I've heard stories of pistons cracking and **** stemming from small dings like this before. I guess I can't tell how deep the marks are, but what does an ABA bottom end cost, $50? Better safe then sorry imo
Received a free ABA motor and was told it had valve damage. He told me that the crank bolt snapped, he cranked the motor couple times and nothing. I guess the 4 bend valves happened since he had a 262 cam. So I pulled the Cyl. Head to see the damage.
4 Valves will need to be replaced but I also noticed indentations on the pistons.
Pics show damage on all cyl.
I turned the bottom by hand and it seems that is turning ok, no problem.
My question is, is this bottom end usable? Meaning, if I just replace the valve and put it all together, will it run just fine despite the nicks in the pistons?
Thanks for the help
i would measure piston protrusion, and then run it if everything checks out. as long as the pistons are all the same height.
those marks look like the valves didnt even contact the pistons hard.. file down any sharp edges, and run it i say..
ive seen diesels munch valves and pre-chambers, and they had pistons much worse looking than those, and still ran fine..
what do you think they do at the auto shop when you bring in a jetta with a snapped t-belt? throw new pistons in there cause one COULD be cracked? dont think so..
there gonna file down the marks, so theres no hot spots while running, throw a new head, and head gasket in, and fire it back up and tell you its fixed..
I'll second what Glegor said. I've never changed pistons on an engine that bent valves due to a broken timing belt. Fix the head and install it, you'll be fine.
1998 GTI 2.0
1993 Jeep ZJ 4.0
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yea if they hit lightly it my not be enough to bend valves but if under high rpm the centrifical force of the motor say at 6grand then i woud assume the belt breaks for whatever reason the cam shaft woud slow to a stop alot quicker then the bottom end which is balance and designed to spin the weight would keep it spinning faster and if the valaves are in the open stage it will smash those bitches up pretty good
Just confirming, it is an interference engine...currently getting a big valve upgrade kit done on my head. Ordered it, adjusted timing gear back to -10 drove fine for a day... went to leave a stop light, car just powered down. No fire, no bang, no clank clank clank.... bent three valves. Two days later the big valve upgrade kit comes in the mail. Timing?!?....pun intended