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Author Topic: Corsa, Engine Problems  (Read 4570 times)

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Nick W

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Re: Corsa, Engine Problems
« Reply #45 on: 23 January 2018, 22:05:30 »

Where do you stop?


Well I wouldn't have got anywhere near that far into it, even though I have the equipment to do so. I certainly wouldn't be fitting new rings unless the old ones were actually damaged, and would probably leave the bearings alone too.
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Kevin Wood

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Re: Corsa, Engine Problems
« Reply #46 on: 23 January 2018, 22:46:13 »

I really have trouble imagining that a modern engine with less than 80k on the clock will have bottom end problems, TBH.
If the bores looked OK, I think I'd lap some new valves in and see what happens.
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Shackeng

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Re: Corsa, Engine Problems
« Reply #47 on: 23 January 2018, 22:50:04 »

I really have trouble imagining that a modern engine with less than 80k on the clock will have bottom end problems, TBH.
If the bores looked OK, I think I'd lap some new valves in and see what happens.

Although the garage work was suspect, I probably wrongly, had hoped that they ensured all valves lapped in when the head was off. :-\ :-\ :-\
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Andy H

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Re: Corsa, Engine Problems
« Reply #48 on: 23 January 2018, 23:28:59 »

Low compression on Rover V8s is often (nearly always?) due to the camshafts wearing so badly that they don't open the valves much.

Probably not relevant to the Corsa but I think it is worth having another quick look at the lobes on the camshaft(s). Also have a look at cam followers.

I suppose another possibility is that someone drove through water and got enough water in no3 to bend a con-rod :-\
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LC0112G

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Re: Corsa, Engine Problems
« Reply #49 on: 23 January 2018, 23:43:17 »

Where do you stop?


Well I wouldn't have got anywhere near that far into it, even though I have the equipment to do so. I certainly wouldn't be fitting new rings unless the old ones were actually damaged, and would probably leave the bearings alone too.

Well normally yes, I'd agree. But AIUI James isn't trying to just get the car running again as quickly and cheaply as possible. He's treating it as a learning experience to help his recouperation and keep his mind active. So nothing wrong with pretending its a Rolls Royce or Ferrari engine, and doing everything "properly".

If the rings and bearings are good then re-use, but unless you check them you won't know for sure if they are Ok. Cyl #3 sounds like either top or middle compression ring is gone?

There is no info on the state of Cyl #1's rings since the valves didn't allow compression. So it's a risk to assume there is nothing wrong with the rings on Cyl #1. I accept they probably will be, but if they're not you'll have to strip it all down again (another CHG, set of head bolts etc) if/when you find out they aren't Ok.

So for the cost of a set of con rod bolts it seems sensible to me to take out all 3 pistons and check all the rings, pistons, bores and bearings. Look for damage, check the ring gaps, and use some plasti-gauge (couple of quid off eBay) to check the bearing clearances.
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Doctor Gollum

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Re: Corsa, Engine Problems
« Reply #50 on: 23 January 2018, 23:50:11 »

As an idea, buy a new long engine and flog the car, then rebuild the old engine as an interesting project ;)
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Fuse 19

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Re: Corsa, Engine Problems
« Reply #51 on: 24 January 2018, 08:04:30 »

I would check that head properly, the previous garage have clearly only 'replaced a valve or two' and not properly stripped it, checked it and lapped the valves (you may find one sticking a bit or it wont lap in, plus it can be done sat at a bench). Work on the basis they never touched it (as clearly it was shoddy work!)

These units are not known for ring or bore wear plus bore wear would be easy to spot with your finger, any ring issues and it would smoke and be using oil in my mind (maybe it was?).

I assume all the inlet etc are clear with no blockages?

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Shackeng

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Re: Corsa, Engine Problems
« Reply #52 on: 24 January 2018, 10:12:19 »

I would check that head properly, the previous garage have clearly only 'replaced a valve or two' and not properly stripped it, checked it and lapped the valves (you may find one sticking a bit or it wont lap in, plus it can be done sat at a bench). Work on the basis they never touched it (as clearly it was shoddy work!)

These units are not known for ring or bore wear plus bore wear would be easy to spot with your finger, any ring issues and it would smoke and be using oil in my mind (maybe it was?).

I assume all the inlet etc are clear with no blockages?

I agree, and the same would apply with a cracked block. As above, it sounds like rings and/or valves, and a check of all cylinders, rings and bores would exclude them as issues. :y
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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #53 on: 24 January 2018, 10:42:54 »

Iíve found the problem on no3  ::)

Itís quite visible.

Iíll post a full update a bit later, with photos, but need to go and shower.

In the meantime you can take guesses at what I found ;)

No more work will take place for 10 days now, as Iím off to sunny canaries tomorrow :y
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STEMO

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Re: Corsa, Engine Problems
« Reply #54 on: 24 January 2018, 11:07:54 »

Iíve found the problem on no3  ::)

Itís quite visible.

Iíll post a full update a bit later, with photos, but need to go and shower.

In the meantime you can take guesses at what I found ;)

No more work will take place for 10 days now, as Iím off to sunny canaries tomorrow :y
Never mind a bit later...tell us now!  >:(
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STEMO

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Re: Corsa, Engine Problems
« Reply #55 on: 24 January 2018, 11:08:33 »

My bet is a valve problem, BTW.
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henryd

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Re: Corsa, Engine Problems
« Reply #56 on: 24 January 2018, 11:31:03 »

Iíve found the problem on no3  ::)

Itís quite visible.

Iíll post a full update a bit later, with photos, but need to go and shower.

In the meantime you can take guesses at what I found ;)

No more work will take place for 10 days now, as Iím off to sunny canaries tomorrow :y

Burnt piston ::)
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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #57 on: 24 January 2018, 11:40:03 »

So, here are just a couple of the strip - down:





Here, is a photo of the obvious cause of compression loss on Cyl #1 - Hole in an exhaust valve:



Here, are pictures of what I believe to be the cause of low compression on cyl #3:










Its Piston Broke - Just like me :D
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Re: Corsa, Engine Problems
« Reply #58 on: 24 January 2018, 11:51:18 »

Yup, that'll do it! Broken ring & ring lands, by the look of it.

Running very lean, perhaps? Detting it's nuts off and knocked a hole in the valve & piston on opposing cylinders?

Look at all that space, though. Almost as if someone stole 1/4 of the engine ;D
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Fuse 19

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Re: Corsa, Engine Problems
« Reply #59 on: 24 January 2018, 11:52:36 »

That burnt valve could be due to the cylinder imbalances caused by the piston  :y
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