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

[The Witzl]

will cliff cover my travel expenses?

[Mr DOHC]

i'll see if he has an email

[Omegaman]

Since you guys on this forum have assisted with my ra28 rebuild, I found an old book I have with some info that may help.
specs for 2tg & 18rg
rebuild parts no's for 2tg 18rg
trd engine bearing applications
oil pump part no's
mikuni carby part no's & jetting recommendations (stages1,2,3,4)
trd flywheel applications, variety engins Eg 18rg
transmission ratios std part no's & trd No's w50, t50 series
plus theres other info not sent eg nos applications guide1600cc to 3000cc with efi
bore x stroke hp @rpm ,specs on most engines
ignition converions to electronic with part no's 18rg 20r 22r .t series etc.
trd header applications & part no's most models
trd high perf clutch apps with part no's
trd brake pads and part no's most toyota's
trd suspension front & rear most models Including celica 71-77 78-81 gt-st82-85 gt-s83-85
shocks high pressure and low pressure shocks . & adjustable
And performance suppliers mainly from the US
If there's an interest in any of these items, drop me a line.
and more how too's
regards






















Ive noticed they might be hard to read because I've shrunk them a bit.

[KE30_18r-gu]

hey Omegaman.

can you email me the pictures. As you said they are a little small to read. Thanx

neti01@optusnet.com.au

Adam

[Norbie]

I can host the full-size pictures if required.

[jeffro ra28]

sounds good norbie!

[Omegaman]

norbie I've sent you the toyo info,to do as you will.

Also adam (ke30) I've sent them to your email add too.

They are interesting.

[scootaphill]

How much does an RG weigh? just out of intrest

cheers
phill

ps karl howd your wiring turn out... hope my diagrams helped

[Norbie]

Thanks for that Omegaman.

For those who want to see the full-size pics, click here. Dial-up users beware, some of them are over 1mb.

[Turdinator]

Omegaman on page six before it talks about Mikunis it talks about webers.
I don't suppose it has jetting recommendations for them as well?

[Grant]

While I should really put this in the Wanted section seeing as it is an 18RG thread only it seemed a good place to ask about anyone with a set of second hand leads for an 18RG. They are for a friend in the US.

[Omegaman]

Turdinater, there no info on jetting for webers.
I have attached previous pages 75, 76 to go with page 77.
See How you go, it does suggest how easy it is to change the jets.

[Norbie]

OK, so the vacuum advance on my new 18R-G isn't working. I've been experimenting with a timing light and hooking up the diaphragm to different parts of the manifold (including parts which definitely have vacuum) and it makes no difference whatsoever to the timing. If I manually push in the plunger the timing advances plenty so the advance mechanism is working fine, it's obviously the diaphragm which is stuffed.

Anyway I pulled the diaphragm assembly off the distributor hoping it would be fixable, but it's a sealed unit and there appears to be no way to get inside it without destroying it. This means I need a new one - but where from? Does anyone know if other Toyota distributors have a compatible vacuum advance mechanism? I'm going to the wreckers on the weekend to see if I can find anything similar (22R perhaps?) but I was hoping someone might know. Help a brother out, my Celica is so slow at the moment it's almost dangerous to drive!

[thechuckster]

i have an 18R dizzi (complete with a pertronix hall effect pickup and igniter) with a functioning advance unit if it helps - will swap for information on:
-rotation of crankshaft (has been so long i forgot) when looking at it from front of car
-markings on 18Rx pulleys (which if the 3 is TDC)
-whether the keyway in the 18R cranks is vertical at TDC or offset towards the drivers side

[The Witzl]

chuck

1. facing engine, clockwise
2. facing engine, furthest left
3. vertical, IIRC


norb... i'll get to that vac advance now. Lucky i'm nice hey?

[Norbie]

I'm feeling the love, Witzl style!

[Steve M]

The 18R and 18R-G vacuum advance mechanisms are different in vacuum resolution and also fitting depending on which model 18Rg dizzy you have.

We have an 88230 dizzy here that uses a vacuum advance that has too small a diameter where it mounts into the dizzy casing for later model one to fit. You'd have to modify either the housing or the vacuum advance. (the casing on this one uses an RT-40 dizzy cap and the casting is similar to that model dizzy in other respects and also internally.

Later models (88251, 88270) use a more regular sized advance unit (the models that are suited to the 22R electronic conversion).

The 88230 one that we have acts from 0mm/hg upwards with the action levelling off at about 150mm/hg.
The 18R one starts acting at about 150mm/hg and levels off at about 330mm/hg.

I do original 88251 and 88270 ones that I could measure up to see where they work. I would have to find them though, which is not such an easy task these days, we put everything into boxes and stacked them...bad move.

Hopfully this helps, but if you really want the specs of the later model ones. let me know and I'll tack it down for you.

[Norbie]

Thanks for the info!

I'm not 100% sure which dizzy I have, I just bought the engine and don't know its history. Perhaps o_man_ra23 would care to enlighten us?

[Steve M]

If you post the part number of the diaphragm I could check what I've got and how it compares to other types.

[Steve M]

Norbie, still on the topic of the vacuum advance, here's a link to where I just put up the specs from the 1977 edition of the 18R series engine repair manual.
It pretty much backs up what I said first time, only it states what the figure i measured were supposeed to be.

http://www.toymods.net/forums/showthread.php?t=4080