Re: Oil in injector housing?
 

Easy on the Mr.!

I wasn't able to get to a set of 90, 1st design injector housings to measure the washer/baffle hole diameter. However, I did measure the hole diameter in the cylinder heads for 91-95 models, at 7/32" drill. If your's are already drilled @ 1/4", i wouldn't re-do them, but i sure would not go any bigger.

If 7/32" is good for the 91~95, it should be good for the baffle washer too.

How about a photo or two of your fix in progress & the end result for "Mr" Dynomite & me?

Re: Oil in injector housing?
 

I was being the little kid who was in trouble asking the adult for another favor!

Any who here goes nothing....yea, I'm going to try to do this with pictures. Just in case I screw it all up here is the link to my photobucket album!!!
http://s215.photobucket.com/albums/cc123/tomZR1/

tools
http://i215.photobucket.com/albums/c...0config012.jpg

http://i215.photobucket.com/albums/c...0config001.jpg

Reshaping the freeze plug.
http://i215.photobucket.com/albums/c...0config003.jpg

Initial install.
http://i215.photobucket.com/albums/c...0config006.jpg

I think I'll post this to see if I screwed it up! oh, the drilled holes are 1/4", but I may go a bit bigger?

Re: Oil in injector housing?
 

Darn....I'm amazed that I got it to work!

This is how I started to install the reshaped plug with the flat bar.
http://i215.photobucket.com/albums/c...0config006.jpg


Then I used my other precision tools to recess the plug a la the OEM install. You can see the one on the right is dunn, middle in progress and the left is what the flat bar does.
http://i215.photobucket.com/albums/c...0config023.jpg

Then it is supposed to come out looking like this, with a slight recess just like the factory did the real ones!
http://i215.photobucket.com/albums/c...0config026.jpg

Re: Oil in injector housing?
 

Thanks for the pictures Tom

Jim

Re: Oil in injector housing?
 

That is correct

It's there, you just can't see it in your photo. All 3 holes are open in the cylinder head.

Re: Oil in injector housing?
 

That Ball peen hammer has sentimental attachment for me.... :mrgreen:

Anyway not that it isn't fairly obvious, the object is to get the freeze plugs flat enough so you get them to be a tight fit in the large CCV holes in the late model I/H's. These are 91 I/H's.

I used the flat bar & my mini-anvil to take some of the dish out of the plug. You play it by ear, if you go too far I used the ball hammer to reform the cup.

Then I positioned the newly shaped plug over the CCV holes and tapped the bar till the plug is flush all around. Next the socket to get that factory recess look. Don't worry if you knock it thru as you can get them back out and try again. The smaller drifts I used to massage the install! :neutral: to achieve that OEM look....well at least one of them came out that way! :sign10:

The reason that I did all three per side with a 1/4" hole drilled thru them was Jerry posted up that the CCV holes in the head had all three drilled holes. I figure it can't hurt. I have a catch can so I'll mind the amount of oil it catches, which is not much now with stock 90 I/H's on stock 90 heads. Maybe we need more discussion on that fine point? I don't have much to contribute to a discussion on that level.

Anyway, that's the long & the short of it.
:cheers:
Tom

Re: Oil in injector housing?
 

Schlitz beer bottles caps work too....just pop a hole in it with the corkscrew on the bottle opener.

Re: Oil in injector housing?
 

Midwest beer, for all non FBI's

Re: Oil in injector housing?
 

Not sure it can be called beer. LOL

Re: Oil in injector housing?
 

My employees got me a 6 pack as a joke.....honestly its pretty damn good..I was surprised....1960s formula...I think I would buy it again.


Wheres the Fallstaff?

Re: Oil in injector housing?
 

Just as a fwiw....I just got a digital slide ruler/caliper thingy...I know why didn't I have one in the first place! :o :p

26.5mm is the size of the holes for the CCV system in the 91 I/H'ings.


I was going to try a Sam Adams cap, but I didn't have any.

Re: Oil in injector housing?
 

and the freeze plug you got (1-1-32) was 26.19mm and the 1-1/16 is basically 27mm (26.987mm)

Re: Oil in injector housing?
 

ordered my freeze plugs, I figured since I had to remove the Plenum anyway for something else, what is a few more bolts

Re: Oil in injector housing?
 

Re: Oil in injector housing?
 

Is that actually possible? The oil from our own PCV system causes our NOx emissions to be high? I'm not trying to be a wise guy...I admit that I don't know what effects all of our PCV blow by does to our emissions test results.

Which catch can did you get?

:cheers:
Tom

Re: Oil in injector housing?
 

The pcv system is one the possible causes of high N0x. If it is not working properly or if the system is allowing oil to enter the intake manifold, according to recommended troubleshooting, it can cause high N0x. The catch can I am installing I bought on ebay, if it works and the N0x comes down, I will post results.

Re: Oil in injector housing?
 

Well I finally pulled my IH off tonight for add the baffles, guess what the 550-013 ( 1-1/32") are too big

I measure the holes and they are close to .953" which is 61/64"

31/32 will be too big and 15/16 is too small, but dorman 550-011 will work like the ones you used Tom. guess I need to go find them tomorrow or something close..

I also had an email conversation with Greg Van Deventer, he said, duplicate the 90 exactly, 2 holes per side, both should be 6.6mm DIA ( just over 1/4")

so that is what I will do as soon as I find plugs

Re: Oil in injector housing?
 

I guess I will go rework mine then and pull out the plugs with the extra holes.

Thanks for the info from Mr. Van Deventer!

:cheers:

Re: Oil in injector housing?
 

I never asked why only 2 holes.. you might get a small amount of oil, he did say he was not directly involved with the 1990 PCV but was when they redesigned in 1991

Re: Oil in injector housing?
 

You know Jeff, maybe we can do an experiment since we both have 90 heads. I'll install mine they way I did them with the three holes and you do yours the right way and we can compare the volume of oil that ends up in our catch cans. Maybe that will tell us something?

:cheers:
Tom

Re: Oil in injector housing?
 

did you ever do up a catch-can? I'm about "this close" to buying something and making a double-T hose connection for the PCV's and running though a can (eliminating the hard-pipe). There's a million and one catch-cans on ebay and I was wondering if you did your yet.

Re: Oil in injector housing?
 

it might, but the can was not catching everything I don't think.. plenum and IH had more oil then I thought when I pulled it apart..

Searched a bunch of parts stores today, nobody had the 550-011 I needed, so I used the 550-013 and ground them smaller on the grinder.. added the holes and they worked good.. hoping to start the reinstall later tonight.

Re: Oil in injector housing?
 

My ebay catch can was not removing all the oil coming through the pcv system as evidenced by oil traces in the hose at the connection to the plenum. I bought a water seperator for air compressors from Loews, modified it slightly and it seems to keep all oil out of the plenum. I passed CA emissions testing w/the oil catch system and using thermo wrap on my headers and CATS.

Re: Oil in injector housing?
 

If you have the smaller diameter(alittle over an inch) breather holes, O'Reilly and most other stores stock Dorman 555-018.....it is a hair small, however using a 17mm socket you can expand it to a perfect fit by driving the socket into the plug

Re: Oil in injector housing?
 

For anyone doing a catch can - if the can does not turn the airflow a couple times, plus use a filtering material, it probably won't get all the oil out. On my can the air comes in the side of the can near the top and exits out the other side across from the inlet. Inside, there is a verticle seperator plate from the top of the can to about 1/3 the way to the bottom. This forces the incoming air to turn 90 deg moving down the can and then another 180 deg to exit at the top. I stuff the same filtering material in our cam covers in the exit side of the can to stop any remaining oil from the airflow. So far the the pcv connection entering the intake has been dry, and I find oil the catch can. Especially after a high rpm blast or two ----or three---- or----.

Re: Oil in injector housing?
 

I don't expect it to get all the oil out, but some helps

Re: Oil in injector housing?
 

Most of you young whipper-snappers were still squirmin around in chitty diapers when all GM SBC freeze plugs were just a flat disc - just slightly dished. The idea was/is the dished plug fits easily in the hole and would bottom against a little lip that was machined into the hole. The convex side of the plug faced out, and when driven in - thus flattening the disk - the edges expand to tightly seal the hole.

As far as this discussion goes, if there is such a lip in the 90 IH holes, then I'm wondering if the convex Dorman (sp?) plugs might not be thus installed w/o trying to flatten them to fit before installing them? :icon_scra I'm just axin'...;)

P.

Re: Oil in injector housing?
 

On the 91 I/H's that I have as spares there is no lip to stop the plug. You just have to eyeball it as you drive the plug to make sure you don't go too far in and have it fall into the cavity.


I am not sure what there is on a 90 I/H as far as a lip inside the hole. I never tried to pull out the plugs that were there from the factory.

:cheers:
Tom

Re: Oil in injector housing?
 

Same here is the 93- later also had no lip but are smaller DIA holes the the 91s of Tomtom's

Re: Oil in injector housing?
 

I'm currently in the process of removing the secondary vacuum system from my wife's 91. I removed everything yesterday and had a good bit of oil in the IH, PCV lines, and Plenum. I have a catch can from Elite on the way and hope that takes care of the Plenum. I was surprised to see it had IH and Heads as pictured for the 90 MY. My guess is most of the early 91's got 90 parts installed.

Re: Oil in injector housing?
 

Looks like I will be doing this operation....I bought some injector housings from what I was told was a 90 car..OPPS. They are 91 injector housings, now that they have been ported, I guess I need to get some plugs and try my hand at plugging these things up :mad:.
Rich

Re: Oil in injector housing?
 

Hi Rich:

I know this guy who has a 91 (that finally feels like a CAR instead of an antique statue) that would gladly take your IHs if you really want to stay all 90. In fact that pleneum looks like a 91 also... Just want to make sure you know you won't loose anything if you decide to keep your car all 90.

Re: Oil in injector housing?
 

Hey Paul,
Not worried about keeping it all 90, just bugs me the ebay seller advertised them as 90 parts :mad: when in fact they were 91+. Oh well, live and learn, I know better now. I have some plugs coming, I will plug up the holes and move on.
Rich

Re: Oil in injector housing?
 

If you change your mind... just say the word and I'll run over!!! What you have, even if it's the wrong year, is pretty AWESOME work!

Re: Oil in injector housing?
 

Man, these little buggers are tough to find locally in my neck of the woods..3 Autozones, 1 Pep Boys and even a local machine shop...no luck. Will try ordering online.
Rich

Re: Oil in injector housing?
 

Rockauto:thumbsup:

Re: Oil in injector housing?
 

Rich,
If you don't have any luck I can turn you out a set on the lathe out of aluminum.

Re: Oil in injector housing?
 

I also had luck using 555-091...Western auto has them as a 1" plug


I think there are 2 different hole sizes in the IHs, I had one set that needed over 1" and one that did not

Re: Oil in injector housing?
 

Thanks Phil, I was able to order some from Summit, they are back ordered. I will look at some shops when I am in AZ.
Rich

Re: Oil in injector housing?
 

Soooooo, I've got 91 IH coming for my 90. That means I need to do something. Are we still using freeze plugs, or have we come up with something better? Thanks Locobob for the heads up on this. This would have been a big stumbleing block trying to do this over a weekend.