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

[brett_celicacoupe]

thought i might add this link i found a while back.

not sure where it came from or if any1 already found it but anyway;

http://users.on.net/~csharman/docs/18rgeu.pdf

[o_man_ra23]

The upper timing tensioner of the 18RG looks to me to be the same as that of a 3TGTE. I have an 88230, with the shorter version of the 88210 runners, and the carbs which are shown in the left. The pipes that go off to the balancer are indeed 5/8", and as for the ancillaries that the outlets go to... well ive never had them connected to anything, they were blocked off when i got the carbs... so does anyone know what they were actually meant for?? charcoal canister perhaps??
The 2.4l conversion is said to be a poor one to undertake, as the bore/stroke becomes out of square, and the motor loses its revvablity(much like a 22RE). I would be more inclined to go with just the 2.2l conversion, as this will still revv quite well.
The shorter runner doesnt give much in the way of more top end power, what it gives is much better throttle response, which makes the top end more controllable.
Jeffro, how did the head I sent down to you turn out?? It all seemed quite good (apart from being dirty).

Cheers, Owen

[The Witzl]

I'll get some pics up of river's 100% stock 88230 engine and another 100% stock 88253 engine which show where all the ports on the balance chamber are connected to....

I've also got two 18RG's in parts to get some comparisons of individual parts and componenets.... will start to photo catalogue it all tonight

[Mr DOHC]

if u need any pics of stuff for cataloguing karl, let me know

[Celica RA45]

carl that inlet with solexes that i sold you came off a corona with a 9rg 1900 cc

[Garth AE86]

there was an ae86 around with one of these in it recently i think

anyone own it?

[Steve M]

Mr DOHC -

if u need any pics of stuff for cataloguing karl, let me know

Same here, if you want pics and can wait for prints for me to scan in, no digital camera yet I am a bit of an 18RG hoarder, I don't get rid of much and if I find something, I just have to have it.
We cleaned out the storage facility the other day, filled $200 worth of various sized boxes,
The big bits didn't fit in the boxes though.

[Gleno28]

Hey Witzl, a while back on the other forum i put up some pics of the 88210, 250, 253 and 270 heads together that i had. Got detailed pics of the 210 and 250. I can email them to you if you want some extra pics for the thread.
Cheers
Glen.

[The Witzl]

Please do!
Email: thewitzl AT optusnet DOT com DOT au

Once i get back from holidays, and have some time to sort through my engines in pieces (i have to finish building one too!) I'll get cracking and get some pics and reference data up into this thread =)

[Steve M]

I just thought of another spec to put in here.

The camshafts are to be lined up with both camshaft timing slots (on flange next to front cam cap) are to be lined up at the 12:00 vertical position when the engine is at TDC for cylinder 1.

[The Witzl]

OK... time for some PICS!

This pic shows the differences in the 88230 and 88250 cams. Note the thickness at the front where the cam gear is attached!!



the following two pics show the cam gear differences, 88210 and then 88250





this is the valve bucket, with the shim still inside.... just in case you didnt know



one and a half blocks.....list of parts:
1/ oil pump drive shaft. This is the 88250 one, with the fuel pump cam and dissy gear
2/ the oil pump, complete and assembled (and dirty)
3/ 88250 8.7:1 pistons and rods
4/ 88250 cam gear...
5/ head bolts
6/ 9.7:1 pistons from a previously rebuilt engine, broken..
7/ gudgeon pin (piston pin)



close up of one of the broken 9.7:1 pistons. They were 0.5mm oversize, and a couple had managed to blow BOTH ring lands for about 1/3 of the circumfrence. 3 of them also had busted skirts

You can see the broken ring lands here



Those broken ring lands came straight out. Even more interesting was that whoever rebuilt that engine used 18R-C rods! Look at the 18R-G rod to the right!!





Now here is a mind boggler - look at the part number for this 0.5mm oversize 9.7:1 piston!!!!

[The Witzl]

more pics....

This is a COMPLETELY original 18R-G from River's RA25 GT. Cant remember if it's 88230 or 88210.... i think its 88210.















This is the Toyota Genuine oil filter - USE IT!



Just an 18R-GEU, for reference



My busted 88253 in pieces...

[The Witzl]

Here we have a completely disassembled and cleaned oil pump. NOTE the spacer at the bottom left - this is what makes the 18R-G pump different to an 18R-C one.



Here we have the 18R-G vs 18R rod comparison. Interestingly, the 18R-GEU lists the same part number for a rod as an 18R



a valve assembly. wow



valve guide on 88250 head



with the exhaust valve removed, here is the view of the exhaust port looking from combustion chamber on an 88250 head.

[Gleno28]

Great work Witzl! you get more rep!
Another thing i noticed is that on my 88210 head, there was no yamaha logo compared to all other 18RG's??? maybe didn't want to advertise yet??

Also, (i'm sure it's been mentioned before) there are a few sorts of tappet covers, depending on the head with writing and oil cap on different sides.
Cheers
Glen.

[The Witzl]

yeah thats right, this is why some people refer to the later model 18RGs as the "yamaha head" version - when in fact they are all Yamaha heads (as is every toyota "G" head)

[river]

Hi,

Nice pics. Good visual info. Damn it, my engine needs a new paint job - that'll be done very soon. I don't like that brown gunk under that thing in the oil filter pic. I'm gonna have have a look at that next time I'm home.

seeyuzz
river

[The Witzl]

dont worry about that too much - its the carbies leaking a little fuel and then leaving a residue once the petrol evapourates, allowing shit to stick to it good. Mine do it too

[jeffro ra28]

Its photo time!? well this photo has been posted before, but it will make it easy future reference.

[jeffro ra28]

These can also be very helpfull.

[ta22gt]

If someone in bris would like to come round to take some photos of my head and piston it will give some more ref. material for those interested in the 2.2l option. I have had heaps of head work done and it is running 12.5:1 comp forged pistons

Nev











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