mar_cus
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Registered: 29th Apr 09
Location: Congleton, Cheshire
User status: Offline
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quote:
Originally posted by evo_69
mine did this exact thing wheni removed my inlet manifold and putting it back on trapped the breather pipe that goes round the back of the engine...have you checked that?
Which breather pipe mate? The breather pipe from behind the engine is metal isnt it?
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evo_69
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Registered: 31st May 10
Location: Derbyshire
User status: Offline
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if you look on the right hand side of your rocker cover theirs two breathers, a thick one and a thinner one...the thinner one goes down past the throttle body and behind back of the engine when i put my inlet manifold i trapped this pipe with my inlet double check that mate cause mine was doing the same thing.....
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mar_cus
Member
Registered: 29th Apr 09
Location: Congleton, Cheshire
User status: Offline
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quote:
Originally posted by evo_69
if you look on the right hand side of your rocker cover theirs two breathers, a thick one and a thinner one...the thinner one goes down past the throttle body and behind back of the engine when i put my inlet manifold i trapped this pipe with my inlet double check that mate cause mine was doing the same thing.....
Ive got this one going to atmosphere mate, i read about it somewhere on here! Where is it origonally meant to go? i've forgotten!
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frainey
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Registered: 12th Jul 10
Location: Leigh, Lancs
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dont know if uve solved the problem and this may sound silly but did you put the headgasket on right way up?
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mar_cus
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Registered: 29th Apr 09
Location: Congleton, Cheshire
User status: Offline
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quote:
Originally posted by frainey
dont know if uve solved the problem and this may sound silly but did you put the headgasket on right way up?
There is a picture of the headgasket on from my progress thread. I can't see how it could go any other way?
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mar_cus
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Registered: 29th Apr 09
Location: Congleton, Cheshire
User status: Offline
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Update:
Ran the engine in today as advised by lee303, and the pressure has gone down slightly, but it may just be my head!
Go a video of the pressure release anyway, so you can see that...
http://img860.imageshack.us/i/ip7.mp4/
So, any more ideas? lol!
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lee303
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Registered: 1st Jul 08
Location: under the nova usually
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well, you need to do a compression test as it is, then drop a couple of drops of oil down each bore and test again, do one at a time, don’t oil all four pots then start testing, and remember to hold the throttle wide open when you do it and disconnect the ecu so it doesn’t fire fuel in while you’re testing, or even better if you know a mechanic who has one do a leakdown test instead, way more informative
does to me look like the rings haven’t sealed properly though, and as i said earlier without taking it apart to measure you won’t be able to say for sure why
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mar_cus
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Registered: 29th Apr 09
Location: Congleton, Cheshire
User status: Offline
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Hey, didn't want to make a new thread as seen as its all related to my initial post...so here it goes...
So I cracked open the engine to drop the pistons out and check the gaps were staggered.
Pistons 2 and 3 where fine, all the end gaps measured up to 0.4mm out of a maximum of 0.5.
Pistons 1 and 4 seemed to be not as well staggered, which made be believe this was my problem from what people have already suggested. Then I went on to measure the end gaps every ring was fine apart from the 2nd compression ring. One ring measured 0.9mm and the other measured 0.6mm - meaning they were 0.1 and 0.4mm out...how much of an effect will this have? I mean...this is such a ridiculously small amount!
Anyway the engine is built back up again, for more testing etc. but the pressure build up is still there, although it does seem to be not as much!
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AlexW
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Registered: 25th Oct 08
Location: Essex
User status: Offline
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Staggered gaps is pointless, piston rings spin.
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mar_cus
Member
Registered: 29th Apr 09
Location: Congleton, Cheshire
User status: Offline
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Well i spoke to SBD today, very helpful just to point out.
And he mentioned that the 0.1 and 0.4 difference will mean anything, and he said the staggering does matter because if they are lined up you will just have a gap where you will loose compression.
So yeah, I need new piston rings. I measured the rings that were dodgy in each cylinder just to make sure the bores weren't shot, and they all measure the same. So yeah....
Where is the best place to get a decent set of rings that will fit....which are cheaper than vauxhall!
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DannyB
Premium Member
Registered: 6th Feb 08
User status: Offline
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Moving this to help zone shortly
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mar_cus
Member
Registered: 29th Apr 09
Location: Congleton, Cheshire
User status: Offline
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quote:
Originally posted by DannyB
Moving this to help zone shortly
Go for it bud, i did post in there originally - i just didn't get as much feedback as I did in here. Didn't mean to be a pain!
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DannyB
Premium Member
Registered: 6th Feb 08
User status: Offline
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Not a pain mate 
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