For the love of a tractor engine: The life and times of the 18R-G

[RA40peter]

Omegaman,
Here's some pics
As you can see, the main hose (in red)has the T piece in it (blue). The T piece goes straight up through the runners up to the valve in the second pic (in blue).
Hope this helps

Peter

http://img.photobucket.com/albums/v2...r/MainHose.jpg

http://img.photobucket.com/albums/v2...eter/THose.jpg

[o_man_ra23]

Peter, do you know what that valve is actually for??

[Sagluren]

the valve looks like it could be a aircon idel stepup. or some kind of polution re-circulation valve.

cheers

[RA35GT]

Its the A/C idle up Valve.

[RA40peter]

The other 2 small vacumn lines on the valve go back to a switch.
One line comes from plenum chamber to 'vacumn source' on the switch and the other comes from the valve to 'TP' on the switch.
Could be A/C idle up, but I have a wiring diagram that shows a vacumn switch coming off the Emission Control Computer as well. Not sure what it is though.




http://img.photobucket.com/albums/v2...eter/THose.jpg

[Sagluren]

nah, get rid of it if you dont have ac, take out the hole valve and replace with NoS lol.


cheers

[floppy]

Hey everyone,

Just have a quick question about 18RG timing covers and all the bits around it.

I am just putting my RG back together (fixing an oil leak and decided to give it the once over again)

Anyway after getting all the timing chains on, I was trial fitting the timing cover and there are 2 holes that do not have anything that lines up on the cover.

One goes to an oil gallery and the other is just to bolt a guide to on the 18R.

So I pulled apart an 18R I have here and the guide that goes up to the top of the timing cover has an oil jet / squirter that bolts to it into these holes.

I have never had one of these on my RG since having it (well the 2 others I have don't seem to have them either)

So question is, should I use the oil jet from the 18R? or is there a different one for the RG that I am missing, or is everyone just not using it?

Page 4-23 Fig 4-67 of the 18R green book shows the guide I am referring to.

I will try and attach some pics...

Timing cover holes
http://picasaweb.google.com/lh/photo...eat=directlink

With 18R oil squirt temporaryily in place.
http://picasaweb.google.com/lh/photo...eat=directlink

I'm holding off doing anymore tonight until some of you guys take a squizz

Dave

[GT1978]

The 18RG has an oil squirter also but it is simpler in design. Only thing is I cant remember if it is in this spot or mounted higher in the head. The 18RG oil squirter is basically a hollow bolt with a small hole on either side of the bolt head to squirt oil horizontally onto the chain running up and down past it. I'll see if I can find a pick to show what I mean.

Glen

[GT1978]

18RG oil squirter is mounted in the front of the head between the chain going up and the chain coming down. The 18R had a cam gear in this location and that is why its chain oil squirter was located in the top of the block. The 18RG just had a grub screw plugging the oil hole in the block I think.

Glen

[floppy]

Hey,

yeah I forgot to mention the oil squirter that was in the head is all good.

But figured I either need the 18R one in here, or I need to block it off.

If I don't, wont it let too much oil through (ie no restriction...)

So short bolt with thread sealer and a copper washer to close off the original 18R place?

thanks
Dave

[bv73]

hey all , just picked up a ra28 with a fresh rebuilt 18rg with a problematic head , even though the the head (111-8250) has been rebuilt twice over the last 6 months the previous owner has stated that it has gone soft? and i would need another 18rg head.
is this a common problem?
regards des

[RAd28]

My little brother had this problem with his 3S.. apparently being aluminium if they overheat (for too long/ or too hot?) the material can go soft... we just had to bin the soft one and get another... shouldn't be a problem with the 18RG, they regularly sell for $50 - $100, check out the classifieds section, i'm sure there's one floating around atm...

[Steve M]

What are the symptoms of it going too soft?

[RAd28]

Symptoms from a engine running point of view? i have no idea... we found that the 3S was too soft when we took head to get it checked out for warpage after it overheated... so i guess in this case it was all the typical overheated engine symptoms, but how you'd know it was soft otherwise, i don't know...

[Sagluren]

there is a way you can fix it, but it costs, if it is not a special head, get a new one, it will give you a chance to make better head.

sam.