Pistons hit valves
Moderator: Fatmobile
Pistons hit valves
Timing belt broke so pistons hit valves. Would you reuse pistons that have a valve stamp on them?
'83 diesel vanagon
'85 diesel Jetta
'86 diesel Golf
'85 diesel Jetta
'86 diesel Golf
Re: Pistons hit valves
Here's cylinder #1
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'83 diesel vanagon
'85 diesel Jetta
'86 diesel Golf
'85 diesel Jetta
'86 diesel Golf
Re: Pistons hit valves
That looks like a really hard kiss. I'd recommend that you have a machine shop dye test the pistons to see if they can find any cracks, after you meticulously inspect the piston yourself. It also looks like your piston has some errosion from a dripping injector. Pull it out and inspect everything carefully and make a decision on whether to get a machine shop involved or just find another set of pistons.
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Re: Pistons hit valves
It's hard to see from the pic, but the valve smashed part of the edge of where the fuel mixes on top of the piston. I'll take a closer look.
Thanks again!
Thanks again!
'83 diesel vanagon
'85 diesel Jetta
'86 diesel Golf
'85 diesel Jetta
'86 diesel Golf
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Re: Pistons hit valves
You might check the piston protrusion.
Have a nice day.
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'91 Jetta ECOdiesel TD - clean & complete (less motor/tranny) for sale
'82 Westy Vanagon 1.9 N/A - 23.5mpg
'86 Jetta TD - 45-50mpg
'81 Dasher Wagon 1.6 N/A - 52mpg
'84 Wasserboxer - DOA, parts donor
'94 Passat wagon VR6
'03 Jetta TDI wagon 230K, 52.3mpg
'89 Jetta N/A - 51mpg
'82 Caddy 1.6 N/A - Sold
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Re: Pistons hit valves
If you look closely you will see concentric rings. No rings on the valve face, so it's not one big thump but many smaller thumps; at least until the belt gave out.
As per Tyler; bring up piston to TDC to check for protrusion reduction on this particular piston...
If none apparent, then rod fine, or near fine.
Check true depth of crater, as it may be less than it looks. Remove crater ridge then play on....
As per Tyler; bring up piston to TDC to check for protrusion reduction on this particular piston...
If none apparent, then rod fine, or near fine.
Check true depth of crater, as it may be less than it looks. Remove crater ridge then play on....
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Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)
Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.
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Re: Pistons hit valves
it would be ok to reuse, but you'll need to measure piston protrusion to make sure the rods are not bent. Also you should pull the piston out and make sure no metal is mushroomed from the impact and going to scratch up the cylinder wall.
Richard
85 Jetta TD
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85 Jetta TD
ASE Certified Master Auto-Technician with L1 Advanced Engine Diagnostic Rating and Light Diesel certification
ATRA Certified in Rebuilding, Diagnosing & Installing Transmissions
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Re: Pistons hit valves
The engine rotates smoothly by hand. I still have to pull the pistons for inspection. Thanks for the tips!
'83 diesel vanagon
'85 diesel Jetta
'86 diesel Golf
'85 diesel Jetta
'86 diesel Golf