Help spot what's missing - 22R

[pisana]

Hey all,

Went for a short cruise not long ago, got home, turned the car off and heard a hissing noise, popped the bonnet and the noise kinda sounded like bubbling.

I traced the noise to the head, carby side at the rear where at some point it looked like something was bolted to the head yet on mine it's missing.

Example pic..



If anyone could very quickly pop out to the garage and take a photo for me, or at the very least tell me what's missing from my car that would be bloody great.

Cheers

Phil.

[Youngy]

The hissing comes from the unused EGR (Exhaust Gas Recirculation) port just behind the last inlet port in your photo.

With three bolts around it roughly in a traiangle pattern. If you follow it, it will go through that black cover on the back of the head and to the top little keyhole section of each exhaust port. Which on your motor is probably covered by the exhaust flange.

[pisana]

Thanks for the response, on my car it looks as though nothing has been on that rear port for some time.

Can i leave it as is?

Another thing, the hissing sound went away after i took the radiator cap off. The sound is definately coming from that rear port though.

[Donmik]

Your EGR has probably been blocked on the exhaust side, cause if there is no plate on the inlet side it would be making an awful mess....

The hissing is definitely coming from the port???
But you have never noticed it before???
Was the engine temp hot??
If the noises went away after you removed the radiator cap, sounds to me like you got a water issue....
I own a couple 22R powered cars and it seems like I'm forever chasing split hoses....
And the noises you just explained is exactly what I get.....

[pisana]

Interesting, the sound is definately coming from that port, I drove the car to work today and it hissed from that port after I turned the car off. The sound went away when I removed the radiator cap.

I've had the car for all of 2 weeks so haven't noticed it before, I had one over heating problem but this was because the thermo was stuck closed. I changed it to a newbie, flushed the system and replaced with new coolant and it holds the temp fine now.

Now that I think about it, I think I am losing coolant but at a very very slow rate, my over flow bottle is half full whereas it used to be full.

Can I get away with leaving it as I is? Or should a get a plate made up to block it off? The car seems to be running fine.

What exactly comes out of that port? Just air? If I block it off will it cause me any problems because of the hissing?

I'm just trying to get this car sorted and roadworthy, it's done 320,000kms, doesn't blow and smoke and still feels strong, I just need it to last a year or two so I can cart my tools around for work.

I might take a photo later to show you, the port looks to be pretty clean inside.

[pisana]

http://s1111.photobucket.com/albums/h480/pisana81/Snapbucket/?action=view&current=E6050205-orig.jpg

[Donmik]

In that port should be exhaust gases, On the exhaust side of the head you will see your EGR port which is casted into the head at the bottom of the exhaust ports, that port run to the plate at the back of the head (you can see it in the photo you uploaded earlier) on the plate you can see where the gas wuns upwards, then diagonally through the head to the port in question.... Whats "meant" to be there is a plate that has a pipe connected to it which will redirect the gases into your manifold....
so if you had no plate (like you do not) and the EGR was still operational you would have black risidual gases EVERYWHERE.... so it sounds like your sweet, But no harm would come from blocking that port!!!!

So having said that, if you are certain that the noise is coming from that port, it almost sounds like you have water leaking into an exhaust port which is HIGHLY uncommon for a 22R...
If it where me, I would be having a good look at the water pipes, hoses and gaskets in that area... ACTUALLY even the rear plate on the head, as that has the EGR port AND water going to it....

Hope this helps...

[Donmik]

I just looked at the photo and that seems to be very clean, so im confident in saying its already been blocked prior to that port....

[pisana]

Dude, thanks a heap, very helpful info.

I'll look at all my water pipes and gaskets. Is there a slight chance I have a leaky head gasket?

Where would that port be blocked for that to be so clean? The exhaust? There must be a leak some where there.

I didn't think exhaust and water were inter related. That plate at the back of the head sounds interesting, and also a royal prick to get to.

[Donmik]

Happy to help mate!

If you pull your exhaust manifold off it should reveal something as to were it's blocked...

It could be a leaky head gasket, but I would only consider that as a last resort as it's not the most common thing...

I never said that plate was easy to access!!!
The gases and the water don't actually mix, but that plate is a block off to the water jackets, and with the gases also running through it you could have a split gasket that separates the two!!!

[pisana]

Sounds to me like that rear plate is the cause of all my greif, have you got any links or pics to some schematics for that rear plate? That way I can get an idea of what bolts are where as your kinda working blind on that thing.

Tried searching but I just get egr diagrams.

Cheers.

[Youngy]

I have never seen a carb 22R with it hooked up. I could be wrong on that though.

The only ones I have seen that use that port and the EGR are the 22REs (EFI) from the RA65 or Corona in Aus.

I wouldn't worry about it at all

[Youngy]

The gases and the water don't actually mix, but that plate is a block off to the water jackets, and with the gases also running through it you could have a split gasket that separates the two!!!

It is a cast part. No gasket is used except for the plate to seal the water jacket as you have said. The pass through is not separated as part of the casting. I recently replaced mine with an alloy block off plate since it is not used.

[pisana]

Youngy - so taking off that rear plate to change the gasket won't help my cause?

At what point does the water system and that port cross / go near each other?

[pisana]

I kinda have OCD when it comes to this stuff. That and the fact that it is using coolant at a very slow pace but that's not to say it won't get worse.

Also, do most carby 22r just have the port open like mine? Or is there is a plate?