was quite common.

Duke

[Michael H.]

Re: Early 63 PCV

The actual part change on the line can occur before or after the AIM sheet is released.

The other issue is how many old parts are in the pipeline, and they must be produced until the new part is available. What do you do with the old parts - throw them away? Not hardly.

In the case of non-critical parts like this the disposition of old parts is almost always "use until existing stocks are exhausted".

So there may be a period during production when both old an new parts are used interchangeabty. In fact, this was quite common.

Duke

In most cases, the AIM showed the change and new part number before the actual change occured on the line.

Many NPC's direct the assy plant to "SCRAP" the replaced part. Others require the replaced parts to be returned to the warehouse while still others instruct the plant to "mix with" an existing part if the assembly procedure is the same and the change was for ease of assembly. (such as our cc tube grommet) In that case, the replaced parts were discontinued from service and the original grommet and retainer would be scrapped. I doubt the early and late design of this particular part were "mixed" in production. Assembly was different and the part number changed.

[Joe L.]

Re: Early 63 PCV

Here is a fairly good photo where you can clearly see the steel sleeve. I would say this is fairly good proof that this style of grommet was used most of the year, I would think the JG would have it the other way around. My car is fully documented and built on July 10, 1963, with the motor having an assembly date of July 7, 1963.
And Joe,
It doesn't look to be cracked, but certainly appears to have been chuffing a little.
Lynn

Lynn------


It's got to be hard as a rock and brittle. The main thing that causes this is engine heat and exposure to oil, both of which this grommet has endured since 1963. It usually doesn't even take 10 years for other PCV grommets to get to the "hard-as-a-rock" stage.

[John D.]

Re: Early 63 PCV

This is the grommet style

Jorjorian, Nice pic. Now put up a pic of the sleeve/grommet that you are sandbagging.

On the other hand it's a tad early. JD

[Joe L.]

Re: Early 63 PCV

Here's an interesting "tidbit": I noticed that the part numbers for the original 1963 PCV grommet and retainer looked quite old. Yet, they were not used on any earlier Corvette. So, I checked them out. It turns out that both were originally used on 1956-57 series 3 cab-over trucks. Then, they were not used again until the 1963 Corvette application. That was the "end-of-the-line" for them. They were both discontinued in the spring of 1964 and replaced by the 3831671.

[Thomas B.]

Re: Early 63 PCV

Anyone found a replacement for this grommet? Only ones I see are later design which require removal of the sleeve.

[Thomas B.]

[Thomas B.]

Re: Early 63 PCV

The first pic on the right is the early grommet with steel sleeve. Found this on an older post on the corvette forum. I haven't found a source for this one at this point.

The second pic on the left is the commonly available later design. Appears to be the correct diameter to fit the hole in the block after the original steel sleeve is removed. Metal tube fits well into the top of the grommet.

The third pic below I believe to be the early grommet installed in my car. Probably the original one. The rubber grommet has hardened and doesn't seal well around the tube. Can dislodge the tube pretty easily.

I'm thinking maybe a slide hammer might be the best option for removing the existing grommet and sleeve. Haven't come across the proper one yet to do the job. Any suggestions would be appreciated.

[Joe L.]

Re: Early 63 PCV

The first pic on the right is the early grommet with steel sleeve. Found this on an older post on the corvette forum. I haven't found a source for this one at this point.

The second pic on the left is the commonly available later design. Appears to be the correct diameter to fit the hole in the block after the original steel sleeve is removed. Metal tube fits well into the top of the grommet.

The third pic below I believe to be the early grommet installed in my car. Probably the original one. The rubber grommet has hardened and doesn't seal well around the tube. Can dislodge the tube pretty easily.

I'm thinking maybe a slide hammer might be the best option for removing the existing grommet and sleeve. Haven't come across the proper one yet to do the job. Any suggestions would be appreciated.

Thomas------

If the original grommet could be fabricated, I do not see why the original sleeve could not be re-used. To fabricate the grommet all that would be required is a piece of the right material of correct thickness and a couple of the right sized arch punches.

[Thomas B.]

Re: Early 63 PCV

Good suggestion Joe. Maybe I can work the rubber grommet out of the sleeve and leave the sleeve in place. Have you seen this early grommet and sleeve out of the engine and verify if the picture I posted is accurate?