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

[roadkill]

I need to replace the throttle body on my efi setup due to the original one missing parts and not in real good condition. Does anyone know of another throttle body which needs little mods to fit?

Cheers
Alex

Hi,

fairly sure that the 22r efi one is a good swap. You can buy them from america for about $25. I think that's what river used on his 18rg turbo.

bEn

[river]

Hi,

Nahh, I'm using an 18R-GUE unit. I have a 22R bell housing to join the engine to a W58 gearbox, though... and a Starlet throttle cable to join a modifed RA28 accelerator pedal. Sort of an all Toyota bits and pieces affair, but one that makes it look perfectly stock... well, stock if Toyota had ever made an 18R-GTE RA28. Something off a 5MG-E.. or 7M-GE also I think.

seeyuzz
river

[o_man_ra23]

Hi,

you'll need a slave cyl from pretty much any ra20 corona or ra60 corona. Should do the job.

As for the 18rg with the 18rc bottom end. What makes you think it's a 18rc bottom end???? It would have to have modified pistons at least to work. There are a few differences between the bottom ends, but effectively the block, crank, and rods are the same. For extra help, throw some photos up for more help

bEn

Didn't know Coronas were available with the A floorpan

The following vehicles should have the slave cylinder you want and are readily available for cheap at pretty much any auto outlet.
RA40, RA60, RA65, RT142. RT133 should also have the same one, but I cannot confirm. Basically there are only 2 types of W50/W5x slave cylinders. The really early W50's as found on the RA23/28 have a cast iron throwout fork and adjustable slave cylinder, where the later W50's and all W5x that I know of have a pressed steel unit with fixed slave cylinder. Coincidentally the change in throwout fork/slave also had a change in throwout bearing, however the clutch plate, flywheel and pressure plates are all interchangeable (later R motor ie 22R had M11x1.25 flywheel bolts, as opposed to the M10x1.25 bolts of the 18R and earlier)

Hope this clears a few things up.

[roadkill]

Hi,

fixed my errors... didn't realise i was that tired!

bEn

[egamirrorim]

Thanks for the info guys, will chase it up today.
We're certain its an 18RC bottom end, the oil filter position was RC and fouling on the twin carbs...

[roadkill]

hI,

uh, the oil filter goes in the same place regardless. Just uses a different and shorter oil filter the 18rc filter does foul on the carbs. Anything else that makes you think its an 18rc bottom end yet?

bEn

[o_man_ra23]

What Ben said... the oil filter position doesn't change. Noticeable differences between the two blocks are:
- crankcase vent between fuel pump and oil filter on some 18R-Gs (not all)
- Timing cover is completely different to account for the dizzy
- 18R-C Dizzy position has an oil pump drive gear on the RG
- 18R-C pistons aren't domed
- Auxilliary shaft has a dizzy drive cog on the front for the 18R-G and is longer to suit
- Auxilliary shaft on some 18R-GUE's has no lobe to drive the fuel pump
- 18R-G oil pump is longer thus larger capacity
- Some later 18R-G blocks have an extra set of engine mounting bosses to account for the later xmembers (have never seen an 18R-C block with these, however they may exist)

That's about the extent of it. The conrods are a bit lighter on the 18R-C, however unless you are going forced induction, or building a race engine, that isn't an issue.

[roadkill]

Hi,

also the engine number runs the other direction too.....

If the engine was running previously then the only two things i'd be concerned about are the oil pump and pistons potentially being from an 18rc instead of an 18rg. I'm keen to know more as i've seen a few idiots pull apart an 18rg thinking it had an rc bottom end (due to their lack of education and high amount of ignorance) and in the end it just cost them time to clean it up and put it back together as well as the money in having to get new gaskets for it. All for..... nothing.....

At the end of the day i stick by the fact that to get the twin cam engine on you have to swap so much over from an rg bottom end that not spending a little more time to swap the pistons and oil pump over is just dumb/ignorant.

I have though, seen an 18rc engine with an 18rg bottom end in it. IE pistons, rods and oil pump. I'd never turned the engine over, not even by hand. It was in the trailer of junk i wanted to get rid of and i realised the engine number ran the wrong way. Shone a torch into the spark plug hole and there was the dome top pistons The head wasn't torqued down at all so i'd say they just threw it on loosely so it wouldn't fall off.

bEn

[Roscos]

Another thing you forgot to say was that if it is a RG block the engine number starts with the number 9.

Roscos

[o_man_ra23]

RC head on an RG bottom end Ben?? Wow some people are naive/dumb. Did it have the RG timing cover etc??

[egamirrorim]

Toyman told me it's an RC bottom end, he and Scrote have been helping doing most of the conversion, I usually just run around trying to screw things on the wrong way for 20 min before realising! I'm sure there were other indicators but the one for me was that the giant 18RC oil filter was on the engine, not to mention that the long RC oil feed tube was on there, so unless the RG ever came out from factory with an oil filter setup that fouled on the carbs I'd say I have an 18RC bottom end!

[SilverRA23]

My 18RG, complete with engine number starting with 9, has an oil filter that fouls on the carbs when you use the wrong filter ie the 18rc filter

[o_man_ra23]

The long tube up the guts is a worry.

Like has been said though, the best way to get assistance is to provide a photo of the block with no head.

[ian]

the dipstick hole in a different spot ?\
this is an 18rc one
the dipstick enters through the right hand side engine mount

with the 18rg its on the lhs through the engine mount

so if your block is an 18rg it will have the hump for the dipstick but not the hole in the right hand side

this is the oil filter size we used

[egamirrorim]

Thanks for all the info guys, will look into as much as I can, although we wont be taking the head off just to see if it's an RC bottom end as it is sort of a moot point anyway because the engine is in the car and will be utilised regardless. I'm just looking for any long term issues I need to worry about.

Also, where do you attach the hot water hoses on the twin cam head?