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Location:
Puckapunyal
Registered:
April 2003
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 18RGU issues
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Sat, 09 August 2003 01:34
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I was talking to a mechanic the other day regarding my rattling timing chain in the 18RGU. He said that the big bolt just above the dizzy was a timing chain adjustor (moved the chain tensioners manually).
Course I played with the adjustor and now it runs like sheit under load - tried adjusting it back to no avail and playing with the timing to compensate but no go.
Could someone please tell me wtf that biga$$ bolt really was (and i'm hoping it's not a cam adjustor)? 
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Location:
Puckapunyal
Registered:
April 2003
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Re: 18RGU issues
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Sat, 09 August 2003 02:04
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I mean the BIIIG bolt between the dizzy and the water hose on the 18RG
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Location:
SYDNEY
Registered:
August 2003
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Re: 18RGU issues
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Sat, 09 August 2003 03:35
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from what i remember, it is a timing belt adjuster.
you place a screw driver in the hole on the top of the nut a push it in. This should show you the tension of the belt by the travel in the driver goes. If you cannot feel the driver move slightly inwards the timing chain is to tight. I cannot remember the play it should have but my one seems to travel about 3mm inwards.
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Location:
Brisbane
Registered:
October 2002
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Re: 18RGU issues
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Sat, 09 August 2003 07:55
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it IS a cam chain adjuster
its supposed to have 0.5-1.0mm backstroke at 3-5kg
dunno how to measure but thats what it says in the GENUINE 18RG book
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Location:
Puckapunyal
Registered:
April 2003
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Re: 18RGU issues
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Sun, 10 August 2003 03:29
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What engine do you have exactly. Good to hear that it is a timing chain adjustor but mine is a little different. It has a large nut that adjusts in until it hits the nut before it. The nut before it also can be adjusted by turning it in or out. There is then a rubber boot through to another nut near the engine head.
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Location:
Puckapunyal
Registered:
April 2003
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Re: 18RGU issues
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Sun, 10 August 2003 03:31
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Thanks MR DOHC - I dunno what it means either :0) But i'll try to figure it out.
I used to have an 18R-C and 18R-G engine book once, but it's gone missing *sob*... I was hoping to scan it into a PDF and make it available online.
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Location:
MACKAY
Registered:
May 2002
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Re: 18RGU issues
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Sun, 10 August 2003 04:00
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OK to get the adjustment right , unlock the lock nut and screw the locknut in towards the head a few turns this is just to get the locknut out of the way for now , then push a screwdriver through the hole in the center of the adjusting nut and hold a bit of pressure on it while you turn the motor in the normal direction with a socket on the crank nut until you feel the screwdriver move in , when the screwdriver is in at the furtherest point keep holding the pressure on it and screw the adjusting nut in by hand until you feel it hit a stop then back it off 1/2 to 3/4 of a turn then screw the locknut out and lock it against the adjusting nut without moving the adjusting nut.
Trevor
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Location:
1st street on the right
Registered:
November 2002
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Re: 18RGU issues
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Sun, 10 August 2003 06:57
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The weight preload measurement can be gauged by using a spring balance scale available from fishing shops usually (the one on sunnyholt rd Btown syd has them) also good for preload setting on gearbox and diff bearings.
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Location:
1st street on the right
Registered:
November 2002
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Re: 18RGU issues
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Sun, 10 August 2003 06:57
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The weight preload measurement can be gauged by using a spring balance scale available from fishing shops usually (the one on sunnyholt rd Btown syd has them) also good for preload setting on gearbox and diff bearings.
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Location:
1st street on the right
Registered:
November 2002
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Re: 18RGU issues
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Sun, 10 August 2003 06:57
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The weight preload measurement can be gauged by using a spring balance scale available from fishing shops usually (the one on sunnyholt rd Btown syd has them) also good for preload setting on gearbox and diff bearings.
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: 18RGU issues
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Mon, 11 August 2003 02:41
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Have you seen inside the timing case lately? Is the tensioner still attached?
They tend to break in 18R-C's and G's.
I couldn't get my timing chain to be quiet then I pulled the case off and realised why.
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Location:
Adelaide and Queenstown T...
Registered:
September 2002
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Re: 18RGU issues
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Mon, 11 August 2003 03:28
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Mine is leaking and i can't get the frigger off. I was told that it is just an O ring inside that needs replacing, but how the hell do i get the mongrel out! What size is the nut next to the head? 30, 31 or 32mm????
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Location:
Canberra
Registered:
December 2002
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Re: 18RGU issues
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Mon, 11 August 2003 03:32
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You could use a metric/imperial adjustable spanner (aka shifter) 
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Location:
Adelaide and Queenstown T...
Registered:
September 2002
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Re: 18RGU issues
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Mon, 11 August 2003 03:40
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Tried that, not enough clearance around the thermostat bypass hose or the front carbie.
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Location:
Adelaide and Queenstown T...
Registered:
September 2002
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Re: 18RGU issues
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Mon, 11 August 2003 06:45
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after calling and driving around for 3 hours I finally found a 32mm socket big/long enough to get the thing out, now how do I take it apart to replace the seals in it??
sorry about the hijack Kergen.
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Location:
Puckapunyal
Registered:
April 2003
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Re: 18RGU issues
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Mon, 11 August 2003 11:50
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Thanks for that, i'll give it a go.
I'm pretty sure that at the end of the adjusting nut it's solid metal but honestly I havent given it a real close look (could be covered with gunk). I'll give it a go tomorrow.
Thanks for the help ppls
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Location:
Puckapunyal
Registered:
April 2003
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Re: 18RGU issues
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Mon, 11 August 2003 11:57
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Hah, that's ok 
I had an 18RG-U in my old RT-132 Corona and I have another one in my 77 RA28 and they BOTH LEAKED OIL at that bloody timing adjustor.
RA28CHICK - It wouldnt surprise me if the Tensioner is buggered. I sat down for 20 mins and tried to take the Timing Case off the spare 18RG-U in the shed to see what was involved and ended up giving up (couldnt take the big a$$ bolt off the pulley).
Methinks that I might as well do the whole kit and kaboodle, rip the front off the RA28 and replace the whole timing gear/tensioner/etc.. I dont know how many K's the engine has done anyhoo... best to be safe.
18RG's are an interference engine yes?
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Location:
Brisbane
Registered:
October 2002
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Re: 18RGU issues
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Mon, 11 August 2003 12:00
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it should have a 8mm hole at the end, i never bothered to correctly tension mine, i dont have a rattle even at 8000rpm+,
oops
i have 18RGU btw
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Location:
adelaide
Registered:
May 2002
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Re: 18RGU issues
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Mon, 11 August 2003 13:58
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Hey, when we finally got my 18R-GEU up and running we found it had a stretched timing chain, and the inlet valves had been hitting the pistons SO...
to answer a question yes the 18R-G's are all interference engines if thats exactly what it means? but im not sure.. but i know the late cam timing from the stretched chain made the valves hit the pistons..
I wasnt planning on doing a rebuild because i had bought the motor on an assumption that it was in good order.. but these things happen so,
ANYWAY..
i needed new:
timing chain - this was not too hard to get from Sleeka Spares, about $33
adjustable curved tensioner-guide - ALL these guides were quite hard to source and the curved-adjustable one was about $200 from S.S...
top guide - about $70
fixed curved guide - about $160
head gasket - $55 genuine Toyota
timing cover gasket - $11 from 18R-c
inlet valves - This was the hardest part to source.. but once found was amazing @ $13 each!!!
A great place to start when no where can find parts for your old motor is Stewart Wilkins Motorsport.. i was screwed until i found these guys and they were very helpful.
http://www.swmotorsport.com.au/home.htm
They had good prices and all there stuff is listed on the site..
Only problem is that adjustable guide was going to be a 4 week wait from Japan so i decided against it.. and it seems to be really tight and quiet at least now. And plus im $400 better off, seeing the complete motor only cost me $500!! I didnt exactly have the spare $$ to fork out that much for timing guides! mine werent that bad really its just something you want to replace when they are out, but when you are confronted with a price like that i will pass for now until i can afford it.
Just thought i'd let you know about what you might be in for if you want to replace the whole timing assembly. Check out the above link for some prices if you are interested and cannot find any that are cheaper. If you can, TELL ME ! hehe
Seeya,
Guy
Oh and midge are you selling another chrome front bumper? whats it like? how long ago was it re-chromed?
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: 18RGU issues
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Mon, 11 August 2003 22:29
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you have to take the head off to take the timing case off I thought. But also be very careful when you do this cause you can break the sump gasket. (18R-C, don't know about 18R-G)
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Location:
Canberra
Registered:
December 2002
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Re: 18RGU issues
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Mon, 11 August 2003 22:50
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RA28midge
still waiting for those pics.
When you pull out the tensioner in the end that moves if you look in and you will see a inside circlip pull it out and it should all fall apart.
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