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Author Topic: Corsa, Engine Problems  (Read 3510 times)

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STEMO

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Re: Corsa, Engine Problems
« Reply #75 on: 24 January 2018, 17:56:10 »

£1370 and the car was returned with no compression on one cylinder. :(
Woman owner. Sexism at its finest.
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Nick W

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Re: Corsa, Engine Problems
« Reply #76 on: 24 January 2018, 20:25:26 »

Refitting the piston is a matter of using a well lubricated piston compressor, and confidently knocking the piston through it with the same heavy hammer and block of wood you used to remove it.


I know you're doing the job for several other good reasons, but realistically it's time for a replacement engine.

My concern with a replacement engine is, will it soon suffer the same problems?

Cost wise I feel itíd be easier to fix this one :y


Those are not common problems, or a quick cheap easy fix. An engine should cost less than the necessary parts, and is much less work than reassembling what you have.


I would have taken one look at that piston(and you need to examine the others if you're keeping them) and started looking for an engine.
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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #77 on: 24 January 2018, 20:31:30 »

Refitting the piston is a matter of using a well lubricated piston compressor, and confidently knocking the piston through it with the same heavy hammer and block of wood you used to remove it.


I know you're doing the job for several other good reasons, but realistically it's time for a replacement engine.

My concern with a replacement engine is, will it soon suffer the same problems?

Cost wise I feel itíd be easier to fix this one :y


Those are not common problems, or a quick cheap easy fix. An engine should cost less than the necessary parts, and is much less work than reassembling what you have.


I would have taken one look at that piston(and you need to examine the others if you're keeping them) and started looking for an engine.

Quick or easy arenít considerations. I have all the time in the world. And I fancy a challenge. Iím finding it keeps my mind active and makes me feel better.

Cost wise,

Valves £30
Head gasket set £50
Bolts £15
Used piston £20
Ring set £40

Parts are coming in at sub £150.

Seems better to spend that and have an entirely known quantity, than some used engine thatís a complete gamble?  :-\

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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #78 on: 25 January 2018, 07:39:28 »

Whatís the best way to protect the crank journals and bores from rust while Iím away?

 coated in grease, will this do?

Car will left for ten days or so while Iím away :y
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Re: Corsa, Engine Problems
« Reply #79 on: 25 January 2018, 07:51:32 »

WD40 and cover in clingfilm :-\
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Fuse 19

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Re: Corsa, Engine Problems
« Reply #80 on: 25 January 2018, 07:56:58 »

WD40 and cover in clingfilm :-\

What he said.

Before refit polish them up with very fine wet and dry then some garnet paper or t-cut
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aaronjb

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Re: Corsa, Engine Problems
« Reply #81 on: 25 January 2018, 09:31:12 »

Boeshield T9, if you want to get fancier than WD40..
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LC0112G

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Re: Corsa, Engine Problems
« Reply #82 on: 25 January 2018, 10:12:23 »

Whatís the best way to protect the crank journals and bores from rust while Iím away?

 coated in grease, will this do?

Car will left for ten days or so while Iím away :y

I'd take the piston rings off the piston(s), cover the current little end bearings in grease and re-assemble. Also lightly grease the bores and the block face to stop them rusting (assuming its a cast iron block not ally) but remember you're going to have to get it all off again afterwards so don't go nuts with it. Or put the old CHG and head back on whilst you're away.
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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #83 on: 25 January 2018, 11:04:10 »

Didnít have time to reassemble -

Bores smeared with grease

Crank journals likewise and wrapped in Cling film

Same with mating surface

Cams smeared on grease and wrapped in film

Pistons are in the house  ::)

Best I could do, running late for flight ..
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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #84 on: 15 February 2018, 14:38:06 »

Time to resurrect this one....

Iíve just taken delivery of a lot of parts.

As Mark said assume the garage did nothing.

I have a set of new valves all round. Three new pistons with rings.

New big end bearings.

Full chain kit and sprockets / guides

Head set with bolts

Big end bearings

Thermostat

Water pump

Plus lots more

If I can get new con rod bolts, assuming the weather is good, I may get the three new pistons and rings fitted tomorrow :y

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Re: Corsa, Engine Problems
« Reply #85 on: 15 February 2018, 14:39:35 »

The wrist pins were a nightmare. Total nightmare. Destroyed the old pistons removing them.

On refitting, got the con rod silly hot with a blowtorch, and had a 2 second window to get them in right ::)
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Re: Corsa, Engine Problems
« Reply #86 on: 15 February 2018, 14:47:43 »

To remove (or fit) wrist pins you heat from inside the piston (from below).

You wont need Conrod bolts, they are not fitted that tight and certainly not to the point of creep, a little thread lock if your feeling generous.

Don't fit the sump until AFTER you have fitted the timing chain cover, seen many a leak otherwise.
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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #87 on: 15 February 2018, 14:58:23 »

To remove (or fit) wrist pins you heat from inside the piston (from below).

You wont need Conrod bolts, they are not fitted that tight and certainly not to the point of creep, a little thread lock if your feeling generous.

Don't fit the sump until AFTER you have fitted the timing chain cover, seen many a leak otherwise.

Thanks mark :y

The wrist pins are fitted now. One is a little off centre. Will this be an issue?

I imagine not, as

A) itís fixed in the conrod
b) thereís plenty of ďpurchaseĒ either side of the piston regardless of any offset either side



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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #88 on: 15 February 2018, 15:00:16 »

To remove (or fit) wrist pins you heat from inside the piston (from below).

You wont need Conrod bolts, they are not fitted that tight and certainly not to the point of creep, a little thread lock if your feeling generous.

Don't fit the sump until AFTER you have fitted the timing chain cover, seen many a leak otherwise.

Due to the engine mount and need to support the weight of the engine I will have to

A) loosely refit sump after fitting pistons

B) support weight, remove engine mount

C) refit timing gear, cover etc

D) fit and seal sump properly :y

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JamesV6CDX

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Re: Corsa, Engine Problems
« Reply #89 on: 15 February 2018, 17:20:53 »

Just for clarity. This setup is such that the wrist pin is firmly pressed into the con rod, but runs freely on the piston skirt. So the rod can move side to side inside the piston skirt
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