The car is a 2006 jetta tdi diesel 1.9 turbo. The engine siezed up due to a broken valve. Yes I know this was probably due to a earlier TB failure. I removed the head and have ordered a new one complete with valves. oem spec. The # 4 piston has some damage from the valve hitting it. It doesent appear to be cracked just scarred slightly. All cylinders protrude the same distance. Slightly less than spec. not much. just a few thousands of an inch. Should I replace the piston? Or can i keep using it? i have not removed the engine from the car and really don't wish to do so. I'm trying to get away with only doing the top end. Am i asking for trouble later??
If the piston hit and is scared then something else connected to that piston also might have been damaged or bent, I would have to consider the condition of the connecting rod try rotating the crank shaft and ensure the piston in question is moving freely and is topping off at the same distance as all other pistons. If it was me and I am investing all the money and time I would pull the engine out and do a complete inspection tear down and Assembly lubing every thing if it had a blown head gasket doing the head only will be ok. I have seen connecting rods broken or bent, or cracked form water damage or flooded cars
Here's the scoop.
Underneath that piston is a wrist pin, and then a connecting rod, and then a bearing that goes around the crankshaft. The bearing is split into two pieces, upper and lower. Some folks have put the engine together, as you wish to do. The top of the piston is engineered to be a certain way. if there is a tiny imperfection, what might (maybe) happen is pre-ignition, if that part of the piston heats hotter than the surrounding surface, and will cause the engine to run poorly. Next, if the valve hit the piston, there might be some tiny damage to the connecting rod, the wrist pin, or mainly, the bearing on the crankshaft. Probably all you would see is the engine would throw a rod in the next 5,000 miles, or sooner.
I share your desire to save money and time on this. If you decide to button it up, please take some fine sandpaper and a good shop vacuum and try to smooth the imperfections in the top of the piston and vacuum all dust and shavings up as you work.
Be blessed.
SOURCE: Volkswagen jetta TDI engine locked up remove and replace engine
The only special tool I can think of is a big box of band-aides........
If you've changed a motor before then you know what you're doing.
Good luck, and make sure there are no kids around when you start cursing..lol
SOURCE: no compression in one cylinder
Timing belt slipped around cam pulley. Take off your timing belt cover and check the position. This would explain misfiring and compression loss. Stretched belt or missing cogs in belt likely culprit.
SOURCE: 2006 volkswagon timing belt jetta tdi turbo diesel
i can walk u through doing a t belt. But if u are not sure if u are able to do it DO NOT DO IT cause if u are wrong if cause a lot of engine damage.
SOURCE: 2000 camry. blown head gasket (daughter drove car
Yes, you can, but not exactly recommended. If you are going to go that deep into it, then might as well do everything else. However, being unemployed tends to have a negative impact on the wallet....
I suspect it is more than just rings. I think that the walls have been scored badly as well. You may be able to use a borescope to take a peak into the cylinder through spark plug hole. Move the piston to bottom of stroke, and see what you can see. If scarred, much work will be needed. If hatches look alright, then you might be able to get away with just rings.
What kind of compression are you getting on #1 vs #2? This also might be a blown headgasket into an oil passage, or the head (perhaps block?) is ever so slightly warped in this area.
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SOURCE: 02 VW Jetta TDI with ALH engine glow plug
this is a common problem for these cars glow plugs go bad like spark plugs however the smoke would lead to bad mass airflow meter. it is not telling ecu corrcet miss. disconnect mass airflow meter. when cold see if this makes it start better. it should would means you need new m.a.f. glow plug issue take a test light place clamp on positive of battery then pull off glow plug connectors place tip of test light on glow plug the bad one will have a dull light unlike the good one which will be brighter. will need new plugs and wire harness four **** connectors and wire striper and crimper will fix concern good luck
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