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Location:
Mornington Peninsula
Registered:
September 2002
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Extremly high pressure in the 18R-C
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Wed, 12 November 2003 22:03
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Hello all,
I replaced my engine on the weekend then less than 40km's the head cracked. I put the old head that I knew was ok on the new block. It's all running well except the pressure inside the engine is extremly high. It's blowing oil out the bottom of the rocker cover, into the air filter case and out of the oil cap. The head has all new gaskets and we put loctite gasket goop all around it as well. When the car is running and you take the oil cap off it shoots oil and steam up higher than the bonnet.
Would this be cause by some water in the block from when the last head cracked?? we've changed the oil and I'm about to do another oil change on it. Should I run the engine at home for a while with the oil cap off to let the steam out to see if that makes a difference.
I just want to know if it's something major or something simple that's easy to fix.
Thanks
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Location:
Melbourne
Registered:
May 2002
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Location:
Canberra
Registered:
December 2002
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Re: Extremly high pressure in the 18R-C
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Wed, 12 November 2003 23:07
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Agreed excessive blowby around the piston rings which is pressurising your crankcase.
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: Extremly high pressure in the 18R-C
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Wed, 12 November 2003 23:15
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Yeah, there was a bit of blue smoke coming out the exhaust. So basically I should drive her around to the wreckers now while I can to get the best price for her. 
The engine has been re-coed at some stage in it's life. The block has been painted and it's got warrenty stickers all over it saying void if removed. 2 of the welche plugs were stuff in her though.
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Location:
Melbourne
Registered:
October 2003
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Re: Extremly high pressure in the 18R-C
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Thu, 13 November 2003 04:47
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funny story, i had my engine stripped down about 18 months ago, and discovered that when it was rebuilt (by previous owner)it had 40 thou oversize pistons with standard size rings
this equals blowby like a mother
easy fixed tho, and now no probs
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Location:
Canberra
Registered:
December 2002
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Re: Extremly high pressure in the 18R-C
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Thu, 13 November 2003 04:57
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you would think that you would notice when you were doing the rebuild what engine is that in?
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Location:
Melbourne
Registered:
October 2003
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Re: Extremly high pressure in the 18R-C
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Thu, 13 November 2003 05:47
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an 18r-c
dude, the shop it was done at mustn't of had much of a clue, the main caps (i think, they hold the crank in) were on backwards, well, 4 and 5 were, and the bolts holding 5 in were ground off at an angle, making it look like it had been draged accross the workshop floor.
and, it was held together with about 5kg of loctite.
thankfully, that has all been fixed.
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Location:
Adelaide
Registered:
June 2003
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Re: Extremly high pressure in the 18R-C
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Fri, 14 November 2003 00:30
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I anyone wants a 18R'c that has had a top end recon then We've got one that has to go soon.
Details:
Recon about 50,000 ish ago.
Bores honed
new rings
new big end bearings
valves ground
new stem seals
Full gasket kit put in
new front engine seal
basically everything that can be done without removing the crank.
The carbie is rooted (still works) but the rest is fine, it was only removed to make rooom for the 18rg.
Genie extractors and pretty performance air filter also available.
If anyone is interested, let me know
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Location:
Melbourne
Registered:
October 2003
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Re: Extremly high pressure in the 18R-C
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Sat, 15 November 2003 01:21
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when you say you put loctite on the head gasket did you mean all over the head gasket? or just arond water/oil galleries?
If you did (put it all over) it's possible the high spots from the goo could cause a leak...
Also the head you put on could have extremly shit/leaking valve stems seals. Causing combustion pressure to get into the rocker cover/whole engine.
But yeah as the others said most likely cracked piston or stuffed rings. Does it make any funny noises?
Does it sound like it's running on all 4?
One last thing, is the PCV valve connected?
If not it could help.
BUT... no matter what it is, if you just wanting to drive it:
One way around this, which worked well on a kingswood i once owned (with a cracked piston) was to get a piece of rubber pipe, about the size of the oil cap hole, and put it in the oil cap hole instead of the cap, then direct the pipe into the air intake (i just put a hole in the air cleaner and shoved it in)
Basically the massive block pressures will be vented into the carby, so all the smoke and crap you would normally see gets burnt off.. This for me stopped the dipstick from shooting out of it's tube, and got me around for 4 months, and showed no sighn of stopping.. only reason i stopped driving it was cause i had an 8 to put into it.
If too much oil droplets blows thru the tube, get a longer piece of tube and spiral it round so the oil has time to fall out of suspension.. Oherwise a loosely packed piece of steel wool will allow the air/blow by to escape, and keep the oil in the engine.
Dodgy as hell, but it works.
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Location:
Brisbane
Registered:
October 2002
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Re: Extremly high pressure in the 18R-C
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Sat, 15 November 2003 08:17
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it could also be from ovaled bores.
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Also the head you put on could have extremly shit/leaking valve stems seals. Causing combustion pressure to get into the rocker cover/whole engine.
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if it has fucked valve stem seals the pressure would have to get by the valve STEMS first, if the gas could get past with that much force then the valves wouldnt be sealing at all and it wouldnt even have pressure
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: Extremly high pressure in the 18R-C
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Sun, 16 November 2003 21:31
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When I put loctite on it was on the rocker cover gasket, dad put the head gasket on and the head while I wasn't there so I don't know about where it was applied to.
The car doesn't make any funny noises and runs really well. I'm having a bit of trouble starting it at the moment and have had to charge the batterie a few times. It's not from the starter motor and alternator cause we've checked all that out.
The head that I put on there was off the engine that I pulled out of the car. The head was all cleaned up and had a home re-co job done on it about a year ago and it never had any of those problems, that's why I think that it's got to do with the block.
Off the side of the rocker cover there is a hose that goes into the air filter which has blown a lot of oil and looks like a bit of water into there. I'm really hoping that it's just a bit of water in the oil still from when the head cracked and it's just turning to steam at the moment. I'm going to do an oil change tonight and hope that it solves the problems. But I don't know why it's hard to start either.
What sort of Kingswood did you have? I'm a bit of a fan of them, a HQ was the first car that I was ever in and we had one for years, it was the good old reliable family car. Go the red block engines!! My b/f is actually doing up a HQ wagon at the moment so I'm helping out a bit with that too. He's got the 253 sitting there to go in it.
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Location:
Melbourne
Registered:
May 2002
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Re: Extremly high pressure in the 18R-C
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Mon, 17 November 2003 00:08
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| ra23celicachick wrote on Mon, 17 November 2003 08:31 |
I'm having a bit of trouble starting it at the moment and have had to charge the batterie a few times. It's not from the starter motor and alternator cause we've checked all that out.
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I would say it spins over very easy as it has no compression! do a compression test on it im shure you will find it down!
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My b/f is actually doing up a HQ wagon at the moment so I'm helping out a bit with that too. He's got the 253 sitting there to go in it.
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eeeerrrrrrrrr *shudder* holden *spit* ditch that get a crown wagon!
Allan
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Location:
Brisbane
Registered:
October 2002
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Re: Extremly high pressure in the 18R-C
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Mon, 17 November 2003 11:20
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I would say it spins over very easy as it has no compression! do a compression test on it im shure you will find it down!
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have u tried a wet test
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: Extremly high pressure in the 18R-C
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Mon, 17 November 2003 21:18
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Long live the Kingswood Allan!  It only cost a slab of beer and it has a lot less rust and goes a lot better than my car. If only I had a Holden then I wouldn't have all these car problems 
We've got the compression test gear at home so I'll give it a go this weekend. Dad has been trying to tune it this week but he hasn't made it any better. I'll also get my b/f to have a go to see if he can make it run any better. I've got no power and it's flat spotting something fierce at the moment also. We managed to get the old engine to run with no flat spots and it did have some more power.
Wet test????
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Location:
Brisbane
Registered:
October 2002
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Location:
newcastle
Registered:
June 2003
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Re: Extremly high pressure in the 18R-C
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Tue, 18 November 2003 11:20
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ra23celicachick wrote on Mon, 17 November 2003 08:31
I'm having a bit of trouble starting it at the moment and have had to charge the batterie a few times. It's not from the starter motor and alternator cause we've checked all that out.
maybe due to the cylinders being full of water! sorry doesnt sound good mate
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: Extremly high pressure in the 18R-C
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Wed, 19 November 2003 03:29
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Well, an improvement has been made.
Car is driving very well, no flat spots, no trouble starting, no lack of power, no visable smoke out the exhaust. The crank case pressure is still blowing oil out the oil cap and around the rocker cover gasket. I know it's not the oil cap itself or the head because it never did it on the old block, only the new one.
I plan to take her on a trip up near Ballarat (Maryborough) on the weekend, about 3 hour drive. I did about 100km in her yesterday and there wasn't any issues except the oil out the rocker cover. Hopefully a long run might do the car some good. Dad is driving up there in his car so it's not like I won't be able to get home or get stranded if my car dies in the arse.
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Location:
Brisbane
Registered:
February 2003
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Re: Extremly high pressure in the 18R-C
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Wed, 19 November 2003 09:23
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hi ra23celicachick,
has someone blocked the PCV valve? or is it not working correctly? the thing in rocker cover near rear on carbi side of rocker cover... it feeds into the base of carbi.
or the breather closer to front also plugged up? (feeds directly to air cleaner from rocker cover)
sounds like crankcase not breathing correctly so the blow-by is making its way out the cap. either of these two breathers (the PCV under high vacuum, the breather under load) shold prevent oil spraying out from cap.
it might be worthwhile checking both still work, otherwise you might pop a front or rear crank seal - or get oil spraying out dipstick.
charles.
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Location:
Brisbane
Registered:
October 2002
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Re: Extremly high pressure in the 18R-C
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Wed, 19 November 2003 09:57
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| thechuckster wrote on Wed, 19 November 2003 19:23 |
hi ra23celicachick,
has someone blocked the PCV valve? or is it not working correctly? the thing in rocker cover near rear on carbi side of rocker cover... it feeds into the base of carbi.
or the breather closer to front also plugged up? (feeds directly to air cleaner from rocker cover)
sounds like crankcase not breathing correctly so the blow-by is making its way out the cap. either of these two breathers (the PCV under high vacuum, the breather under load) shold prevent oil spraying out from cap.
it might be worthwhile checking both still work, otherwise you might pop a front or rear crank seal - or get oil spraying out dipstick.
charles.
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actually this happened to my bro inlaw, his fuck wit dad saw a breather hose hanging down and a vac hose from somewhere hanging doen as well...."hmmmmmmmm, this one fits inside this one, lets put 'em together with a clamp"
no wonder it dropped all its oil
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: Extremly high pressure in the 18R-C
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Wed, 19 November 2003 21:35
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I know the one at the front of the rocker cover that feeds strait into the air filter isn't blocked because that's been pushing oil up into there. I'll have a check of the one that feeds into the carby.
Basically, what's happened is I had a pre polution engine in there (block, head, inlet) we took all that out of the car (because it was using more oil than petrol) and put a polution engine in but put the pre polution inlet back on. The head cracked on the polution head so we took that off and put the pre polution head on there that we originally took out. We never had these problems with this head and inlet on the old block, it's only the new block. Is there something not compatable with the polution and pre polution engines. Also this is why I tend to think that the problem is in the block. If it was a cracked piston or the piston rings would the car be going through a lot of oil?? It's not blowing any smoke and the only oil it looses is the bit out of the oil cap.
I'm going to take the car on a long drive this weekend and hopefully the long trip will help it settle down.
Thanks for everyones help and input 
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