Timeline for Broken spark plug: safe piston?
Current License: CC BY-SA 4.0
26 events
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| Dec 14, 2018 at 3:00 | history | tweeted | twitter.com/StackMechanics/status/1073412392929935360 | ||
| Dec 12, 2018 at 21:47 | history | edited | Pᴀᴜʟsᴛᴇʀ2♦ | CC BY-SA 4.0 |
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| Dec 12, 2018 at 16:02 | comment | added | user2284570 |
@motosubatsu got the answer. Top of piston is damaged because it repeateadly thump the exhaust valve, I have no idea if it will resists if presure come again in the cylinder. Found how to get the job done for 48€ per labour hour. But it seems to be difficult to find a 2SZFE engine manufactured after 2004 (euro ⅳ standard) in good shape below 500€. What are the differences between a2SZFEmanuactured before 2005 and a2SZFEmanufactured after 2004 ? Is it just the ᴇᴄᴜ or are there other additional equipments?. I don’t want an emission standard downgrade (the car was manufactured in 2007).
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| Dec 12, 2018 at 14:05 | vote | accept | user2284570 | ||
| Dec 11, 2018 at 13:19 | comment | added | motosubatsu | if it's part of the electrode that's broken off then unless you got extremely lucky and it exited right out through the exhaust valve it's going to have done some damage inside the cylinder. Hence the loss of compression, then engine is likely uneconomical to repair - best option at this point IMO is a straight swap for another. €200-300 for a complete unit on ebay and swap the lot. Depending on labor rates you should be able to get the lot done for less than €1000 | |
| Dec 10, 2018 at 18:32 | comment | added | user2284570 | @motosubatsu a special tool is required to unswrew the plugs so I can’t tell exactly. but according to Toyota it’s just a part of the top Electrode which broke off as previous owner (born in 1995) used low cost models which aren’t designed to resists higher burning temperatures of lpg. He also followed manufacturer’s recomendations for heat range instead of taking a colder design for the lpg tranformed engine. | |
| Dec 5, 2018 at 20:54 | history | edited | user2284570 | CC BY-SA 4.0 |
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| Dec 5, 2018 at 13:58 | comment | added | motosubatsu | @user2284570 which bit of the spark plug broke off? | |
| Dec 5, 2018 at 13:49 | comment | added | user2284570 | @motosubatsu especially since I didn’t run without the spark. The broken spark plug was still fixed correctly in the engine. Only a tiny part on top of the engine was broken. So if there’s no compression, it’s because something else is broken, but not the spark plug. | |
| Dec 5, 2018 at 13:44 | comment | added | motosubatsu | No compression in the damaged cylinder? It's toast. | |
| Dec 5, 2018 at 13:36 | comment | added | Steve Matthews | Then that tells you everything you need to know; pull the cylinder head off. After 3,000km, it isn't safe to assume any of it will be serviceable including the block itself. | |
| Dec 5, 2018 at 13:34 | comment | added | user2284570 | @SteveMatthews 12 bars in all other cylinders. absolutely no compression in the damaged cylinder. | |
| Dec 5, 2018 at 13:32 | comment | added | Steve Matthews | Whats the compression test reading compared to the other cylinders? | |
| Dec 5, 2018 at 13:29 | comment | added | user2284570 | @SteveMatthews about compression : as I wrote on the question, there’s no problem on fuel admission, but there’s a problem on exhaustion. | |
| Dec 5, 2018 at 13:27 | comment | added | Steve Matthews | This site isn't for shopping advice but you can buy a bore scope yourself that plugs into your smart phone for about 15 minutes worth of repair shop time. Have they compression tested it? | |
| Dec 5, 2018 at 13:26 | comment | added | user2284570 | @SteveMatthews the toyota repair shop I went to proposed to unmount the cylinder head directly in only 2h30 (but in taking more than 100€ per labour hour so taking almost 300€ for the operation). The second repair shop (which is independent) offer 48€ per T2 labour hour but want me pay 150€ for the bore scope inspection. That’s why I don’t see that much benefits. | |
| Dec 5, 2018 at 13:22 | comment | added | Steve Matthews | You can definitely get a bore scope down the spark plug hole. | |
| Dec 5, 2018 at 13:21 | comment | added | user2284570 | @SteveMatthews I am afraid the cylinder head needs to be unmounted in order to see something. | |
| Dec 5, 2018 at 13:13 | comment | added | Steve Matthews | Have you seen the bit of spark plug on a bore scope? | |
| Dec 5, 2018 at 13:00 | comment | added | user2284570 | @alephzero I am wondering if it is possible the broken spark part could just get aspirated in the exhaust poppet valve by just breaking at the right moment. I have an insurrance on mechanical damages. But it only pays repairs if the engine can’t run anymore (since the engine can work on 3 cylinder this isn’t the case here). | |
| Dec 5, 2018 at 12:57 | comment | added | alephzero | The problem is that a piston with a scratch in the crown from the bits of broken plug bouncing around will work just fine - until the day when it breaks into two pieces, one of which comes out of the side of the engine block. It's your call whether you want to pay 150€ "insurance" against that. | |
| Dec 5, 2018 at 12:50 | history | edited | user2284570 |
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| Dec 5, 2018 at 12:49 | comment | added | user2284570 | @kokobill the repair shop want to make me an additional 150€ for inspection of the piston while a more expansive repair shop don’t think it’s required. | |
| Dec 5, 2018 at 12:39 | answer | added | motosubatsu | timeline score: 3 | |
| Dec 5, 2018 at 12:38 | comment | added | kokobill | Why don't you just fix the problem now, before it gets worse over time? | |
| Dec 5, 2018 at 12:24 | history | asked | user2284570 | CC BY-SA 4.0 |