Oil in injector housing?

[tomtom72]

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!

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.

[-=Jeff=-]

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

[-=Jeff=-]

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

[zr1don]

Update on my "oil in injector housing" question. When ready to install the intake plenum I noticed small amounts of oil coming out of the intake runners when I had the manifold tilted at other then a level attitude. I did not remove the throttle body from the plenum and I had not looked into the plenum yet. I opened the butterflies, used a flashlight and found the source of the oil. It was pooled in the bottom of the plenum and would not run out unless the plenum was tilted off level. The oil must be coming through the pcv system. I have cleaned the plenum and pcv hoses (the valves are new). I am installing a catch can and will post the results when I get it running again. This could be causing failing the N0X standard on my emissions test.

[tomtom72]

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?


Tom

[zr1don]

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.

[-=Jeff=-]

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

[tomtom72]

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!

[-=Jeff=-]

Originally Posted by tomtom72

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!

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

[tomtom72]

Originally Posted by -=Jeff=-

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

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?


Tom