Generation
Member
Registered: 7th Jul 09
Location: Essex
User status: Offline
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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looks like there is a few chips out of them?
i'd say no, but im no expert
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Generation
Member
Registered: 7th Jul 09
Location: Essex
User status: Offline
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Quite abit of it is debris from valves tbh..
Incan clean up with magnet, and solvent Incan use aswell?
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BarnshaW
Member
Registered: 25th Oct 06
User status: Offline
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why not just replace for peace of mind? its not worth something risking to be honest, are they out of a failed engine?
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Generation
Member
Registered: 7th Jul 09
Location: Essex
User status: Offline
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They aren't standard pistons and would rather keep cost down ideally. From
A c20xe engine thT had its woodruff key snap and bent 16valves
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alan-g-w
Member
Registered: 9th Nov 07
Location: Glasgow
User status: Offline
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There's always going to be the chance of a bit of wekened metal chipping out when running. If it wasn't the top of a piston I'd be suggesting dressing the marks out with emory paper. I wouldn't be risking using them/ it
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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replace them, as barnshaw says not worth the risk,
could spend ages rebuilding the engine for a bit of the piston to break off after the first turn of the key and then have to rebuild again
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Ben G
Member
Registered: 12th Jan 07
Location: Essex
User status: Offline
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not worth keeping them. you've spent so much on the car so may aswell spend some more than risk ruining the engine again.
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Crana
Member
Registered: 20th Jan 09
Location: Newcastle
User status: Offline
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I say get someone who knows what there doing to rebuild that engine...
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Ryan_G1
Member
Registered: 29th Aug 05
Location: East Ayrshire
User status: Offline
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They will be fine.
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Dave
Member
Registered: 26th Feb 01
Location: Lancs
User status: Offline
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I reused mine after a similar piston/valve head butting session but I had no fragments in the bores, just some slight marking on the top.
At the very least I'd be dropping the pistons out to ensure the bores are clean.
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John
Member
Registered: 30th Jun 03
User status: Offline
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Will you take the advice when it's offered or just do what you want anyway?
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Generation
Member
Registered: 7th Jul 09
Location: Essex
User status: Offline
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Here we go with the CS again
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gez bay
Member
Registered: 14th Feb 08
Location: South Wales drives: Vxr
User status: Offline
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They look fine, I reused mine on my 172 after a slipped timing belt, the marks will clean up.
There's no nasty marks on yours either, keep them.
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Ryan_G1
Member
Registered: 29th Aug 05
Location: East Ayrshire
User status: Offline
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I've fixed hunrededs of cars with broken belts, snapped woodruff keys and never changed the pistons. The folk saying change them obviously don't have a clue.
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gez bay
Member
Registered: 14th Feb 08
Location: South Wales drives: Vxr
User status: Offline
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As above^
Keep them!
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Generation
Member
Registered: 7th Jul 09
Location: Essex
User status: Offline
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This is why John, it's good to get opinions.
I was asking because I didn't know.
Just like the thread in help, I was bei told to tey different things by lots of different people. If I dot know, obviously makes sense to
Me to try the easier things that have been suggested.
I have some people here saying keep some saying replace. I will have to ignore SOMEBODY'S advice
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gez bay
Member
Registered: 14th Feb 08
Location: South Wales drives: Vxr
User status: Offline
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Ignore the advice to throw them
If you do throw them your wasting money
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Ryan_G1
Member
Registered: 29th Aug 05
Location: East Ayrshire
User status: Offline
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Plus it looks like a bit of a valve guide on the top of the piston in the second pic. Its more than likely they will all be damaged
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Generation
Member
Registered: 7th Jul 09
Location: Essex
User status: Offline
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Yeah, the valve guides and valves(obviously) will all be replaced.
I can get fragments off pistons with a magnet. I that makes easier for you to see
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Ryan_G1
Member
Registered: 29th Aug 05
Location: East Ayrshire
User status: Offline
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Just get all of the bits off of the top of the pistons and that's all you need to do. They will be fine. It's honestly something I wouldn't be worrying about
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Ben G
Member
Registered: 12th Jan 07
Location: Essex
User status: Offline
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quote:
Originally posted by Ryan_G1
I've fixed hunrededs of cars with broken belts, snapped woodruff keys and never changed the pistons. The folk saying change them obviously don't have a clue.
piss taker.
i work in a factory where engines are produced. i'm sick of the sight of them.
i regularly go over and have a look at my mate stripping down fucked engines and seeing the damage caused. usually it's one small part that causes big damage, hence why i wouldn't risk pistons that could be fucked on an engine build that generation has spent thousands of his hard earned on.
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Ryan_G1
Member
Registered: 29th Aug 05
Location: East Ayrshire
User status: Offline
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quote:
Originally posted by Ben G
quote:
Originally posted by Ryan_G1
I've fixed hunrededs of cars with broken belts, snapped woodruff keys and never changed the pistons. The folk saying change them obviously don't have a clue.
piss taker.
i work in a factory where engines are produced. i'm sick of the sight of them.
i regularly go over and have a look at my mate stripping down fucked engines and seeing the damage caused. usually it's one small part that causes big damage, hence why i wouldn't risk pistons that could be fucked on an engine build that generation has spent thousands of his hard earned on.
Ok then you obviously know everything so I shall start changing the pistons every time I repair a car with a broken belt. I thought I should have known this after nearly 10 years of being a mechanic...
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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With this kind of damage I have seen problems with engines burning oil due to the ring lands closing up ad pinching the rings due to the valve impact. Also in one case i have seen a rebuilt engine suffer from Conrod failure having been rebuild from a Cambelt failure.
Those are worse case, what pistons are they? Chances are you will have no problems.
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Mattb
Member
Registered: 2nd Feb 03
Location: Under your sisters bed
User status: Offline
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Chances are they will be fine - it will be worth removing them, cleaning them properly and checking for distortion in the ring lands, any cracks etc.
if theres any major damage on top that could cause hotspots, andy cracks or distortion chuck them, if not - reuse
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