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Location:
Hobart, TAS
Registered:
July 2002
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Mysterious oil leak - 18R-G
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Mon, 09 September 2002 11:17
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I have a bad oil leak in my 18R-G only when its running, its coming out under the carbys
area, oil all over that flat part that says 18R on the block, ive
eliminated oil filter, oil switch, that thing that plugs up where the
dizzy goes on a 18R-C, the only thing left that i can see that it might be is the the
head gasket,
is it possible for the head gasket to leak out that much oil, and
the head gasket is new coz the motor is rebuilt.
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I supported Toymods
Location:
Oyster bay NSW
Registered:
May 2002
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 Re: Mysterious oil leak - 18R-G
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Mon, 09 September 2002 23:49
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There is a small metal plate that is just under the carbs from memory  that has a gasket around it, and only two bolts, if it has been over tightened the gasket split's out and the pressure in the block from blow by/ venting, will force oil out every were.
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Location:
Hobart, TAS
Registered:
July 2002
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Re: Mysterious oil leak - 18R-G
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Tue, 10 September 2002 07:03
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Do you mean the plate on the side with the little pipe moulded in, for crankcase venting isnt it, i dont think thats leaking. I think it might be leaking oil wear the head gasket meets the timing chain cover
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Location:
Toowoomba
Registered:
May 2002
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Re: Mysterious oil leak - 18R-G
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Tue, 10 September 2002 07:07
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do you think maybe there is oil vapours coming from the pcv pipe coating everyting. You be supprised how that little bit of oil vapour builds up. Get an oil catch can or a piece of hose to vent it under the car.
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Location:
Hobart, TAS
Registered:
July 2002
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Re: Mysterious oil leak - 18R-G
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Tue, 10 September 2002 08:26
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No its not vapours, theres alot of oil coming out somewhere on the carby side, i still suspect its the oil switch but not sure, i took the oil switch out and had a look and it seemed ok, also my oil light is coming on a far bit but the oil level is full but slowly decreasing coz of the leak.
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Location:
Newcastle
Registered:
May 2002
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Re: Mysterious oil leak - 18R-G
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Tue, 10 September 2002 10:49
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there is a small plate wit 1 bolt in it beside the engine number it is for the oil pump shaft and the small gear that operates it that has an oring sealing it and that could be the cause.
also down below that there is a sheet metal plate the one crostek was talking about with a cor gasket nd 2 bolts holding it on. i would spray the whole engine with degreaser and clean it thouroughly and then go for a short drive and see where it is leaking.
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Location:
Hobart, TAS
Registered:
July 2002
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Location:
Newcastle
Registered:
May 2002
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Re: Mysterious oil leak - 18R-G
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Tue, 10 September 2002 12:09
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yes i know the one you are talking about and yes there definately is meant to be a bolt in there and it is meant to be put in with gasket sealant as it goes right into the timing cover and oil can flow through it if the bolt isnt there. but you will have to try and ge the right length bolt as there is a cam chain dampener right infront of the bolt and you dont want to hit that.
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Location:
Hobart, TAS
Registered:
July 2002
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Re: Mysterious oil leak - 18R-G
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Tue, 10 September 2002 12:27
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Ok thanks alot man, this must be where the oil is coming from, do you know what length and size this bolt is so i can go to my bolt supplier tomorrow to get one.
thanks again.
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I supported Toymods
Location:
Oyster bay NSW
Registered:
May 2002
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Re: Mysterious oil leak - 18R-G
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Wed, 11 September 2002 01:15
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Its a 8mm bolt about 10mm to 15mm long and as Celica_RA40 said if you use one to long it will hit the timming chain the bolt helps hold the timing cover on, and seal the metal engine block plate to the timing cover.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Mysterious oil leak - 18R-G
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Thu, 12 September 2002 06:45
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i have a similar style of leak on my 18RGU, howver i think its coming from my timing chain tensioner... how hard is it to replace the o-ring that sits in tehre?
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Registered:
July 2002
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Re: Mysterious oil leak - 18R-G
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Fri, 10 January 2003 04:57
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I have got a rather large leak in my rebuilt 18R-G and I have traced it to be coming from firstly from the oil filter housing
(which i fixed by tightening the 3 bolts) and secondly (fucking wierd) the bottom of my fuel pump. It throws oil all over the right side of my engine bay under the carbies. It's a steady drip only but when the fan starts throwing it around it ends up everywhere. I end up with a pool under my car after even a short 5 minute drive. Anyone come across this before? gonna double check but definitely seems to be coming from the bottom of the fuel pump. Also any suggestions on a fix would be nice. car is practically undrivable.
email: martin@helica.com.au
mob: 0414 817 013
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Location:
Canberra
Registered:
May 2002
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Re: Mysterious oil leak - 18R-G
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Fri, 10 January 2003 07:07
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Yeah the chain tensioner o-ring is a problem with these engines!
i took mine out to try and replace it but could never find one that would fit it properly!
I have a temp fix tho, it sounds dodgy but it definently worked on my old 18RG.
Undo the tensioner a few turns so the hole in the end of it has fair bit of clearance. then pump it full of silastic, and let it dry before you re-tension it again!
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Registered:
July 2002
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Re: Mysterious oil leak - 18R-G
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Fri, 10 January 2003 08:06
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Mine's got a little drip out of the tensioner nothing too bad but the major leak is coming out of the bottom of the fuel pump. You'll find that an 18R-G original fuel pump is different to an 18R-C one in that the bottom is not sealed. Some seal in the fuel pump is screwed and it's pissing the oil out. I've decided to block the block off at the fuel pump hole with a plate and am switching to an electronic fuel pump.
Can you be a bit clearer about the silastic thing you said? I don't quite know where you squirt it in(although yes it does sound very very dodgy) 
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Location:
Canberra
Registered:
December 2002
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Re: Mysterious oil leak - 18R-G
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Fri, 10 January 2003 08:33
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If you ever have problems with o'ring try and get aircraft grade ones these come in just about any size that you want and most aircraft places have a fairly comprehensive supply but you need to go to small workshops that deal with mainly piston engines the part numbers are generally
MS-28775-xxx for hydraulic o'rings and
MS-29517-xxx for fuel (i think from memory)
the xxx are the sizings and cross wall thickness.
The bolt that your missing is the same as a 18R-C so if youve got one lying around have a look at it. Youve got to be careful with silastic cause the oil tends to soften most brands.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: Mysterious oil leak - 18R-G
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Mon, 13 January 2003 03:34
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My 18RG had the same problem witht he timing chain tensioner. Couldn't get a new one at the time, so I came up with some devious way of fixing it. I would fill you all in on the fix, but that was about 5 or 6 years ago and I really can't remember.
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