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Location:
Brisbane
Registered:
December 2002
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18RGU Rebuild..what's your advice??
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Tue, 27 May 2003 09:05
 
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i don't actually know if the 11111-88270 head did indeed have bigger valves than the 88250 head. The 88250 head has 45/37mm valves and i think this is what is also on the 88270 head. The main difference i thought were that the EFI head has double valve springs, bigger better flowing ports and reliefs in the intake ports for the injectors. Oh, and slightly shorter duration cams 
My recommendations:
- Head port/polish
- Don't shave head anymore than ABSOLUTELY necassary
- Earlier model 18R-G cams (if you can find em 88230or 88210) or a nice regrind
That should do a little better than stock and not cost a spare kidney.
AS far as where to get the parts.... im not so sure. Talk to a decent engine rebuilder and they should be able to chase down a couple of contacts for you
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Location:
brisbane
Registered:
March 2003
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Re: 18RGU Rebuild..what's your advice??
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Tue, 27 May 2003 09:48
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you should get bottom end bearings and con rod bearings done to while you got it out... any engine leaks or main seal leaks.. better off doing them as well while it is out
but the full gasket kit will be around 300 or so dollars
you could get away with the gasket kit minus head kit and just buy the head gasket that will be a big saving..
get the head checked of what needs to be done and yeah if you wanna port it do it.. will give a bit more power
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18RGU Rebuild..what's your advice??
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Tue, 27 May 2003 09:52
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if u just want something that is reliable u should just buy another cheap engine. It would be alot cheaper then rebuilding the 18rgu engine.
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Location:
brisbane
Registered:
March 2003
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Re: 18RGU Rebuild..what's your advice??
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Tue, 27 May 2003 09:56
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depends on how cheap you wanna rebuild it... a good 18rg is bout 600+
they sell in the trader fully rebuilt for just over a grand
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Location:
Gold Coast
Registered:
January 2003
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Re: 18RGU Rebuild..what's your advice??
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Tue, 27 May 2003 20:25
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Hey blaze - from my experience with customers that have had RACQ inspect there car, then sent to us, i have found them to have very poor diagnosis skills. I would consider having a second party look at it for you.
He did have the throttle wide open when doing the test? Cam timing is good? Just some things that may affect test results.
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Location:
Hornsby, N.S.W
Registered:
September 2002
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Re: 18RGU Rebuild..what's your advice??
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Tue, 27 May 2003 21:07
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dam, he beat me in, but thats what i was going to say, you should get a second party to inspect whats going on, and if you are going to pull the enigine down, you might as well go the whole hog, that way your gaurenteed that the thing is in good running order.
justin
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Tue, 27 May 2003 22:50
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Well I got my compression gauge last night and tested it while hot, Full throttle and it only got to between 100-110 PSI. I know it should be between 148-152 PSI. Not good. I just checked this morning and No wonder the thing won't start cold. Friggin 50 PSI. I have no Idea why it is running so smoothly once it gets going and why it is not blowing any smoke. These engines must really go when everything is good inside.
I did think it was a little under powered, but i thought that was just because I needed to get it dynoed.
I will look at the bottom eng while I have it open but if it looks alright I'll leave it and just do the rings,timing chain, valves and springs. I guess i won't know until it is apart. But if anyone knows of who to call or to get parts from let me know.
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Location:
Canberra
Registered:
December 2002
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Wed, 28 May 2003 00:36
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thanks Jason, How is yours going? I will give them a go. what have you done to yours did you have to rebuild it??
this engine that I have put in was sitting for a while. After using the car for a week and a bit, could this have some how mde the rings go sloppy from the heat after not being use for so long. that is the only explaination i can think of. it seems to be getting worst over time.
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Location:
Canberra
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Wed, 28 May 2003 01:18
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Leaving the engine for awhile wont affect the rings possible causes that i can think of off the top of my heap are:
1.Depending on how long the engine was sitting and seing as how you have a fairly humid climate rust may have formed on the bore and chipped parts of the rings away when it was turned over.
2.The car may have been running to lean etc thus annealing the rings which makes them sloppy (speculation)
3.The engine is just plain old tired.
If your going to pull the engine down you may as well rebuild it properly remember that you can use most 18r gaskets even the head gasket if you have to.
At the moment im porting and polishing the head taking a bit longer than i expected because im trying to do to much at the moment and to make matters worse my baby kissed the back of a VX commodore about 3 weeks ago but we will get there.
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: 18RGU Rebuild..what's your advice??
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Wed, 28 May 2003 03:12
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My friend said it will cost me about a grand to get a full re-co. mine is pretty stuffed though. I haven't really had a good look into it because the engine is on hold until I get the car on the road. IF I get the car on the road!
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Location:
bris
Registered:
February 2003
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Re: 18RGU Rebuild..what's your advice??
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Wed, 28 May 2003 07:09
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blaze - an old trick (works on the other single cam 18R's) to test the condition of the rings when you have low compression is to take out a spark plug and squirt a couple of drops of oil in.. then do your compression test again, if the compression pressure rises your rings are rooted, but if you compresssion pressure doesnt rise or fall by any (significant) amount your head gasket or head itself are to blame
in my experience with 18R-G the bottom end doesnt really need all that much attention unless you've mised a few oil changes or not followed a proper oil schedule i.e higher viscosity oil for the older the engine gets... the heads (i'm told) do tend to get tired after lots of spirited driving
i'd suggest you go out and buy some stuff called called 'lucas engine reviver'(you can find it at any supercrap or autobarn) the non-teflon based stuff, shove a litre of that in and it should raise the compression a litte and stop the oil comsumption... this stuff is good as it doesnt coat the internals in teflon and make it a shitter to do a rebuild later on - the lucas stuff is great, i once put it in a dirty old 202 that was running roughly 80psi compression and it ended up giving me 3 years of loyal service, i took it apart for a rebuild and discoverd that it had been running all those years with only 2 commpression rings still intact
i can suggest a place caled k&m auto spares on Orange Grove Rd for all the parts needed fot the re-buld... i went there when i was rebulding a mates 18R-U and he had all the parts ready in about 3 hours... awesome prices too
hope that helped
cheers
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Wed, 28 May 2003 07:26
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I'll give that a try. The trouble is it isn't using any oil. so I tnd to think that it is the head/valves. BUt it might just be that everything is a little tired.
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Location:
Brisbane
Registered:
October 2002
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Re: 18RGU Rebuild..what's your advice??
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Wed, 28 May 2003 11:13
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whoa hold up, first do the tappets, thats all that was wrong with mine, the shims neded to be skimmed a few thou and i had compression after that
intake is 0.24-0.34mm
exh 0.29-0.39mm
cam timing must be to factory spec for that
i.e. both timing slots on the front top of cams must be straight up
this is whats in my GENUINE toyota 18RG book
if they're cool, do the 1 tbs of engine oil down each bore test.
part number for FULL gasket kit for 18RG/U/E ir GK690 for a permaseal kit
go to chilton automotive in wooloongabba for this kit as thats where i got mine
K&M automotive are VERY good at what they do and are VERY cheap, use them, they can source anything in 5 minutes flat 
get compression tests done definately {$100 or $120}
and maybe a valve grind too, if u got the cash get the valve guides and seats done so u can use unleaded all the time {the transport dept wont know that, so u dont have to get a cat conv.}
rings are about $50, big ends are about $50 and mains are about $50
plus labout for the rebuild if u dont R&R it yourself
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Location:
Canberra
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Thu, 29 May 2003 00:21
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| philmelvin wrote on Wed, 28 May 2003 21:13 |
rings are about $50, big ends are about $50 and mains are about $50
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Are those standard 18r rings or rings and bearings for the rg?
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Thu, 29 May 2003 01:10
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I just rang the chilton mob at the gabba. a bloke there was very helpful and advised me that maybe it wasn't rings or pistons as it was running fine a wek ago. he suggested that there might be a problem with a timing chain or a guide. and that might be why it is happening on all cylinders. So If anyone can recommend a good mechanic in Brisbane, prefered south side so I can get them to look at it and tell me what I am in for.
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Location:
brisbane
Registered:
March 2003
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Re: 18RGU Rebuild..what's your advice??
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Thu, 29 May 2003 07:08
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i justr ecently rebuilt my 18rg.. i used std 18rc parts and the big ends were actually 105.. rings were bout 70 or so and the conrod bearings are bout 40 i think so yeah 
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Location:
Gold Coast
Registered:
October 2002
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Re: 18RGU Rebuild..what's your advice??
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Thu, 29 May 2003 08:03
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you may have worn valve seats/other valvetrain wear causing valves to stay open a small amount like .1 of a mm causing the cylinder to lose compression. im having this problem due to shitty lead replacement petrol.
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Location:
Brisbane
Registered:
October 2002
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Re: 18RGU Rebuild..what's your advice??
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Thu, 29 May 2003 08:22
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yeah standard shit {so long as the crand hasn't been ground or its been bored out}
I paid about 40 for rings and $42 for the mains
i didn't replace my big ends
i'm in the spare parts industry so i get stuff at like retail minus 20%, 40% sometimes.
exactlt where on the southside {logan, mt gravatt, yatala ect}
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Location:
brisbane
Registered:
March 2003
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Fri, 30 May 2003 03:13
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If you guys have done this recently yourselves then could you please give me a hand. if not come and look at it then help me find the parts I need. Any help would be appreciated.
thanks
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Location:
Canberra
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Fri, 30 May 2003 05:31
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Id come give you a hand Des but its a bit far for me to travel
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Sat, 31 May 2003 03:27
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Thanks Jason, Just drop round for the arfternoon. that would be fine. Nah I just need to talk to someone who have done one of these up. The only engines I have rebuilt are corolla 3k and 4k engines. Parts where a bit easier to get for them. it was 14 years ago though. But if someone could lend me a bit of technical help I could really use it
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Mon, 02 June 2003 04:11
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Well I just checked the valve clearances and have found a bit of a problem. The exhaust valves clearances are within the tolerances, but the inlet valves semm to have a constant pressure on them, I assume keeping them open a bit. this is happeneing on all of them. the timing of the cam seems OK. What is your advise people?? has anyone had this problem??
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Location:
Gold Coast
Registered:
October 2002
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU Rebuild..what's your advice??
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Mon, 02 June 2003 09:57
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From what I have been told and from what I hear alot of other guys on here say you can use unleaded in these engines because they already have hardened valve seats. I think the problem has gotten worst since I went from unleaded to premium unleaded.(cold starting) I mean. I am sure it is original cams. and it looks like the intake cam is at the right position and timing. it just looks like the cam is putting pressure on the buckets all the time. because I tried to rotate it round to a point where I could get a feeler gauge under it and I couldn't. But only on the intake valves. exhaust are fine?? do I need to get the shims(buttons) looked at(shaved). And if so how do I work out the thickness I need.???
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18RGU Rebuild..what's your advice??
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Mon, 02 June 2003 12:11
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to tell if the cams are the original items from your motor - along each lenght of each camshaft should be a part number, and that number should end almost identically with your head number.
eg ********-8825x (x = 0 or 1) if you have the 88250 head.
Also as far as 18R-G's running on unleaded petrol.....
if you have any head older than 88230 then your 18R-G* WILL RUN ON UNLEADED PETROL! Just be sure to use premium to keep the octane high enough!
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